Review, ScanSpeak Discovery 30W/4558T 12" Subwoofer - Page 4 - Car Audio | DiyMobileAudio.com | Car Stereo Forum

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Old 12-02-2012   #76
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Default Re: Review, ScanSpeak Discovery 30W/4558T 12" Subwoofer

Impedance sweeps, tuning frequency is slightly affected by adding wool. Efficiency is not affected very much.

Without wool (Fb ~28Hz):



50% added wool (27Hz):



100% added wool (27Hz):


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Old 12-02-2012   #77
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Default Re: Review, ScanSpeak Discovery 30W/4558T 12" Subwoofer

Quote:
Originally Posted by Hanatsu View Post
Impedance sweeps, tuning frequency is slightly affected by adding wool. Efficiency is not affected very much.

Without wool (Fb ~28Hz):



50% added wool (27Hz):



100% added wool (27Hz):

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Old 12-03-2012   #78
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Default Re: Review, ScanSpeak Discovery 30W/4558T 12" Subwoofer

Quote:
Originally Posted by james2266 View Post
Wow, you do seem to have quite a larger peak than I do at about 40 Hz. I have a peak there but not 10db! I would say we do have some cabin gain going on there. Also, why did you put the 20 Hz cross on when looking at the response? I would think that could be why it looks like the response is tailing off. I know I noticed a difference when I had a subsonic on my Ultimo. I figured I have never heard it bottom before and it is in a sealed box so I killed the subsonic completely and am way happier for it. Just my 2c
the 50Hz peak is either cabin effect or a glitch in the RTA software / mic calibration or sound calibration. It shows up even when i am measuring the midrange / tweeters.

even though the enclosure is sealed i have been running with the subsonic on through the headunit as an HPF. It helped to tighten the sound of my JL sub and was noticeable. I also read where it conserves amp power by not using energy generated inaudible pulses- helping to divert the power to audible frequencies.

however after reading this i turned it off and it does seem to play a little deeper- I will have to measure on the RTA now to see if there is a difference, thanks.

Pioneer P99 source, JL HD and Slash amplifiers, HAT, Morel, Scan Speak and Focal drivers.
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Old 12-05-2012   #79
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Default Re: Review, ScanSpeak Discovery 30W/4558T 12" Subwoofer

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Originally Posted by Hanatsu View Post
"Subsonic" filters are not very useful in sealed enclosures.
OK, thanks for the suggestion- although the filter helped with my sealed JL sub.

But having run the ScanSpeak sub with no sub or high pass filter all I can say is WOW! It took the lid off this speaker!
The bass notes are deeper and they sustain- / linger and taper off- in a very good way.
Impact is noticeably better- especially on kick drums- which sound as life like as any system I have heard.
It literally sounds like a new (and much better) sub- and still blends incredibly well. Unbelievable.
I will definitely RTA it this week-end and post a comparison - filter / no filter.

Pioneer P99 source, JL HD and Slash amplifiers, HAT, Morel, Scan Speak and Focal drivers.
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Old 12-05-2012   #80
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Default Re: Review, ScanSpeak Discovery 30W/4558T 12" Subwoofer

"Subsonic" (weird naming that is, hence the " ") filters are basically simple highpass filters, sometimes tall order filters. The only thing they do is basically lowering amplitude on the frequencies below the set point. Depending on type of filter, rolloff might begin slightly above this frequency. As with any filter it affects phase and as a result transient response, note that this effect is practically inaudible in this case. These subsonic filters are normally used with vented enclosures and are placed like 10Hz below (Fb) to prevent unloading, since a sealed enclosure controls excursion infinitely low it's not needed. If you tune a vented enclosure in 20's or low 30's they are not needed either imo.

Here's a good read about filters:

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Old 12-05-2012   #81
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Default Re: Review, ScanSpeak Discovery 30W/4558T 12" Subwoofer

And btw, this sub has both great output and efficiency. Compared to my DLS Iridium 12i in a relatively small sealed enclosure I had to decrease overall levels by 10-15dB. They did not lie about the 25mm p-p excursion, almost no motor noise either.

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Old 03-10-2013   #82
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Default Re: Review, ScanSpeak Discovery 30W/4558T 12" Subwoofer

wow nice write upd.... i have the peerless xxls 12 in a 1.6 cubic seal... and i stuff the box of with a whole pillow case of polly....
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Old 03-10-2013   #83
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Default Re: Review, ScanSpeak Discovery 30W/4558T 12" Subwoofer

Avanti 1960 - what size is your box? and do you have any polly stuff inside the box?
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Old 03-10-2013   #84
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Default Re: Review, ScanSpeak Discovery 30W/4558T 12" Subwoofer

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Originally Posted by tru tech99 View Post
Avanti 1960 - what size is your box? and do you have any polly stuff inside the box?
tru-

My box is exactly 1.2 cu ft net including bracing and driver displacement.
I lined the walls with these excellent polyfill pads- approximately (1) lb. or so.

Amazon.com: Poly-Fil Nu-Foam Pre-Cut-14 Inch X14 Inch X2 Inch: Home & Kitchen

Pioneer P99 source, JL HD and Slash amplifiers, HAT, Morel, Scan Speak and Focal drivers.
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Old 03-11-2013   #85
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Default Re: Review, ScanSpeak Discovery 30W/4558T 12" Subwoofer

thanks you....
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Old 09-15-2013   #86
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Default Re: Review, ScanSpeak Discovery 30W/4558T 12" Subwoofer

Nice write up, thanks for taking the time to post your findings. Did you try an RTA measurement with the subsonic filter defeated?

I'm considering a replacement sub that has the low end covered, and this in a sealed or the 10" version in a ported is a contender to replace my Boston G310 in a 1.25 cuft net ported.
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Old 10-15-2013   #87
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Default Re: Review, ScanSpeak Discovery 30W/4558T 12" Subwoofer

Someone made ​​a serious comparison with the Velodyne DF12SC? Velodyne anyone ever used this power to make a brief comparison?

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Old 08-09-2017   #88
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Default Re: Review, ScanSpeak Discovery 30W/4558T 12" Subwoofer

Any updates? or test in the ported enclusure? avanti hanatsu
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Old 06-13-2018   #89
 
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Default Re: Review, ScanSpeak Discovery 30W/4558T 12" Subwoofer

Quote:
Originally Posted by avanti1960 View Post
So I'm listening to my stereo and I play my favorite old school progressive rock track, you know, Genesis? So it comes to the part where the bass organ gets really low and deep so I crank it up a little and eh? Whats up with this, ahh? Where's the bass?! Ok so I'm not going to give my sub a "bad rap?" because it does smack pretty hard when the music calls for it, it just doesn't play low or so deep. Maybe it needs more than 500 watts, I don't know but all I know is my RTA plot shows I ain't got nuthin below 60 hz or thereabouts- I ain't even got any cabin gains. So I do all this research and read all these threads about the best "SQ" 12 inch subs and all, and you people really know what's doing I can say that much. Basically I built my "box" a little larger than JL specs for a sealed enclosure but the sub models with a rather high F3 (the frequency where the output is -3db and output begins to decline by 12db every octave below that frequency). So my current sub has an F3 of 47 Hz, which seems quite high for a sub roll-off frequency- if you want deep low end bass and your vehicle exhibits minimal measured cabin gain.
So I hit the online catalogs and spec sheets looking for a 12" sub that can model with as low of an F3 as reasonably possible for the enclosure size I have and with a "Qtc" of .707 or as close as possible.
So playing lower frequencies is definitely on the priority list.
Then I starts readin about these subs that seem to "blend" and that you can't tell if its really playin, you know like transparent? Hmm, sounds a little strange but I read on... after all, my sub seems to be a bi-personality- it's either disappeared all the way or it's really there, too much "there". I would have to say this ain't your typical HQ SQ. Sos I add "blending in" and "SQ" to my list of upgrade priorities.
I starts readin about these subs that are "musical" too. Most of them are from over by europe or so it seems. Not bad. I read about this Morel Ultimo. Minga thats an expensive sub. I aint payin that much even if it is made in Italy. Then I stumble on Peerless and Scanspeak subs. Hey, I had a scanspeak tweeter and they was high line. So I plug the thiele small parameters into the spreadsheet and voila, the ScanSpeak Discovery 12" subwoofer would give me an F3 of around 37 Hz with a Qtc of .72. Ayy, I been doin lots of looking and this aint too bad. So I go with it and see what happens.

As yous can see by the attached pics this new ScanSpeak sub seems smaller than my original JL. Marone, the surround is nearly twice as big! The magnet seems a little smaller as does the install height. The frame on the Scan is nice and sturdy being a casting vs. the JL stamped sheet-metal design. Missing from the Scan subwoofer flange is any sort of sealing material (The JL sub has a nice rubberized sealing surface on the flange). I'll have to make a foam sealing gasket. The terminals on the Scan are standard variety 1/4" male connecting terminal vs. the JL spring locked terminal so I'll have to crimp some female connectors to the sub box wiring. As I'm ready to button it all up I notice the mounting holes on the new sub line up exactly with the old ones, so I am thankful for that.

So there's the pic of the sub "in-situ" if you knows what I'm sayin which means I am ready to actually hear how it sounds.
After a few errands drivin around and tuning it in it seemed very weak. Must be breakin in or something. Then I put on my old Genesis CD. Fast forward to the bass organ at the 7:00 mark of "Firth of Fifth" off the Selling England by the Pound CD (at this point you gen X, Y and Z'ers are going like WTF? right?) so ayyy, learn something ahhh? Anyway the bass organ came back to life! Not overpowering but deep and low nones the less. Then I put in a few other CDs with deep low bass and a sumthin a little familiar is goin on- oh yeah, it sounds a little like the JL sub when i had it in this big ported box the size of a small refrigerator. It was tuned to 30Hz. So the low notes are back! But the SQ so far ain't muddy or loose like the ported box sometimes sounded.

Goals of the Sub Upgrade-
1) Lower frequency output.
2) Better overall SQ.
3) More musical, less over the top.

So I'm gonna let this thing play for a few weeks and let the sub break in, tune it a little more, get some experiences with it. Then I'll do some RTA measurements and report back with some updated info and see if the upgrade goals were achieved. Off to a good start though, I can say that much.





Marone is right.
The Scan-Speak 12" drivers (aka 30W series) want to be in sealed enclosures with a volume no less than 1.3 Cubic Feet. I have a Scan Speak Silver 30W Automotive Subwoofer and spoke to Scan about recommended enclosure volumes. If you can go a little larger, do it. Driver displacement is ~.08 Cubic Feet. I line all enclosure walls with ~8mm acoustic felt and there is a sheet of MDM3 damping material in there also (synthetic polyester mixed with wool).
I will post pictures soon. If you build the enclosure correctly, without stuffing, the F3 according to most subwoofer enclosure software is ~38 Hz.
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