Using DMM to read amp for common ground.

I have very limited knowledge for using a DMM, enough to be dangerous. I have a pair of SDA-CRS monitors. I would like to check my amp to see if it is a common ground amp. I have read you check between the neg speaker posts on the amp. Where do I set the DMM to get the reading & what am I looking for. I have read it several different ways and I am confused. Should I test with the amp powered on or off. Please help.

Comments

  • F1nutF1nut Posts: 42,966
    Amp off and unplugged. Set the meter to read ohms. Put one lead in the right negative post, the other on the left. If the meter reads zero ohms it's common ground.

    Tip: touch the leads together with the meter on and set to ohms. Note the reading, which may not be exactly zero. For example it could be 0.2. So, when testing the amp if the meter reads 0.2 it's actually zero and the amp is common ground.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."


    President of Club Polk

Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!