Audacity Forum

Transformers do have non-linear characteristics. One of the more noticeable effects is the loss of low bass frequencies. Transformers that are substantially linear over the audio frequency range are not particularly cheap. The preferred solution is to try and eliminate the source of the hum (though...

This is one of those "hands on" jobs that it's difficult to help very much with over the internet, I agree - and I appreciate the time that you have taken - sometimes it helps just to have someone to bounce things off - - - I live in an apartment complex, so who knows what is hooked up to the power...

Well - I may have spoken too soon. The situation IS much better, when all inputs are muted on the mixer. But the same buzz/hum comes back when I un-mute the amplifier input, and a different (smaller in -db) buzz/hum when the reel-to-reel input is un-muted - - -

I believe that I have this solved - I purchased a cheapo Radio Shack Ground Loop Isolator ($17) and hooked it up between the output of the mixer and the Line In on the computer - no buzz/hum! If I crank the Audacity input level slider to max, I can see a little fluttering in the right channel, well ...

Excellent - you're getting close to tracking down the source of the noise. If you plug your headphones directly into the mixer, can you hear the hum in your headphones? If you completely unplug the turntable from the mixer do you still hear the hum? By the way, where is the "phono (RIAA) pre-amp"? ...

Actually, the hum/buzz is present even when none of the audio units are powered up except the mixer.

Thanks for your input - my feeling is that it should be eliminated, too - I guess I just needed validation. I just looked at the DAK item you mentioned - they show it being connected to the speaker out jack on the computer. Since the unit is an isolation transformer, I assume that it would be just a...

I am presently attempting to set up my recording layout to transfer my out-of print lps to digital. My stereo/mixer setup is about 15 feet away from my computer, and I am getting an obnoxious hum - I have been reading the posts about how to reduce the hum, including the link to the MICROHD HD400. My...