XTA GQ-600 2 x 31-band graphic equaliser

The XTA GQ600 combines innovative features with impressive specification, to produce a new level of performance in professional equalisation.

The XTA GQ600 is a precision dual channel 1/3 octave graphic equaliser which provides up to 10dB of boost or cut at 30 centre frequencies between 25Hz and 20kHz. Filter design has been carefully optimised for good interpolation and improved narrow band performance, whilst high quality long-throw 45mm sliders are used for better resolution.

The GQ600 also provides excellent noise and distortion performance, with a flat noise figure of better than-98dBm.

A shelving H.F. Trim section is provided, with adjustable gain and frequency allowing fast adjustments to be made to overall high frequency response. This obviates the need for system re-voicing when, for example, changes in humidity or audience size occur.

A sweepable high-pass filter offers turnover frequencies of 10Hz to 150Hz and a fixed frequency low-pass filter is also provided for increased H.F. driver protection. This filter is selectable in or out of circuit via jumper links on the main circuit board.

Audio inputs and outputs are provided on lockable LXR’s and ‘quick-wire’ Klippon connectors and are fully electronically balanced as standard. Optional transformer balancing is also available for both inputs and outputs.

Additional features include; relay fail-safe bypass, peak level indicators and optional perspex security cover.

The XTA GQ600 is sturdily constructed from high quality components and undergoes extensive testing and quality control procedures including a minimum 48 hours burn-in period prior to despatch.

Filter design is carefully optimised for good interpolation and improved narrow band performance.

Excellent noise and distortion performance.

High quality long throw 45mm sliders are used, improving resolution whilst eliminating the need for range switching.

Sweepable high-pass filter is provided.

Inputs and outputs are fully electronically balanced as standard.

A fixed frequency 18 dB/octave low-pass filter is provided for increasedH.F driver protection.

Both XLR and Klippon “quick-wire” connectors are provided.

Peak level indicators give prior warning of onset of clipping anywhere inthe equaliser.

Relay fail-safe bypass is provided, with turn-on delay.

Gain control and EQ in/out switch for each channel.

Inputs: Two, electronically balanced [++]
Impedance: > 10k ohms
CMRR: > 65dB 50Hz – 10kHz
Outputs: Two, electronically balanced [++]
Source Impedance: < 60 ohms
Min. Load: 600 ohms
Max. Level: ± 23dBm into 600 ohm load
Gain: ± 10dB via rotary control
Frequency Response: ± 0.5dB 20Hz to 20kHz with controls “flat”
Eq’v. Input Noise: <- 100dBm (20Hz – 20kHz un-weighted) with controls “flat”
Distortion @ +18dBm: < 0.01% @ 1kHz
Channel Separation: > 80dB @ 1kHz
Peak Indicator Threshold: + 20dBu
H.F Trim: Filter Type 2nd order, optimum phase, shelving
Frequency: 2K – 20kHz
Gain: ± 8dB
H.F Trim In/Out Front panel switch with LED

High-pass Filter
Filter Type: 12dB/octave H.P
Frequency (-3dB): 10Hz – 150Hz

Low-pass Filter
Filter Type: 18dB/octave 3dB @ 27kHz
LPF In/Out Link selectable on PCB

Equaliser Section
Filters: 2 x 301/3 octave, 25Hz-20kHz
Filter Type: High performance simulated LCR network
Freq. Tolerance: ± 3%
Range: ± 10dB

Power: 110/120 ± 15% @ 50/60Hz
Consumption: < 20W

Weight: 5.0 kG Net (6.7 kG Shipping)
Size: 5.25″ (3U) x 19″ x 9.3″ (133 x 482 x 237mm) excluding connectors.

GQ 600 Architects’ Specifications

The dual channel equaliser shall contain 2 x 30 filters centred on 1/3 octave ISO centre frequencies from 25Hz to 20kHz. 10dB of boost and cut shall be provided for each filter via 45mm slide controls. The slide controls shall incorporate centre detent. A high frequency “Trim” section with shelving response shall be provided, allowing up to 8dB of boost or cut to be applied at any frequency 2kHz to 20kHz via rotary frequency and gain controls. The gain control shall incorporate centre detent.

The equaliser shall contain 12dB/octave high-pass filters for each channel with turnover frequencies variable between 10Hz and 150Hz. A fixed frequency 19dB/octave low-pass filter shall be provided to aid H.F driver protection. The unit shall provide a rotary gain control for each channel allowing ±10dB of gain to be applied. This control shall incorporate centre detent.

An EQ in/out switch shall be provided for each channel, allowing the 1/3 octave equaliser section to be selected in or out of circuit. A peak level indicator shall provide warning when signals above 20dB are detected.

Audio connections shall be provided via XLR and Klippon “quick wire” connectors. Inputs and outputs shall be electronically balanced with transformer balancing available to order. A security cover shall be available to cover all front panel controls. The unit shall include Bypass relays which automatically operate when power is interupted.

The equaliser shall meet or exceed the following performance specifications:
Frequency Response: ± 0.5dB 20Hz-20kHz (controls “flat”)
Distortion: < 0.01% @ 18dBm @ 1kHz
Eq’v. Input Noise: <- 100dB (20Hz-20kHz unweighted)
Maximum Output level: + 23dBm into 600 ohm load

The equaliser shall operate from a 110/220V ± 15% 50/60Hz supply and be housed in a standard 3U 19″ rack mount case. The equaliser shall be the XTA Electronics GQ600.