The DPR-901 II is a four-band parametric Dynamic Equaliser which allows frequency-selective compression (-3OdB) and expansion (+16dB).

Each band has:

• A frequency sweep.
• A bell width.
• An IN/OUT switch.
• Compress/expand control.
• Compress/expand metering.
• Threshold metering.
• Time constants which are automatically controlled by dynamic and harmonic content of signal with selectable FAST RELEASE.

It has a filter switch on bands 1&4 which changes bell filter response to a shelving response and on bands 2 & 3 cancels the filter for wide band operation.

Electronically balanced input and output.

The unit may be set up as a 1 input/4band or 2 input / 2 bands per channel device, and the filter side chain may be monitored to allow precise tuning of the audio spectrum to be effected.