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Old 20th April 2008, 01:14 PM   #1
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Default Audiobahn A12001DQ thudding

This amp had a blown out the IRFZ44N pieces when i replaced those the amp works great now. My problem is when you take power away from the remote turn on wire the subs put out a loud quick thud or pop. What would cause something like this to happen? is it in the power or preamp section of the amp and what should i do to fix it?
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Old 20th April 2008, 01:22 PM   #2
Dan2 is offline Dan2  South Africa
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did it do that before you replaced those other parts??

usually the thud is the power supply caps discharging, and the quickest way to get rid of that is hooking a relay up between the amp output and the speaker, and hook that up to the remote wire (if its a 12V relay)

look around in the car audio section - there's more info there
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Old 20th April 2008, 04:16 PM   #3
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Generally, the muting circuit prevents the amp from popping. Many of the class D amps use relays for muting. If this amp uses a relay and the relay isn't opening quickly enough, that could cause the amp to pop.

You can hear most relays click when they open and close. The relay should click approximately 5 seconds after remote voltage is applied and should click as soon as you remove remote voltage (no delay). If it isn't clicking as soon as you remove remote voltage, the drive circuit for the relay is likely damaged.
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Old 20th April 2008, 04:21 PM   #4
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Perry can you show me with your photos on any amp what the relay looks like? and what drives them?
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Old 20th April 2008, 04:37 PM   #5
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It's the black box in the corner in the photo below.

The drive circuits vary. If there's a diode near the relay, it's likely across the relay coil. You can measure the voltage across the diode to determine if the voltage is being switched on/off as it should be.
Attached Images
File Type: gif p7020001b.gif (86.1 KB, 165 views)
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Old 20th April 2008, 06:39 PM   #6
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Perry thanks for the photo could i be wrong saying that i dont believe mine has a relay?
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Old 20th April 2008, 06:47 PM   #7
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Not all have relays. I can't find any internal photos of the DQ version. If you can send me a good quality photo of the internals, I'll see if I can provide more information.

babin_perry@yahoo.com
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Old 23rd April 2008, 07:28 PM   #8
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Perry i will get photos for you if you were interested i just decided that im not going to fix it. I removed all the stereo equipment from my car so ino longer need help with it.
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Old 23rd April 2008, 09:00 PM   #9
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I'd like to have the photos. If you send them, please zip them to files less than 10megs each. Yahoo mail can't handle more than that on incoming email.
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Old 29th June 2008, 10:46 PM   #10
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Perry I decided I need to fix it. here are some ok pics i cant get a better camera at the moment

http://s227.photobucket.com/albums/d...er592/A1200DQ/
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