ebtech ..how to

[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

[billyo]

hey guys..dont know what else to do here..bought the hum elliminator connected from my speakers to my board, bought (3) 3 to 2 prong adapters, bought the radio schack ground loop isolator which is connected to my extigy sound card, im not getting anymore hums now..im getting a low hizzzz now..from my speakers..is this normal..like i said i am using a mackie sr450 powered speakers and a dfx mackie board..the hizz doesnt get any louder even with the volume up..

[Beavis]

i never run my computer volume past 50% or half way up the slider.

if you have it full tilt, you will get noise.

[mhollyts]

Based on equipment you can run your PC at full tilt... without noise. I do it all the time. If you have good equipment with all updates you should not have a problem. There are cheap sound cards that will cause buzz/hiss/noise but good cards in the PC/laptop should be true to the sound and not add anything.

[zzeliminator]

Hello. I used a Mackie 808S powered mixer with my Mackie SRM-450's. No, I don't connect the 450's to the powered speakers outputs. I connect to the "Mixer outputs" on the front of the 808S like Mackie said to do on the phone.

In my regular gig, I use the 808S and 450s with only getting a minor amp "amplifier noise" noise. I was told in this normal in powered speakers.

I played in another building this weekend. The wall outlets were so weared out that just the weight of the cord was pulling out the end of the cord. And there were three light dimmers for the stage lighting. Speaker hum, Oh yeah!

I ran a extension cord to some other outlets to try to get onto another circuit, but all the wall outlets were on the same circuit.

I don't think the 450s like to run without the ground prong.

I would do this: Plug up the electrical cord to one 450 and turn it on (no audio cable connected). Do you have hum, if so, note how much. Try to clean up the hum there.
If not hum, continue to connect up your system, one cable at a time, turning on the power each time you add. You should find out where the problems is.