Question about Sony XM-2150GSX Car Audio Amplifier

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Amp powers on but sub does not come on

I have an 8" sub woofer hooked up to a small amp. The amp powers on but the sub will not make any sound. The terminals for the sub wires that go into the amp and to the sub have not changed and are in the right location. The remote wire (spliced into the remote wire from the head unit)has also not been changed and and sub woofer feature on my head unit is on. The funny thing is that it used to work just fine. But ever since I changed the battery terminal to a gold plated one with an axillary hook up for the amp power wire, the sub has not worked. Everything is tightly connected. What could be the problem?

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  • devsidell Feb 10, 2009

    Thanks for the reply! I actually figured it out with some help of a voltmeter. It turns out the the ground wire was disconnected from the negative terminal on the battery. Lol. Thats why the amp was receiving a signal but not able to send one to the sub.

  • Anonymous Apr 27, 2009

    Hi i have a JVC head unit with DUB single channel mono block running a boxed and ported twin 12' sub box,

    Now the problem is all is turning on as it should be amp turns on with head unit and off again but there is no sound comming from subs at all,this is the strange part iv had it for very short time so took it back to shop and all works fine go figure.

    Have even connected head unti straight to battery and no change it seems to be something to do with RCAs or something although iv tryed like three brand new set and nothing,in the car anyways....PLEASE HELP ME.

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I would double-check your RCA's on the amplifier. You should hear a thud if you unplug them. If not they are either not hooked up or defective.

Posted on Feb 08, 2009

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I have a subwoofer can i hook up to computer speakers


Yes you can. cut the left speaker lead and splice a wire from it to your sub woofer. If its a powered woofer you may have too much gain going in, You don't say what kind of sub it is or weather or not its a "powered" unit. If its a powered woofer (built in amp) you should take the output directly from the computer output (buy a 1/8 in male to 2 1/8 in female connector, send one output to your original speakers and the left side of the second output to the sub woofer. you can usually adjust the level of the sub (if powered) with a control on the unit. if you need more help, contact me but please tell me more about what you have.

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I have a power acoustik 0V4-1200 amp and 2-12" kicker cvr dual 2 ohms. My amp keeps getting really hot and turning off. I have two pair of rca jacks from my cd player to the amp. One speaker hooked up...


i have found the specs to your amp. 1. Amplifier connections: Lets make things simple. As we look at the amplifier speaker connections, we will number the outputs 1 2 3 4 from left to right for the top connections and again 5 6 7 8 from left to right for the bottom connections. 1 should be connected to a positive (RED) (+) on sub woofer A on voice coil (a) 4 should be connected to a negative (BLACK) (-) on sub woofer A on voice coil (b) Now using a small piece of cable, connect negative of voice coil (a) to positive of voice coil (b) Follow the same procedure for the other sub woofer using 5 and 8 as 1 and 4 This configuration should make the amp run at 4 OHM BRIDGED x 2. i hope this helps. dreamsystems

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Just got two AR 312 HO speakers from my brother. I have a Yamaha HTR 6250. The speakers have (2) sets of cable hook up. One I assume is for built in sub woofers? Do I hook one normal and one to the sub...


do not use those speakers with that amp, those are 4 ohm speakers, which could damage your 8 ohm yamaha amp. you will have to get a 4 ohm capable amp to run the highs, and another 4 ohm amp to run the subs.

car amplifiers are currently 4 ohm, or even 2/1 ohm stable, but few, if any modern receivers can run at anything lower than 8 ohms without a danger of overheating. you may have to get a vintage amp(s), like a 1970's marantz receiver, or a 1980's to early 1990's kenwood power amp, because 4 ohm home amps are pretty scarce nowadays.

whatever amp(s)( you get, verify that they are DEFINITELY 4 ohm stable.

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Sub woofer


You are suppose to hook subs up to a amp.

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How do I hook up a non powered sub woofer on my htr-5630?


You will need an amplifier or 2 channel receiver. Hook the sub out rca jack to the rca inputs on this new amp or receiver and hook the speaker terminals on sub to speaker terminals on same amp or receiver. Your Yamaha receiver doesn't have any power for a passive sub.Just pick up any old fairly high powered receiver for fifty dollars and you're good to go.I use old dolby pro logic receivers as they are a dime a dozen today. Good luck.

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Ohm calculations; 4 and 8 ohm sub woofer?


+ output from amp to + input of 4 ohm to + input of 8 ohm AND - output from amp to - input of 4 ohm to - input of 8 ohm is a parallel circuit = 2.66 ohm impedance load for amp
+ output from amp to + on 4 ohm - on 4 ohm to + on 8 ohm - on 8 ohm to - of power amp is a series circuit = 12 ohm impedance load for amp. Clear as mud??
Clear as mud?

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Could a ground stop your woofer from working?


First check the speaker wire from the amp to the sub, see if it's connected right. Second check the rca cables that goes from your amp to the back of the deck. I f both wires are still connected fine try to replace the rca cables. If it still doesn't work the rear out put at the back of your deck, where the rca's are connected are bad. FYI deck is bad.

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Can i wire 3 jbl gto1204d subs into 1 jl audio 500/1 amp


You can connect them in a series/parallel configuration. Put two of them in series and then connect the last one in parallel across the two in series. This would give you an impeadance of around 2.7 ohms. Only do this if your amp is stable at 3 ohms or less. I am not familiar with the specs of your amp. If your amp is only 4 ohm stable you can not do this.
This would also give you half the power on the two subs in series as the power for the one that is parallel. The two in series would be sharing the total output signal, where-as the one in parallel would get the entire output signal from the amp.
if you were to connect a fourth sub woofer in this configuration it could give you a 4 ohm load, by adding the fourth sub in series with the single sub that is in parallel. or in other words, yu have two sets of 2 sub woofers each in series. That gives you two 8 ohm loads (two 4 ohm subs in series is 8 ohms). Then you take the two sets of subs and parallel them (two 8 ohm loads in parallel equals 4 ohms).

If i had a picture to show you it would make sense, two subs in series that are in parallel with two subs in series.

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