ART EQ351 SINGLE 31 BAND EQ

ART?s 351 Single Channel 31 band 1/3 octave graphic equalizer features: constant Q circuitry
with a 3% center frequency accuracy, 20mm center detent sliders, selectable boost/cut range
of 6dB or 12dB, active balanced and unbalanced input and output connect-ions, adjustable high
pass filter, adjustable low pass filter, variable input level control, clip level indicators, ground lift
switch, internal power supply and selectable line voltage switch. A range control switch is provided
which allows you to set the maximum boost or cut for each band of equalization to either 6dB
or 12dB. The high pass filter rolls off lower frequencies which is useful for decreasing rumble or
low frequency hum from a signal . Its range is adjustable from 10Hz to 250Hz. Frequencies below
this setting are rolled off, while frequencies above are unaffected. The low pass filter rolls off higher
frequencies which is useful for reducing hiss or sibilance from a signal. Its range is adjustable
from 3kHz to 40kHz. The rugged, all-steel constructed chassis occupies 1U rack space and is
intended for installation in standard 19" equipment racks.
Multiple input and output configurations are provided for ease of use and incorporate paralleled
connections. The XLR and 1/4" TRS connectors use active balanced, low noise circuitry. XLR
connections are: Pin 1 = ground, Pin 2 = Hot (+), and Pin 3 = Cold (-). The 1/4" TRS connections
are: Tip = Hot (+), Ring = Cold (-), and Sleeve = ground. Both the XLR and 1/4" connectors may
be used in an unbalanced configuration. The RCA jacks are unbalanced. The 351 is designed to
work with a variety of signal levels. The input level control covers a wide range and can easily
accommodate -10 and +4 signal lev els. A clip LED will light when a signal level of 5dB before
clipping occurs.
The 351 may be used in a variety of applications such as live sound, recording studios, instrument
racks as well as any conventional fixed installation environment. Use the 351 equalizer wherever
precise modification of the frequency contour of a sound is needed. The 351 graphic equalizer is a
powerful tool for solving a number of audio problems and creating interesting sound textures. Patch
the EQ between your mixing console and power amps to allow you to alter the overall mix to better
match your environment. Use the 351 between your monitor mixer and monitor power amps to aid in
the removal of feedback inducing frequencies. Patch into a channel insert to EQ one channel or track
individually. Run your instrument directly into the equalizer to enhance its sound before reaching a
power amplifier or instrument amplifier. Patch the 351 into the effects loop of an instrument amplifier
or between a preamp and power amp to have precise control over the complete sound.

The 351 Single Channel 31 Band Eq has the features and performance you need for any of your audio
applications requiring equalization. For the latest in equalizer technology today, check out the 351 at
your favorite ART dealer.

351 - Single 31 band EQ Features:

Single Channel 31-Band Graphic Equalizer
Constant-Q Filtering
Balanced XLR, Active Balanced 1/4“, and Unbalanced RCA Input and Output Connectors
+/- 6dB or +/-12dB Level Adjustments
20mm Center Detented Frequency Band Sliders
Independent Level and Bypass Controls Per Channel
Designed for Years of continuous, reliable performance
Rugged All Steel Construction
One Year Warranty

• 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

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:

1215 Dual 15-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 1215 provides standard
features like dual channels, 15 2/3 octave bands, ISO frequency
centers, +/-12 dB input gain range, and switchable 40Hz/18 dB per
octave low-cut filters, but also includes other thoughtful 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 2U steel/aluminum chassis.

•   Switchable boost/cut ranges of ±6 or ±15 dB
•   Electronically balanced/unbalanced inputs
•   Servo balanced/unbalanced inputs
•   RF filtered inputs and outputs
•  XLR, Barrier Strip, and 1/4" TRS connectors
•  -12dB/+12dB input gain range
•  18dB/octave 40Hz Bessel low-cut filter
•  Chassis/signal ground lift capability
•  Internal power supply transformer
•  Power-off hardwire relay bypass with 2-second power-up delay

INPUT

Connectors: 1/4" TRS, female XLR (pin 2 hot)

Type: Electronically balanced/unbalanced, RF filtered

Impedance: Balanced 40k ohm, unbalanced 20k ohm

Max Input Level: >+21dBu balanced or unbalanced

CMRR: >40dB, typically >55dB at 1kHz

OUTPUTS

Connectors: 1/4" TRS, male XLR (pin 2 hot)

Type: Impedance-balanaced/unbalanced, RF filtered

Impedance: Balanced 100 ohm, unbalanced 50 ohm

Max Output Level: >+21dBu balanced/unbalanced into 2k ohm or greater

>+18dBm balanced/unbalanced (into 600 ohm)

SYSTEM PERFORMANCE

Bandwidth: 20Hz to 20kHz, +0.5/-1dB

Frequency Response: 50kHz, +0.5/-3dB

Dynamic Range: Typically >112dB

Signal-to-Noise: Typically >95dB

THD+Noise:

• 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