REQ-2.2 Resonance Equalizer Users Manual REQ-2.2 USERS MANUAL VERSION-2, MAY 2009. CONTENTS COPYRIGHT BUZZ AUDIO LTD 2008. PO BOX 6677, TE ARO. WELLINGTON, NEW ZEALAND. PH. +64-4-472-3084 www.buzzaudio.com email management@buzzaudio.co.
Welcome… Thank you for choosing the Buzz Audio REQ-2.2 Resonance Equalizer. In this manual you will find important information regarding the use of the REQ and we suggest you do read it before using the unit to become familiar with all the controls and their function. If after unpacking the REQ you find any damage to the unit you should contact your dealer or supplier immediately for advice on what to do.
1] Installation Precautions The REQ-2.2 uses discrete Class A audio amplifiers and these along with the power supply generate a fair amount of heat. Whilst the casing has many ventilation holes, care should be taken to avoid racking the REQ along side other units that run hot. If possible, allow ventilation space between the REQ and other hot running boxes. If the REQ becomes too hot, internal parameters may change and this may show up as clicks when switching the EQ bands in and out.
Slide out the fuse draw below the IEC power inlet using a small flat blade screwdriver and insert the appropriate fuse into the carrier clip. Note there is also a position in the carrier for a spare fuse (the square tube bit) and we suggest you store the second supplied appropriate fuse here. Fitting the wrong fuse may result in the fuse blowing on power up or inadequate protection. Fitting a fast blow type fuse may also result in the fuse blowing on power up.
4] Overview The REQ-2.2 is a stereo audio equalizer with four “eq” bands per channel plus a high pass filter and unique “saturation” module. Front panel controls allow you to adjust each eq band centre frequency, filter bandwidth (or Q) and the amount of cut/boost. Each element has it’s own on/off switch which removes it from the signal path when off. The high and low bands can be switched from a bell filter to a shelving filter, and the bandwidth control reverts to a shelf slope control when in shelf mode.
5] Controls EQ Band Controls FREQUENCY – each band has a 12 position frequency control which sets the centre frequency of the filter. The two mid bands have two ranges of frequency, and the blue lettering applies when the FREQ x2.5 switch is illuminated. BANDWIDTH (low mid and high mid) – a 12 position switch to set the width of the bell filters ranging from 2 octaves to 0.25 octaves wide. See the graphs at the end of this manual for more detail.
CUT/BOOST – adjusts the amount of eq applied to the signal. The above drawing shows the standard version with +/-16dB range. The mastering version of the REQ has a stepped +/-8dB range. ON – when this switch is illuminated, the associated eq band is engaged into the signal path. When switched off, the eq band is completely removed from the signal path. PEAK – this red LED will illuminate when levels within the REQ circuitry approach +22dBu warning of possible internal overload.
standard version. The mastering version has a different set of frequencies optimized for stereo program equalisation. See the graphs at the end of this manual for more detail. SYSTEM – these switches are used to completely bypass the REQ. When not illuminated, the REQ input XLR connectors are directly connected to the output XLR connectors providing a hard wire bypass. Note that the REQ still does receive signal at it’s input when bypassed.
7] Service Information We are confident that you will receive many years of trouble free operation from your unit. If however you experience any technical problem with your REQ, contact your dealer or Buzz Audio for recommendations on what to do. The modular nature of the REQ construction means most electronic faults can be easily repaired by swapping out the circuit boards. For on line support visit our web site; www.buzzaudio.com Buzz Audio, PO Box 6677, Wellington 6141, New Zealand. Phone +64+4+472-3084.
9] Graphs 12 12
