Depends on whether you have the 2 or the 4 ohm version.
For a pair of the 2 ohm CVR's, a 2 ohm stable mono amp is the way to go, a fine example is the kicker zx750.1 (very popular for a pair of CVR's)
If you have a pair of the 4 ohms CVR's, either a 1 ohm stable mono amp will work, or a big 2...