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Want to bridge 2 channel amp to push single 4 ohm dvc sub

I have a sony xplod 1200 watt bridgeable 2 channel amp. I want to run a single hollywood excursion 15 inch subwoofer with as little impedance as possible. the sub is rated `at 1000 rms, 3000 peak. it is a 4 ohm dvc. Wiring diagrams on crutchfield.com show me to run + from channel 1 to + on vc 1 and - from channel 2 to - on vc 2 and connect - on vc 1 to + on vc 2. this will produce a single 8 ohm load on the amp. But my amp will only push an RMS of about 250 watts with this impedance. Is there a way i can wire it to produce less impedance without damaging my equipment?

I.e. instead of running a wire from vc1 - to vc2 +, can i wire the VC's in parallel? can i run each VC seperately off of each channel? can i do anything to reduce impedance?

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Hello k_rabbit89,

A 4 ohm DVC sub can be wired in series like you described for an 8 ohm load or the voice coils can be wired in parallel for a 2 ohm load.

If your 2-channel amp isn't stable down to 2 ohms when the channels are bridged (most 2-channel amps are only stable to 4 ohms when bridged), you do not want the voice coils paralleled. The amp will overheat, go into protection mode, and eventually fail completely. A sub with 2 ohm voice coils would be a better fit. That way, you could series the coils for a 4 ohm load and the amp would operate OK with the channels bridged into that load.

But anyway, for the best power from THAT amp to THAT sub, your best wiring solution would be to wire each voice coil to a separate channel. The problem with that is that the signal to each coil needs to be EXACTLY the same or you will have one coil trying to move the cone out while the other one tries to move it in. You can closely approximate identical signals on the output side by using the same input to both channels. Do this by using only one RCA connection (either right or left channel) from your head unit and split it with a "Y" cable.

Hope this helps.

Posted on Sep 13, 2009

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1 Answer

Amp going into protection


Is the amp bridged? If you only have one speaker connected to it, I sure hope so. How much power can that speaker safely handle and what is the impedance of the speaker? 2,4,8 ohm? A 1200 watt amp with only one speaker may be too much amp.

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Ive got an sony xplod 1200 watt amp thats bridgeable ive got two dual 4ohm subwoofers how do i wire this up to get the countinued bass with no cutting off


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sounds as though (at high volumes) the amp thinks it has a short circuit. This may be caused by the way you have them connected.
Speakers have a resistance and amps needs a certain amount of resistance to function right (too little resistance = short circuit)
The way it works out for the speakers is, if the two are connected to one amp output channel, the amp will see half of the resistance of a single sub. (4 Ohms/sub amp sees 2 Ohms)
If the amp instructions say that it's 4 Ohms/channel then you need to use 1 channel for each sub.
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Is the sony xplod cdx-gt71w able to support a subwoofer without another amp


Sure is.

The sony is bridgable as follows:

  • 100W x 4 @ 4 Ohm
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  • This will allow 2 channels to run 100 watts each @ 4ohms with an additional single channel with 250 watts @ 4 ohms.


    The single sub channel is created by bridging channels 3 & 4

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    I have two sony xplod 12" speakers wich can hold


    You only gave us the model of the amp so I will make an assumption that your 12" subs are the Sony XS-GTX120LW. First, they cannot hold 1200 watts a piece. They are meant to be powered with 350 watts RMS. They will hold 1200 watts peak. That means that 1200 watts for a few seconds will be ok. Past that and kiss them goodbye!

    Next you indicated that bridged the amp. Since the subs are both 4 ohm single voice coils did you wire them in series or parallel?

    It sounds to me like you wired them in parallel resulting in the amp seeing a 2 ohm load. The amp you referenced is only stable when bridged at 4 ohms.

    Has the amp begun working again once it cooled down? If not you could have fried the outputs by having the resistance too low.

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    impedance mismatch cud be the culprit. make sure ur speakers are the right ohms for ur amp. most amps are designed to operate on a 4 ohms speaker load on bridge mode. some amps are never designed for bridge mode. so if u bridge these amps u will get less output. u have to be very careful when u make the connections. plus when u bridge two amps for 4 ohms load, the total impedance becomes 8 ohms. make sure ur speakers are 8 ohms. few ohms can make big difference on power amps.

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    Settings for a Sony Xplod 1200 watt amp, with two 12 inch subs


    What kind of subs are you running? Meaning what brand, what are the ohm, spl and wattage? I'll look up your amp while you get that info to me. Looking forward to helping you:) Thanks!

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    Sony xplod 500w 4/3 channel


    If the speaker is a 4 ohm DVC (two 4 ohm coils), you can't wire it to get a single 4 ohm load. Try connecting one coil to each of the two rear channels. It may not be as loud but the amp should operate without going into protection.

    If the two 4 ohm coils are in parallel, the amp is driving a 2 ohm mono load. That's probably why it's shutting down.

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