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Anonymous Posted on Sep 02, 2011

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 thump. Even without any tunes pumping out. If I bring the gain/level back down a bit, it stops. Whats wrong? I want to turn the gain/level up more to get more out of this sub and amp.

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  • Anonymous Sep 04, 2011

    Ok, that makes sense. Thanks. So with the amp and sub I listed, is that a good match or do I need a more powerful amp? In your opinion. Because I have another car that has two 10" subs and a less powerfull amp with a smaller peak and rms, and its louder than this single 12". Kind of a problem in my book :P I want it to be louder cause the sub is capable of more and I only have the gain at 45%. I was thinking it could be an issue of preamp output from the head unit too though cause the pioneer head unit I have doesn't have many options for sub output. It doesn't have any level controls or bass options for a sub. So I was curious if it couldn't be something with that too?

  • Anonymous Sep 04, 2011

    Ok, that makes sense. Thanks. So with the amp and sub I listed, is that a good match or do I need a more powerful amp? In your opinion. Because I have another car that has two 10" subs and a less powerfull amp with a smaller peak and rms, and its louder than this single 12". Kind of a problem in my book :P I want it to be louder cause the sub is capable of more and I only have the gain at 45%. I was thinking it could be an issue of preamp output from the head unit too though cause the pioneer head unit I have doesn't have many options for sub output. It doesn't have any level controls or bass options for a sub. So I was curious if it couldn't be something with that too?

  • Anonymous Sep 09, 2011

    I put the capacitor in and the problem was still occuring. So I checked my ground connection just breifly by pressing the cable tighter to the car with my hand. It practically cleared up all the thumping sound. I tried regrounding it in another place, but had the same result. I ended up using 2" of exposed cable and bolting it to the car. The ground now works great and I'm able to turn my amp up more. I have a sick system now. Thank you!

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  • Posted on Sep 03, 2011
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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.

Testimonial: "Great and helpful advise. Helped me solve my problem."

  • 1 more comment 
  • Anonymous Sep 03, 2011

    That makes sense. I talked with another guy and he told me it was because I don't have enough electricity going to the amp. Its available, just not fast enough. He said I need a capacitor. So I purchased one and we will see how it turns out once I get it installed. Does that sound logical? What do you think? The AMP and SUB info is as follows. And the SUB only has two terminals.

    SUB:

    Pioneer TS-SW3001S4
    12" Single 4 ohm Shallow-Mount Subwoofer

    • 12" Single 4 Ohm Shallow Mount Subwoofer
    • Power Handling:
    o Peak: 1500 watts
    o RMS: 400 watts
    • Impedance: Single 4 Ohm
    • Double woofer cone design
    • Air suspension control system
    • Interlaced Basalt/Carbon fiber reinforced IMPP woofer cone
    • 3-Layer fiber woven radial woofer surround with m-shape cross-section
    • Cast aluminum basket with fin-shaped design
    • Phenol resin coated glass cloth voice coil bobbin
    • Projected pole yoke with vented pole
    • 6 Layer aluminum voice coil
    • Strontium magnet construction
    • Silver spring compression wire terminals
    • Frequency response: 20-230 Hz
    • Sensitivity: 93 dB

    AMP:

    Boss NX1800.1
    1800W Max, Onyx Series Monoblock MOSFET Amplifier with Remote Level Control
    • Onyx Series Monoblock Car Amplifier
    • RMS Power Rating:
    o 4 ohms: 900 watts x 1 chan.
    • Max Power Rating:
    o 2 ohms: 1800 watts x 1 chan.
    • MOSFET PWM Power supply
    • Remote subwoofer level control
    • LED power and protection indicators
    • Variable 0 to +18dB Bass boost
    • Thermal and speaker short protection
    • Soft turn-on circuit
    • Variable gain controls
    • Line and speaker level inputs
    • Input sensitivity selector
    • Heavy duty aluminum alloy heatsink
    • Chrome RCA level inputs
    • Chrome screw terminals
    • Variable low-pass filter
    • Dimensions: 11-3/4"L x 10"W x 2-3/16"H
    • 4-gauge power and ground wiring is required for installation. Contact us for information regarding a discount on select amplifier kits when purchased together with this amplifier.

  • Anonymous Sep 04, 2011

    Capacitors are kind of a cheap trick to get a little power, it's basically just a little battery. If you are serious about getting power, you could do the big 3 upgrade. (you can find a video of how to do it on youtube). I am an MECP certified installer and I don't recommend capacitors to anyone, that's not to say that they don't have their place. But seriously, your amplifier should not be pulling that much draw. If you use a 4 guage kit, you should be good. Also, make sure you tuned your amp. You should NEVER go above 3/4 on your gain. If you do, you experience the problems you are having with the amp clipping. Alway use an amp that is more powerful than you need, that way the power will be clean and if you have a "peak" power draw, it's not going to hesitate. If you are going to use a capacitor, get a good one. Digital caps are better than just standard. Hope this helps, and good luck

  • Anonymous Sep 04, 2011

    Ok, that makes sense. Thanks. So with the amp and sub I listed, is that a good match or do I need a more powerful amp? In your opinion. Because I have another car that has two 10" subs and a less powerfull amp with a smaller peak and rms, and its louder than this single 12". Kind of a problem in my book :P I want it to be louder cause the sub is capable of more and I only have the gain at 45%. I was thinking it could be an issue of preamp output from the head unit too though cause the pioneer head unit I have doesn't have many options for sub output. It doesn't have any level controls or bass options for a sub. So I was curious if it couldn't be something with that too?

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I have 2 12in kenwoods and a 1200 watt pyrimade amp, how can i hook these up to be the loudest

1st have your subs facing inwards towards the front of the car, not facing out the boot, This creates a better bass.

Wire 1 sub to one channel and the other sub to the other channel.

Turn down your gain as low as possible and then power everything up.

turn volume to desired loudness and then start turning up the gain slowly, if distorts a little turn in back down a notch.

avoid using bass boost, I agree it sounds great but it puts more strain on your amp and shortens its life.

after sorting out your gain, tweak all others until sound is bassy and clear with no distortion.

If you would like to use bass boost, turn on bass boost first, then up your gain etc.
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I have my amp hooked up perfectly, but why won't it work? is there a re-set or somthing? i checked fuses and everything

Unlike the stereo unit, amps doesn't have a reset button.

Check the fuse in your hood.
Check all wiring, especially the ground to chassis.
Check for voltages, remote turn on should have 12V to ground and power cable should have around 12 to 14 volts.
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Just hooked up mtx 500d mono amp and 12 inch sub worked for a 1/2 hour then sub quite and led on top of amp just flashes.

either ur ohm load is way off ur pos n neg might be touchin or more than likely u blew u sub is it scratchy when u push in the middle of the cone ? does it push in at all?
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Just hooked up mtx 500d mono amp and 12 inch sub worked for a 1/2 hour then sub quite and led on top of amp just flashes.

Your amp went in to power protect. You must adjust the settings on amp. This is usually very time consuming to get it right. Good Luck
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wire the subs if thair dual 4 ohm . in parallel. red to red and black to black. giving it a 2ohm load. do the other sub the same. and conect it on the amp . turn your gain about 12oclock and db level less than 12oclock and your frequnecy around 80-100. and that should work
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NO SOUND OUT OF SUB WOOFERS I AM GETTING POWER TO THE AMP

the easiest thing to do is check the voltage at the amp, between the red power wire and the black it should be the same as the voltage across your battery under the hood. now turn your radio on and c heck the remote turn on wire this wire is at the amp and is usually blue it should have 12 volt when the radio is on and 0 volts whe the radio is turned off check between the blue remote wire and the black ground wire unhook subs from amp and check the resistance across the speaker terminals with a digital mutimeter, if your subs are 4 ohms then your reading on the meter should be around 4, if it is close to 1 or 0, then it's probibly your subs. if everything is good check the fuse on the amp
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Amp turns off

what ohm is it running at? if you have all three hook up it parallel then its to low of ohms and it would be louder if you unhook your 10" sub as it moves differently form the 12"s and it cancels out some bass. but if you want it then you have to change the wiring around a bit. take the positive wire off a 12 and put it on the positive side of the 10 and then take the ground for the 10 and hook it up to the positive side of the 12. so you should have one wire from the amp going to the negative side of the 12 and one going to the positive side of the 10 and a jumper wire from the 10 to the 12. and if it still shuts off then you have bigger problems.
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You must break it down through a process of eliminating items. With the system running unplug the RCAs from the amp. Do you still hear the noise? Try turning the gain down on the amp a bit and increasing the subwoofer level on the head unit instead. Make sure you have a low pass crossover set (probably below 80Hz).
Does the noise change with engine RPM?
Try a different RCA cable. I find that most times noise filters will make the problem worse not better. If none of the above things work, check that the grounds within the car are good, battery to frame, to engine block and chassis. Sometimes a bad vehicle ground is the cause. If all else fails, hook it up to someone else's system and see how it works.
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