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First One - mosFET amplifier module

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Last Night I found the Problem ,I tried a lot and found out that FO with SMPS doesn`t like a Main Filter in Front. Every other Gear I got ,has no Problem with it,tried every Combination .Is that Normal ? I mean,I`m happy that I found it,but with the Filter in Front it sounds better ,even with that Noise.

Hi taccodude,
Could you let me know what kind of filter did you use?
I configured the FO temporarily as attached photo.
Overall sounds are great.
However I can hear some high frequency noise(hum?) from both speakers.
If I disconnect input cable from J1, the hum disappears completely. The hum only occurs input cable is connected. Also it doesn't matter whether input cable is connected with any source or not.

My setup is as below:
- Power: SMPS1200A400 * 2
- AC input: 224.5V / 60Hz
- DC input: +/- 54.8V
- Calibration: VAS, DC offset, idle bias current meet the spec.
 

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Hi taccodude,
Could you let me know what kind of filter did you use?
I configured the FO temporarily as attached photo.
Overall sounds are great.
However I can hear some high frequency noise(hum?) from both speakers.
If I disconnect input cable from J1, the hum disappears completely. The hum only occurs input cable is connected. Also it doesn't matter whether input cable is connected with any source or not.

My setup is as below:
- Power: SMPS1200A400 * 2
- AC input: 224.5V / 60Hz
- DC input: +/- 54.8V
- Calibration: VAS, DC offset, idle bias current meet the spec.

Do you hear the hum with one channel only?

Or only with both channels?