DPR-901ii Dynamic Equalizer

The DPR-901ii is a 4-band parametric equalizer which varies the degree of equalization dynamically, as the program level changes. The process can be thought of as frequency selective compression and/or expansion, but it is fundamentally different to simple 'frequency-conscious' dynamics processing as used for noise gating, de-essing and the like. It is also very different to the growing family of 'sliding filter' techniques used in single-ended noise reduction processors. A split facility allows the unit to be used as 2 separate 2-band units, and a side chain listen button allows monitoring of the filter setup.

Frequency selective compression is equivalent to applying CUT on a normal equalizer while frequency selective expansion is like applying
BOOST. However, the DPR-901ii can be more subtle as the process is dynamic: it will only occur above (or below) the threshold you have set.

Some possible uses for the DPR-901ii technology can be:
¢To selectively compress and/or expand, broad or narrow-band segments of program.

¢To de-ess and de-pop.
¢To add dynamic loudness control (eg. bass boost at low SPLs).
¢To control SPL in a dynamic and frequency conscious manner.
¢To enhance or 'sweeten' mixed programme.
¢To improve voice intelligibility (without risking howlround or feed-back).
¢To enhance low level vocals.
¢To correct for and/or guard against, bad microphone technique (by unskilled performers).

And in common with other units in BSS Audio's processor range, the DPR-901ii features:
¢Friendly rotary control knobs for all parameter adjustments.
¢Excellent low level resolution to maintain subtle musical detail.

¢Minimum phase and low group delay for any EQ setting.

¢High headroom >+ 20dBu.

¢Conservative drive capability into low impedances (down to 600 ohms) and long, highly capacitive cables.

¢Automatic relay controlled signal bypass if mains power is disconnected or fails.


Altogether, the DPR-901ii will not degrade a conventional high quality analogue signal processing chain, even when two units are inserted in
line with the composite stereo mix.