performance teknique 1200w

[timwebb]

i just got this amp it cut out every time the bass hit,but it will play good until it hits a bass line. what would cause this??

[mike49504]

Are you running the amp at to low of an ohm load?

How many subs do you have connected to this amp??

Single or dual voice coils?

[timwebb]

the person who had it ran it at 2ohms its a 2ohm amp i dont know how stable its is though

[Perry Babin]

If the amp only shuts down when it's driven to relatively high volume, you need to confirm that you have sufficient power supply voltage.

With your multimeter set to DC volts, the black meter probe on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle), the red probe on the B+ terminal of the amp and the amp driven to the point where it shuts down, does the voltage drop below ~11v?

[timwebb]

i tried that its was at mid 11v i hooked it up to a power supply and it did the same thing, it idles normal,it would be the rail caps would it?

[Perry Babin]

Was this on a long bass note or a short note?

If it was a short note, it may have dropped even lower but the meter may not have been fast enough to read the dip in voltage.

You should try to determine why the voltage is dropping that low in the vehicle. Begin by measuring the voltage at the battery to see if the alternator is able to maintain sufficient voltage. If it can check the wiring, fuses and all connections to see where the voltage is being lost.

[timwebb]

i went and check the truck the voltage is 12.2 off and 13.0 running i got a little 400w
and and hooked it up the volts dropped to 10v before it cut off i guess thats what mess the amp up.i hooked it up in another car and it does the same thing

[Perry Babin]

Does the voltage drop with no speakers connected?

If so, it may have shorted output transistors and it's drawing excessive current.

[timwebb]

yeah it does i wasnt sure because it played thanks i got some direct replacements ill put them in tomorrow thanks again man!!!

[timwebb]

sorry im a little of topic but i just got two memphis amp one 1000w and a 1100w with the same problem. does everyone blow these amps? ive to many of these.