20 Most Recent Mackie HR824-MK2 System Questions & Answers

sw3 on the rear is low pass sw is bad contacts, c61 and oil contacttreatment,ok.

Put a sound system between them and the TV, or better yet get the TV-audio from the Cable/SAT box in digital.

1st, if you want a new speaker(just the sub, not the cabinet), ask Mackie for the nearest dealer.
2nd, If you want to have the speaker reconed, I can recommend :

Central Florida Speaker
714 W. Smith
Orlando,FL 32804
407.423.6566

They do good work.

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