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#1
02-23-2006, 02:11 PM
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Sub Thumps when I turn radio On/OFF
Sup guys,
First off let me say that I did a search prior to posting and although I did find several post's, some were old, some weren't relative and on some I had already done what what the responders of those post's recommended. This isnt anything new but I own a Alphasonik PMZ12005A 1200W amp and every time I powere on/off the radio the sub makes this annoying thump. I know it doesn't mess anything up, but it's really annoying. I tried regrounding both my Pioneer head unit as well as my amp, Played around with the RCA's and nothing. I understand they sell some kind of filter but dont know if it's really worth purchasing or where to buy it. Can you guys give me some helpful advice, it would be greatly appreciated. Thanks
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99 Eclipse Spyder GS 
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#2
02-23-2006, 02:39 PM
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Re: Sub Thumps when I turn radio On/OFF
Did it just start doing it or has it done it for a while?
__________________
 2004 Flame Red SRT-4 |Audiobahn 1200Q|Rockford 602s|Jensen flip out dvd| Mods: 
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#4
02-23-2006, 03:36 PM
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Re: Sub Thumps when I turn radio On/OFF
Back in the day when I had my Tercel, with this one really shitty amp I had I would always get this whinning sound as if it was coming from the alternator. Well I bought the lower quality noise filter then the higher quality one and both of them did nothing for the amp but it turned out that the problem was the amp. But as for your issue, It seems like alot of stereo set ups do that thump sound your referring to and I've always thought that it was normal. Let me know if you do go the route of the noise filter, if it works or not.
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#5
02-23-2006, 05:02 PM
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Re: Sub Thumps when I turn radio On/OFF
my alpine amp does that too.. i think its a normal on power test
__________________
08 Kawasaki Ninja 250R - Plasma Candy Blue 07 Toyota Rav4 - Ltd Ed. 6 Cyl AWD 97 Mitsu Eclipse Spyder GS-T 5 Speed
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#6
02-23-2006, 05:18 PM
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Re: Sub Thumps when I turn radio On/OFF
My Orion amp doesnt do that.
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Caleb vanilla gorilla '99 Spyder 2.4 5-speed - Red/black,14b,slow '96 Eclipse GST 5-speed - Paint www.myspace.com/ballsoutperformance
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#7
02-23-2006, 05:38 PM
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Re: Sub Thumps when I turn radio On/OFF
It's normal. Some amps have a soft turn on and some don't. It won't hurt a thing.
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 96 GST 5 spd.......(R.I.P.) smashed by a fallen tree 2001 Camaro SS 6 speed goodness!
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#8
02-23-2006, 06:06 PM
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Re: Sub Thumps when I turn radio On/OFF
yea, it is perfectly normal
__________________
98 Eclipse GS Turbo Megasquirt 2 - Holset HY35 Turbo - Built motor - P&P Head and Intake - 3" Turbo back - FMIC - Greddy RZ BOV - Walbro 255 - Aeromotive AFPR - 650cc Injectors - Fidanza Flywheel - Zoom clutch - 13" Cobra Front Brakes - AEM WB - Devilsown meth injection - 3.55 Final Drive gear ratio 1981 Chevy Scottsdale 1987 Nissan 300zx - Chump Car 2001 BMW 325i - DD
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#9
02-23-2006, 07:50 PM
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Re: Sub Thumps when I turn radio On/OFF
Yea, I know it's normal for some amps to do that and also that it won't hurt anything. It's just annoying as hell, not to mention it scare's the shit out of my lil 5 yr old son when he's in the back seat. lol.
I remember reading some where that they sell some kinda of On/Off filter. Just wondered if you guys have experienced the same thing with your amps and if you did anything to resolve it.
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99 Eclipse Spyder GS
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#10
02-24-2006, 08:56 AM
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Re: Sub Thumps when I turn radio On/OFF
Sup guys,
I just got this from one of the other forums. I'll be giving it a shot this weekend. http://www.partsexpress.com/resources/relays.html
__________________
99 Eclipse Spyder GS
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