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Most all component speakers have a gain cut for the tweeter on the crossover. Most are pre-set to -6 or -3 db from the factory. My guess would be yours are as well. Try setting them to reference (0db) and give it a listen.
 

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Right, it was at 0 db from the factory and I left it as such. I tried it with it at -3 db, -6 db, and -9 db but obviously it didn't make it any louder.
Odd. Could be a placement issue, or perhaps they're just wanting more power. The speakers are rated for 60 watts RMS, and if you're driving them in a normal 4-ohm stereo setup from the amp, you're only sending 40 watts to them.

I'd recommend swapping the amp for a PDX-5, turn the gains down a good bit so you don't overdrive the speakers, and you'll probably get the output you're after.
 
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