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Old 1st December 2007, 08:00 PM   #11
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Here satelites :

http://www.jamo.com/Default.aspx?ID=...roductID=17639

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and the boomer:

Click the image to open in full size.

I want to build a system triphonic.
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Old 1st December 2007, 08:06 PM   #12
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On second look, the RV2 pots may be redundant if the source unit has a volume control. I still don't like pots in the feed-back loop. Hard to get the high frequency compensation right at both extremes of the pot.
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Old 1st December 2007, 10:02 PM   #13
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Quote:
Originally posted by Kevin Graf
On second look, the RV2 pots may be redundant if the source unit has a volume control. I still don't like pots in the feed-back loop. Hard to get the high frequency compensation right at both extremes of the pot.

How to make then? You can modify my diagram?
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Old 2nd December 2007, 08:05 AM   #14
AndrewT is offline AndrewT  Scotland
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Gain=20*log(r2/r1)
if r2<r1 then result is negative.

To avoid Kevin's worry of parasitic capacitance on the inverting input, you can replace the pot with a fixed resistor once you have the levels matched. But, look at any inverting attenuator and they adopt a wide range of adjusting resistors.
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Old 2nd December 2007, 03:07 PM   #15
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After clacul here the final diagram. I will use a potentiometer to be welded onto C.I for the RV2.

Does that seem to you corect?
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Old 2nd December 2007, 03:53 PM   #16
AndrewT is offline AndrewT  Scotland
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Hi,
I think RV2 is too big.
47k/10k gives +13.4db.
each output is mono when the signal is low frequency so the effective gain from adding both channels is 6db higher i.e. +19.4db.
or 47k/(10k/2)=+19.4db
Reduce the pot to 20k (+12db) or maybe as low as 10k (+6db).

0.47uF for DC blocking caps is too low. It will remove some of the sub-bass signal that your summed channel is trying to pass.
2u2F would better suit the 50k input pot.
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Old 2nd December 2007, 05:30 PM   #17
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Like this?

Click the image to open in full size.

These new values give a beach of adjustments of +6db to -20db.

The speaker JAMO make 86db output and the sub-woofer make 87db.

According to my style of listening I will be able to adapt the level of the boomer by raport to the JAMO speakers.

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