Zapco only make 2 proper monoblocks but they also make some very powerful customiseable 2 channel and 4 channel amps which is called the C2K series.
The main 3 are the following:
C2K-3.0X - 75x2 @ 4ohm stereo,150x2 @ 2ohm stereo, 300x2 @ 1ohm stereo, 600x1 @ 2ohm mono - £565
C2K-6.0x - 150x2 @ 4ohm stereo, 300x2 @ 2ohm stereo, 600x2 @ 1ohm stereo, 1200x2 @ 2ohm mono - £850
C2K-9.0XD - Class D - 300x2 @ 4ohm stereo, 2000x1 @ 4 ohm bridged - £1350
4KW - 1000x4 @ 2 or 1 ohm, 5000 RMS when used in Dual mono mode - £5000
The 9.0XD can also be bought in a 1ohm stereo/2ohm mono version to match it up to whichever sub/s you are running......which is handy!!!
You can also get EQs, 3 and 4 way Crossovers, D/A Converters and loads of products with something called Symbilink which is basically Firewire technology from years before PCs used it.
Symbilink gives you extra voltage to your amps and also removes almost all noise and distortion from the RCA signal giving better SQ.
We have a few brochures which we could send out if anyone is interested.
Russ