LA AUDIO EQ-231G-SP ANALOGUE 2X31 BAND GRAPHIC EQUALISER

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.

Digital stereo active crossover with 4 inputs and 8 outputs, incl. software .

• Flexible routing configurations for all standard mono and stereo output operating modes
• 4 analog inputs and 8 analog outputs (XLR)
• Active frequency filter types (Bessel, Butterworth and Linkwitz-Riley) with slopes up to 24 dB/octave split up the audio signal into different frequency bands
• Incl. software editor (for PC and Mac) for remote control via computer through USB interface: store, transfer, and manage your presets
• Up to 30 user presets storable in the device via software
• 5 menu languages selectable (German, English, French, Spanish, Dutch)
• Alphanumeric LCD screen with 2 lines of 16 characters each
• Input sensitivity digitally adjustable
• Inputs and outputs with 4-digit LED level meter as well as clip and limit LED indicator
• Mute switch with LED indicator per output
• 7-band parametric EQ per output
• Up to 7 ms signal delay adjustable for the outputs
• Output limiter with adjustable limits and automatic attack and release settings as overload protection for your amplifying system
• Switchable phase
• Lock function for prevents undesired changes to settings
• Rack installation, 1 U
• Windows XP, Vista, 7, 10 and Mac OS X 10.5.8 and better
• Digital signal processor
• The device can be connected via USB to the PC in connection with DXO Software The firmware can be updated via the PC connection
• (19") 48.3 cm rack installation 1 U

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:

The class-A circuit used in the EQ-73 is similar to the eq section in the classical 1073 module, without the high pass filter. Additional frequencies have been added and the mid frequency band uses two inductors, the higher value of the second one is used for the two lowest frequencies, 160 Hz and 240 Hz, to achieve a suitable response.

The sound character is warm, punchy, sweet and musical. These classic characteristics have been heard on countless recordings through the years and it is a versatile sound that works very well on most sound sources and in most genres. The essence of this sound is now available at a surprisingly low cost, making it available to nearly everyone.

The EQ-73 has stepped frequency controls that offers a wide selection of frequencies from 20 Hz to 24 kHz.

The Low and High frequency bands are shelving and the mid frequency band is of the bell type.

The control range is +/-15 dB for the two lower bands and +/- 18dB for the high frequency band.

There are separate bypass switches for all three bands.

The EQ-73 is made to be used together with one of our PRE-73 models that has an Insert jack. It can also be used with many other units that has a low level insert jack.

Combining a PRE-73 and an EQ-73, and using a UNITE rack kit to mount them together, one will get a 19-inch 1073-style unit at a low cost and with a great sound!

FEATURES

- Vintage Style electronics. No intergrated circuits in the signal path

- 3-band with a dual inductor based mid frequency band

- Stepped frequency selection

- A wide selection of frequencies from 20 Hz to 24 kHz

- Control range up to +/- 18 dB

- Separate Bypass switches for each band

- Tantalum capacitors in the signal path

- Made to be used together with one of our PRE-73 models with an Insert jack or any other unit with a low level Insert jack

- TRS jack for in-and output connection, the nominal working level is around 18 dBu

- Selectable ground lift switch

- External power supply to avoid interaction with the audio circuits

- Great sound that suits most sound sources and genres

- A solid build quality that will last many years of normal use

• Professional 15-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 low-cut filter removes unwanted frequencies, e.g. floor rumble

• Highly accurate 4-segment LED output metering and input gain controls for easy level setting
• 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*
• Designed and engineered in Germany