Question about Boss GT980 Car Audio Amplifier

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Can't get the amp power on

I turn on my car and the amp goes to "protect" which is red instead of "power" which is green and turns it on. I've checked the ground wire and its functional and working. The power cable is connected and has all new fuses as does the amp. So i can't figure out why the amp won't power on. If you could help me i would greatly appreciate it!

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Hi, by design the protect mode is activated if it senses a fault in the system which can either be: speaker problem - check the speakers connected to the amp. also check that the speaker wires are not (scraped) rubbing to the car body. On the speakers themselves, using a continuity tester (better with a VOM) should indicate anywhere from 4 to 8 ohms on the terminals. In the absence of a continuity tester, a single AA battery will do to check if the cone/coil will move if the AA battery power is applied to the speaker terminal (this is not a sound practice but in the absence of a tester only). If the reading is either 0 ohms or infinity (no reading) or no movement (if using the battery method), then the speaker(s) need replacement. Amplifier problem - this is identical to the problem and possible solution at http://www.fixya.com/support/t162539-amp Good luck and hope this be of some help. Pls post again how things turn up. Kind regards.

Posted on Jul 31, 2007

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Thankyou for the detailed fault description..it really helps!

sounds like there is one of these 3 things wrong:

1. leaky or partially blown mosfets on ouput power stage of amplifier are leaking DC onto speaker output causing amp to go into protect..this explains any banging or clicking herd.

2. There has been damage to the internal SMPS and is going into protect because of an internal rail over-voltage/under-voltage.

or 3. you have a shorted speaker lead or sub that is bringing the amplifiers load down to less than 2 ohms..buy or obtain a multimeter and have a poke around and check all your speaker leads on the ohm setting anything lower than 1.6 ohms and you have a short...also make sure that you have correctly loaded amplifier to..alot of begginer audio enthusiats overlook this important step and cook amplifiers!!

remeber impendance ratings, have a look on google, search "impendance formulas" and study up if your unsure!

hope this helps,ben

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check the impedance load or try a different ground. when you hook your ground up always make sure you sand the metal down before you connect to ensure a good and clean connection.as for the impedance, make sure your subs are wired to the right ohms. for example, if your subs are wired to 2 ohms or even 1ohm, and your amp is only 4 ohms, then it will do exactly what your saying it does.

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