DRAWMER DL251 COMPRESSORE Spectral Compressor Compressor. The compressor section can be switched to provide either HARD or SOFT knee compression Enhance Level Metering Bypass Stereo Link Peak Level. 'Zero Response Time', 'Zero Overshoot' circuitry provides an absolute limit to the peak level of the output signal Operating Level. The operating level of the DL251 can be instantly switched, independently on each channel The DL251 is provided with balanced inputs and outputs on XLR connections.