CT Sounds CT-700.1D Monoblock Amp vs CT Sounds CT-150.4D

These are different tools, not rivals. The CT-700.1D is a mono subwoofer amp: 700 watts RMS at 1 ohm, 380 at 2 ohm, 200 at 4 ohm, with subsonic filter, bass boost and a remote bass knob. The CT-150.4D is a four-channel full-range amp: 150 watts RMS per channel at 4 ohm, 250 at 2 ohm, or 475 bridged into two channels, for door speakers or a small sub stage. Owners of both praise the compact Class D chassis, cool running and protection circuitry; the mono amp's one recurring complaint is a unit that failed after about 2.5 years.

• Choose the CT-700.1D if you are powering one or more subwoofers and want a dedicated 1-ohm-stable mono block with a remote bass knob.
• Choose the CT-150.4D if you need to drive front and rear speakers, or bridge two channels for a sub while keeping two for the doors.