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Old 13th November 2008, 05:03 PM   #1
zigo3 is offline zigo3  Italy
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Join Date: Feb 2007
Location: italy
Default Please help with double attenuator for biamp

This is my first diy project and my questions are by sure "simples" for you.
I have projected a double attenuator for passive biamp.
I used 2 24 steps 100k attenuators like that Click the image to open in full size.
Click the image to open in full size.
The idea was connect the imput to the first (A) of the 2 attenuators and connect 2 outputs from that, one to one of the 2 powamps (9wpc) and the other to the second attenuator (B). Then the output of this second attenuator to another powamp (100 wpc). In this way I can equilibrate the power difference of the 2 powamps with the second attenuator B and use the first A to regulate the volume on both.

The problem is that the ouput of the B attenuator is too low even if I regulate it at the maximum: it's so low that it's difficult to hear.

Where I am wrong? Maybe 100k is not correct?

Thanks in advance!

Rob

This is the simple scheme Click the image to open in full size.
Click the image to open in full size.
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Old 13th November 2008, 06:14 PM   #2
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK
Hi,

you seem to have it the wrong way round.

Input to attenuator A. (= overall volume)
A's output to 100W amplifier + attenuator B.
Attenuator B's output to the 9W amplifier.

/sreten.
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Old 13th November 2008, 07:07 PM   #3
zigo3 is offline zigo3  Italy
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Join Date: Feb 2007
Location: italy
Quote:
Originally posted by sreten
Hi,

you seem to have it the wrong way round.

Input to attenuator A. (= overall volume)
A's output to 100W amplifier + attenuator B.
Attenuator B's output to the 9W amplifier.

/sreten.
You are right...I can't understand why but it is.
Thankyou very much!!!
Now the problem is that I must use B close to the max and if I use the A at max the sound level is medium, far to be high.
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