Well I had the type R's in 1.75 sealed and they sounded good to me. I then went with the 1 single sub setups for awhile and now back to the 2 12's. Purchased some uber cheap Pioneer Premier championship series 400rms subs and they sound louder than my type R's and cleaner and have some surprising lows to boot. I paid 65 dollars for each 12.
I only recommed them because they call for anything from 1.0cft to 1.75. So might be something to consider.
Also this was off the same RMS, just different amps. R's were on old school Lanzar and now have Autotek 1000rms street machine.