While the PB13U and the PC13U utilize the same Sledge STA-1000D amplifier, the microprocessor flash file for the PC13U is different than for the PB13U. Namely the internal EQ curve and the limiter/compressor settings. So the correct flash file should be installed on the amp before it is sold, or a spare amp which is already flashed with the PC13U file should be installed. If your dealer needs assistance with that, please have them contact SVS-USA tech support for guidance.
Director - Technology and Customer Service
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