Hissing Is Doing My Head In!

[SC Events]

Hi All,

I am having a bad problem with humming and it's driving me nuts.

My Set up is as follows:

My top speakers (ProSound 300W) are going from the mixer's 'Main' out to a Kam KEQ152 Equaliser then in to a ProSound 1600W Amp.

My bottom speakers (R.C.L 600W) are going from the mixer's 'Booth' out to a Gemini EQ-300 equaliser then in to a Behringer EP1500 Amp.

My mixer is a Numark DM1635 (no longer in production)

I am running Virtual DJ through my Laptop and I thought it may have been caused by the laptop charger, but I completely disconnected it from the mixer and I still had the same amount of humming.

I did disconnect the EQ's and the humming reduced quite a bit, but it was still there.

Any ideas how to get rid?

Cheers everyone.

[Steve the DJ]

You need a (or possibly a pair depending on your set up), Ground Loop Isolator such as this.

Put it between your soundcard and mixer.

[SC Events]

I completely unplugged my sound card and the humming was still there.

[Charlie Brown]

Hmm, I think you need to take the earth out of your laptop plug. I bet you £50 the hissing will stop. The magnets aren't that good.

[SC Events]

It shouldn't be anything to do with my laptop as I completely disconnected it and the soundcard and the humming was still there as bad as ever.

[CRAZY K]

Hi All,

I am having a bad problem with humming and it's driving me nuts.

My Set up is as follows:

My top speakers (ProSound 300W) are going from the mixer's 'Main' out to a Kam KEQ152 Equaliser then in to a ProSound 1600W Amp.

My bottom speakers (R.C.L 600W) are going from the mixer's 'Booth' out to a Gemini EQ-300 equaliser then in to a Behringer EP1500 Amp.

My mixer is a Numark DM1635 (no longer in production)

I am running Virtual DJ through my Laptop and I thought it may have been caused by the laptop charger, but I completely disconnected it from the mixer and I still had the same amount of humming.

I did disconnect the EQ's and the humming reduced quite a bit, but it was still there.

Any ideas how to get rid?

Cheers everyone.

Right, standard fault finding method works like this--

Set up your kit as you normally do adding each piece of sound equipment one at a time starting with the amp and one speaker and build it up from there one piece at a time until the hum starts---then you know which item is to blame.

Wont take long.

CRAZY K

[Steve the DJ]

I completely unplugged my sound card and the humming was still there.

It shouldn't be anything to do with my laptop as I completely disconnected it and the soundcard and the humming was still there as bad as ever.

Apologies. I misread your initial post and the symptoms you described are usually associated with a Ground Loop "hum".

[SC Events]

That's OK, I did suffer that problem when I used to use my Dell Laptop but now I use a much higher performing machine

[ppentertainments]

I would follow Crazy K instructions but also try swapping cables about. It is suprising how much problem a dodgy cable can cause.

I had a problem not so long ago where the left side of my amp kept clipping. Changed the speakers over, speaker cables etc and all it truned out to be was the cable connecting the mixer to the amp.

[SC Events]

I shall give it a go now, cheers chaps.