Driver selection for compact subwoofer with LT. - Page 2 - diyAudio
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Old 20th July 2012, 01:06 PM   #11
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I did look at the Dayton's before offering up the TC. They didn't have the spec quite within the OP's requirments-though was "only" one spec out, QTS iirc
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Old 20th July 2012, 01:36 PM   #12
rho is offline rho  Belgium
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Also the RS woofers have comparable distortion figures as the Titan woofers have. (According measurements in HobbyHifi magazine)
Other drivers (Wavecor, Scanspeak, Vifa/Peerless, ...) have much lower distortion figures.
I don't have any distortion figures for the TC sounds or many other woofers, so it may not be fair to judge the Daytons against those.
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Old 20th July 2012, 05:13 PM   #13
rho is offline rho  Belgium
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I have to correct that previous statement. I was mixing up a TangBand driver with the Dayton RSS315HF-8 driver. The Dayton RS does have low distortion figures, but has very high mechanical losses (9.1kg/s for the RS compared to 3.4kg/s for the Titanic).
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Old 20th July 2012, 05:30 PM   #14
mdocod is offline mdocod  United States
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The best driver/s for the task at hand, is that with the ability to displace the most air within the box and amplification limits set. An ideal match would be something that hits Xmax in the box volume specified, when the amplifier has reached it's dynamic limits as well, or at least, try to get these 2 limits "in the same ballpark."

Picking a very low distortion driver should only go so far as if it's being compared at equal output levels to alternative "high displacement" oriented drivers. A lower displacement driver driven to it's limits will almost ALWAYS produce more distortion than a high displacement driver operating at a fraction of maximum displacement.

Qts, Vas, and Fs are actually of very little importance here. All these specifications are going to do, is change the shape of the transform required to hit your target response. The best low frequency, low distortion performance, in the case of a fixed box size and amplification, will generally come from the driver with the greatest available displacement capabilities within the limits set. As it turns out- most of the serious contenders will have "respectable" enough characteristics regardless.

Assuming the iNUKE could hit 3000W transients, the best single driver in a 2ft^3 box is probably going to be something in the class of like a TC LMS-R 15". A heavy duty long throw 15" job is, IMO, the correct approach to a 2ft^3 LT. I wouldn't even be looking at 10-12" drivers here unless they were used in pairs with this much amplification available.

At half the price, I wouldn't hesitate to suggest the Dayton TIT400C, it fits the "in the ballpark" limits here pretty good as well.

Alternatively, to really help reduce distortion, use a PAIR of drivers mounted in opposing directions inside the little sealed box. A PAIR of RSS390HO in 2ft^3, with frames coupled, would make for a great dependable LT sub with effectively dead box movement. The lower excursions required in this application would, IMO, produce a really dead nuts accurate sounding bottom end.

If the box dimensions to support 15" drivers are out of the question, there are plenty of 10-12" drivers that should be considered in multiples.

Regards,
Eric

Last edited by mdocod; 20th July 2012 at 05:35 PM.
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Old 20th July 2012, 05:37 PM   #15
Boscoe is offline Boscoe  United Kingdom
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You definition of compact is a lot different from mine! I'm contemplation an LMS R 12" in a 20l box with LT and 1500W amp!!!
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Old 21st July 2012, 06:45 AM   #16
rho is offline rho  Belgium
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@mdocod: While I do agree with most of what you say, I'm not so sure about the "only" parameter of importance being the Vd at 20Hz.
From a certain point on I would need just too much compensation @ 20Hz from the LT.
Linkwitz himself advises not to go for more then 20dB, while others say over 12db is not advisable.
Is this just an advise to prevent amplifiers from running out of juice? (which might not be a problem in my case)

With regards to the distortion measurements I was talking about: They were done using the same measurement procedure, using the same set-up, in the same conditions, by the same people. (all HobbyHifi magazine, Germany) There the TIT320C-4 has considerably more distortion in the lower octaves then the RSS315HF-8 for instance. At 50Hz the K2 for the TIT is at about 2.5% where for the RSS it is at only 0.4% (90dB at 1m). Just to give an example.

@boscoe: 20L is quite small indeed. The main reason I would not do that is the amount of extra gain you would need at F3. But I still have to find out if that really is a problem when you have ample power available.

I always look for an application where I don't need to force the performance to be what I like but get as close to my goals as possible without too much compensation.
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Old 21st July 2012, 09:36 AM   #17
rho is offline rho  Belgium
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I've looked up the shipping and extra costs from PE to Belgium. They are excessive compared to the price a sub costs. I'll have to find a sub that's readily available in Europe. I do not want to spend more then 1/2 of my budget for shipping.
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Old 21st July 2012, 10:23 AM   #18
zuki is offline zuki  United States
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do any of the jbl gt5 series woofers fit your application and are they available in your area ?
jbl gt5-10 gt5-12 gt5-15 ?

http://www.amazon.com/JBL-GT5-10D-10...ywords=gt5-10d

https://docs.google.com/viewer?a=v&q...dsfWrhp7DHivWg

https://docs.google.com/viewer?a=v&q...QlJq7Qc37eauoQ

https://docs.google.com/viewer?a=v&q...et_pqI_xuoMiqA

Last edited by zuki; 21st July 2012 at 10:28 AM.
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Old 21st July 2012, 11:18 AM   #19
rho is offline rho  Belgium
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The only one I would maybe consider is the 15".
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Old 21st July 2012, 11:40 AM   #20
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Maybe you could have a look at the D300P04 Atohm, a very versatile woofer usable for HT and Hi-Fi.

ATOHM : NOTRE BUT ULTIME ... VOUS FAIRE VIBRER

Enclosure :

http://www.atohm.com/images/kit/FICH...%20V60%20S.pdf

I own two of these sub :

Click the image to open in full size.

I made this choice has because of the size of the enclosure ~60l with an F3 of ~25 Hz (measured).
I cross them at 120hz for HC and 250 Hz for hi-fi, i use only one for HC.

Price is 180 €, HP is made in PRC, It should be available in belgium

Last edited by Pascal GUERIN; 21st July 2012 at 11:45 AM.
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