ebtech ..how to

[billyo]

can someone help me how to hooked this up..i have this connected from output of my soundcard to the ebtech input, ebtech output to the input of my mackie board, im still getting hum from my speakers ( mackie 450 active speakers ) had all the volumes down, still getting hum..turned up the mic volume hum got louder....need help..

[kedmison]

billyo,

I too use mackie. CFX12 mixer, 450's and 1501 sub. What you are describing may be a ground loop problem coming off the computer. When I first started using Hoster over three yaers ago I encounterd an awful hum. I thought it was the board, the speaker. I didn't know. What it ended up being is I had to use a three to two ground plug on my computer cord. Try that and see if it helps.

Kelly

[billyo]

kedmison, thanks for the reply.. the problem is i have everything t/off except the board and the mackie speaker..im still getting hums, i will sure try to use the adapter 3 to 2 prongs.thanks..

[kedmison]

Not sure what your referring to as "ebtech." What is ebtech?

Kelly

[billyo]

ebtech is the name of a company that makes hum elliminators and other products..

[mindonstrike]

Hum eliminators only work when placed between the offending pieces of equipment. And since powered speakers tend to be plugged in on other outlets/circuit breakers and or 120v legs than your board and other equipment is, my money would be on a problem between a speaker(s) and board. Flourescent lights and light dimmers and fan speed controls being on the same circuits can cause problems as well.
You can read more about it here http://www.epanorama.net/documents/g...pa_advice.html

I'm not trying to lecture here but in the interest of having all the facts:
Just something to ponder when liberaly using 2 prong adaptors. Without the adaptor if a piece of equipment develops a ground fault it will trip the circuit breaker. With the adaptor anything metal connected to it becomes energized and just sits there waiting for a path to ground to come along. That path may be you or one of your singers.
Worst case scenario: Some old guy with a weak heart or a pacemaker get's a nasty shock and dies, you are now guilty of negligent homicide because you defeated the safety features that would have protected him.
Ultimately it's to each his own.

Sam

[mindonstrike]

Originally Posted by billyo

can someone help me how to hooked this up..i have this connected from output of my soundcard to the ebtech input, ebtech output to the input of my mackie board, im still getting hum from my speakers ( mackie 450 active speakers ) had all the volumes down, still getting hum..turned up the mic volume hum got louder....need help..

What happens when you unplug the mic and turn that channel fader up?
If the hum at least does not get louder you have a bad cable, a bad mic or possibly a mismatched impedance for that portion of the problem.

BTW does the hum go away when the computer is disconnected?