New System - Amp Question

[AchillesClone]

I installed a new system in my car (speakers, subs, wiring, head unit, amp) using a Boston Acoustics GTA-1005 5 chan amp. At first, every speaker output was soft and crackly. Finally the sub output just stopped. Did every troubleshooting thing I could think of. Not the RCA's, not the subs themselves, not the other speakers, not the HU. Fuses werent blown in the Amp, no protect mode. So I sent the amp back and got a new one.

Same exact wiring, same setup, put the new amp in yesterday. Sounded great! Turned it all off, put my car back together, turned it all back on to tune the amp. Again, sounded great ... for a minute. Then it all sounded soft and crackly like the first amp, and then ALL the outputs died. No blown fuses (this time I checked the fuses with a meter and even tried the spares), amp never went into protect mode. I wasn't touching a single thing when this happened. I literally have no idea what could keep happening. Any ideas?

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[keep_hope_alive Premium Member]

pics of your install and the connections please. any short on any speaker wire can cause the amp to do this. describe the connections you made at each speaker and sub - proper terminals used?

Use a DMM to meter each speaker wire at the amp (disconnected from the amp first). measure resistance between each speaker wire pos and neg (should be just below speaker impedance or DCR, and between each pos and neg to ground (should be O.L. or very high - more than 1Mohm).

 

[PJK485 10+ year member]

Yea it sounds like a grounded speaker to me. You can also check by putting ur DMM on Voltage DC and disconnect the wires from the amp. Then put one side on positive 12v and the other side on the speaker wire. If it shows 12v then you have a grounded speaker or wire.