Dertras Posted March 6, 2015 Report Share Posted March 6, 2015 Hello, I just acquired used passive KRK monitors and a Hafler P3000 amp. I do not know the model number of the monitors, so I have attached a photo of them. I have the following problem: If I turn on the amplifier, with the gain set to minimum, I get a hum, some pops and the drivers of the monitors start moving in and out extremely, which worries me. I immediately turn the amp off again. I have tried searching online for solutions to this problem, which I have personally never encountered. If one of you could help me figure this out, I'd be very grateful. Best, dertras Quote Link to comment Share on other sites More sharing options...
Jeff Wexler Posted March 6, 2015 Report Share Posted March 6, 2015 If they are passive non-amplified speakers as you say, the problem is obviously the Hafler P3000. It needs to be repaired. You will need to find a service shop that can look into it. Quote Link to comment Share on other sites More sharing options...
Will Youngman Posted March 6, 2015 Report Share Posted March 6, 2015 yep that has to be the amp. Bad speakers don't behave like that. Quote Link to comment Share on other sites More sharing options...
CraigF Posted March 6, 2015 Report Share Posted March 6, 2015 bad amp Quote Link to comment Share on other sites More sharing options...
mikewest Posted March 6, 2015 Report Share Posted March 6, 2015 Do not use or test again otherwise the amp may destroy the speakers!! mike Quote Link to comment Share on other sites More sharing options...
Dertras Posted March 6, 2015 Author Report Share Posted March 6, 2015 Thank you very much for the answers. I'll have the amp checked out. Quote Link to comment Share on other sites More sharing options...
John Blankenship Posted March 6, 2015 Report Share Posted March 6, 2015 Yes, the amp. Do both amplifier channels display the same symptoms? If so, based on that, and the symptoms you described, the amp's power supply seems a likely culprit. Quote Link to comment Share on other sites More sharing options...
taylormadeaudio Posted March 6, 2015 Report Share Posted March 6, 2015 output transformer? Quote Link to comment Share on other sites More sharing options...
osa Posted March 6, 2015 Report Share Posted March 6, 2015 The krk's i own require inline fuses on the speaker wires. Do these models say anything to that effect in the manual? Just a thought. -Ken Quote Link to comment Share on other sites More sharing options...
JonG Posted March 6, 2015 Report Share Posted March 6, 2015 I own a set of passive krks, different models tho. They have always worked flawlessly with any amp ive put in front of them, no need for inline fuses. Quote Link to comment Share on other sites More sharing options...
John Blankenship Posted March 6, 2015 Report Share Posted March 6, 2015 Neither fuses nor output transformers are likely to cause the symptoms described. Considering that the output of a Hafler P3000 is direct coupled (no output transformers), it's even less likely <g>. Quote Link to comment Share on other sites More sharing options...
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