Dual Mode Amplification for CM series 70 volt amplifiers
The article refers to the CM4-750, CM3-750, and CM2-750 70 volt amplifiers with Dual Mode Amplification.
Dual Mode Amplification – The unique CM series amplifiers are designed to play into either high impedance 70 volt loads (Hi Z) or into traditional 4 or 8 ohm loads (Lo Z). The CM amplifiers are stable to 2 ohms.
Power Output (70 V / 100 V): 750W per channel
Power Output (8Ω / 4Ω): 625W per channel
Simple Mode A/B dip switches allow the user to change the current limiting function of the amplifier's outputs, and must be adjusted depending on how they are used.. The CM amplifiers can run a 70V line or 8 ohm speaker in Mode A, or a bridged 100V line or 4 ohm speakers in Mode B, either in stereo or mono operation. The CM2-750 has 2 switches, the CM3-750 has 3 switches, and the CM4-750 has 4 switches. Switches UP for Mode A = 70V & 8 ohm, switches DOWN for Mode B = 4 ohm & 100V (bridged).
Example
If you have a line of 100V speakers, set the dip switches for the 100V outputs to Mode B. You must bridge 2 outputs together to provide enough power to the 100V speaker line. For information on Bridging, check the article here: https://support.audiocontrolpro.com/portal/en/kb/articles/how-to-bridge-amp-channels-on-the-cm-series-70-volt-amplifiers
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Firmware updates
If you need additional assistance, our Customer Service and Technical Support representatives are available Monday thru Friday 8am to 5pm PST. 425-775-8461.
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