i've also talked extensively with errin, and yes, the amps will put out a significant ammount of power.
I also have had a look inside of the amps, and while they're built to sustain alot more than 600w, I simply dont see the components to sustain 1800w.
what you're essentially doing is taking an amp that was overbuilt for stability and headroom, and turning it into a sony xplod, that's pressing to pull every watt from every component.
i'm going to quote another, former, pg employee here.. 'there is no free lunch'
if you're using the amps for burps, its absolutely a good plan - who cares how saturated the signal is, when all its doing is burping a tone for 30 seconds.. but if you expect these amps to sustain 1800w all day long, you need to take a look at the internals.
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but the good I see out of this trick is..... it gets rid of xe.load, and actually allows YOU to choose how much power the amp is putting out, which is excellent! I simply wouldnt advise trying to squeeze every last drop out of the amp..
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proskier - the dei module costs around $10. Any class-d amp producing roughly 1800w is going to have high current demands, and will all require large guage wire and likely an upgraded alternator.
if the amp can produce +1800w for $200, its still cheaper watt for watt than one that costs around $300 (i.e. the 9.1)
also, with this trick, its producing 1800w at 2 ohms, rather than 1ohm on a 9.1, current draw is going to be less. a 9.1 is also rated at 1200w, even being slightly underrated, theres no way in hell its putting out 1800.
on another note, if you have seen an amp that has cooked because of this mod, its very clear how it happened. this does void your warranty, plain and simple