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Re: HOW TO CONNECT SUB WOOFER IN 4CH CAR AMP
Sounds like you need another amp, if the amp has a speaker already connected to each channel, you have no open channel to connect a sub-woofer.
Some years ago I seen an amplifier that was designed to use 3 speakers on 2 channels. what they did was had a speaker on each channel and then they bridged the 3rd speaker across it. That amplifier was designed for this configuration, unless you have an amplifier like that you should not try it. It may result in smoke from the amp.
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First of all.
Using two different kinds of sub woofers, is not an option, as these two sub woofers have different specifications and you should never mix sub woofers.
Now the better choice from the 2, would probably be the Rockford. (cant be sure without knowing the models, power handling is also a factor in how well either of the sub woofers will play, but Rockford as a rule makes better sub woofers than Sony does)
In my opinion, both the sub woofers deserve a better amplifier than what Boss has to offer.
However to connect either of these sub woofers, you would need to determine how many voice coils it has and how many OHM the voice coil/s are.
If it is a DVC (dual voice coil) and each voice coil is 4 OHM or 2 OHM, then you can connect one voice coil to one channel of the amplifier and the other voice coil to the other channel of the amplifier. If it is a DVC 2OHM you can also connect it wired in Series/Series to give a 4OHM load and should be connected to the BRIDGE dedicated speaker outputs of your amplifier.
If it is a SVC (single voice coil) and it is 4 OHM, then you can connect the sub woofer to the designated speaker outputs of your amplifier that states BRIDGE.
DO NOT run the amplifier in BRIDGE mode at 2 OHM as this will probably damage the amplifier.
My advice would be to connect the front speakers and the sub woofer to the amplifier and run the remaining rear 2 speakers from the headunit. This way you dont stress the amplifier to run on two different loads at the same time and still maintane control over your system. Bridge your sub woofer on chanel 3&4 and do not forget to set the LPF for chanel 3&4. If your speakers are not components in the front set the HPF on chanel 1&2 to roughly 60 to 80 Htz.
If you are getting power to the amp, try this....Find a small speaker, unhook your sub and wire speaker to amp. Turn on your system at a low volume....If the other speaker is playing through amp, then your sub is shot.....If the small speaker doesnt work, then its either your channel is gone on the amp or the rcas have quit off off your head unit.
The sub woofer can be connected by bridging one side of the right channel to the other side of the left channel. Usually this will be marked on the speaker connection terminal and use will not have any trouble to locate. If not use the + ve of the right and the - ve of the left to connect to the sub woofer. turn it on and check . If you find the phase different- with less bass- reverse the connection and try. this will work fine. Good day
Use the left and right to connect the positive and negative to the respective speakers in the right and left. Please make sure of the polarity and so be cautious. next you can connect the sub woofer from the left and right channel as the amp is bridgeable. Use the lead to connect from the R- positve to L negative. test and check the phasing of the speakers, must get good low bass or else you can reverse the sub woofer and check again. If you ae having frint speakers connect accordingly the the other channel. Helpful Good day
You can download the installation manual from the link below:
It has the following diagram plus other hookup info...
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