Rane GQ 15, GQ 30 User Manual

Professional Audio Products Data Sheet

GQ Series Interpolating Constant-Q Equalizer

GQ 15 & 30

GRAPHIC EQUALIZERS

General Description

The Rane GQ Series Interpolating Constant-Q Equalizers
consist of the GQ 15, a two-channel, 2/3-octave design and
the GQ 30, a one-channel, 1/3-octave version. Housed in a
two rack-space unit, these units feature long throw 45mm
sliders for excellent resolution of settings, as well as adjust­able bandlimiting Low and High Cut Filters.

The active filter sections of these units feature Ranes
patented (#4,891,841) constant bandwidth (constant-Q)
design. The bandwidth of each individual filter is guaranteed
to be narrow enough to prevent unwarranted interaction
between filters, yet wide enough to produce the optimum type
of correction curve demanded by the the most unusual
acoustic surrounding. This differs dramatically from conven­tional designs of the past. Earlier designs are encumbered
with the unfortunate characteristic of changing bandwidth
with changing boost/cut amounts.

The GQs, aside from being constant-Q devices, also

Features

 INTERPOLATING CONSTANT-Q DESIGN

 ADJUSTABLE LOW & HIGH CUT FILTERS

 TERMINAL STRIP, 3-PIN, & ¼" TRS BALANCED

INPUTS AND OUTPUTS

 GROUNDED CENTER DETENTS

 INDEPENDENT INPUT AND OUTPUT LEVEL

CONTROLS

provide what Rane has dubbed Interpolating performance.
This means that when two adjacent bands are boosted or cut
to the same level, the response of the equalizer peaks (or
interpolates a response) at a frequency centered between the
filters. Interpolating performance allows effective control
between ISO centers.

Front panel controls and indicators include an input and
output gain control as well as individual overload indicators.
The rear of the unit provides balanced 3-pin input and output
connectors; a ¼" balanced Tip-Ring-Sleeve connector for the
same, and a barrier strip which provides access to all of the
above. This full range of connectors also allows unbalanced
operation by using only the positive and signal ground
conductors of any of the Inputs or Outputs. Included also are
¼" Tip-Ring-Sleeve Patch I/O jacks. These allow connecting
to conventional tip-send ring-return insert points on mixing
consoles using only a single ¼" TRS cable.

 INDIVIDUAL BYPASS SWITCHES WITH LED

INDICATORS

 OVERLOAD INDICATORS

 RFI FILTERS

 CLASS 2 POWER - AGENCY EXEMPT

 UL LISTED POWER SUPPLY

 U.S. PATENT 4,891,841

GQ 15 & GQ 30

Professional Audio Products Data Sheet

GRAPHIC EQUALIZERS

Parameter Specification Limit Units Conditions/Comments

Equalizer:

..........Bands: GQ 15 (15) 2/3-Octave ISO Spacing From 25Hz to 16kHz

...................... GQ 30 (30) 1/3-Octave Iso Spacing From 25Hz to 20kHz

..........Type Interpolating Constant-Q Smooth Combining

..........Accuracy 3 % Center Frequency

..........Travel 45 mm Positive Grounded Center Detent

Inputs: Type Active Balanced/Unbalanced

..........Connectors Term, 3-Pin & + ¼" TRS•••

..........Impedance 40k 1% Ohms Balanced: 20k Ohms/leg

..........Maximum Level +21 1 dBu

Outputs: Type Active Balanced

..........Connectors Term, 3-Pin & + ¼" TRS•••

..........Impedance 100 1% Ohms Each Output

..........Maximum Level +27 ³ 2k•; +24 ³ 600• 1 dBu

Overall Input Gain Range -12 to +12 1 dB
Overall Output Gain Range +12 to -12 1 dB
Adjustable Low Cut Filter 10Hz-250Hz, 12dB/Oct 10% Hz
Adjustable High Cut Filter 3.1kHz-40kHz, 12dB/Oct 10% Hz
RFI Filters Yes
Passive Bypass Switches Yes LED Indicated
LED Thresholds: Overload +18 1 dBu Output or any Internal Level
Frequency Response 10-40kHz 10 % -3dB Points
THD+Noise 0.009 .002 % +4dBu, 20-20kHz
IM Distortion (SMPTE) 0.005 .003 % 60Hz/7kHz, 4:1, +4dBu
Signal-to-Noise Ratio re +20dBu/+4dBu 20kHz Noise BW; Balanced

108/92 2 dB Sliders Flat, Gains Up (Unity)
91/75 2 dB Full Boost, Gains Up (Unity)

106/90 2 dB Full Cut, Gains Up (Unity)
Channel Separation (GQ 15) 70 5 dB 20-20kHz
Maximum Current 400 mA RMS Current From Remote Supply
Power Supply Input 18-24VAC w/center tap 10% Vrms
Power Supply Connector 6-Pin Mod Plug
Safety Agency—Unit

..........Classification Class 2 Equipment National Electrical Code

..........Design Safety Extra-Low Voltage VDE SELV

..........U.L. Listing UL 813 Exempt Class 2

..........C.S.A. Certification C22.2 No. 1 Exempt Class 2

..........CENELEC IEC 65 Exempt Harmonization Doc. HD 195.S4

Remote Power Supply Model RS 1 Class 2 Equipment

..........U.L. Listed E90493

..........C.S.A. Certified LR62694

..........230VAC Export Model Meets requirements of IEC 380 Double Insulated Design

Unit: Construction All Steel

..........Size 3.5"H x 19"W x 8.5"D (2U) (8.9cm x 48.3cm x 21.6cm)

..........Weight 7 lb (3.2 kg)

Shipping: Size 7" x 22" x 13" (18cm x 56cm x 33cm)

..........Weight (GQ 15) 12 lb (5.4 kg)

..........Weight (GQ 30) 12 lb (5.4 kg)

Note: 0dBu=0.775Vrms