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Unlike a passive speaker, the U15a’s amplifier includes potentiometers for HF trim and overall gain. The service manual provides the to set the correct bias current for the output transistors. Guessing these settings leads to thermal runaway or asymmetric clipping. Beta 3 U15a Service Manual
The U15a features a bi-amplified design, meaning separate power stages drive the woofer and the compression driver. Best for: Groups, forums, and visual feeds