suitable woofers for 175L reflex enclosures - diyAudio
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Old 9th July 2014, 11:24 PM   #1
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Default suitable woofers for 175L reflex enclosures

Hi, can somebody tell me is there a suitable efficient 90+dB 12in woofer (pref non foam susp) that will handle 100W rms that will work well in 175 liter reflex enclosures. I like the look of the JBL123a's & the JBL2213h's for their build but not sure of suitability. I'm running a 75Wrms tube amp. My knowledge of enclosures goes as far as basic concept so your help would be gratefully appreciated.
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Old 10th July 2014, 03:57 AM   #2
GM is offline GM  United States
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Both ideally require much larger vented cabs. To the first approximation and regardless of Fs, if Qts = ~0.4, then box net volume [Vb] = driver compliance [Vas]. If Qts is <0.4, then net Vb is ideally smaller and vice versa and why both these JBLs are ill suited for 175 L unless sealed.

Note that your tube amp's output impedance [series resistance] will effectively increase the driver's Qts, so do you know it or its damping factor?

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Old 10th July 2014, 05:40 AM   #3
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This would be a nice driver if you could find it.
MAX SPEAKER PV-1250 8
Home Page
Many drivers are discontinued.
Visaton W300S - 8 Ohm W 300 S - 8 Ohm
SEAS 33F-WB/WK http://www.seas.no/images/stories/vi...-wb_and_dd.pdf
SEAS Kit 503
Audax HIF30H SMC http://www.audax.com/archives/HIF%20...gue%201982.pdf
NHT/MAD1259 http://www.madisound.com/pdf/MAD1259.pdf
http://www.kenkantor.com/press_clipp...HT1259_FAQ.pdf

Better going the old 15" route.
Dayton Audio ST385-8 15" Series II Woofer
Beyma 15LX60 http://www.beyma.de/fileadmin/seiten...nal/15LX60.pdf
STEREO INTEGRITY HT 15
AE TD15H
JBL 2235H
Eminence Kappa-15LFA pdf
Eminence Kappa-15LFA 15" Low Frequency Driver 8 Ohm
Fane Sovereign Pro 15-600 LF pdf
Fane Sovereign Pro 15-600 LF - Thomann UK
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Old 10th July 2014, 05:54 AM   #4
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SB ACOUSTICS SB42FHC75-6 pdf
Faital Pro 15FH520
GPA 515-8C pdf

edit: You also have 12"s for reflex ScanSpeak 30W/4558T00 and 32W/4878T00
Actually you will be amazed with the SS 30W/4558T00 in a sealed speaker (VB = 175.0 L, QTC = 0.5, 91 dB/2.83V/m). Check low driver Re for amp.

Last edited by Inductor; 10th July 2014 at 06:12 AM.
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Old 10th July 2014, 06:14 AM   #5
Zvu is offline Zvu  Serbia
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Eminence Deltalite II 2512. I had it for a long time. It's a great driver and requires something about 120 liters.

Why are you searching bass that can operate in 175 liters ? Do you already have cabinets of that volume ?

Since you are from Australia, if ordering from USA or Europe doesn't make a difference i would suggest Sonido SCW300 12" bass.

http://www.sonido.hu/adat_pdf/scw-300.pdf

http://www.sonido.hu/index2.php?lang=en

I had it for 2 years and it sounded great. I would never got rid of it if i wasn't going from 12" to 15" bass. Great sound and good frequency response up to about 2.2KHz where it has breakup. They need at least 140 liters to work properly.

Here are pictures of mine when i got them

http://i50.tinypic.com/24wwlxv.jpg

http://i50.tinypic.com/350vy9g.jpg

http://i45.tinypic.com/rmlifs.jpg

http://i49.tinypic.com/2ah60ki.jpg

http://oi42.tinypic.com/2cyo2n4.jpg

The last picture is TS parameters. They are hand made by Mr Varga from Hungary.
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Last edited by Zvu; 10th July 2014 at 06:29 AM.
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Old 10th July 2014, 07:50 AM   #6
Zvu is offline Zvu  Serbia
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Here they are in process of xover tweaking. Birds nest xover really

Click the image to open in full size.

Click the image to open in full size.
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Old 10th July 2014, 08:25 AM   #7
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Quote:
Originally Posted by Zvu View Post
if ordering from USA or Europe doesn't make a difference i would suggest Sonido SCW300 12" bass.
Nice post.
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Old 10th July 2014, 12:29 PM   #8
OllBoll is offline OllBoll  Sweden
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I'd say invest in a DSP then get whatever woofers you want with whatever box you want. If you get a MiniSHARC / OpenDRC and you can even fix the 3rd order low frequency roll off caused by the ported box and turn the speaker into a linear phase one which is awesome.

You don't have to multiamp, it can stay being a hybrid setup. The phase corrective FIR is also common on the whole channel.
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Old 10th July 2014, 12:58 PM   #9
IG81 is offline IG81  Canada
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Quote:
Originally Posted by cone head View Post
Hi, can somebody tell me is there a suitable efficient 90+dB 12in woofer (pref non foam susp) that will handle 100W rms that will work well in 175 liter reflex enclosures. I like the look of the JBL123a's & the JBL2213h's for their build but not sure of suitability. I'm running a 75Wrms tube amp. My knowledge of enclosures goes as far as basic concept so your help would be gratefully appreciated.
I'd like to throw a bunch of part # at you, but what's the application exactly? What midrange or HF driver will go above and possibly which horn or waveguide? Intended Xover point? How much bass extension and do you intend to run subwoofer(s) as well? Depending on some of the answers, it could be worth going to a 15" since you are willing to have a fairly large enclosure, would you go that route?
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Old 11th July 2014, 03:12 PM   #10
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Thanks heaps for lots of great information. I made the boxes some Years ago for wharfedale super 12'' rs dd's but kept cooking them they were only 20 watts. The boxes are well braced 32mm MDF so i dont want to part with them.
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