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No sound from sub- I got a green power light and everything is hooked up right- no sound not even the slight thump when you turn it on. What should I do? It is the f series servo velodyne made back in 1996

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Sounds like you have lost the thing that does the amplifaction. Look inside see if you can see something perhaps on an heatsink, I think it will have gone, but it's just a hunch!

Posted on Sep 11, 2009

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1 Answer

JBL PB12 will have loud thump or pop!


First try to find the source of your problem. The easiest way would be to try your sub with a different audio source to see if the problem still occurs but is sounds more like there's a problem with the receiver.

Oct 18, 2012 | JBL PB12 Subwoofer

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I have a mono amplifier hooked up to a 12 inch sub. I have everything hooked up. The ground is good. However, when I turn the gain/level up to around 55% the sub starts thumping loudly. Just a rhythmic...


There are a few things you can look at. Check to make sure you power is at a constant 12 volts. Usually a dip in voltage will set off a protection mode, but it protection is malfunctioning, this may be occuring. You also may need a larger guage wire for power and ground, depending on how many amps your amplifier is drawing. You subwoofer may be the problem too. Is it a dual 4 ohm, or dual 2 ohm? If it's dual 2 ohm and your amp isnt' one ohm stable, this could be causing the amp to overload. From your description it sounds like the amp is "clipping", so my gut tells me it's more of a power problem. Recheck all your wiring. If you have a multimeter to check your power, use it. Good luck.

Sep 02, 2011 | Car Audio & Video

1 Answer

Sony Xplod Amplifier Problem


First make sure you are using at least a 12 guage speaker wire for sub connections. Second make sure you have plenty of breathing room in your mounting position, these things need air badly. Third of all, Xplods are not very friendly if they are cranked all the way up on your dB boost knob. Only crank it about 3/4 of the way up, then use your equalizer settings to tweak the thump.

Oct 20, 2009 | Sony Xplod XM-554ZR Car Audio Amplifier

1 Answer

The light comes on but little sound comes out


theres a chance you may have blown up the amp. never put a sub that is to strong for the amp because its pushing all of the energy out of the amp to power up the sub, causing the amp to blow a fuse or the channels, on the back there is control of frequency turn everything all the way up to see if you can even get it to thump hard but dont blow your sub if it pops turn down some stuff and check the head unit to where its fading to the front or rear and balance to left or right

Jul 27, 2009 | Legacy LA1478 Car Amp

1 Answer

Sub making horrible thumping garbage sounds


you need an noise filter in line. It's been a few years since I've had a system but I had the same problem. High power amps like the one you have can actually pick up on the electric pulses from your ignition system. I think I got mine at walmart, or auto zone, somewhere like that. Their pretty cheap too. I don't remember how its hooked up, but If you know how to hook and amp up, this should be no problem.

Jun 23, 2009 | Hifonics Zeus Z400 Car Audio Amplifier

2 Answers

My subs don't bump to the beat, they just go THUMP THUMP THUMP...


It sounds like you need to ask for pro help mate, mybe the amp just needs setting properly, Is the amp on bypass for bass, or does the amp run the complete system

Jun 13, 2009 | Cadence TXA 750D High Power Mono Amplifier...

1 Answer

Poor sound/ Unable to play anything load without distortion.


i can tell you right now base on the vehicle you have a bad system hook wosrt if you are using factory head unit

Mar 25, 2009 | Kenwood KAC-8151D Car Audio Amplifier

1 Answer

Car audio


hi, your amp seems to be getting power but the cables might be wrong so it's not getting enough power. the light on the amp should be green if everything is going well. are you sure the cables are suitable for your amp?

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3 Answers

Red LED "Protection Light is on" What is the problem


The red light means the amp is in protection mode. A few things can cause protection mode..... First disconnect the subs completely from the amp, and turn it on, if it powers up you have blown subs. Also try checking the main power wire at the battery...sometimes the current your meter is seeing is backfeeding from the remote wire, so your main power line could be blown at the fuse under the hood. hope this helps

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