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I can't think of an amp that isn't stoopid expensive that would overpower a 4 ohm PRX418S ? Surely the 840W from an IPR3000 isn't too crazy for the 800w rated PRX418S ?
Without proper processing, I would hesitate to recommend 800+ watts into that driver.
In fact, IIRC that driver's rating changed from 600 to 800 watts without any other changes. I reconed plenty when they were rated at 600 watts (from folks educated beyond their own intelligence), why would I expect any different with the new rating?
Even with the proper processing, you are well into the power compression curve at 800 watts. That's the point of diminishing returns.
^ I was wondering where they got that 800w driver from without it being one of the differential drive ones. Kinda sad that more and more manufacturers are just making up their specs .
Worse than that...
The sample I saw had a 2242HPL, but it looks like they are now using a Selenium 18SWS1000W (varient) which is rated in Brazilian watts at 1000, but 800AES. IMO, the AES number is a new rating scale that only requires survival for 2 hours. Frankly, I would find a 2 hour lifespan to be impractical in the real world. With the Xmax that's specified, without the proper HPF you will exceed LF-Xmax well before 800 watts. With the proper HPF and limiting, I would recommend around 800-900 watts. Without, stick closer to 500 watts.