Having Mosfets outputs does not mean a amp has PUNCH. Mosfets are a economical high current output device. they have always represented a high current alternative to Bi-polar transistors.
This along with the ongoing price reductions and output capacity gains in design, make the Mosfet the chief competitor against BJT's in a amp design. Mosfets were generally not used before the late 80's when they finally had viable power devices on the market (i.e. they were the last of the power devices to be manufactured and marketed for use in audio amps)
Neither format has a complete answer to all of the issues of a solid state amp. But I think Mosfet amps may be a more economical to produce. If you will look at PG's lower line products like the XS and Tantrum < all excellent products> but all considered to be lower line Ryval type competitor based products. PG offered a run for the money to Rf and others by marketing products that compared favorably both is price, power, and design.
Rockford Fosgate has always had market share of the car amp business from way back in the 80's on. They have always used Mosfets except in their very first amp they made long long ago. It was clearly a engineering decision to make and market their products this way, and from my understanding of the manufacturing side of the business its all about profitability and profit margin.
That and the much loved and adored Fosgate Bass boost of +18 DB's which has always been a real big winner for them over the years. IMO
I think the 18 DB's bass boost is where RF get their so called PUNCH from, and this can be duplicated by using a Zapco Keyboard type EQ < another much over priced and adored item from the past>
I'm bad mouthing RF products I have made enough money repairing them over the years to put a couple cars in my yard
Thanks mostly to their market share and the huge amount of abuse they get by their proud owners. Who seem to be able to blow them up as easily as any other amp made by anyone else...
On a technical side I would tend to think that any PUNCH difference in any amp would be based internally on its power supply energy storage and possibly its output impedance and damping factors. I say this because these things control the overall power side of this picture.
As I am opening myself up to be debated here I am closing my comments about this in the same post as I made them. I think with adequate web search most of what I have said can be verified rather that disputed by those that know it all. Have a great day
