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Buzz Audio REQ 2.2 ME

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Buzz Audio REQ-2.2 resonance mastering equalizer is a high-end stereo, four band inductor based, parametric mastering and recording equalizer, that operates and sounds like no other.

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€6,680.00 (VAT incl.)

€6,680.00 Excl. VAT
Availability : 3 months
Condition
New product
Reference:
REQ22ME
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Description

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 transistor 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 center 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 aluminum 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).

Options
The REQ is available with a silver-grey or black face plate.mastering equalizer Only the mastering version is manufactured with the recording version now discontinued. There is an option for the Low Band section of the REQ. This option replaces the Choke based eq filter with an Active filter which provides a "tighter" bass sound. This option (the ALB) has come about from requests from some users who work with modern music styles in mastering. The only operational difference between the Active and Choke filters is that in Shelf mode, the Bandwidth control does not work as a slope control and is disabled.

You can also order the REQ with Lundahl output transformers. When fitted, the direct balanced line out is available on the LINE OUT 1 XLR connectors and the transformer coupled output on the LINE OUT 2 XLR connectors. There are two Lundahl options, the LL1517 audio C-core or the LL1684 amorphous core (expensive!).

Ordering model numbers and indicative pricing
Mastering version with choke filter low band - REQ-2.2ME 6 360.00 Excl. VAT + shipping
Mastering version with active filter low band - REQ-2.2MEA 6360.00 Excl. VAT + shipping
Lundahl LL1517 transformer option (both channels) 190.00 € Excl. VAT
Lundahl LL1684 transformer option (both channels) 320.00 € Excl. VAT

The Active Low Band (ALB) cards can be easily fitted to existing units and you can purchase the kit online here.
Download the instructions to fit the ALB cards here.

We have in the past supplied custom front panel finishes, custom mastering boost/cut ranges, please feel free to contact us to discuss your desires! If you are looking for the REQ upgrade info it is here.

Frequency chart
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 transistor 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.

LOW FREQ LOW MID FREQ x1 LOW MID FREQ x2.5 HIGH MID FREQ x1

HIGH MID FREQ x2.5

HIGH FREQ   HPF  
30Hz 85Hz 215Hz 560Hz 1410Hz 1870Hz 20Hz
45Hz 110Hz 275Hz 710Hz 1780Hz 2360Hz 26Hz
60Hz 135Hz 340Hz 910Hz 2280Hz 3000Hz 46Hz
75Hz 170Hz 450Hz 1150Hz 2750Hz 3700Hz 58Hz
95Hz 210Hz 540Hz 1450Hz 3550Hz 4800Hz 70Hz
120Hz 260Hz 660Hz 1700Hz 4230Hz 5900Hz
150Hz 320Hz 820Hz 2100Hz 5200Hz 7250Hz
185Hz 400Hz 1000Hz 2650Hz 6500Hz 8800Hz
230Hz 500Hz 1300Hz 3450Hz 8100Hz 10.8kHz
290Hz 610Hz 1525Hz 4000Hz 10kHz 13.5kHz
350Hz 750Hz 1880Hz 4900Hz 12kHz 16.5kHz
440Hz 930Hz 2330Hz 6250Hz 15.5kHz 20.5kHz

Specifications
Frequency Response measured with all eq bands on and set flat, Saturation and HPF off = 5Hz to 125kHz +0.2/-3dB

  • Harmonic Distortion at +10dBu signal level;
  • Saturation OFF; 100Hz 0.007%...1kHz 0.004%...10kHz 0.007%...100kHz 0.013%
  • Saturation ON POS-1; 20Hz 1.5%...100Hz 0.07%...1kHz and up 0.01%
  • Saturation ON POS-2; 20Hz 1.5%...100Hz 0.14%...1kHz and up 0.01%
  • Saturation ON POS-3; 20Hz 1.5%...100Hz 0.16%...1kHz and up 0.01%
  • Saturation ON POS-4; 20Hz 1.6%...100Hz 0.17%...1kHz and up 0.01%
  • Saturation ON POS-5; 20Hz 1.7%...100Hz 0.18%...1kHz and up 0.01%
  • Saturation ON POS-6; 20Hz 2.0%...100Hz 0.22%...1kHz and up 0.01%
  • Maximum Input Level; +25dBu
  • Input Impedance; approx 20k ohms
  • Maximum Output Level; +32dBu balanced
  • Output Impedance; approx 70 ohms
  • Input Common Mode Rejection; (ref 0dBu) 100Hz -65dB…1kHz -65dB…10kHz -60dB
  • Noise all bands ON set flat; -110dB below max output level (A weighted)
  • Power requirements 115V/230V selectable on rear panel
  • Dimensions 4U rack mount, 300mm deep


Specifications are typical of a production unit and are subject to change without notice. 0dBu reference = 0.775 volts RMS.

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Product Details
REQ22ME

Data sheet

Condition
New
Type
4 bands Parametric EQ
Application
Mastering
Channels
Dual Mono
Circuit
Solid State
Inout transformer(s)
None
Output transformer(s)
Iron
Format
19"
Chassis
4 U
Quantity
1
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