Buzz Audio REQ-2.2 ME
True Class A Resonance 2 Channel Mastering Equalizer with 72 different frequencies split over four bands per channel; with +/- 8dB boost/cut via 23 position ELMA brand switches
The REQ is a combination of passive filter circuits and active amplifier stages. Parallel resonant chokes and capacitors form the frequency selective part of each band and these are coupled into the amplifier stage via the boost/cut control. The resulting equalisation is best described as "surreal" and it never sounds hard or harsh. The low frequencies remain tight and powerful with the high frequencies clear and well defined.
A high end stereo four band inductor based parametric mastering and recording equalizer, that operates and sounds like no other.
the resonance factor
The REQ-2.2 equalizer utilises parallel resonant circuits in a clever configuration whereby the bandwidth (Q) of the circuit can be adjusted like an active filter, but without any complex relay switching. The inductor/capacitor resonant "tank" eq circuit runs at a low internal signal level which avoids any inductor saturation effects. The overall result is the sound of real choke based filters with a big open sound, but without the limitation of only a few - or no bandwidth selections as found on traditional choke eq's.
audio path quality
As you would expect, the REQ uses our BE40 True Class A circuits developed for the MA-2.2 microphone amplifier for the best possible audio performance that mastering engineers desire. But sometimes you might need a bit more color, so we have included a saturation section that introduces measured amounts of low frequency harmonic distortion via a steel audio transformer driven by a single ended tansistor amplifier. The High Pass Filter is placed in the beginning of the eq chain and the Low Band eq section is placed last in the chain. This layout produces the best overall equalizer coherency.
operational beauty
The large knobs and positive feel of the switching make the REQ a pleasure to operate and everything is visually clear when mounted into a console. In total there are 72 frequency choices per channel with overlapping selections across the four bands so you can always find the centre frequency you are looking for. A looping line XLR input and two parallel XLR outputs provide flexible connection options in the mastering control room. Finally, the brushed aluminium low glare rustic silver finish and retro Elma knobs give the REQ an impressive look in your rack!
controls and functions
Each eq band has a 12 position switch to select the Frequency and another that selects the Bandwidth of the bell shape curve (Q) which is adjustable from 1/3 octave to 2 octaves wide. On the High and Low bands, the Bandwidth control reverts to shelf Slope control when Shelf mode is selected via the push button switch (not with the Active Low Band option). The Low and High Mid bands frequency range is changed to alternative selections when the Freq x2.5 mode is selected. Each band also has an in/out switch. The mastering version Boost/Cut control is a 23 postion Elma switch with a range of +/-8dB. The recording version is fitted with a Alps center detent pot with a range of +/- 15dB.
On the right side of the front panel are the High Pass Filter and Saturation controls with their own in/out switches. The overall System in/out controls and the power switch complete the picture. The channel A and channel B push button switches in this section can be grouped by holding down any switch for 5 seconds. This means for stereo work you only need to push either the channel A or B switch to change both channels simultaneously. (This feature only applies to units with serial number Q1110 and up).
Ordering model numbers
- Mastering EQ with choke filter low band - REQ-2.2 ME
- Mastering EQ with active filter low band - REQ-2.2 MEA
