2*12" Epik sub in a compact enclosure - pls verify if ok - diyAudio
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Old 26th February 2015, 08:14 AM   #1
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Default 2*12" Epik sub in a compact enclosure - pls verify if ok

Hi

Just ordered 2 Epik 12" drivers with the following specs:

Znom
4 ohms
Re
3.5 ohms
Sd
494 cm^2
Pmax
1000 W
Mms
230 g
Cms
197 uM/N
Vas
69 L
Fs
23 Hz
BL
22
Qms
3.13
Qes
0.25
Qts
0.25
Le
3.15 mH
Spl
87.9 1W/1M
Xmax
22 mm


For the enclosure e.g. AJ Designer gives 10L for volume with Fb 64.4Hz and F3 65Hz. This is consistent with e.g. TC Sounds 12" AXIS and some other calculators. TC, however, has RMS 1000W and peak of 4000W.

SET-UP / CONTEXT

The room is living room of regtangular 5.5m*4.3m (18ft*14ft) with same size kitchen / dining space behind the surrounds.

For AV, I have Marantz NR1605, and as main speakers Phonar M4 shelf speakers, C4 center and Paradigm One Millenia as surround.

Phonar must be more or less unknown in the US but it is a top level producer that manufactures its products in Germany and stamps them with "hand-made in Germany" label.

For us, there is now plenty of quality volume with these; with -15dB from the reference level, even my 12y son ask to decrease volume. So, -16.5dB below ref is the actual max.

The location for teh subs is pretty optimal location on side walls opposite to each other, bit closer to the main speakers than the very middle of the walls.

For subwoofer amp, thinking Behringer iNUKE 1000DSP or 3000DSP (and module to convert RSA level sub output to PA level). Cost benefit of this vs. two 1000W plate amps esp. with DSP/EQ is obvious.

Therefore, compromizing the output and efficiency. Tiny 10L is pretty perfect from the dinner table distorsion's point of view, too when it gives size of 14*14*12 for the box. As to the outlook, I am planning to follow Phonar's visuals (black piano, slight roundings, 3 degree angle of the front plate as with Phonar's S4 sub).

Most of the audioholics here clearly preference is anything starting from 15" but to me that felt an overkill putting the whole high-quality smaller system in imbalance.

Am I on the right track considering that I prefer moderate size, high quality, balanced sound instead of getting teh lowest of the lowest and moving the sofa around? While the volume is consistent with that for TC's, it still so much smaller than e.g. SVS SB-2000 (while closer to SB-1000, of course).

Anything special to pay attention when building such small boxes like an extra weight?

thanks in advance,

J
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Old 26th February 2015, 11:45 PM   #2
sine143 is offline sine143  United States
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Join Date: May 2010
other than the obvious need for a larger enclosure, why not port those drivers? it would easily extend response down to 20hz in as small at 50 liters.
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Old 27th February 2015, 06:21 AM   #3
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Join Date: Feb 2015
Default Calculator wrong?

ok - thanks - naturally, the box size the calculators give is small but that is what they give. And since there is similar size for TC Sounds' 12" driver defined by the manufacturer, this 10L volume gets some credibility.

50L ported does not sound bad either; how about then PRs? There are some tiny boxes with PRs in the market like from Velodyne.
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Old 27th February 2015, 06:33 AM   #4
jakubg is offline jakubg  Slovakia
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Join Date: Jul 2010
Location: Bratislava
With that power handling I would stick with small sealed and EQ to flat ~25hz. PRs are hard to do right.


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Old 27th February 2015, 06:44 AM   #5
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very good; appreciate fast replies.

flat 25dB sounds quite sufficient; I still get comments of Phonars which are 1'2"*8" so 25dB from 10L box sounds pretty generous actually.
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Old 27th February 2015, 11:01 AM   #6
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ref comment below from jakubg, are there better power alternatives I could consider?

Behringer has received quite good review and both have good specs. iNUKe 1000DSP is roughly 220, 3000DSP rougly 310.
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