Question:
I have an old 2-channel PPI A200.2 amp that delivers 200watts RMS @ 4-ohms bridged. I know I'm supposed to put 1 positive in a channel and 1 negative in the other channel. I have two 12" subs, but bc the amp isn't that powerful, can I get the same effect (power) using just one 12", or can u only bridge with 2 subs? Right now I have my first subs wires -/+ hooked to the 2 channels in the amp, and the other sub wires hooked to the first sub. Can I use just 1 sub and get the same power? thanks
Answers:
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It sounds like you're mixed up about what you're doing.If you bridge the amp and it's 200 watts RMS @ 4-ohms you probably do not want to connect to subs to it while bridged.
You will need to refer to the manual on how to wire the sub to the amp in bridged mode but it sounds like from what you describe above that you use the positive terminal from one channel and the negative of the other. Doing this you will get 200 watts to your one sub.
Should you connect the other sub you would have to connect the subs either in parallel which will run your amp @ 2 ohms assuming 4 ohm subs which is not a good idea when bridged OR wiring them in series will be an 8ohm load - probably not producing enough power to run 2 subs.
When buying and amp for your sub do you go for the RMS of the sub or MAX power?
It sounds like right now you have your amp bridged and your subs wired in series to the amp. If you are running 4 ohm subs you're only getting 100 watts @ 8 ohms to the subs or 50 watts each. Doubling the resistantce (ohms) halves the power (watts).
Not to mention you would likely get more power to each sub by simply connected each sub to one channel and both channels on the amp rather than briding it. It makes no sense to wire it the way you have it.
If you disconnect the second sub you will get 4 times as much power to a single sub - the full 200 watts @ 4 ohms bridged.
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Your best bet is probably to get a second identical amp and run one amp bridged for each sub or get a more powerful amplifier that can power both.
With the first sub bridged, the amp 'sees' a 4Ohm load. Hook both speakers to it and the amp is loaded @ 2Ohms, bridged (when the output signal from amp is split, the resistance is cut in half as it goes through 2 voice coils instead of 1). This is not safe. Your amp is rated for a minimum load of 4Ohms, bridged.
To get the most output from what you've got, and since one sub will handle the bridged power, only use one - bridged.
Also you could connect 1 sub to each channel. This will give you the same power, but split between the 2 subs.
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Good Luck!
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