Comments on: mobile dj tips remove laptop noise

By: garryentropy

garryentropy — Fri, 05 Oct 2012 15:30:48 +0000

Hi dj? freebey, usually there’s not a problem from a pc with hum or noise, its the laptop power transformer that causes the problems, try plugging the nf filter between all your audio connections, and also check that the earth wire from the turntable is connected to your amp ground, best garry entropy

By: markkellr

markkellr — Fri, 05 Oct 2012 15:14:53 +0000

the hum noise that is? heard, this is from the supply current which vibrates (in my case) at 50khz. (uk and and ireland)

By: Peter van den Berg

Peter van den Berg — Fri, 05 Oct 2012 14:34:38 +0000

Just plug in? the computer in a different socket then yoyr soundsystem and gone is the hum. You don´t need a filter

By: markkellr

markkellr — Fri, 05 Oct 2012 13:45:45 +0000

no i dont think so, at the end of the day all? wiring in a building arrives at the same main board. the problem is going to be the same in any of the sockets that your comp is plugged into

By: djsmog69

djsmog69 — Fri, 05 Oct 2012 12:54:47 +0000

or use a dedicated audio interface which will give? you much nicer sound than your standard mini jack

By: tongeneratorcom

tongeneratorcom — Fri, 05 Oct 2012 12:19:18 +0000

hmm…

i dont think that this is a very good solution, because it is a filter.
the filter will always also effect the sound itself.. also the filter canot actually eliminate the noise but reduce it as a filter works…

so when u want to realy get rid of the hum noise, u need to use a driffrent technic.. sry my english is not so good.. so it is kind of hard to? explain…

i cary on my answer in a second part… (have no letters left)

By: tongeneratorcom

tongeneratorcom — Fri, 05 Oct 2012 11:47:31 +0000

so what u need is called galvanic isolation…

u schould have a look at this technic? and see the diffrence of a filter….

galvanic isolation is used by the Behringer Humdestroyer HD400 for exaple… this technic actually isolates two seperate circuits and transmites the audio via air or optocopler.. so it does not effect the sound as like a filter would do…

the result will be elimination of the hum by 100 %, no filtering

hope this helps

i had many problem with hum in my studio, trust

By: MobileDjWizard

MobileDjWizard — Fri, 05 Oct 2012 11:02:48 +0000

We had trouble with hum from not only our laptops but from the mini HP mounted in our small system. We use a sreteo D.I. box on our big system tp eliminate hum, but our small system is not affected as much from the mini desktop PC permantly mounted in the systems case.I would mention the big system uses a Mackie 1402vlz mixer and the small system? uses a Mackie 808s mixer amp.

By: garryentropy

garryentropy — Fri, 05 Oct 2012 10:18:58 +0000

i find as soon as you get any sort of transformer in the circuit? then you get hum problems,because if you run from batteries its usually ok,but batteries are too risky for a live set up )II(

By: MobileDjWizard

MobileDjWizard — Fri, 05 Oct 2012 09:58:35 +0000

Batteries? Our D.I. Box is a passive unit Do some of the other ones out there use batteries? Never seen one of those. Our? laptop runs runs 1/8″ cable out of it into Our DI box and 2 more cables out of the DI box into the Mackie mixer. We use 2 channels to get our stereo output. You are right batteries would be scary to use especially if the box was burried in the case under cables and such.