Hifonics BRZ2400.1D No Output...Used to be in Protect - Page 3 - diyAudio
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Old 30th July 2012, 12:41 AM   #21
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A lot of these amps don't have synchronized oscillators (power supply and output) and will cause noise to be generated but it generally has a changing pitch.

Does the amp have any engine noise when installed in the vehicle?
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Old 30th July 2012, 12:48 AM   #22
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Well the sound is not a straight frequency tone. There is a very little variation in tone if you put your ear in the speaker. If you walk away you don't realize it. I can try to make a video/sound clip of it as I turn it off and turn it on if my mic can pic it up.

But I am a little curious why it's making the noise because before the amp blew, it never made that type of noise when I used the same testing equipment.

I will install in the car right now and see what happens. For testing, I was using a battery that was sitting around playing low power with battery at 11.9 volts
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Old 30th July 2012, 01:41 AM   #23
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I just finished hooking it up in my car and the sound wasn't there at all and I pushed the amp hard and did not go into protect! Weird how my test bench produced a sound. I will throw it in my other vehicle and confirm. Thank you so much Perry! I will come back if something goes wrong.
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Old 2nd October 2012, 01:52 AM   #24
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So I had thought that I fixed my amp but a week ago I went ahead and installed it for the first time since the repair and it plays but goes into protect regardless low/medium/high volumes. I haven't opened the amp yet but I was wondering if you think my driver board has bad transistors like you mentioned in the earlier posts?
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Old 3rd October 2012, 12:48 AM   #25
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I opened the amp and all fets on the sides are good. I hooked it up on my test bench with my two 8 inch subwoofers at 4 ohms using RCA to 3.5mm audio jack. I was pplaying the amp as loud as my subs can take it which I clamped out about 300 watts going to the subs.

Weird thing is that I am playing it moderately for long periods of time and it never went into protect. But when I play it in my car it goes into protect at low moderate levels...Does it have to do with the Driver board and/or the fact that my head unit is giving the amp 4 volts preout? Please let me know.
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Old 3rd October 2012, 12:49 AM   #26
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Are you running it at 4 ohms in the car?
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Old 3rd October 2012, 12:51 AM   #27
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The car is running at 2 ohms.
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Old 3rd October 2012, 01:13 AM   #28
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If the test conditions are not precisely the same as they are in the car, you may not be able to troubleshoot the fault.
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Old 3rd October 2012, 01:37 AM   #29
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Very valid point. When I get the time, I will open my box and wire up one of my subs to test at 4 ohms along with the signal input having a preamp voltage and test it without preamp voltage. I'll report back after I did some tests.
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