Aleph P with balanced shunt attenuator

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lauret

lauret

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Joined 2007
#1
Hello all,

I'm using my Aleph P1.7 right now single-ended with a 10K 41-step 1,5dB-per-step series attenuator on the output from Acoustic Dimension. Would it be possible to use this attenuator in a balanced series-shunt attenuator like shown on the right side in this picture:
An externally hosted image should be here but it was not working when we last tested it.


Ok, I have three questions regarding this setup:
Any drawbacks in this configuration? Is the Aleph P1.7 up to this config? And lastly what should be the value of the series resistors?

Thanks!
 
#4
That's a good question. Referencing the signal to ground, it would surely change the response. After thinking a minute, no, it wouldnt work correctly single ended. A simple DPDT switch would work though, switching the bottom of the att. from ground to the other output.

1K is just a guess as you are using it as a variable voltage divider.
 
#6
Bill Fuss said:
That's a good question. Referencing the signal to ground, it would surely change the response. After thinking a minute, no, it wouldnt work correctly single ended. A simple DPDT switch would work though, switching the bottom of the att. from ground to the other output.
Click to expand...

I see that the D1 also uses such a volume control, but there it is squeezed between active circuitry. So that would be the condition for both the functioning of SE and balanced without a switch?
 
#8
balanced attenuator

If you go to Erno Borbely's web site you will find a tweak for a balanced volume control that looks very similiar to yours that he recommends for use with his equipment. You can compare the resistors used in the balanced arrangement. I have tried it and it works fine. dave
 
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