Need some diagnostic advice

[sbelew 10+ year member]

I have a Massive Audio NX5 amp, and 2 JBL GTO804's. Also using a relay to turn amp on and power a fan. Its worked fine for years but lately, when I turn the HU on, the 4 channels come on and work fine, but the subs do not. I have to turn the volume up quite a bit to get the subs to start working. Can anyone give me some ideas where to start looking for problems?

Thanks

Steve

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[the727kid 10+ year member]

Try another speaker or subs. This will quickly eliminate if the subs are going bad.