Classic Recording Studio Equipment

Vintage Digital

Weiss EQ1

Weiss EQ1 Dual 7 Band Digital Parametric Equalizer

The Weiss EQ1 is a seven-band stereo equalizer in a league of its own. It is no coincidence that it has been a staple at world-class mastering and mixing studios for decades.

Weiss EQ1 Dual 7 Band Digital Parametric Equalizer Details

Use Weiss EQ1 to sculpt the tonal qualities of any audio material without generating the artifacts typically produced by other equalizers, be they analog or digital.

Basic Weiss EQ1 functions
The Weiss EQ1 is available in four different configurations. The basic model is the EQ1-MK2, the linear phase model is the EQ1-LP, and the dynamic model is the EQ1-DYN. Lastly, the EQ1-DYN-LP incorporates both LP and DYN versions in one unit. All models are user-upgradeable to any other version.

The Weiss EQ1’s basic features are common to all four models, namely the seven identical parametric bands that cover the entire audio frequency range. Each band has Boost/Cut, Frequency, and Q/Slope knobs and operates in any of the following modes: High shelving, low shelving, peaking, high cut, low cut, or bypass.

Snapshots, MIDI, Metering
Other basic features are an A/B compare memory, a 128-position snapshot bank with two additional banks for back-up (can also be dumped/recovered via MIDI), a peak meter with over indicators, MIDI control for each parameter, a bypass switch, a gain control, and a channel ganging switch.

M/S Mode
The Weiss EQ1 can be switched to M/S mode which is especially useful for the dynamic model of the Weiss EQ1. Other specialties are variable slope shelving filters and very high-Q (up to 650) peaking filters for notching out offending frequencies.

Controls, Display
There are three knobs for each of the seven bands, in order to provide “one knob per parameter” operation. The knobs are touch-sensitive which triggers the LCD to display the parameters of the touched band. The LCD shows the overall frequency response, the detailed parameter values, and various status information.

Signal processing, Connectivity
The internal processing is done at 88.2 or 96 kHz in a 40 Bit floating-point format. A very low noise filter architecture optimized for audio is used. The digital input/output are in AES/EBU format on XLR connectors. The AES/EBU output can be POW-R dithered to 16, 20 or 24 Bits.

Specifications

Released

AES/EBU Input

  • Sampling frequencies: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz.
  • Maximum input word-length: 24 Bits.
  • Channel Status Data: Input accepts professional or consumer format.
  • Channel Status Data Bits forwarded to AES/EBU output: see table below.
  • Connector: XLR female.


AES/EBU Output

  • Sampling frequencies: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz (always the same as the input).
  • Output word-length: 24 Bits.
  • Connector: XLR male.

 

Filters

The filter topology used in the EQ1 is a very low noise filter structure for state-of-the-art performance.

  • Center/corner frequencies: 13.8 – 21096 Hz
  • Boost/Cut: -39 – +18 dB
  • Q, peaking filters: 0.20 – 650
  • Shape, shelving filters: 1 – 128
  • Threshold, dynamic peaking filters: 0 – -60 dB
  • Slope, cut filters: 0, 6, or 12 dB/octave
  • Overall gain: 0 – +10 dB

Dimensions

  • Depth: 30 cm / 11.8 inches
  • Width: 43.3 cm / 17 inches (19 inches with rack ears)
  • Height: 8.8 cm / 3.5 inches (2 RU)

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The details provided above are drawn from historical documents like advertising brochures or user manuals. They’re shared without bias or review. This info is given solely for your consideration, helping you gauge its usefulness to you.

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The EQ1’s dazzling sonic qualities combined with its flexibility as either a Minimum Phase EQ, a Linear Phase EQ, or a Dynamic EQ have made it the must-have digital mastering equalizer. The Weiss EQ1 plug-in crystallizes that legacy—in software form.

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