Can you diagnose my PA speaker problem?

[Frost]

Almost dead voice coil, bent/scraping voice coil. Dirt in the voice coil gap

[S2udio]

I Would go for the voice coil suspension wire coming lose or a simple dry joint aggrevated By vibration

[LeeYoo]

Time to get the DMM out.
Measure the dead speaker on the terminals.
Should be almost 4, or almost 8 ohm, depending on the driver.
As said, open circuit could be the pigtails.
Sometimes just worn or broken, sometimes bad solder connection to the voicecoil.
Leo..

[ripple_fx1]

if you're able to swap the amp channels and the problem stays with the first sub, you've eliminated the amp as the problem. do the same with the cable. lay the speaker out and don't disturb its position for the next tests - with the speaker in it's "not working" condition, check the resistance at the speaker with your meter, no amp attached. with the box in it's "working" condition, check the resistance with your meter, as above. do this twice. tell us what you find.

[hayythere]

Originally Posted by ripple_fx1

if you're able to swap the amp channels and the problem stays with the first sub, you've eliminated the amp as the problem. do the same with the cable. lay the speaker out and don't disturb its position for the next tests - with the speaker in it's "not working" condition, check the resistance at the speaker with your meter, no amp attached. with the box in it's "working" condition, check the resistance with your meter, as above. do this twice. tell us what you find.

I did connect another sub to the parallel out of my problem sub and the second sub worked whilst the problem sub was silent. This rules out the amp and cable.

I will check the braid wire and soldering when I have time as that sounds like a possibility.