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Even with that knowledge of the RZ4 I would still lean towards the pn4.1000D. I have the 4.520 which is the same amp as the RZ4 and I know what the Kappas sound like on that amp. I also know what they sound like when you have more power to throw at them too. I think the 4.1000D would be a better amp for the BT's and Kappas as well to see their full potential.
Soooo. Decided to go with the advice given and picked up a SS PN4.1000D to go with my 7.1's/fairing and kappas/lowers. Plan on installing them this week. Going to set gains with 1khz test tone and DMM. What do I set crossover to and at what Hz.
Do I set the gains at that crossover setting or set gains and then set crossover?
With the 1000D set the gains at 12:00 o'clock straight up. Then set the crossover on HP. At that point you can set the dial to the range HAZE explained in his post. With the Gain setting at 12 you won't get any distortion with the 7.1's.