You are not mistaken. I was just wondering what would be the most likely to cut any chance of port noise.... I have never used 2" ports and the thought scares me a little but I have seen it recommended in this situation (8s). I have never had port noise in any box I have ever made but I know it exists and since I "try" not to make a ton of boxes I just want it done right.
Oh you got jokes...lol I know that but all The places I went to didn't even know that they had shipped. God I miss Chicago audio shops.
I don't have visibility into local dealer stock, but I know we have them in stock in our warehouse so any authorized dealer could get them for you within a week.
Hope that helps.
Jim
if you do this. it'll help you. some sunny day ...
I am wanting to replace the sub box I have in the rear cargo area of my Mazdaspeed3 hatch with a more stealth sub install... inside the spare tire under the cargo floor (where Mazda puts the stock Bose sub).
It just so happens that a .3 cu.ft. sealed box is what will fit and it will be powered by 350 class D watts so this little 8 seems like a good fit.
I listen to prog. rock, classic rock, metal, etc. and am not really an SPL guy but more SQ and like tight, musical bass rather than boom.
My question is do you think a single one of these subs will do much for me considering it's in a sealed box and under the floor like that?
Someone already asked about IB and I believe the answer was no.
Actually, the answer was a qualified yes. If I recall correctly, Jim recommended wiring only one coil to raise the Qts from a slightly "dry" .5 (or thereabouts) that wiring both would produce in an IB app.
Anyway...I'm going to try one in the same configuration (IB in the rear deck) before I decide if I want an enclosure in the cabin.
Actually, the answer was a qualified yes. If I recall correctly, Jim recommended wiring only one coil to raise the Qts from a slightly "dry" .5 (or thereabouts) that wiring both would produce in an IB app.
Anyway...I'm going to try one in the same configuration (IB in the rear deck) before I decide if I want an enclosure in the cabin.
I think this would work well considering that the higher q of a single coil driven, would coincide with the lower power requirements to reach Xmax when unloaded by a box.
2 of them should be pretty decent, considering that you still have that awesome stroke capability, and with 300 watts per speaker, one-coil-driven, 600 watts into it would allow full excursion limits along with the bump in bass at resonance of the higher qts.
Thanks for the input guys
These 8" Type-R's seem very interesting to try in IB, especially with the high Xmax and the decent Qts specs.
For IB, wiring only one voicecoil seems to be the route to go. If I understand correctly, the Qts should pretty much double, putting it well above the general requirement for IB of 0.7 Qts.
The only concern is the lowered power handling. Using only one voicecoil splits it in half so each woofer would only handle ~175w RMS.
Seems sort of a waste for such a beefy subwoofer! But if it has good bass output and good SQ, then I'm game
Anymore opinions on this?
Has anyone tried it in IB yet?
Actually, the answer was a qualified yes. If I recall correctly, Jim recommended wiring only one coil to raise the Qts from a slightly "dry" .5 (or thereabouts) that wiring both would produce in an IB app.
Anyway...I'm going to try one in the same configuration (IB in the rear deck) before I decide if I want an enclosure in the cabin.
Accursed memory! Thanks for clearing that up. I hate spouting misinformation.
--------I don't know why I can't share links in my posts (this is my seventh), so please substitute the -DOT- appropriately if you want to access my links.--------
For those wanting to know more about these subwoofers, here are some links to camera phone quality photographs of the dimensional measurements, 'Enclosure Information' and 'Electro-Mechanical Parameters' from the seemingly elusive SWR-823D/SWR-843D manual:
So after an hour of feeding these drivers 20-40 Hz sine waves set at ~30 volts...I saw the mechanical capabilities, heard the resonances, felt the vibrations, and smelled the fresh voicecoils heating up...I basically fiddled and poked around these things and noticed nothing out of whack, which is good. In order to get an idea of what these things were designed to do, I dropped them in my 0.5 cubic foot tester box and just listened. I thought it was fitting to play songs that contained lyrics like "Then I let the Alpine play" and "The Alpine bumpin' but I need the volume higher" so I did just that. In addition, I also played a wide collection of songs with varying bass content. It seems like these Alpines haven't really opened up yet and aren't digging that deep. I guess I'll have to give them a few more days of break-in time to let the suspension ease a bit more, then decide on enclosure options from there. From my few hours of listening experience with these subwoofers...I can protest that these put out much more midbass and can take quite a bit more beating that my JBLs. Kick drums are much more impactful than the JBLs, but these don't seem to get as low as the JBLs. A bit more output, but not as low. Perhaps this is an indication that these might need a bigger box to suit my preference?
For me, the 'best case scenario' would be to enclose them in a sealed and stuffed 0.4 cubic foot box built for the front passenger footwell. With this setup, I'm hoping to utilize my firewall, cabin floor, and windshield to get a much more efficient transfer function (and front-staged bass) than what my trunk can provide.
The 'worst case scenario' would be to enclose them in a ported 1.4 cubic feet box (tuned to 32~36 Hz) and place it in the trunk and let them bellow and breathe. I just know that they'll waste a lot of valuable energy rattling a bunch of flimsy panels.
I'm hoping that these Alpines will flex and open up over the next few days so that I can proceed with my 'best case scenario' option.
Last edited by schmiddr2; 07-27-2011 at 10:09 AM..
Thanks for the input guys
These 8" Type-R's seem very interesting to try in IB, especially with the high Xmax and the decent Qts specs.
For IB, wiring only one voicecoil seems to be the route to go. If I understand correctly, the Qts should pretty much double, putting it well above the general requirement for IB of 0.7 Qts.
The only concern is the lowered power handling. Using only one voicecoil splits it in half so each woofer would only handle ~175w RMS.
Seems sort of a waste for such a beefy subwoofer! But if it has good bass output and good SQ, then I'm game
Anymore opinions on this?
Has anyone tried it in IB yet?
IB requires lowered power inputs on really any small sub, due to the unloaded suspension.
Do you know what these things will look like in a rear deck traveling over 1.5" of peak to peak?
according to jim, these subs can take it in stride, but your car's rear deck may not!
I wouldn't worry about the thermal rating of just one sub coil in operation as much as I would worry about providing a good foundation to mount these in, because they are likely going to do to a stock rear deck what you hear others complain an 8" does to a door, and that's not good!
I wouldn't hesitate to power a pair of these 8" subs with an old school PPI A600.2, even if using just the one coil on each in IB mounting.
Of course, I'm not one to blow up subs either, so...
Application question:
I am wanting to replace the sub box I have in the rear cargo area of my Mazdaspeed3 hatch with a more stealth sub install... inside the spare tire under the cargo floor (where Mazda puts the stock Bose sub).
It just so happens that a .3 cu.ft. sealed box is what will fit and it will be powered by 350 class D watts so this little 8 seems like a good fit.
I listen to prog. rock, classic rock, metal, etc. and am not really an SPL guy but more SQ and like tight, musical bass rather than boom.
My question is do you think a single one of these subs will do much for me considering it's in a sealed box and under the floor like that?
Opinions?
Having never heard your car's OEM system....nor having never heard the SWR, I can say from the specs alone that the SWR will out perform your stock setup...and a small hatch is a perfect vehicle for a single 8". The boost off the hatch is nice and a single won't resonate the panels as much....also you don't have a wall to play through as with a sedan.
I don't know that I would fart around with the BLOSE enclosure? Either do a custom fiberglass job in the spare tire location....or do one in the drivers side pocket with an 8" or 10".
Having never heard your car's OEM system....nor having never heard the SWR, I can say from the specs alone that the SWR will out perform your stock setup...and a small hatch is a perfect vehicle for a single 8". The boost off the hatch is nice and a single won't resonate the panels as much....also you don't have a wall to play through as with a sedan.
I don't know that I would fart around with the BLOSE enclosure? Either do a custom fiberglass job in the spare tire location....or do one in the drivers side pocket with an 8" or 10".
Thanks for the input.
I am definitely not doing anything with the Bose "sub"... I just meant my custom enclosure will sit in the same location as the Bose unit... inside the spare tire. A simple MDF & fiberglass cylinder should be really easy.
I think I'll give it a try, now I know I've asked in this thread several times, but someone MUST know the driver displacement on this sub?
now I know I've asked in this thread several times, but someone MUST know the driver displacement on this sub?
I am sure Jim from Alpine can chime in but he pretty much stated that the sub will wok in a pretty small box.
Quote:
Originally Posted by jim walter
Small Box Requirements: In the CES Demo Camaro, we’ve got them in a plate steel enclosure roughly the size of the woofer’s magnet (0.1-0.2 cubes). For a QTC of 0.90, try a quarter cube. Essentially, they work in boxes smaller than the shipping container they come it.
So,.30 cu ft would be perfect if you have the space....if not no need to fret over driver displacement unless you are seriously cramped for space.
... but someone MUST know the driver displacement on this sub?
Check out my 'Enclosure Information' link above. These drivers displace or add 0.05 ft3 or 0.035 ft3, respectively, if mounted to a 3/4 inch thick baffle.
Jim how power did you guys put on the pair in the camaro being used as midbass drivers? I'm asking cause I'm ready to get a pair and trying figure out which Hertz amp to get. The hp2 puts out 700×2 @ 2 ohms rms vs a ep4 which is 340×2 bridged rms @ 4 ohms. See my problem, I need to figure out which amp so I can order either the 4 or 2 ohm.
Pioneer premier prs800, peerless 830986, 2 spg555 subs. About to prove a point with low budget amps...no forum boner wither...
Check out my 'Enclosure Information' link above. These drivers displace or add 0.05 ft3 or 0.035 ft3, respectively, if mounted to a 3/4 inch thick baffle.
I somehow missed your post. That is exactly what I needed.
It appears that the net enclosure volume should be .25 cu.ft. which makes a difference in my application.
THANK YOU!
Last edited by Ganderson; 06-14-2011 at 01:43 PM..
Re: Alpine SWR-823D / 843D 8" Subwoofers
Re: Alpine SWR-823D / 843D 8" Subwoofers
Linear Mode
