I've just got a JBL gto 7001 Amplifier, which is Mono, but has 2 speakers connections, I have 2 12" subs with single 4 Ohm voice coils, but i want the Amp to see a 2 Ohm load, do I connect 1 sub to each speaker out on the Amp ?, or bridge the 2 speaker channel outs, from the Amp ???
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Re: JBL Sub Amp Wiring Please
It seems rather redundant to bridge a mono amp. Unless the instruction manual states otherwise, i would assume that one speaker output is identical to the other (ran in parallel, like an A or B speaker, not like Left or Right), and you would present the amp with a two ohm load by wiring one speaker to each output. Bridging it may or may not work, but, again, it just seems redundant.
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Connect front the sub out (single) on the amp to one of the rca inputs on the sub, This will work reasonably well but to make the most from the sub buy a 2 rca to 1 rca cable and use it to connect both rca inputs on the sub to the single output on the amp
It is confusing with the 4 channels it gives you but you really only need to connect it to one or the other positive and negative terminals. The amps channel setup looks like this + - + - . You can connect to the first positive and negative, the second, or combine them. I had mine installed by a professional which is how I know. Also if you want to run your amp at 2 ohms then connect the subs voice coils in a parallel circuit which means that all positives are connected to each other and the same goes for the negatives. it should match the impedances of both sub and amp. Hope this helps!
You will not be able to get the full power from the amp without ruining your sub. The amp puts out full power into a 2 ohm load so option -A- is to just run one coil off the sub and it will absolutely pound -until you roast the coil.Then you can use the other coil and roast that one too. But since you do not want to roast anything-first thing to do is take it to the store and trade it in for a dual 4 ohm sub-wire the coils in parallel and there's your 2 ohm load to achieve max power from the amp. Problem there is that you will have WAY too much power for the sub to handle and you'll blow it anyways (in time).Best thing you can do is get an identical sub(dual 2-ohm) wire the coils in series which will make them 4 ohms per sub then parallel the subs to get back down to 2 ohms overall-you get max power from the amp and hopefully enough speaker to handle it.Hope that helps.
If the amp is 1200 watts at 2 ohm stable you will want to set up the speakers as parrallel and bridge the amp. That means conncect the speakers with + to + and - to -. Look at the amp connections. Usually thereare connects that look like this:
+ - + -
If yours look like this use the diagram on top. You will use the + for the left ouput on the amp to the right - on the amp. This will allow you to use all the power from the amp. Be sure to lower the gain as to not pop the speakers or amp.
The BP300.1 is a mono (1 channel) amp. You cannot bridge a mono amp. Bridging is a method of combining the outputs of 2 or more channels of a multichannel amp into a single mono load. On your amp you would connect a single sub to one of the +'s and one of the -'s (either one is OK, they are connected internally). The other pair of terminals is just for convenience, making it easier to connect, if you want to power 2 subs.
If the amplifier supports an RMS power output close to the RMS input power of the subwoofers then run the amplifier in stereo mode. For example 150 watts RMS X 4 channels driven at 20-20khz. (If you can provide a model # for the subs and the amp your looking at I can help you further with this decision.
Wiring for this is easy and simply involves matching the connectors for 2 of the channels (Front or Rear) to each of the subwoofers.
#2 Mono Bridged mode.
If the amplifier is lower power but mono bridgable you can bridge two Pairs of channels and power each of the subwoofers this way.
Generally speaking a 2 channel bridgable amplifier will be able to at least combine the wattage of each channel into a single monural channel and in many cases its actually higher.
So you would bridge the front 2 channels into a single bridged mode for one subwoofer. and then you could bridge the read 2 channels into another bridged mono channel for your other sub woofer.
For example if you had bridgable amplifier thats 50 watts RMS X 4 you coudl very likely (Generalization based on quality of amplifier) send 150 watts RMS to each subwoofer.
Again I would need to know what amp you're refering to to provide specific wiring instructions. Many Bridging amplifiers either have a single switch that will send them to bridged mode or you would use the positive + terminal from one channel and the negative - terminal from the other channel or a combination of both.
It's not really made to run a dual 2ohm sub. What you can do though is wire the sub like this:
we'll call you subs voice coil A and B. Wire it like this A's(+) to (+) on amp; then A's (-) to B's (+), then B's (-) to (-) on the amp. This is known as series / parallel wiring it will effectively make your amp see a 4ohm mono load.
You can download the installation manual from the link below:
It has the following diagram plus other hookup info...
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