Question about JBL PB10 Subwoofer

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Sub and amp problem

Ok my amp is getting power but my subs arent ive checked the wiring it looks ok but im thinking it could be the rca cables i was wondering if there is anything else i can check ?? im dying here i hate music with no base heeeeeeeeeeeellllp!!!!!!!!!!!!!

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  • Anonymous Jan 04, 2009

    I have to unplug and replug the 120 volt cable to get the led's to turn green. Doesn't work all the time.

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  • 57 Answers

You should get power even without the RCA cable.

I believe you should take time and check your connection.
please use the right cable for your sub. you need the right cable
to boost the sub. Check radio shark or Sam Ask for better sub cable.The better one don't come with your system.

Good luck

Posted on Jul 24, 2008

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Posted on Jan 02, 2017

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Ive got a kenwood kvt-512 n im tryin to hook an amp n subs up but dnt know where to plug my RCA jacks from the amp 2 the radio!


Your unit should have 2 plugs in the back...one for the audio and power wires to connect to your factory connections and the other plug is just RCA connections for your video, subs and front speakers. If you have a 4 channel amp and a amp for your subs, you will have to split the 4 channel amp down to 2 and run them to your front RCA connections. Subs will connect to the sub connections. If yours are not listed then you may have to track down a wiring diagram. Hope this helps.

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Usually dont use 2 amps for 2 subs you can run 1 amp and two subs which is more common. But what i need to know is which cables if you are talking power cables or rca cables. If Rca then then go ahead wire together. Power is a different story and I need to know what you are pushing

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How do i check if my amp is still good?


first make sure that you have power check the red thick wire, and the remote wire with a voltmeter if its ok then disconect the rca plugs now get a pair of rca wires plug one end to the amp and touch the other end if it makes noise your amp is good ( please be very carefull as it will make a loud noise on the speakers when you touch the other end if the amp is good) good luck

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1 Answer

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  • Although most of my background is in car audio & acoustics, I did have a thought or two about some tests you can do.

DO THIS AT YOUR OWN RISK OF ELECTROCUTION - Have you tried checking the speaker terminals with a voltmeter while the unit is plugged in? I,ve seen solid state amps (both car & home amps do this) kind of lock up and send constant line voltage to the sub. In some cases the sub snaps instantly, high power subs may not. I've used power from a 110v wall outlet to show off some high SPL systems I've built (very painful 60hz earthquakes). So be careful at the sub terminal it may have some voltage at it.-(If it does you probably know the rest of my answer.)- If so the sub will most likely be wasted and fused voice coils are also common when this happens.
If everything checks out okay there (make sure to check if the subs resistance is at spec while you're there) use the voltmeter and start poking around the audio side of things both on the powered sub and RCA's. You may even find a easy problem on RCA cables. Also can/did you plug the RCA's into a known source, to check their output. Most home audio is 1.5v max but some can go as high as 8v max or so. Also don't be afraid to check the simplest of items like source buttons, specifically the tape monitor buttons. My equipment has these such tape functions with little or no indication as to weather or not they are active, and not being plugged into anything you get no sound. I hope I gave some idea's you may not have tried, your fellow Audiophile-
-Dynami

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My amp was bad so i replaced it now my sub does not work i checked the wiring that goes from the amp to the speaker and everything seem to be ok then i put another speaker thinking it might be the sub and...


It doesn't sound like the wiring from amp to sub is your problem.

Is your amp getting a power light ?
Are you sure your remote wire is hooked up properly ?
Check both ends of your RCA cables

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This is a multi-tiered question. First of all, you're going to want to run the subs at a 2ohm load (if the amp is capable) to get the maximum power from it. Use the 5.0.1 for the subs only, that's what it's designed for. Run the cap in conjunction with only the sub amp as it has the largest power requirement. You can not link the two amps to increase output as they are first of all different amps and second of all not designed to run that way. Some amps are but they must be identical.
Set the crossover on the sub amp probably no higher than 80Hz (I like it lower than that but that's a personal preference) and turn the sub-sonic filter off.
Now, one of the most important things about a subwoofer is it's encosure. If it's a properly built box designed for your subs specifically then you should be ok. You dont' specify if it's ported or sealed etc. That would be helpful to know as well as it's approximate size (air volume).
The head unit can also have some bearing on how things sound, as I recall the Sony X-Plod units are fairly decent for the price and if set up properly should sound ok.

If you need further assistance please provide a little more info about the sub enclosure etc.

good luck!

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1 Answer

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Is the amp being fed directly from the head unit's RCA preamp outputs or is it being fed by another amp's preamp outputs? Try temporarily wiring up a speaker you know is good in place of the sub and see if anything changes.

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