I have a Trace Elliot bass amplifier (gp7sm 130) and it makes a buzzing soound. Any ideas?

2.67. ohms


How to hook up speakers correctly for proper impedance

Either the speakers have loosened from the faceplate, or one or more have blown. Open the amp and tighten them down. If that doesn't fix it, remove them a take them to the nearest speaker repair shop for a checkup. If blown either have them re-coned or replace them.

Check continuity on all cables, try a different cabinet with the head and a different head with the cabinet and the bass with a different rig to see which part of the chain isn't working, make sure the volume controls are turned up on both the amp and bass. Once the problem is narrowed down it will be easier to advise you.

• Could be drive transistor , output transistor or both on the main amp.

But check for power supply and in the preamps also.

• A signal tracer will come in handy when troubleshooting these kind

of symptoms.

• Measure supply voltages,

• Check offset voltage

• Check idling current

Isolate , and trace afterwards.


• Schematic is really needed when there are burnt and unrecognizable

component. But one can use similar schematics to analyze circuit

problem.

the input jack is probably grounding or has a bad ground. it probably has a bad solder joint on the jack to the circuit board. if you can open it up gently look at the pins of the jack to the pcb. make sure the battery is disconnected! dont want to short anything out. it may be hard to see, but you can push on the jack and see if the legs/pins move, etc. humming and buzzing sounds usually are a bad ground. especially on a unit this small.
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Hello gecpimp,

It certainly sounds like the speaker has failed. Most OEM speakers have paper cones and cloth surrounds and it is not uncommon for the adhesive to give out in the vehicle environment.

The Avalon uses the "workhorse" of car audio speakers. Both front and rear are 5-1/4" and you can get great aftermarket speakers in that size. Unfortunately, no 5-1/4 speaker is really good at reproducing bass. A really good set of Focal full-range speakers, the Polyglass 130 CVX runs $300 at www.crutchfield.com. Somewhat less expensive are the JL Audio C2-525X at $180. Speakers such as these will give you the best sound. Somewhat less expensive are Alpine and Infinity, but they're still good. It would probably be a good idea while you have the door panels off, to go ahead and replace the fronts at the same time.

Hope this helps.

Make/model of receiver or amplifier?

Type of speakers -

The buzzing is a 60 hertz ground loop - most likely.

Make sure all connections are properly grounded and that all connections are firmly in place. Assure that wires are connected correctly. If necessary, trace each wire to assure proper connection.

Older phonographs have ground connections. Most receivers have a ground lug nut connection.

Hi, The most common cause of this is blown output transistors, assuming this is not a valve amp. 
At any rate, this is something you will want to have looked at by a tech.

The problem you have mentioned is a common one with old sets, but it also occurs in new ones also, though not frequent. You can fix this just by changing the electrolytic filter capacitors in the power supply and sub filters on the amp PCB. The new capacitors should be of the same or higher voltage rating and same capacity rating as of the existing ones. And as it is such an old one, it is better to change all the electrolytic capacitors to avoid any further problems.

open the amp and look for a fuse either on a circuit board or on wires inside. trace power wires onto board.