What Steve saids..
Yes, what you want to look for is the impedance of the woofer. Its rated in ohms. Typically 4 or 8 ohms. For example if the amp says its 2 ohm stable dont go below that. So one 4 ohm speaker is ok, two 4 ohm speakers parallel wired together makes 2 ohms that is best, 3 will have the impedance too low 1.3 ohms and will damage the amp.
Yes, speakers are rated by power handling capacity, Having an amp with less than the power handling o speaker will not hurt anything.
SOURCE: 1000 watt amp sony xplod
how do you have your system hooked? What speakers do you have? There is a lot more too it then just wattage.
SOURCE: bridge subwoofers
Without looking up the individual specs of your speaker and amp, I'll offer a few basics when it comes to bridging an amp.
Most important...find out what impedance (ohm) that your amp can handle bridged!! If you go below this rating, you will run the risk and most likely eventually overheat and short circuit the amp. You must also know the impedance of your sub (which can come in a variety) to be able to match them. Depending on this impedance match-up, it may be less beneficial to bridge the speaker to this amp. For example if there is an impedance mismatch you'll either get less power from the amp or short circuit the amp. If you know these I can help you come up with the best solution.
If you know bridging is the best option, then you'll have to know which terminals on the amp to use in order to bridge. This is how it normally works. On a 2 channel amp...you would normally take the positive from one channel to the positive on the speaker, and the negative from the OTHER channel to the negative on the speaker...and this is how you bridge the amp. The other two channels would remain UNCONNECTED. BUT!!! you have to make sure you use the correct 2 channels...it varies from manufacturer. But take heed not overload the amp...and not to overpower the sub. There are a few different ways that you can configure the subs if you find it beneficial to bridge your amp, these would take long to explain and would depend on the impedance of your subs and specs of your amp...these wiring configurations is how you match the impedance of the speakers input to the amps output (and is very important to do correctly) Look up "parallel and series" wiring configurations. Let me know if this helps, or if you need further help. Find out the impedance of your subs and the specs of your amp and i'll be able to assist you more. Hope this helps.
SOURCE: need wireing diagram
Click Sony Support to download wiring instructions of XM-502Z amplifier.
SOURCE: 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!
SOURCE: how do you bridge a amp to one subwoofer the amp
http://www.docs.sony.com/release/XM1502SX.PDF
THE ABOVE LINK WILL TAKE YOU TO THE SONYSTYLE WEBSITES COPY OF YOUR AMPLIFIER'S USER MANUAL WHICH INCLUDES PRODUCT HOOK-UP AND DIAGRAMS. YOU WILL BE USING THE LEFT CHANNELS POSITIVE AND THE RIGHT CHANNELS NEGATIVE FOR A BRIDGED CONNECTION. THE CORRECT SPEAKER LOAD IS 4 OHMS MINIMUM. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE....V
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