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What load is the amplifier designed to drive? It will only deliver maximum power into the optimum load. The loudspeakers are probably 4 Ohms, but the amplifier may well be able to drive 2 Ohms per channel. This means that you need to fit two more loudspeakers This is probably not possible. Alternatively, if the amplifier can be bridged AND can safely drive 2 Ohms bridged or 1 Ohm per channel, you should connect the two loudspeakers together (+ to + and - to -) and connect them to the amplifier output terminals indicated for bridge (often Left + and Right + but sometimes Left + and Right -). If the amplifier can't drive 2 Ohms bridged, do not connect the loudspeakers together, buy another amplifier and connect one loudspeaker to each, with both amps in bridge mode.
Remember that loudspeaker and amplifier power ratings are always massively inflated in the manufacturers' data, often by a factor of 4 and sometimes by 10 or more. You speakers may not be able to cope with a whole amplifier each, so proceed with caution.
if you are trying to use it with the stock headunit you would need to buy a line output converter to use your amp and sub.
after you buy the converter you will then need to splice into one of your rear speaker wires so you can run the rca's to the amp and continue with normal install
No, thats what you don't what to do. Even if you have 2 matching amps you don't do that. Every amp puts out different, and for 2 subs, you want to play at the the same time. If your only running 2 10's, I personal would just run the alpine (it's a mono amp made especially for subs) thats plenty for what you have. make sure you bridge them to get the full response. And your other amp i would use for your highs or mids, but run it @ stereo , which is 300 w @ 4 ohms. (Note: 600w @ 2ohms would be bridged and would play in Mono)
Building Competition stereo's is a big hobby of mine.
400 watts delivered to 300 watt speakers the only way to do this would be to wire two subwoofers in series so that the power needed to drive them will be 600 watts to max, however this will increase your impedance on the speaker (8 ohms) load so what you can do to compensate is get an 8 ohm 600 watt resistor and put it in parallel with the speakers you will then have 4 ohms of impedance at a total capacity of 600 watts of power
In other words the amplifier won't blow these out now.
I do not reccommend that you push the Pioneer speakers over 100 watts. The jenson will already drown the car with bass through your pioneers so much you will want to turn off the bass boost when playing some low bass hip hop songs. It changes from one venue of song to another, so I just keep the jenson bass boost off and use my head unit to adjsut the sound to fit my listening prefences. I am telling you man, you will be blown away . Hook up the pioneers straight to the Channels,. do not bridge. I put Subs in my truck though. I used the Pass output to send the audio to me Jenson 2 Channel 600W amp. I drive one 10 inch enclosed JBL Class A/B Sub. I bridged the output of the 600 W amp to the 10 inch sub in my Z28. The pioneers never get drowned out. I did smoke my 2 channel Amp one time. and also took out a MTD 10inch sub. I am talk shooting flames and smoked the whole car up. I think if you bride the XA4150 to the pioneers, you will have the flaming smoke problem in no time.