I have a Rockford Fosgate R2D4-10 subwoofer http://www.crutchfield.com/p_575R2SD...10.html?tp=111 My friend said he would give me his Dual XPA4640 4 channel amp http://www.crutchfield.com/p_070XPA4...cs#details-tab The sub is rated up to 200 watts rms and the amp can be 75 Watts RMS x 4 channels at 2 ohms and
150 Watts RMS x 2 channels at 4 ohms (bridged). Minimum of 4 ohm when bridged. Is this amp big enough for the sub to supply it sufficiently and avoid clipping? If so what is the best way to wire it? thanks for lookin

 

Not really. I mean yes, it will work.... but that amp is much more suited for mids/highs, than it a subwoofer. Also, that amps specs (like most cheaper amps) are WAY inflated. They are telling you the max power at 1% dis.

For $109, I might expect about 100 wts RMS at .05% (in other words, real power) and this would be barely enough to get that sub going.

If it were me, I'd look for a reasonable little class D mono subwoofer amp. And no matter what the brand, I wouldn't buy it unless I could find some independent testing on it, to tell the "actual" wattage.

Unless your buying something like a Rockford Fosgate, or a few others, which give a birth sheet, with the actual wattage output, I really would never go by what the manufacturer says about the amps output.

I just saw an independent test yesterday on Youtube, of an amp rated for 2000wts. In reality, it put out 313 wts ? And this is just SOOO common.
Their are just not any kinds of regulations for what an a company can tell you about the output of their amps.

Peace,
Fish

 

Well said! thanks for clarifying

 

Ik there is much controversy about hooking up dvc....but what if i would hook each voice coil up to a separate bridged channel? each coil would see 150watts rms at 4ohm giving the sub 300 watts total...i've heard you are not supposed to hook each coil up to a separate channel, but as long as they see the same polarity whats the hurt? Crutchfield says its a benefit of having 2 coils. http://www.crutchfield.com/learn/lea...R2SD410&tp=111

 

I talked to a guy at an audio store and he told me to use only one of the coils with one of the bridged 150w channel and do nothing with the other coil....need some opinions

 

Definitely don't hook each channel up to a separate coil, especially with that amp. You'll end up just destroying the sub because its not going to put out the same power on each channel. And I wouldn't do what the shop said either, your best bet is to get a good amp that can do 200-300rms at 2 ohms on a single channel like fish said.

 

Alrighty will do! thanks for the advice