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if the fuse blowes when you swtich the power on its the power supply circuit. if the fuse blown after a short while that the Amp is on its possible that protection circuit is short
if you want to fix the Amp let me know
when you change the part on the power supply did you check that the voltage is the same as it should be.
maybe there is no voltage to the protection unit in this case the Amp will not power on
if you want to fix the Amp let me know email@example.com
Chances are your speakers were "fake rated" as are most consumer quality speakers.
Unless the speakers were rated for CONTINUOUS power at 500 watts each you could easily destroy them with that amp.
Check the DC bias out of the amp. If it is under a volt, your speakers were fake rated.
This fake rating is to sell speakers and depends upon average music programing that does not have continuous high level.
Get professional speakers in MATCHED cabinets that have CONTINUOUS pwer ratings above what the amp can produce. ALSO suggest you put fuses in your speaker leads to protect the speakers.
WITHOUT proper cabinets, the speakers can be blown.
You should probably get a sound level meter to check that you are not damaging your ears. No fun in later life requiring expensive hearing aids! There are professional quality meters for about $140 on eBay.
Hi, If you have small electronics knowledge this might help you. First fine in each mixer the amplifiers line In if your mixer has two amplifiers then you have four line In. Disconnect this line from your mixer and build a circuit Line out multiflier. You can use op amp for this application this is a simple circuit. You made two input and four outputs. If you are interested i can send you a schematic diagram.