Sorry about that, realized you added the year/model in your thread title.
The problem with Amplifiers without any external adjustments is the inability to match gain levels and adjust sound frequencies to best match the characteristics of the audio gear you're using and the type of music you listen to. So, for me one of the first steps of a decent audio upgrade is selecting an AMP with adequate power delivery specifications that has external adjustments for the gain and frequency settings.
Since you are going with two pairs of speakers (fairing + lowers) a four channel AMP makes the most sense using a standard wiring scheme. There are plenty of decent 4-channel AMPs that can be had for less than $200.
Cerwin Vega, Soundstream and NVX come to mind. I personally like the CV B54 for pushing 2 pairs of 2 ohm speakers. It has plenty of power for that, it is reasonable in size so easy to install, and it won't break the bank.
I think you said you already had 2 sets of the Kappas. That is a fine starting point. One set fit without any issue in the fairing (which they should have as I've installed several there). The other set won't fit in the lowers because of depth. First thing to do there is find out how much more clearance you need in the lowers. If it's 1/2" or less you can simply pick up a set of speaker ring spacers in the appropriate width. Whether you need 1/4", 1/2" etc.
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