The Far Out Son of Lung and the Ramblings of a Mad Man
Last week I received an email asking about things I've tried that have worked, and things I've tried that were a dead end. Thought it would be fun to document that.
And, obviously, I'd be curious to find out what things have and haven't worked for you.
These are in no particular order.
Things that didn't work:
Steep crossovers
I find that steep crossovers 'ring', and that I'm particularly sensitive to this. When it comes to audio, all of use are sensitive to different things, and this is one type of 'signature' that I find particularly offensive. I generally use crossovers with a slope of 12dB to 24dB or so. It's difficult to achieve a true 6dB/octave rolloff because the drivers natural rolloff generally accelerates the slope dramatically. For this reason, if you use Linkwitz Riley crossovers on a driver, you typically end up with a rolloff on the order of 5th or 6th order. (The only time that this is NOT true is if you use a midrange and tweeter that are flat for at least one or two octaves above *and* below the xover point. For instance, if you have a tweeter with an Fb of 500hz and you cross over at 2khz. This is why Dynaudio tweeters are so big and beefy, they're designed for first-order slopes.)
Vented boxes.
If you look at the group delay of a vented box, there's a big 'spike' in the group delay which occurs at the tuning frequency. I find that this 'spike' makes the box sound sluggish and slow. You can minimize this, but I generally prefer sealed boxes, single reflex bandpass, front loaded horns and tapped horns.
dual-reflex bandpass
While I don't think these enclosures are hopeless, I find that they're very difficult to get right. I think it's telling that Bose has stopped selling them, after using them for almost twenty years, and now they're selling transmission lines. Also, Bose has a patent on dual-reflex, this is likely why you don't see a lot of them.
really small tapped horns
Theoretically, you can make a tapped horn as small as you'd like. You could even make one that was small enough to fit in your palm, if you were so inclined. As the box size gets smaller, the response will get worse. But you can offset some of that by using multiple drivers to smooth out the response. Well, theoretically anyways.
In the real world, I found that very small tapped horns simply stop behaving like a tapped horn. If you look at the impedance curve, it doesn't look like a tapped horn. Not sure if that was due to my crappy construction, or something else. But I'd argue that very small tapped horns are more trouble than they're worth. If you don't have enough space for a tapped horn, just use a sealed box. (Or if you *really* want a tapped horn, then use a woofer that's small enough so that the mouth of the horn is at least twice as large as the surface area of the driver.) Basically, be careful about making a tapped horn crazy-small, because at some point it seems to stop acting like a tapped horn.
All of that audiophile nonsense
Audiophiles seem to be wrapped up in a lot of stuff which is just completely inaudible in a car, or at least it is to me. I've never heard an expensive interconnect or speakercable which made an audible difference. I've heard some *very* subtle differences in DACs, but nothing significant enough to deal with the hassle of listening to CDs instead of an iPod, iPad or iPhone. (All of my car sources are IOS, except for my head unit.)
I am completely mystified by the forum boner for amplifiers from the 90s. My favorite amps are Tripath, not because of some magic sonic signature, but simply because they have less noise than all the Class AB amps I've tried. For a couple years I was using fairly nice gear from Zapco, but I sold it as I didn't think it was sonically superior to a plain ol' Class T amp. If anything, it was inferior, simply because the Class T amp could get louder and had less noise.
I do have *one* concession to audiophile weirdnes - I've noticed that I'm very sensitive to timing problems, and I *do* find that high-jitter sources sound offensive.
dome tweeters and ribbons
On paper, ribbons and dome tweeters have a lot of advantages. They're easy to work with, and ribbons theoretically get you 'closer to the music', since they're such simple devices.
But the distortion just makes me nuts. The output levels that you can get from a compression driver are just so amazing. YES compression drivers are a complete p.i.t.a. to work with, but the results are just head and shoulders above what you can do with a dome or a ribbon.
line arrays
Never heard a line array that did anything right, except get really loud. Imaging is huge and bloated. It's a neat audio 'trick' if you've never heard it before, but it gets tedious when everything you listen to is ten feet tall. Can't figure out why the Absolute Sound is so obsessed with them. I agree with Danley's assessment here:http://www.danleysoundlabs.com/danle...rray-paper.pdf
Underdash horns
I spent years and years and years trying to get these things to sound good, and was never successful. If you look in the classifieds here, you'll see them for sale all the time. Seems like a lot of people give 'em a try for a while, get sick of trying to tame them, and give up. IMHO, there's one big problem with underdash horns. The first is that the directivity is narrow in one axis, and wide in the other. This directivity mismatch makes it nearly impossible to find a midrange or midbass that will blend. The solution to this problem is get the midranges onto the horn, which is what I do.
Full disclosure - the only commercial underdash horns I've heard are from USD. I've owned, listened to, and measured horns from 18Sound, QSC, Geddes, and JBL. But all of those horns were not intended for the car. The QSC horns are small enough to fit in the car.
In my 25 years of working in this industry, I've listened to thousands of cars and I can count the ones that sounded great on two hands. Most of them have serious problems and some of the worst ones are IASCA winners... 50% of these guys have plans to change all the equipment in their cars because they don't sound good. In every case so far, none of the equipment has been the cause of poor performance. In every case, it's the installation, the adjustments or the system design. AW
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
Here's a list of things which *did* work. In no particular order:
Infinite Baffle Midbasses
Back in the 90s I took the wheels off of my Ford Escort, cut a hole in the car, and dropped Dynaudio midbasses in the hole. A la Earl Zausmer. (That's his car, not mine.)
This worked pretty well.
Infinite Baffle Subwoofers
If there's an easier way to get good bass in a car than infinite baffle subs, I don't know what it is. It doesn't take up a lot of space, and it gives you the luxury of using VERY high displacement woofers. It has the potential to sound better than any other subwoofer type.
IMHO, the reason that IB subs sound so good is because of group delay. If you look at the group delay curve of a subwoofer, you'll see that it gets very high at resonance. For instance, if you put a 12" sub with an FS of 25hz into a sealed box, the resonance will get bumped up to 40 or 50hz. And at that frequency, the group delay will be very high, much higher than it is an octave above or below resonance.
Why is this important? Because it can make the bass sound sluggish or slow.
In an infinite baffle, there is still a resonance, but it is much lower. For instance, instead of taking a 10" woofer with an FS of 25hz and sticking it in a sealed box where the FB goes to 40hz, we're taking a 15" woofer with an FS of 18hz and sticking it in an infinite baffle, where it might go to 20 or 22hz. Due to the very large box size, the FB is lower in frequency, where it's less audible. In fact, considering that there's very little music content below 30hz, the group delay may be damn near inaudible.
Unity horns on the dash
While they were ugly as sin, my Unity horns on the dash were probably the best sounding system I've every done. Unity horns do a bunch of things right, that other speakers do not. Intelligibility, articulation, the ability to take a magnifying glass to a recording. They're the only speakers I've ever heard which can come pretty close to making it sound like you're not listening to speakers in car. (Basically, on the right recording, it's almost like the whole dash disappears.)
If you've followed some of my threads, you'll notice that I've been utterly obsessed with getting these scaled down to a point where they can work in a car.
Unity horns are not perfect, but the main problem with them is making them small enough so that the car is still drivable. It's hard to get them to mate to a midbass because there's a real audible transition from midrange to midbass, which is the whole reason I obsess about getting them to play as much bandwidth as I can.
Also, if you use midranges or midbasses which are too large, the sound starts to get pretty rough. But this is a problem common to any horn. If the horn is too small, it doesn't sound good. (A horn is an impedance transformer. This is why I tend to use very small drivers with very light cones. The smaller and lighter the cone is, the smoother the response when the horn is too small.)
Homster Horn
I was floored by how much better the USD horns sounded when you add a roundover and reticulated foam. Night and day difference, and easy to implement. Measured results confirm that it's better.
On the downside, you still have the directivity problem that's common to all underdash horns IMHO, so that's why I'm not running underdash horns
Paralines
IMHO, the single most exciting thing I've seen in audio in years. Paralines solve so many problems in audio it's ridiculous. Paralines offer many of the benefits of underdash horns, but in a package that's 1.25" deep instead of six or eight inches deep.
tweeters really close together
This project was really a trip. It's documented in the thread titled 'anyone tried using one tweeter?'
Basically, this project was inspired by a masters project from a student in Florida. The student found that you can potentially use a mono tweeter at high frequency, instead of dual stereo tweeters. The reason that this (may) be possible is because our perception of location at high frequency is dictated by intensity. In other words, if your left and right speakers don't match 100%, high frequency sounds will NOT be centered. But the odd thing is that the actual location of the tweeters doesn't matter all that much, as long as they're at the right height! (Strange but true.)
It's a really strange project, one of those 'you wouldn't believe this unless you heard it' projects. But it really got me to re-assess how we hear things, and it had me screwing around with OPSODIS and ambiophonics for quite a while there.
In fact, I'd argue that the best soundstage I've ever heard was with an ambio setup.
The main reason that I ditched the ambio setup is that it only sounds good if you're seated right in front of the speakers, and in the car, that's impossible. (Unless you put both speakers on the drivers side, which I considered.)
Phase-coherent crossovers
Yes, I know there's an argument that phase is not audible. Perhaps I'm just very sensitive to it. But I also find it interesting that phase-coherent speakers from companies like Dynaudio, Vanderstien, and Quad have become classics. Coincidence? I don't think so.
In my 25 years of working in this industry, I've listened to thousands of cars and I can count the ones that sounded great on two hands. Most of them have serious problems and some of the worst ones are IASCA winners... 50% of these guys have plans to change all the equipment in their cars because they don't sound good. In every case so far, none of the equipment has been the cause of poor performance. In every case, it's the installation, the adjustments or the system design. AW
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
Man, do I agree with you about the "audiophile nonsense." Which is why I love the Audio Myths subforum here, where objective, educated discussions overrule the subjective placebo results, with people's personal prejudices coloring their results. You haven't heard an audible difference with interconnects because for the most part, there are no audible differences between interconnects, haha. With home audio, you'll see scrubs that pay $200 for a powercable and swear up and down that it did something to the sound quality. But then, they don't have an answer when you open up their wall and show them the cabling that the electricity took from the street to the wall outlet, or the power lines from the plant to their house. Whoops.
I definitely agree that sound quality is about equal between all the various headunits (Pioneer, Sony, Alpine, Kenwood/JVC, Clarion, etc). The difference is tuning options (number of EQ bands, HPF/LPF, etc) and convenience options (Bluetooth, HD radio, USB control, etc). Different companies may have different base EQ curves on the headunits, but overall quality is about equal. Heck, it's about equal between the lowest and highest model of a specific company's line!
I'll add overpowering speakers to the list as well. People are worried about headroom (nonsense), and providing enough power to a speaker, without realizing that when you don't have the volume cranked, you're really not sending that much power out! I always challenge people to go stick a digital multimeter or oscilloscope on their speaker leads when listening at normal volumes to their home audio or car audio setups, just to see how little wattage they are actually using at realistic listening levels. As long as you're not running into audible distortion, I don't see why people are over-building their car setups.
Also, I never got that nonsense about amps from the 90's either. I think at some point, people got into their heads that an amp making more than rated power was the primary consideration of whether an amp was good or not. So if there were two amps that were about the same spec-wise, down to even the price, but one was rated at 90Wx2 and another was rated at 60Wx2, even though they both provided the same power people would be ga-ga'ing over the 60Wx2 amp as if it were the second coming of Christ.
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
Quote:
Originally Posted by asawendo
Subscribed, since I want to know the result with line arrays project just to fulfill my curiousity. Heh heh heh
And Patrick why don't you mentioned about your tweeter spheres project? I've got great result with that enclosures. Thx you.
I never tried it myself!
The idea came from listening to my Gedlee Summas day in and day out for months, and being a bit mystified that such a large speaker could 'disappear.' I think the waveguide is part of it, but I have a hunch that the enclosure is playing a larger part. I've heard speakers with excellent waveguides that have square edges, and they just don't image the same way.
As you can see in the pic above, these are BIG speakers. That's a 55" TV that the Summas are sitting next to, and the Summa dwarfs it. Also, the reason why it looks like such a mess is that I took this pic while I was building the tapped horn that's there in the background. I had to build the sub *inside* of my house because it was too large to fit through the door.
In my 25 years of working in this industry, I've listened to thousands of cars and I can count the ones that sounded great on two hands. Most of them have serious problems and some of the worst ones are IASCA winners... 50% of these guys have plans to change all the equipment in their cars because they don't sound good. In every case so far, none of the equipment has been the cause of poor performance. In every case, it's the installation, the adjustments or the system design. AW
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
So -
What have you guys tried that worked well? And what *didn't* work?
In my 25 years of working in this industry, I've listened to thousands of cars and I can count the ones that sounded great on two hands. Most of them have serious problems and some of the worst ones are IASCA winners... 50% of these guys have plans to change all the equipment in their cars because they don't sound good. In every case so far, none of the equipment has been the cause of poor performance. In every case, it's the installation, the adjustments or the system design. AW
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
Didn't work well:
Rebuilding the dash in my old car.
Inefficient speakers
Resistive Damped Operation for the subs.
Worked well:
Aura Whispers...yeah I know what I said above, but I do love those little guys
Logic 7 with a big center and good surrounds.
Digital only output from my deck. What a PITA that was.
Horns and unity style horns.
Amps with no or little crossover distortion on high efficiency mids/highs.
Foam in the horns.
Potential to work well, didn't mess with enough:
Rear midbasses. Promising initial trials.
Unity horns. Larger horns with more mids would have given better output. May try again.
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
My "what worked well" is boring; it's just a list of solid advice you'd give to a beginner. I'd liken it to something like the Atkins fad: you can have a bunch of Harvard and Stanford educated nutritionists just giving good information about eating well, and you'd never hear their names. Then someone like Atkins comes along and says something outlandish like "cut out carbs," and he becomes a household name. So, I'm just going to happily live in obscurity with my "boring" enhancements that have worked well for me and are honestly the basis for good sound (big proponent of "Keep it simple, stupid"): enlarging the speaker holes in the doors to fit a larger transducer, kick panel speakers, components with the tweeters mounted in the A-pillars or upper door panels, etc. There's no magic about reproducing sound; it's just well-understood basic science. I lead a pretty happily boring life over here :P
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
I had tweeters in spheres mounted roughly 3/4" off the A-pillars. For the first time my tweeters had virtually disappeared even though they were in front of my eyes. It was great while they lasted.
I moved on to 2" widebanders on the dash with no tweeters. I'm loving that even more, although I wish the stage width and depth was greater.
6.5" subwoofers in the front doors is working well, although it took a lot of acoustic treatments to get that to "wow" me. I learned a lot about sound deadening from that project.
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
What has worked-
Midbass mounted/cut into the floor
Kick panels worked great in Cars
Midrange and Tweeter more off-axis in more like rounded/sphere enclosures works well
Tweeters in sail panels actually worked better in many areas than in the A-Pillars
Rear fill actually worked, however still debating the outcome vs. cost, time, tuning
IB worked so well that anytime I can do IB that is what I do to include midbass drivers
What did not work well-
Kick panels in a truck and SUV
Midbass in the doors, tried this in cars, trucks and SUVs
A-pillars midrange and tweeter on-axis, was just never a fan and could never get it to sound correct, sitting anywhere near the passenger seat was basically unlistenable when trying to tune for driver.
Truck cut through with sealed sub enclosure, never got it to sound right
Center console sub in the truck, never got this to sound right
large Trucks and SUV's are a huge pain the ass to get sound right vs. a car. It can be done but it takes a lot of modifications to get there.
I have gotten both 2-way and 3-way to work very good. However I cannot say that a 3-way is far superior to just a 2-way. It is much harder to tune and IMO I can accomplish 95-97% and maybe 1% better with a 3-way.
Things in future to try-
Point Source driver set-up
AP enclosure in my own vehicle
AMT Tweeters in a vehicle
06 F250:Zapco-JL-Pioneer, 99 Prelude:JL-DBX-Pioneer, 02 Honda Civic: 80PRS-Hertz-IDQ-JL, 08 Focus: Kenwood-Hertz-IDQ-Zapco, 05 Dodge1500: Kenwood- Pioneer-ID-Zapco---Team JL, Team MSE, Team RAAMmat, Team Zapco---2009 USACi Basic WC, INAC 2nd, 2010 MECA Finals 4th MODEX, 2010/11 OK State Champ MODEX
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
I used to do alot of off the wall stuff to try to make it sound good:
What didn't work:
Putting tweeters in the side window defrost ductwork. Sounded horrible. I was experimenting with widening the soundstage.
Adjusting the crossovers to overlap to keep the "dip" out. Phase issues out the butt.
Using a Rockford Fosgate Symmetry. Nice unit, but it had a very high noise floor that I couldn't get to go away no matter how hard I tried. I put alot of time into the install of this and even put the control head flush mounted in my driver's side sun visor. I went back to the Audio Control EQTs.
Mounting tweeters on the rear view mirror facing the windshield. Made my soundstage sound like it was shaped like a backward W.
What did work:
Install a 4" midrange in my center air conditioning duct firing up. I powered this off of a Audio Control center channel processor with a built in amp. It was very stealthy and could be adjusted by just turning the control knob.
Putting 6 1/2" mid basses in the rear deck. I played with adjusting the sound with resistors to lower the volume a bit and passive low pass crossovers to keep it under 200 Hz. They were ran off the same 2 channel amp that the front mid-basses were powered by. The sealed sub enclosure was sealed off from the trunk to keep the mid-basses happy.
Some of the brightest people in the world are Bi-Polar. It doesn't seem to work with me.........
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
Things that work for me... Vented enclosures... well.... purpose built ones. The Group delay does not bug me as much when tuned low.
Minimalistic EQ, I'm not against EQ, I'm against going batshit crazy with it.. It makes the phase response go to shit and this "I believe" is the fastest way to get a system to sound lifeless with no sense of cohesion.
Using the crossover AS an EQ. Instead of crossing at 2.5 K with both drivers then finding out you have a spike there, then cutting it with EQ. Do your attenuation with the crossover by avoiding it a bit.
Crossing the sub higher than most, it's really a no-brainer that most car audio guys don't understand because they run tiny enclosures and a low crossover which is nothing more than a crude Linkwitz alignment.
Therefore, enclosures that look good anechoic while ignoring "transfer function." I can EQ that shit out if I want, or, novel concept, turn the sub down. What most gain in "headroom" by quadrupling power I can achieve the same with a 6dB more efficient enclosure design. Read, less power compression and less sag on my electrical system.
Measurement based time alignment. I don't care who you are, period, you cannot see bacteria with reading glasses. You can get close, but by that time you can smell it too.
Taking my time and thinking something though, especially being older/experienced and having the realization that what seems like a great idea now is not going to be a good idea in a week.. Put the saw, or knife, or epoxy down.
What has not worked.. Things in kickpanels, ever. Before DSP it was a great way to get path-lengths equal, unfortunately any part of my body from the head down does not have ears, especially my knees and ankles. It never ever works for me, not even in cars where people say it works for them. I would, however, try dedicated midbasses or subs in the kicks someday, I do like that idea.
My most thought out mistake.... The first idea with the civic, knowing that the driver's side tweet was off axis by a predictable amount was to purchase a tweeter with a predictable and easily corrected off-axis response. So I did that, and corrected for it. What dipshit Chad forgot to account for was the early reflection OFF OF THE SPEEDO CLUSTER HUMP then off the window and into my left ear, subsequently making everything in my left eye a bit more vivid in color. That was "I shoulda had a V8 moment."
I tried an isobaric enclosure when I was way way younger.. all the bass half the space right? Huge failure.
Asking my wife for advice... Total buzzkill. We no longer ask each other advice about each other's hobbies... EVER.
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
Quote:
Originally Posted by asawendo
Worked well
Tweeter in spheres
I thought the whole point of using spheres was to eliminate/reduce diffraction. Seems to me as though the grill used in the pic above would basically undo everything the sphere was supposed to accomplish.
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
Didn't work:
-Large midbases in doors : Problem is the door isn't big enough for them to act as if they were really IB and didn't sound as good. Also midbase didn't get any better, they only were better at playing base and rattling. Moving my SLS8's from doors to a read deck IB really highlighted the difference. IB in the trunk, the midbase was phenominal compared to in smaller doors.
-having midrange and tweeters on the dash on axis.
-small sealed enclosured (dash pods, kick pannels) for relativly big speakers (6 1\2). Sound always comes out strange and unatural. .
What does work
Surround sound (Logic 7) with a center speaker: sounds good from all seats. Midbase and impact comes from up front without crossing over low.
Smaller door mounted drivers not crossed over to low.
subwoofer crossed close to higher... (80 to 100hz).
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
Quote:
Originally Posted by Niebur3
I thought the whole point of using spheres was to eliminate/reduce diffraction. Seems to me as though the grill used in the pic above would basically undo everything the sphere was supposed to accomplish.
And the lip, you want the sphere basically behind the driver so there is literally no baffle at all.
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
Quote:
Originally Posted by Niebur3
I thought the whole point of using spheres was to eliminate/reduce diffraction. Seems to me as though the grill used in the pic above would basically undo everything the sphere was supposed to accomplish.
Heh heh all right all right... I put the grill just for temporary protection ( since I have a naughty son)
What hasn't worked for me:
- small cars. Seriously (: i would buy the biggest vehicle that I could if all I cared about was SQ. It will make so many problems go away. Large enclosures, amp mounting locations, getting "dry" bass with no standing waves or room modes... Less reflections, bigger dash, etc.. I could go on
- every off-the shelf DSP and aftermarket head unit that I've tried (mostly for non-SQ reasons)
- expecting that an "auto tune" would be an easy way to make my car sound great
- three-way active has been a big PITA, barely worth it in the end.
Seems to have worked for me:
- Low inductance speakers with lots of power handling
- ring radiators
- Logic 7 and other phase steering techniques. Not a freebie, still needs lots of tuning to get the speakers to disappear. Still haven't found one that I'm 100% happy with, which really tempts me to write one myself that does exactly what I want.
2011 MINI Cooper S :: [build log] :: [new CarPC project]
HAT L6SE, L3SE, L1 Pro R2. 4x Alpine SWR-843D, 2x JL XD700/5, 2x XD500/3, Alpine H800, RUXC800, Mac Mini CarPC
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
Most of mine are dupes of others, so posting mostly for "+1" tally...
What worked:
- IB 15" sub in back. I will IB every time I get a chance now.
- Running the sub higher than ~90% of other people. Comeon guys, use that cone area where you have it.
- Dayton 10HO ported. I've had other ported boxes that were OK, but this one rocked socks. Played high, played low, tons of free output.
- 2" Peerless drivers in tennis balls on the dash. Ugly and got me made fun of by everyone I knew, but that was the best sounding and most realistic front-stage I've had to date. Working on building a less-ugly version for my current vehicle.
- Augmented Wideband For Life - until I start whining about high-volume dynamics, or the Paraline work convinces me to get crazy, I will continue listening to music at Reasonable Listening Levels from the closest thing to point-source I have ever used.
What didn't work:
- Tweeters low in the door - never again will I be so crippled by "packaging concerns"
- tweet or midrange in the the door sail/mirror panel - I have yet to see a result that was not improved my moving the speaker somewhere else.
- "tweeters really close together" - I built the baffle and roundovers and everything, but could never get it to mate tightly-enough with the dash to make it coherent. Gave up on it after a couple hours of work. Had some promise though, and is the easiest way to package a front-stage, so I might try it more thoroughly at some point.
Quote:
Originally Posted by RNBRAD
...if you have dual climate control, that would be more likely to cause a timing issue ... Sound travels faster through warmer air so lets make sure both zones are the same temperature. lol
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
Quote:
Originally Posted by 94VG30DE
- 2" Peerless drivers in tennis balls on the dash. Ugly and got me made fun of by everyone I knew, but that was the best sounding and most realistic front-stage I've had to date. Working on building a less-ugly version for my current vehicle.
It's funny that this driver came up again. You'll notice it pops up a lot in my projects. I am generally fairly practical about driver selection, and typically just buy the driver with the right set of parameters. But that Peerless is on my short list of maybe four or five drivers that just sound good no matter what you throw at it.
For instance, in my current Paraline project I am using the 2" midranges from Gento, the same ones that Bill Waslo is using. And literally *seconds* after I hooked it up, I said to myself "the Peerless sounds better."
I'm really a bit stumped by this. It's not like the Peerless measures all that different. But I could pick it out in a second in an A/B comparison.
My hunch - and this is only a hunch - is that paper coned woofers have some type of breakup which is readily recognizable.
Also, the Aura Whispers sound virtually identical to me. I use the Peerless mostly because the Whispers seem so fragile.
Another driver that I put in that 'will sound good no matter what' category is the Dayton dome midrange, the one that's made by Peerless.
If I'm not mistaken, all three of these drivers are underhung designs, with aluminum cones, so perhaps there's something to that combination that's viable.
In my 25 years of working in this industry, I've listened to thousands of cars and I can count the ones that sounded great on two hands. Most of them have serious problems and some of the worst ones are IASCA winners... 50% of these guys have plans to change all the equipment in their cars because they don't sound good. In every case so far, none of the equipment has been the cause of poor performance. In every case, it's the installation, the adjustments or the system design. AW
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
Quote:
Originally Posted by Neil_J
What hasn't worked for me:
- small cars. Seriously (: i would buy the biggest vehicle that I could if all I cared about was SQ. It will make so many problems go away. Large enclosures, amp mounting locations, getting "dry" bass with no standing waves or room modes... Less reflections, bigger dash, etc.. I could go on
May wanna re-think that.
Especially given the wavelengths we are talking.
What works for you works, but that's not the reason because a smaller car is LESS susceptible to a "standing wave" or wavefront cancellation in the lower octaves.
What works for you works, but that's not the reason because a smaller car is LESS susceptible to a "standing wave" or wavefront cancellation in the lower octaves.
Maybe bad choice of words, I think there can be such a thing as too much cabin gain in small cars. Doesn't sound very natural, not "dry" as myself or others have put it. I'm not a guru or an acoustics engineer, just my $0.02.
2011 MINI Cooper S :: [build log] :: [new CarPC project]
HAT L6SE, L3SE, L1 Pro R2. 4x Alpine SWR-843D, 2x JL XD700/5, 2x XD500/3, Alpine H800, RUXC800, Mac Mini CarPC
Re: The Far Out Son of Lung and the Ramblings of a Mad Man
Quote:
Originally Posted by Neil_J
Maybe bad choice of words, I think there can be such a thing as too much cabin gain in small cars. Doesn't sound very natural, not "dry" as myself or others have put it. I'm not a guru or an acoustics engineer, just my $0.02.
Totally agree, watching the transient response on mine was /is wild. When I first used SMAART it said my sub was 40 feet away. What was happening is that it was taking around 40mS for the car to "light up" and develop. This could be seen using accelerometers on the body panels.
There's ways around it, not easy, but if you take your time I find that you can get by with using MUCH LESS power than usual. So I find small cars as an advantage... But damn you will play hell with it till you really wrap your brain around it.