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Old 17th March 2009, 10:28 AM   #1
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Default Omnes L8 on OB

Hi,
I just fitted the Omnes L8 to a sheet of MDF, 600x1200x16.
Driven by Bryston powerpac 120's, Audionote kit pre, and a Keces usb dac from the pc.

The sound was very ordinary to start with, but with some tweaking of the EQ in J. River, I was able to get the sound really good.
I had to turn up the lower frequencies and this made everything click.
I've added a Infinity emit tweeter with a 7uf cap in line to it.

Nothing special to look at, I'll sort that out once I've got it sounding spot on.

Click the image to open in full size. Click the image to open in full size.

I'm after some help on what woofers to fit. From what I've seen using the Eminence 15" alpha is a great choice, but these aren't available to me in Australia (I can't find anyone that has it), I can get the Beta's at $350 for 4, but these would probably need more work in regards to amplifying.
Or I can get some cheap chinese 12" drivers $35 each, specs -
Paper Cone.
Foam Surround.
Z 8W (9.2Wdc)
Freq. 27Ū3KHz
Fo 36Hz
Sens’ 90dB
Magnet 13 Oz
Voice 32mm
Power 50W nom.
Qms 4.39
Qes 2.07
Qts 1.40
Vas 276.77L


Any help would be appreciated.
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Old 17th March 2009, 10:42 AM   #2
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Where did you buy those drivers? Import?

I posted FS eminence alpha in the trading section sometimes ago.
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Old 17th March 2009, 11:07 AM   #3
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Quote:
Originally posted by gainphile
Where did you buy those drivers? Import?

I posted FS eminence alpha in the trading section sometimes ago.
I'm interested how can I contact you.
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Old 17th March 2009, 11:45 AM   #4
Rudolf is offline Rudolf  Germany
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Scrappydoo

maybe you would like to look at another project with the L8. You donīt need to read it (itīs all in German). Just look at the beautiful craftsmanship. Should make you really envious.

Click the image to open in full size.

In post #22 I show a passive filter to raise the low frequencies of the L8.
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Old 17th March 2009, 12:36 PM   #5
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Quote:
Originally posted by Rudolf
Scrappydoo

maybe you would like to look at another project with the L8. You donīt need to read it (itīs all in German). Just look at the beautiful craftsmanship. Should make you really envious.

Click the image to open in full size.

In post #22 I show a passive filter to raise the low frequencies of the L8.

Thanks Rudolf, all the photos have gone from excess d/l
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Old 17th March 2009, 10:21 PM   #6
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Very impressive build indeed

Scrappy, email me: gainphile at gmail.com
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Old 30th March 2009, 09:37 AM   #7
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Just an update, I grabbed the eminence drivers from gainphile (thanks).
Fitted them to the baffle and cut it down to 400mm at the top for the omnes driver and left it at 600mm for the 15" drivers.
I'm going to do active crossover and bi-amp it.
Click the image to open in full size.

Please don't look to hard at my woodworking skills.
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Old 31st March 2009, 01:10 PM   #8
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Hey grant, how do the 2x eminence sound? I think I miss them already ... how deep compared to my jaycars?

Going active means you can equalize them easily if you'r not a 'purist' a.k.a. audio agnostic.... I think I still have the eq circuit.
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Old 31st March 2009, 09:05 PM   #9
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Hi Andi,
I haven't run the two of them together yet, I need more amps and a crossover setup.
If you have any circuits for eq etc, please send them my way.
Thanks.
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Old 31st March 2009, 11:16 PM   #10
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Eminence Betas are eminently suited to sit in H-baffles. That will sink Fs a bit and equalize response with the choice of a suitable crossover frequency. Read MJK's excellent paper: http://www.quarter-wave.com/OBs/U_and_H_Frames.pdf .

Put two Betas in parallel in an H-frame 40(w) x 80(h) x 40(d) cm (inner measures).
Cross them over with a LR-filter 10 mH 160 uF then put the Omnes above on a separate baffle and please the magnetostat above it. Crossover for the Omnes LR should be 47 uF and 9 mH and you are home. No EQ will be necessary, 30 Hz about - 5 dB, average SPL/2.83 volts 95 dB, all passive.

/Erling
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