Enabling 70V Output on CSMA Amplifier
Frequently Asked Questions
Written by Ernesto Hernandez
Updated at September 10th, 2026
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Brand:
- JBL
Models:
- CSMA
Why don't I get any output on my new CSMA amplifier? My speakers are connected to 70v and common
Most likely the HI-Z switch isn't enabled. On the single channel models it is located immediately to the right of the output block:
For 2 channel models it is on the red dip switches under INPUT ROUTING. Switch 5 needs to be in the up position for channel 1, and switch 11 needs to be up for channel 2 to output to 70v.
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