No, don't use the amp in bridged mode with the Vista. A bridged amp "sees" a load impedance equal to the impedance of the speaker divided by 2. So it would see the Vista's nominal 4 ohm impedance as 2 ohms, and its 1.2 ohm impedance at 20 kHz as 0.6 ohms. The amp undoubtedly would not do well into that heavy a load. Note that the C272 literature only provides a bridged mode power rating for 8 ohm speakers.
In non-bridged mode the C272 appears to be able to provide large amounts of dynamic (short term) power into low impedances, which increases the likelihood that you'll have sufficient power with just the one amp.
Regards,
-- Al
In non-bridged mode the C272 appears to be able to provide large amounts of dynamic (short term) power into low impedances, which increases the likelihood that you'll have sufficient power with just the one amp.
Regards,
-- Al