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Class D Switching Power Amplifiers and Power D/A conversion

Boss NXD3500 car amplifier hooked to an Onkyo 7.2ch home amplifier
Boss NXD3500 car amplifier hooked to an Onkyo 7.2ch home amplifier
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Old 20th August 2016, 12:57 AM   #1
Evolver is offline Evolver
diyAudio Member
Join Date: Aug 2016
Default Boss NXD3500 car amplifier hooked to an Onkyo 7.2ch home amplifier

Well Hello, im new here so please dont make fun of me, I have a Boss NXD3500 mono class D amp hooked to a Pioneer 1000w subwoofer that I removed of my car due to space limitations and the problem of that huge sound.

So now I have it installed in a room with an Onkyo amp, I made a rig with a car battery and a UPS so it can recharge the battery and 3 relays so when the amp turns on the UPS turns off and vice versa (That was made due to interference when charging the battery and the amp turned on)

First, I wanted a house amplifier for my subwoofer but didnt find any.

My problem is:

I cant have too much time out of my battery (it dies) and my UPS cant recharge it fast enough, so I was thinking of those 30a 12v dc power supplys used for LEDs, but when I hook a 12v power supply to the BOSS amp I get a hiss out of the subwoofer.

Anyone knows a hint on what can I do to remove the hiss? a diode? a proper power supply for the amp?

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Old 13th March 2020, 10:48 AM   #2
nmiller70392 is offline nmiller70392  United States
diyAudio Member
Join Date: Jan 2020
Location: louisiana
Default reply

Hey first of all that's really cool that's something i would have done when i was a lil younger. about your hiss i would look on ebay for a 100 amp switch mode power supply to charge that battery or even run the amp by itself i have one i bought to work on car amplifiers also have charged a few batteries with it. you can also try a rca line ground loop isolation transformer on the rca inputs to your amp you can find those at walmart usually in the car audio section and are cheap. really like what you did there
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