The Quad Digital Equaliser shall provide four audio channels (analogue and digital, in and out) grouped as two linkable pairs in a standard 1U 19” rack mount chassis.

Each audio channel shall include: Source select (analogue or digital), input gain, delay up to one second, up to four filters, two dynamic EQ bands, up to 12 parametric EQ bands and a 31 band graphic EQ.

Digital inputs shall run at any sample rate up to 96kHz with internal sample rate conversion. The sample rate converter can be bypassed when the incoming digital signal has a sample rate of 44.1kHz or 48kHz.

A word clock input shall be provided to allow the system to lock to an external clock source. In addition, the word clock input can be used to only clock the digital outputs allowing digital audio to come into the unit at one sample rate and go out at another.

Digital outputs shall also run at any sample rate up to 96kHz. In standard operation, they shall run at the system sample rate (48kHz or 44.1kHz). Using the internal SRC, the digital outputs can also run at the same sample rate as the digital inputs or the word clock input.

All delay times shall be set in milliseconds and microseconds, or in distance units (metric and imperial) with a temperature compensation facility.

The high and low pass filters shall be selectable from notch, high pass, low pass, high shelf and low shelf types. The Low pass and high pass filters shall have selectable slopes of 6, 12, 18, 24, 36 and 48 dB per octave and the high and low shelf filters shall have selectable slopes of 6 and 12 dB per octave and ±12 dB of gain.

The dynamic EQ sections shall have independent high and low level thresholds and gain and be selectable from parametric EQ, or high shelf or low shelf filter types. The parametric EQ shall provide proportional-Q, constant-Q and symmetrical-Q responses. The dynamic EQ sections shall also have independent attack and release times.

The parametric EQ sections shall have up to 12 dB of cut or boost and a Q value variable from 0.4 to 20. The parametric EQ shall provide proportional-Q, constant-Q and symmetrical-Q responses.

The graphic EQ section shall provide 31 bands on standard frequencies defined in BS EN ISO 266 : 1997. Proportional-Q, constant-Q and symmetrical-Q responses shall be provided as well as emulations of Klark Teknik DN27 and DN360 Graphic Equalisers.

Each Quad Digital Equaliser shall meet or exceed the following performance specifications:

Frequency response: ±0.3 dB (20 Hz to 20 kHz)
Distortion @ +4 dBu: <0.01% (20 Hz to 20 kHz)
Dynamic Range: 115 dB (20 Hz to 20 kHz unweighted)

All analogue audio inputs and outputs shall be electronically balanced and use XLR connectors. All digital audio inputs and outputs shall be 110Ω AES/EBU and use XLR connectors. There shall be two three-character starburst LED displays per pair of audio channels for displaying recalled memory, communications channel setting and remotely-set user information. There shall also be physical write-on strips for each pair of audio channels plus an additional one for the unit as a whole.

There shall be provision for 32 system memories and 32 factory presets.

The Quad Digital Equaliser shall be provided with an RS-232 port on the front panel and two Ethernet ports on the rear panel. The Ethernet ports and RS-232 port shall be provided for remote control from a master Digital Equaliser or a PC and additionally the front panel RS-232 port shall also provide the facility to download software updates and preset memories into the Quad Digital Equaliser. There shall also be a rear panel relay contact closure port to allow the recall of specific preset memories. The Quad Digital Equaliser shall be controllable from the ELGAR remote control PC software. and have utility software to allow the editing of factory presets using an industry standard PC spreadsheet application.

The unit shall be capable of operating from a 100 to 240V, ±10%.

The Quad Digital Equaliser shall be the Klark Teknik model DN9344E and no alternative option is available.

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