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PC Stereo setup issue.


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Hi folks,

I am posting this here because I know there are a lot of people who could hope; I have been inundating Ryan Inman with emails since he just made my Sherwood S-5000 sound great, which is part of this whole debacle. I would like to add that, as you all you, Mr. Inman is a top notch tech & and a great person.

System:

Sherwood S-5000

8 Channel DJ mixer

PC w/ M-Audio Delta 44 audio card connects via parellel cable to breakout box which has 4in 4out (2 stereo in 2 stereo out) ...all 1/4" jacks (accepts balanced or unbalanced)

Overall plan:

To have components run to mixer (tape, tube tuner, cd) and output via rca cable to Sherwood via AUX input.

HW-19 inputs into the Sherwood via rca cable into PHONO stage.

REC out of Sherwood goes to Delta 44 break out box via (2) rca>1/4"

Output of sound card runs to mixer via (2) rca>1/4" cables

Problem:

When nothing but the REC out of the Sherwood is connected to the breakout box inputs 1&2, I get massive feedback hum on the speakers. This is with any stage selected, AND it doesn't occur on inputs 3&4 of the box. When I unplug the box from the computer the hum/feedback stops on channels 1&2.

My box is fried, it won't OUTPUT any sound to my mixer.

My question:

When I get a new box or soundcard, am I going to have the same problem again. Is there any inherent fault in this setup? I was getting the feedback before a feedback loop fried the box so I am inclined to believe the box was at fault from the beginning. You can use software to mute all inputs of the card etc. to avoid any type of signal loop, which I had never had a problem with with my M-Audio 24/96 audio card.

The computer is earth grounded. The audio components are not, they all run into a line conditioner which itself is earth grounded. The mixer has three male prongs on itself but the side that plugs into the conditioner is a two prong. Ryan removed the capacitor the grounded the line voltage to the chassis so I would not have a problem. I did have my tube tuner running into the mixer at the start which has not been worked on.

Again, I am inclined to believe either the box was faulty or there is some inherent design in it that will make it not compatible with my setup.

Thanks for any advice in advance.

Jonathan

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