20 Most Recent Mackie PPM608 Professional Powered Mixer Questions & Answers

Get a plug cable and work the plug in and out of all INSERT or BYPASS jacks. These get rusty and interrupt signals. If that is a no, open up and check power supply voltages and all cable connectors, might have been vibration and something got loose... PEACE---

You need to give a few more details before somebody can help you. there are a lot of possible problems.

Why does my subwoofer make a humming noise? The voltage difference between a subwoofer electrical ground and the equipment ground can cause it to hum. This can happen because of the irregular current flow in your audio cable. Turning on the volume too high can also cause a hum.

Hello Redman, I sent you the link to download the service manual of model B112, it is quite similar Check for possible false contacts I hope you can solve the problem Greetings Franco Dosil Hola Redman, te envio el link para que descargues el service manual del modelo B112, es bastante similar Revisa posibles falsos contactos Espero puedas resolver el problema Saludos Franco Dosil https://elektrotanya.com/behringer_eurolive_b112d_sm.pdf/download.html http://www.uns.nu/pdf/Behringer_Speaker_B115D.pdf

Sounds like an earthing problem , check your cables and make sure none of the cables have strands that could be shorting down to earth causing the buzz

I would not try and fix it, I would just replace it.

are you running a sub, daisy chained to it? are they connected to each, just have one, two, four? are you hooked up like in the pic?

http://www.billebro.se/proddoc/PRID_5420_doc_swa1501_om.pdf

Hi. Did you get diagnosis for this? Mine has developed the same fault...

output finals are shot,and get the caps checked also.

Mackie will send schematics free-o-charge.