Ultimate Subwoofer Driver

Geenius · 2006-03-21 11:34 am

AndrewT said:
Hi Circlo,
Can you expand on that.

I would expect the response to be very droopy after passing below the Fb which for Q=0.19 could be way up at 50Hz.

Low Q does not suit flat response to low frequency.

You compensate it at the top-end. Due to its high 99dB efficiency, absolutly speaking you still have plenty of output level in the 20-30Hz range compared to a standard subwoofer. So instead of boosting the bass, you kill the upper end output level.

I use two of them in my living room and with some active correction I can get a -3dB point of 15Hz from a closed box with hardly any visual cone movement.

The box on the photo has another PD2150 on the opposite side to the one that can be seen.

An externally hosted image should be here but it was not working when we last tested it.

Puggie · 2006-03-21 11:54 am

I'm going with the stick it in a car solution and use the cabin gain, the rising response of 6db/oct from about 75Hz rising to 12dB/oct should prop the bottom end up nicely

it's his fault ^^^^^^^^^^^ he agreed it might work and wasn't a crazy (well not too crazy) idea!!!

cemmany · 2006-03-21 1:48 pm

Subwoofer suggestion

Hello Friends , Iam Looking for the ultimate 15" or 18" subwoofer driver. I have in mind the Aurasound NRT 18-8 and the Adireaudo tumult subwoofer 18D series . Do you guys think there are any better subwoofer drivers past the aurasound and Adireaudio.I heard that there is a company in thailand or philipines iam not sure ,which is called paudio or ps audio iam not sure about the name.I heard its good too.Can you people suggest the best driver in performance and sheer powerhandling.Iam going to construct an ultimate passive subwoofer for my speakers.I would be grateful if you gues help me out on this issue.Thanks a ton pals

Geenius · 2006-03-21 2:52 pm

Puggie said:
.....it's his fault ^^^^^^^^^^^ he agreed it might work and wasn't a crazy (well not too crazy) idea!!!

newfinish · 2006-03-21 3:35 pm

http://www.hempacoustics.com/

their coming soon with 25" excellent speakers

pneuma · 2006-03-21 4:20 pm

AJinFLA said:
Ok, the place that sells (or soon will) the "ultimate" driver (subwoofer, tweeter, you name it) is here: http://www.ologyaudio.com/

cheers,

AJ

Umm, those don't even exist yet, so how can you say that they are the ulitmate anything?

It's no problem to get excited about them, but I don't think Accuton or Fostex are going to stop making speakers just because of a link and some specs.

Boy they sure do have the hype train loaded up and rolling though.

P.

ShinOBIWAN · 2006-03-21 5:31 pm

pneuma said:
Umm, those don't even exist yet, so how can you say that they are the ulitmate anything?

It's no problem to get excited about them, but I don't think Accuton or Fostex are going to stop making speakers just because of a link and some specs.

Boy they sure do have the hype train loaded up and rolling though.

P.

I think AJ was being sarcastic.

pneuma · 2006-03-21 6:55 pm

ShinOBIWAN said:
I think AJ was being sarcastic.

In that case, color me retarded. :cannotbe:

P.

Circlomanen · 2006-03-21 7:02 pm

With a 300 liter box tuned to 15 hz I get -9 dB @ 20 hz compared to 100 hz and -12 dB total loss of efficincy compared to 200 hz and uppward. Thats easy to compensate for with roomgain and electronics.
With the PD2150 you got som power to waste if needed!

Circlomanen · 2006-03-21 7:04 pm

Geenius, thats a nice looking sub you got there!!!!

cemmany · 2006-03-21 8:35 pm

Deadly Subwoofer?

Hey Guys ,
I was looking for the ultimate subwoofer driver and i came across this driver.It is used in the wilson audio watch dog subwoofer , I dont know what brand driver it is , but it is mammoth , I have attched a picture with this message and you guys look at it and tell me what brand it is , If i can get it in the market I would surely use it in my subwoofer project which I intend to start soon.

454Casull · 2006-03-21 11:35 pm

Hey, with another 3" you can spring for the PD2450.

Then again, the Tumult is easier to work with since it's more naturally suited for sub-bass output.

ScottG · 2006-03-22 12:51 am

OK.. Now even I'm impressed! Looks like he is using the velodyne eq. preamp as well. He isn't getting quite the low freq. extension that I think should be strived for.. but I'm starting to agree with his forum name.

What I'd really like to see is THD plotted against freq.. for this driver - both at 1 watt and 100 watts. As it stands the driver could be picking a nominal freq. like 100 Hz and then getting their distortion ratings for 1 watt. (.. which is absurd for sub-bass.) Hmm, looks like distortion is at least rated at 100 watts.

454Casull · 2006-03-22 2:33 am

ScottG said:
OK.. Now even I'm impressed! Looks like he is using the velodyne eq. preamp as well. He isn't getting quite the low freq. extension that I think should be strived for.. but I'm starting to agree with his forum name.

What I'd really like to see is THD plotted against freq.. for this driver - both at 1 watt and 100 watts. As it stands the driver could be picking a nominal freq. like 100 Hz and then getting their distortion ratings for 1 watt. (.. which is absurd for sub-bass.) Hmm, looks like distortion is at least rated at 100 watts.

Which driver are you talking about?

BassAwdyO · 2006-03-22 2:53 am

asside from the double spiders it doesnt look like anything too exotic. I'd say you could get a better driver for a smaller price without any knowledge of that woofer's specs, or price. Just knowing that its in any of wilson audio's speakers is enough to know that its overpriced.

trusound · 2006-03-22 5:09 am

I have the Aura 18..IMO..the best sub I have ever owned..an I've had allot

http://pg.photos.yahoo.com/ph/randy_kunin/detail?.dir=edb7&.dnm=3342re2.jpg

ScottG · 2006-03-22 6:07 am

454Casull said:
Which driver are you talking about?

The 21 inch PD's.

I tried modeling it.. talk about absurd volume requirements - it seems to be good ONLY for the bag end design, or IB in an attic space. Of course both will need a lot of eq. but the bag end design will need a LOT more eq.. (..which will naturally increase distortion "sub"stantially.)

AudialDelta · 2006-03-22 7:36 am

Re: Ultimate Subwoofer Driver Suggestion

cemmany said:
Hello Friends , Iam Looking for the ultimate 15" or 18" subwoofer driver. Can you people suggest the best driver in performance and sheer powerhandling.Iam going to construct an ultimate passive subwoofer for my speakers. I would be grateful if you gues help me out on this issue.Thanks a ton pals

You don't really plan to use a high quality sub, and run it passive do you?

My personal favorite from the DIY market is the Adire Audio Tumult. Very clean and tons of output. It is "too clean" for the average listeners' musical "reference". The lack of distortion is associated with less output. In other words, you can turn it up a lot louder before it sounds loud. Despite what the walls, floor, ceiling, and neighbors can feel.

ScottG · 2006-03-22 8:14 am

OK.. that IS weird.

It looks like cemmany's thread was killed and "assimilated" here at the end of this thread. No wonder 454Casull was wondering what driver I was talking about..

simon5 · 2006-03-22 10:20 am

Ultimate drivers currently available...

Aurasound NRT 18-8
25 Hz Fs, 18 mm Xmax, 96 dB/W/m, 800W RMS, 0.26 Qts

Precision Devices PD2150
22 Hz Fs, 12 mm Xmax, 99 dB/W/m, 1000W RMS, 0.19 Qts

PD2450 could be a nice candidate too, but the Fs is listed at 30 Hz but resonance is listed at 25 Hz, then they don't list Xmax.

Ultimate Subwoofer Driver

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