Your deck doesn't put out 22w. I don't think I'm understanding right...you have the old RF amp for subs or for mids/highs?
Sorry, I was just parroting the specs from them, "built-in amplifier (22 watts RMS/50 peak x 4 channels)". If you're saying they hyped up those ratings, I won't argue with you, but it seems about right, listening to it.
My RF PUNCH goes both ways. It's rated at 100W x 2, but sounds WAY louder. It's intense. It's got switches to HPF or LPF, so I've hooked it up both ways. It PUSHES my dual 10's that're rated at 300W RMS. It's probably just a "real" RMS rating, instead of the hype that so many other companies say. Maybe it's 100W, 20Hz - 20KHz, instead of just at 1kHz or whatever, you know what I'm saying. It's a good amp.
I've had the PUNCH on mids/highs and it can make my ears bleed (figuratively) if I wanted it too. On the subs (2 x JL Audio CP110-W0v3's), it makes them thump WAY harder than my powered RF R300-12 "PRIME" that says it's 300W RMS. I just think PUNCH puts PRIME to shame, for some reason - not sure why since they're from the same company, why they'd rate differently for each respective series. I just know that PUNCH amp is no joke (for my modest budget).
So, yeah, the old RF PUNCH can be used for either mids/highs, or subs, and I've had it both ways (not at the same time), so it's versatile like that. I'd rather use it for my subs, because it's a bit overkill for mids/highs (for me anyway), a bit too much power for what I'd need in that regard. Regards.