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HQ31 - Pro Single 31 Band EQ w/ FDC? Overview
The HQ SERIES HQ-31 features ART?s FDC Feedback Detection Circuitry. The A R T proprietary
FDC differs from similar systems in that it is extremely fast. Although it illuminates the band with
the greatest energy with the brightest LED, it doesn't fully discriminate between bands and will not
get "stuck" on one band when there is no signal.
The HQ-31 utilizes a set of indicators that show which of the many EQ bands has the greatest energy.
The LED indicators can immediately show which band corresponds to the feedback frequency, allowing
the sound engineer to reduce gain in that band to quickly kill the feedback while having a minimal impact
on the sound of the live program material.
FDC also acts as a simple spectrum viewer while the concert proceeds showing where the ?hot? areas
are. During system setup and sound check, the FDC may be used to help identify room and sound system
resonances. By increasing the gain until feedback, it is easy to identify those frequencies that are likely
to be problems. Reducing the gain in these bands helps tune the sound system, and, remove problem
areas before the show begins. It also helps increase the gain margin before feedback.
The HQ31 also features Constant-Q circuitry, 45mm center detent sliders with selectable boost or cut
range of 6dB or 12dB, balanced XLR, Ό? and unbalanced RCA input and output connections, high and
low pass filters, analog level metering, variable input controls, signal clip level indicators, ground lift switch,
internal power supply and selectable line voltage. The rugged, all-steel chassis occupies 2U rack spaces
and is intended for installation into standard 19? equipment racks.
Applications for the HQ-31 include: Live Sound Systems/PA, Permanent or Fixed Installations, Church,
Club and Practice PA Systems, DJ Sound Systems, Home and Project Recording Systems, and Monitor
Systems.
HQ31 - Pro Single 31 Band EQ w/ FDC? Features:
FDC? Feedback Detection Circuit
Single Channel 31-Band Graphic Equalizer
Output Level VU Metering on Each Channel
Constant-Q Filtering
Individual High and Low pass filters
Full 45mm Center-Detented Frequency Band Sliders
Independent Level and Bypass Controls on Each Channel
Relay Bypass - If Power is Lost, Signal Will Still Pass
Occupies 2 Rack Spaces
Variable Input Controls
Signal Clip Level Indicators
Ground Lift Switch
Internal Power Supply
Selectable Line Voltage |
The AD2055 combines 100% discrete, pure class A signal amplifiers with state-of-
the-art passive and active filter topologies. The AD2055's unique circuitry delivers
very high resolution transient detail at the operational extremes of real world equalization
demands. The AD2055 auto-bias DC servo loop control eliminates the need for all
interstage capacitor coupling. The AD2055 breathes life into all musical performances!
AD2055 FEATURES
Pure Class A, 100% discrete design
Smooth musical detail and sonic excellence
Minimum audio signal path
Dual mono operation
Transparent active and passive filter design
High headroom +30dB Very low noise -94dB
Fully balanced inputs and outputs
DC coupled, no transformers in audio path
Switched frequencies in high and low bands
Mid bands use X10 frequency for extended range
Wide bandwidth -3dB 1Hz to 450kHz
Low distortion less than 0.5% THD and IMD
All signal routing with sealed silver relays Conductive
plastic potentiometers for low noise
External 150W toroidal power supply 100% discrete
power supplies for audio path
Long lasting, stainless steel hardware
SONIC EXCELLENCE
The Avalon AD2055 Pure Class A music equalizer is the most powerful, low noise
parametric equalizer available today. Designed to optimize absolute signal integrity
and musical performance, the AD2055 combines the best of active and passive filter
topologies with sonic excellence unequaled by lesser designs. The AD2055 is the
perfect solution for two buss music-program equalization, special instrument EQ and
FX applications and ultra high performance mastering studio's.
Features include state-of-the-art, balanced 100% discrete, Pure Class A signal amplifiers,
practical user features and rugged hardware designed to deliver true high performance
audio for many years.
PASSIVE-ACTIVE FILTER DESIGN
Avalon equalizers feature the unique combination of both active and passive filter EQ designs.
This special combination enables the AD2055 to deliver high speed transient detail at the
operational extremes of real-world equalization demands. The passive high and low bands offer
alternate musical tone range to the full function active parametric mid bands. Passive equalizers
have long been a favorite with music lovers around the world. Full bodied, powerful (up to +/-32dB,
64dB range !) and sweet frequency selections are the benefits of the passive high-low EQ bands.
The full bandwidth twin mid bands provide variable frequency selection (X10 frequency multipliers
for very wide range), variable Q (width) and amplitude control.
MINIMUM SIGNAL PATH DESIGN
Avalon's advanced true symmetry design offers high-voltage, large headroom, extended bandwidth
and very low noise. The use of 100% discrete, Pure Class A signal amplifiers give the serious music
professional unlimited sonic character and a natural harmonic detail that enhances the program
material and becomes one with the music itself. The Avalon AD2055 breathes life!
AD2055 SPECIFICATIONS
Circuit Topology High-voltage 100% discrete, balanced and symmetrical
Class A
Output Gain Range Unity Gain
Maximum Input Level +30dB balanced XLR pin 2 hot
Maximum Output Level +32dB balanced 600 ohms, DC coupled, high-current
discrete Class A
Input / Output Type XLR type, pin 2 hot balanced
Noise 20kHz Unweighted -94dB (EQ in)
Distortion THD, IMD 0.5% (typical 0.05% at +6dB 1kHz)
Frequency Response -3dB 1Hz to 450kHz (input band limited)
Equalizer Type Passive high and low bands plus two fully parametric mid
bands
Bypass Hard-wire relay bypass for equalizer in-out
Low Band F1 Passive, amplitude to -32dB to +32dB shelf or peak-dip curve
F1 Frequency Range Switched 10 position 18Hz, 25, 30, 50, 72, 100, 150, 215,
300, 450Hz
Mid Band F2 Active, amplitude to -16dB to +16dB peak-dip curve
F2 Frequency Range Variable 35Hz to 450Hz (x10) 350Hz to 4k5Hz, Q (width)
0.3 to 3.0
Mid Band F3 Active, amplitude to -16dB to +16dB peak-dip curve
F3 Frequency Range Variable 160Hz to 2k0Hz (x10) 1k6Hz to 20kHz, Q (width)
0.3 to 3.0
High Band F4 Passive, amplitude to -26dB to +26dB shelf or peak-dip curve
F4 Frequency Range Switched 10 position 1k5Hz, 2k5, 3k5, 5k, 7k2, 10k, 12k5,
15k, 20k, 25kHz
AC-DC Power External AC supply, 150w toroidal transformer, 4 pin cable 90v
isolated,
(B2T Power Supply Included) 100-240v selectable 50/60Hz, 150w max
Dimensions 19 x 3.5 x 12 in (482 x 88 x 305mm)
Shipping weight 30lbs (13.6 kg)
| 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
| Power supply: |
100-240 V AC, 50/60 Hz
6 V DC 800 mA |
| Power connection: |
Mains input via Coaxial power connector (M) power supply cord with AC adapter (provided) |
| Frequency range: |
10 - 22000 Hz |
| THD: |
<0,005 % at 1 kHz |
| DSP: |
Digital signal processor |
| Crossover frequency: |
20-20000 Hz |
| Impedance: |
Input 10 kOhm
Output 50 Ohm |
| Gain: |
Output: -50 dB to +12 dB |
| Filter: |
Linkwitz-Riley; Butterworth; Bessel; 6db/oct; 12db/oct; 18db/oct; 24db/oct |
| Delay: |
0 - 7 ms |
| Dynamic range: |
Input: 114 dB
Output: 110 dB |
| Sample rate: |
48 kHz |
| Connections: |
Input: line via 4 x 3-pin XLR
Output: line via 8 x 3-pin XLR |
| Max. level: |
Input: +22 dBu
Output: +9 dBu |
| USB port: |
Typ B |
| PC connect: |
DXO Software via USB, firmware can be updated |
| Housing design: |
(19") 48.3 cm rack installation 1 U |
| Dimensions: |
Width: 48,3 cm
Depth: 22,3 cm
Height: 4,45 cm |
| Weight: |
1,90 kg |
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The Rane ME 15S microGraphic Equalizer is a two-channel, 2/3-octave design with 20 mm sliders in a single rack space unit. It features a Range switch for high slider resolution in the ±6 dB mode, equivalent resolution to 45 mm sliders found on the DEQ 60L. The ±12 dB mode provides a wide range of control over system audio.
The active filter sections feature Raneʼs innovative constant-Q (constant bandwidth) design. Constant-Q means the bandwidth of each individual filter is guaranteed to be narrow enough to prevent unwarranted interaction between filters, yet wide enough to produce exactly the type of correction curve demanded by even the most unusual acoustic surroundings. This differs dramatically from conventional designs of the past, encumbered with the unfortunate characteristic of changing bandwidth when changing boost/cut amounts.
Front panel controls and indicators include an overall rotary Level control for each channel as well as Overload indicators. Passive pushbutton Bypass switches feature LED indicators, avoiding ambiguity by being on when the unit is Bypassed. (A passive Bypass switch requires no power to operate. This allows completion of the audio path should power fail in the ME 15S.)
Inputs and Outputs are electronically balanced designs, capable of unbalanced operation when required. They accept and drive all possible signal levels into normal load impedances. Balanced applications choose between the XLR or 1/4" Tip-Ring-Sleeve connectors. Unbalanced sources also may tie to the ME 15S through mono 1/4" connectors (no ring connection).
Features - Constant-Q Bandwidth Design
- Overall Level Controls and Passive Bypass Switches
- 20 mm Filter Slide Controls with ±6 dB or ±12 dB Slider Range
- Infrasonic, Ultrasonic, & RFI Filters
- Balanced XLR and 1/4" TRS Inputs and Outputs
- Universal internal switching power supply (100-240 VAC)
| The vintage-style fully stereo 1974 four band Parametric Equaliser provides exceptional analogue musicality and sonic clarity, taking it\'s inspiration from 1970\'s-era gear. It has the ability to perform subtle shaping for mastering purposes that require a delicate touch and easy recall, but is just as capable of tonal sculpting, adding the analogue warmth and character that is near impossible to emulate in the digital domain.
Get immersive with the stereo operation, with one set of controls for both channels. The versatile design features dual channel precision stepped potentiometers, providing exceptional accuracy for fast and simple recall. The fully variable bandwidth allows you to control the parametric mid bands, making adjustments as surgically precise or as broad and natural sounding as you could ever require. Fully adjustable low and high cut filters are also included, ideal for tuning out undesirable signals at the frequency extremes. It also features switchable slopes on the low and high bands, allowing you to alter the focus at the top and bottom frequencies plus a low peak setting that magnifies the bottom end. The 1974 is perfect for tonal shaping, staying true to the sound of the 70s and ideal for any musician.
Genuine Stereo Operation with Indented and Accurate Potentiometers. The genuine stereo linked operation of the 1974 makes adjustment quick and extremely simple using just one set of controls to alter both channels. Gone is the wasted time spent fiddling about on every control trying to match the settings of the left and right channels with each other. The 1974 uses precision potentiometers, each one being matched for left/right accuracy to within fine tolerances by our trained technicians, so that both channels operate identically, and also have indented operation, providing exceptional accuracy for fast and simple recall.
Fully Parametric with Totally Variable Bandwidth. The 1974 is a true \'parametric\' equaliser, with the four bands having fully variable frequency controls and offer cut and boost of +/-12dB\'s. However, unlike EQ\'s with a no bandwidth adjustment, or a simple switch, the two mid bands have completely variable filter bandwidth controls enabling the user to focus in on very narrow sections of the audio spectrum or apply a broad natural sounding filter, or, of course, anything in between the two. This makes the 1974 incredibly versatile and capable of modifying everything from subtly fine tuning mixes to tone sculpting problematic recordings.
Variable Low and High Cut Filters. The 1974 also includes fully variable low and high cut filters, ideal for tuning out undesirable signals. The low cut (otherwise known as High Pass Filter) having a range of 10Hz-225Hz and the high cut (otherwise known as Low Pass Filter) 4kHz-32kHz. The beauty of being fully variable is that, unlike fixed frequency filters, it is easy to sweep both controls to find the perfect setting and remove sounds with pinpoint accuracy. This is especially useful when bracketing individual tracks where it will be necessary to cut the bass to remove rumble and top to remove hiss, as these undesirable signals will just add up as the tracks are layered. For instance, cut everything instrument below 100Hz except those within that spectrum, such as the kick, bass or synths etc to provide extra headroom to work and also tighten up the bass making it sound less muddy. And likewise for the high frequencies.
Switchable Slope Setting. Very few analogue parametric equalisers have an adjustable slope on the low and high band filters, and is yet another feature of the 1974 that allows you to take control of your audio. The filter slopes of the 1974 have been chosen for their musicality - allowing you to adjust the focus of the audio at the bottom and top ends of your recording but not so harsh as to be a very noticeable brick wall filter. At the bottom end slopes of 6, 9 and 12dB per octave plus a Peak setting are available, and at the high end 6 and 12dB\'s per octave.
The Peak setting is quite a unique feature in that it adds a narrow bell shape to the 12dB per octave low band filter at the knee frequency just before it rolls off. Especially useful on kick drums, it magnifies and gives extra weight to the hit whilst still filtering out any subsonic junk and without muddying the lower mid. It\'ll give your kick an added sense of power and precision.
Features:
- Vintage-style four band Parametric Equalisation which takes it\'s inspiration from 1970\'s-era analogue gear.
- Delivers classic sonic clarity and control at an affordable price.
- Genuine stereo operation with one set of controls for both channels.
- Indented and accurate potentiometers, providing precision for quick and simple recall.
- Variable low and high cut filters allow you to perfectly tune out any undesirable signals.
- Fully variable bandwidth provides absolute control for the parametric mid bands.
- Switchable slope plus low peak settings allows you to adjust the focus and magnify the bottom end.
- True hardware bypass for accurate A/B comparisons.
- Internal Low Hum Toroidal Linear Power Supply with Voltage Selector Switch.
- Classic Drawmer Build Quality with Rugged Steel Chassis and Aluminium Front Panel.
- Designed and manufactured by Drawmer in the UK.
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iEQ-15 Dual 15-Band Graphic EQ with Type V? NR and AFS?
With an EQ heritage that has produced countless industry standard
patents and dates back more than 30 years, the dbx iEQ-31 easily
lives up to the dbx legacy of uncompromised sonic integrity. In
addition to unsurpassed equalization specs, the iEQ-15 also offers
the built-in necessities which include AFS? feedback Suppression,
Type V? noise reduction and PeakStopPlus? limiting. Besides
including two 15-band channels of 2/3-octave equalization, the iEQ-15
also offers +12 dB input gain range; switchable +6 or +15 dB boost/cut
range, 40mm faders, XLR, 1/4'' and Euroblock inputs and outputs,
nonconductive nylon sliders; and an intuitive user interface with comprehensive
output and gain reduction metering. As always, the inevitable result of our
meticulous attention to detail and top-quality componentry is exceptional
sound, performance, and reliability.
The iEQ series represents a major step forward in the performance of EQs.
The iEQ series is now able to offer state-of-the-art digital EQ performance
and specs with an analog look and feel. From its amazing 10Hz to 22kHz
frequency response, to its 113dB dynamic range and Advanced Feedback
Suppression (AFS?), dbx proprietary Type V? noise reduction
and PeakStopPlus? limiting, the iEQ-15 offers out of this world specifications
with a downto- earth price point. Sure to find a home in the studio, on tour and
with installed sound venues, the iEQ-15 is destined to take its rightful place in
the lineage of great dbx? signal processors that are the professional?s choice
in signal processing. With such pristine design and quality, the iEQ-15 offers
the maximum sonic flexibility in a straight forward interface and rock-solid construction.
? Advanced Feedback Suppression (AFS?)
? Type V? Noise Reduction
? PeakStopPlus? Limiting
? 2/3-octave Constant Q frequency bands
? Switchable boost/cut ranges of ±6 or ±15dB
? 18 dB per octave 40Hz low-cut filter
? ±12dB input gain range
? XLR, TRS and Euroblock Inputs and Outputs
? Internal Toroidal Transformer
? Frequency Response of 10Hz to 22kHz
? Dynamic range of greater than 113dB
? User Power Up Features
? Relay Bypass for Power Failure System Protection
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