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The EQ231-GSP is a highly versatile combination of dual 31 band 1/3 Octave
Graphic Equaliser, LF and HF variable frequency Shelving Equaliser, variable
High and Low Pass filters and Limiter-Noise Gate.
The band pass filters are based around precision minimum phase active RC
networks to deliver superior dynamic range and signal to noise performance.
An optional Inductor board may be specified for the top eight frequencies (4kHz-20kHz)
to further improve noise and phase linearity. Long throw faders provide maximum
sensitivity and control of 12dB cut and boost at 31 ISO centre frequencies covering
the entire audio spectrum (20Hz to 20kHz).
The Shelving Equaliser section offers continuous adjustment of boost/cut and
corner frequency. This allows an engineer to tailor the sound without altering the
graphics settings. The High and Low Pass filters use 4th order bi- quadratic topology
to offer 24dB/octave slope and superior stability. The Dynamics section uses a fast
RMS detector with soft-knee characteristics. The Limiter features a Threshold control
and 3-segment gain reduction display. The Noise Gate features a Threshold Control
and Gate Closed indicator.
The EQ231-GSP has electronically balanced inputs and outputs on XLR, with front
panel phase reverse switches on the outputs. An optional Transformer Output module
is available, featuring Active Distortion Cancellation circuitry that reduces to negligible
levels the LF distortion inherent in Passive Transformer designs. Power relays ensure
silent power on/off and also automatic bypassing of the unit when switched off. All
switches are indicated with status LED's. Each channel incorporates an input level
control with clip LED and may be individually bypassed.
The EQ231-GSP is built in accordance with Electro-Magnetic Compatibility (EMC)
regulations encompassed within the European ''CE' mark. This guarantees problem
free integration into audio systems.
Main Features
Dual 31 band 1/3 octave Graphic Equaliser
LF and HF Variable Frequency Shelving Equaliser
Variable Low and High Pass filters
Gate and Limiter Dynamics section
Relay based 'soft' power up and automatic power off bypass
Input level control with Peak LED
Channel bypass switches with LED
Output Transformer option with unique Active Distortion Cancellation circuitry
Inductor option for improved noise and phase response on high frequencies
Specifications
Frequency Response 20 Hz - 20 kHz, -1dB
Signal to Noise Ratio @ +4dBu output -96dB
Input impedance 20 kΩ balanced
Output impedance 100Ω balanced
Maximum Output Level
(into 600Ω Load, 1 kHz, 600 Ohms Load)
+20dBu
Total Harmonic Distortion
(1kHz, +4dBu Output)
0.003 %
Peak indicator Threshold 2dB before clipping
Centre frequencies :
20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1k,
1k25, 1k6, 2k, 2k5, 3k15, 4k, 5k, 6k3, 8k, 10k, 12k5, 16k, 20k.
Limiter Threshold -6 to +20dBu
Gate Threshold -70 to -20dBu
Limiter Ratio 20:1 soft-knee
Gate Ratio 10:1 soft-knee
Hi-Pass Filter corner frequency 16Hz to 160Hz
Hi-Pass Filter slope 24dB/Octave Butterworth
Lo-Pass Filter corner frequency 3KHz to 32KHz
Lo-Pass Filter slope 12dB/Octave Butterworth
LF Shelving EQ Frequency 16Hz to 160Hz
HF Shelving EQ Frequency 2.5KHz to 25KHz
Power Consumption
(115/220 VAC, 50-60 Hz)
15 Volt-Amps
Weight 7.2 kg
Dimensions (mm) 483 W x 230 D x 135 H
Note: 0dBu is referenced to 0.775 V RMS.
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DBX 2215 Dual 15-Band Graphic Equalizer with Noise Reduction
It's amazing. One little button. So much effect. dbx? Type III? Noise Reduction is an entirely new concept... virtually instantaneous encode/decode within the circuitry of the box. We started out to build the finest EQs possible, boxes with the heritage and performance to rival our famous 30 Series EQs. And to no one's surprise they came out awfully darn good. (Ask to see the Audio Precision plots compared to the competition.) But then, Roger (our chief engineer, a nice guy, as far as engineers go) got the crazy idea of putting this new noise reduction stuff in the box. We listened to it and were amazed. The EQs sounded great without it but with it the performance was nothing short of incredible. Check it out yourself and see.
But hey, Roger wasn't about to stop there. PeakPlus? Limiter. Who knows more about limiting than the folks at dbx; nobody... that's who. So when the guys were developing this new series of EQs they wanted something that would be unique to these EQs. That's when Roger got another one of his bright ideas and said "I bet they'll work a lot better if there's a cool limiter built in." Next thing you know, all the guys are in the studio amazed at the new limiter Roger had designed specially for the 20 Series. Once again, hearing is believing... With a threshold range of 0dbu to plus 20dbu, the patent-pending PeakPlus limiter is designed to tame your program material from the subtlest nuances to the rowdiest hits. Also, the four stage LED ladder gives you a great visual indication as to what the limiter is doing.
20 Series EQs. You used to have to settle for second best in a reasonably priced EQ but not any more. With the new 20 Series from dbx Professional Products you get a great EQ circuit, a graceful yet powerful limiter and the revolutionary new design of the Type III Noise Reduction. Check out the dbx 20 Series graphic EQs at your pro audio outfitter. You'll see, with the 20 Series EQs you get MORE!!!
SPECIFICATIONS:
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INPUT
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Connectors:
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1/4" TRS, female XLR (pin 2 hot), and barrier terminal strip
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Type:
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Electronically balanced/unbalanced, RF filtered
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Impedance:
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Balanced 40k ohm, unbalanced 20k ohm
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Max Input Level:
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>+21dBu balanced or unbalanced
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CMRR:
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>40dB, typically >55dB at 1kHz
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OUTPUTS
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Connectors:
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1/4" TRS, male XLR (pin 2 hot), and barrier terminal strip
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Type:
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Impedance-balanaced/unbalanced, RF filtered
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Impedance:
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Balanced 200 ohm, unbalanced 100 ohm
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Max Output Level:
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>+21dBu balanced/unbalanced into 2k or greater
>+18dBm balanced/unbalanced (into 600)
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SYSTEM PERFORMANCE
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Bandwidth:
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20Hz to 20kHz, +/-0.5dB
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Frequency Response:
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50kHz, +0.5/-3dB
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Noise Reduction In:
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(+/-6 and +/-15dB range):
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Signal-to-Noise:
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>102dB, unweighted, ref: +4dBu, 22kHz measurement bandwidth
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Dynamic Range:
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>120dB, unweighted
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Noise Reduction Out:
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(+/-6dB range):
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Signal-to-Noise:
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>94dB, unweighted, ref: +4dBu, 22kHz measurment bandwidth
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Dynamic Range:
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>112dB, unweighted
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Noise Reduction Out:
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(+/-15dB range):
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Signal-to-Noise:
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>90dB, unweighted, ref: +4dBu, 22kHz measurement bandwidth
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Dynamic Range:
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>108dB, unweighted
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THD + Noise:
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| | 1231 Dual 31-Band Graphic Equalizer
The dbx? 12 Series were designed to meet the needs of the most demanding sound reinforcement environments, while offering the simplicity of straightforward controls. The 1231 provides standard features like dual-channels, 31 1/3 octave bands, ISO frequency centers, +/- 12 dB input gain range, and switchable 40Hz/18 dB per octave low-cut filters, but also includes other insightful features. These include 45 mm faders; selectable +/-6dB or +/-15dB boost/cut range for precise gain adjustments; XLR, barrier strip, and 1/4'' TRS connectors for installation ease; balanced inputs and outputs for quiet operation; and chassis/signal ground lift capabilities for quick hum isolation. The visionary design of the dbx 12 Series makes your job easier.
The dbx 12 Series Equalizers were precision engineered to provide years of maintenance-free operation in any application. The magnetically isolated transformer, electronically balanced/unbalanced inputs and servo balanced/unbalanced outputs, RF-filtered inputs and outputs, and power-off hard-wire relay bypass with 2 second power up delay were steps our engineers took to ensure compatibility for all installations. Only the best components were utilized, yielding a 10Hz to 50kHz frequency response, greater than 90dB SNR (ref +4dBu), less than 0.005% THD +Noise (1kHz at +4dBu), and interchannel crosstalk of less than -80dB from 20Hz to 20kHz. All this attention to detail is contained in a 3U steel/aluminum chassis.
SPECIFICATIONS:
| INPUT |
| Connectors: |
1/4" TRS, female XLR (pin 2 hot), and barrier terminal strip |
| Type: |
Electronically balanced/unbalanced, RF filtered |
| Impedance: |
Balanced 40 kOhm, unbalanced 20 kOhm |
| Max Input Level: |
>+21dBu balanced or unbalanced |
| CMRR: |
>40dB, typically >55dB at 1kHz |
| OUTPUTS |
| Connectors: |
1/4" TRS, male XLR (pin 2 hot), and barrier terminal strip |
| Type: |
Impedance-balanaced/unbalanced, RF filtered |
| Impedance: |
Balanced 200 ohm, unbalanced 100 ohm |
| Max Output Level: |
>+21dBu balanced/unbalanced into 2 kOhm or greater
>+18dBm balanced/unbalanced (into 600 ohm) |
| SYSTEM PERFORMANCE |
| Bandwidth: |
20Hz to 20kHz, +0.5/-1dB |
| Frequency Response: |
50kHz, +0.5/-3dB |
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+/-15dB range |
+/-6dB range |
| Dynamic Range: |
109dB |
115dB |
| Signal-to-Noise: |
90dB |
97dB |
| THD + Noise: |
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| PRICE WITHOUT V.A.T.
BSS Opal FCS-966 Constant Q Graphic Eq
Graphic equalisers are found in just about every sound application, from room contouring to feedback control and general audio sweetening.
Traditionally, much general eq'ing takes place on the faders alone, but this restricts the use of the faders at each end of the scale for further precision eq work. So we provided the Opal FCS-966 with separate LF and HF contour filters which can change an overall sound balance without disturbing a detailed room or loudspeaker response.
These filters are very musical gentle boost and cut shelving filters which can be used to add (or remove) room effects that change with temperature, audience numbers or humidity.
All these effects can be easily made without disturbing the critical fader settings already made.
Constant Q Filters
The modern generation of graphic eq's
uses the Constant Q topology, pioneered by BSS Audio, which means that the filter width is constant whatever the fader gain setting.
Compared to the earlier 'gyrator' style of filters, Constant Q filters provide a smoother and more predictable interaction between adjacent faders and the resulting eq curve more closely resembles the actual fader positions.
More Gain Control Per Filter
Each eq fader has +/-15dB of adjustable gain, more than many competitive graphic eq's. The faders are long-throw 45mm types for precision control.
High Pass Filter
Also provided on the FCS-966 is a sweepable high-pass filter which can be used very effectively to restrict the low-energy output for better amplifier and loudspeaker performance. Stage monitors also benefit from the application of a high-pass filter to remove bass signals e.g. from vocal-only wedges.
Metering
BSS Audio believes in providing engineers with information, and the FCS-966's 8-segment led meter shows output level and warns of signal clipping within the eq. When the unit is switched to bypass, the meter will read the input level, allowing accurate matching of the 'dry' and equalised signals using the gain control.
Centre Bypass
When any eq fader is in its centre detent position, the filter is automatically bypassed, for optimum performance.
Input/Outputs
All the inputs and outputs of the FCS-966 are electronically balanced, with optional transformer balancing. To make installation of the FCS-966 easier, we've provided three differerent interface connectors: XLR-type, 1/4" TRS jack and Phoenix/Combicon screw terminals.
Relay Bypass
The EQ IN buttons switch the EQ path
into circuit. When switched out, or power fails, a high-quality relay switches the input signal directly to the output connectors.
Control Descriptions
Faders
30 EQ filter faders on ISO centres, each with nominal +/-15dB of gain. Positive centre-detent on 45mm long-throw precision faders.
HP Filter
Sweepable high pass filter, frequency adjustable from OUT (flat) up to 250Hz.
LF Contour
Smooth shelving filter, +/-6dB of gain at 50Hz
HF Contour
Smooth shelving filter, +/-6dB of gain at 14kHz.
GAIN
Used for overall unity gain adjustment. Adjustable from - infinity to +10dB.
CLIP
Triple-point clip detector that indicates red when the internal signal is clipping at any one of three critical points.
LED Meter
Shows output signal level (input signal when eq is bypassed) from -24dBu to +18dBu in 8 steps. |
Phonic's GEQ3102F is the authentic soundman's choice of EQ - a dual channel 31-band equalizer, offering 6 or 12 dB of cut or boost on standard ISO center frequencies between 20 Hz and 20 KHz. The GEQ3102F is 2-rack space units high and accepts both 1/4" TRS phone jacks and XLR connectors, making it ideal for any studio or live venue setup.
- Sweepable high and low cut filters on each channel to remove unwanted frequencies
- Ultra low-noise audio operational amplifiers offer outstanding sound performance
- Relay-controlled hard-bypass with an auto-bypass function during power failure
- Dedicated subwoofer output with user-adjustable low-pass filter
- Feedback detection circuitry for indicating critical frequencies
- Balanced inputs and outputs with 1/4" TRS and XLR connectors
| High-Definition 31-Band Stereo Graphic Equalizer with FBQ Feedback Detection System
- Professional 31-band stereo graphic equalizer for live and studio applications
- Revolutionary FBQ Feedback Detection system instantly reveals critical frequencies and can also be used as audio analyzer
- Ultra-low noise 4580 operational amplifiers for highest signal integrity
- Dedicated mono subwoofer output with adjustable crossover frequency
- Additional sweepable high and low-cut filters for each channel remove unwanted frequencies, e.g. floor rumble, hiss etc.
- Highly accurate 12-segment LED input/output metering and input gain controls for easy level setting
- Relay-controlled hard-bypass with an auto-bypass function during power failure (fail-safe relay)
- Servo-balanced inputs and outputs with 1/4" TRS and gold-plated XLR connectors
- “Planet Earth" switching power supply for maximum flexibility (100
- 240 V~), noise-free audio, superior transient response plus low power consumption for energy saving
- 3-Year Warranty Program*
- Conceived and designed by BEHRINGER Germany
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