I have an amp product number ICBM-6681 byPerformance Teknique.
I cant find an exact RMS rating. If anyone can ID appreciate it. Now I have it hooked up to one of the old grey and red Alpine Type-R 12. I'm thinking IT will be pushing around 500RMS at least. Since it takes 4, 25 AMP fuses (I was told higher amp fuses an amplifier takes the higher RMS)

My question is.
Stick with the type R and run a single 12' sub

Get 2 12s with a lower RMS rating
(Like 2 of the cvr kickers that are 300 RMS each)

Go and run a single 15.

Already have highs cover with alpine 6x9s
Any advice, or info on my amplifier would be great thank you!