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Old 26th August 2012, 02:22 PM   #1
cdfr is offline cdfr  United States
diyAudio Member
Join Date: Jan 2005
Location: Seattle
Default Pass Labs X0 and Notch Filter

This may be a question for Wayne or Nelson.

I have built a flat open baffle speaker with Orthophase wide band drivers (later to be mated above 5K by ESS Heil AMTs), and I am trying to eliminate the obnoxious peak you see below:
Click the image to open in full size.

Using components I have, I was able to build the notch filter below (centered at 2.5K instead of 2.7K).
Click the image to open in full size.

The mystery is the following, when I plug this circuit between the Pass Labs X0 Tape Out and Tape In the result is really bad:
- Very dim sound
- Seems to filter out everything, no bass just trebles

When I plug the same circuit between the output of my DAC (Studer D424) and the Pass Labs X0 Tape In, it seems to work close to what is expected (I have not done precise measurements or listening yet).

What can cause the circuit not to work using the loop Tape Out Tape In of the Pass Labs X0?
I tried the same operation with my fathers Audio Research Ref 1 and it worked fine, so I assume it is a load or impedance issue?
How can I solve this without a nasty Op Amp?
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