Most amps are MOSFET circuits now. the dif between the amp in the pio and a seperate amp is that the pio does not and can not have the capacity of a sep amp. An amp needs capacitors to handle loud demands placed on it. Like when those bass notes hit. thats why you see the lights dim on a deck trying to push too hard

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97 F-150XL 4.2V6, 5 spd, 2wdlb, Kenwood cd, MTX 4ch amp, MTX 12"sub, MTX components in doors

Future 16x8 Daytona wheels, 265/75 tires, rhinoliner, perf stuff

MOSFET Vs. Separate Amp
 

Well my friends, I'm really liking my sounds system right now, but I know I'm still missing two parts. Speakers, and and amp?

The question is the amp, I just had my Pioneer DEH-P6300 HU installed which has in integated 50-x4way MOSFET amp. first of all, what is MOSFET?
Secondly, would I notice a difference in sound quality if I added another, say 125x4-way amp?
Thanks

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2000 4.2 Supercab XLT
What I've done: K&N filter, Magna flow custom exaust (From where cat's join, 3"in, two 2.5" out the rear), Michelin LTX M/S 265/75/16's, MTX Thunderform custom box with two 6000 series 8" subwoofers and Mtx 120 amp.
Plans: Lund hood deflector, superchip, Poweraid, Xenon sport Flares, (custom ram-air idea?)
New: Pioneer DEH-P6300 Head unit (I definately reccomend it!)

Well, I That's not really a problem for me, I don't blare it that loud. I have an amp for the sub and that's all it powers so I'm pretty well taken care of. If that was a prob with the sub, I'd prob just look at buying a capicitor, as it is rare I have it THAT loud. Thanks though