EQ1 – Weiss Engineering (2024)

BASIC EQ1 FUNCTIONS

The 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 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 EQ1 can be switched to M/S mode which is especially useful for the dynamic model of the 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 96kHz 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.

• 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.
• Connector: XLR female.

• 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.

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: Minus infinity – +10 dB

• 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)

It goes without saying that the thing sounds great, but the interface is fantastic! I can tell that it is going to be a real pleasure to work with. I didn’t realize how great the ergonomics were… I have been dreaming of your stuff for years, and suddenly I am in Weiss heaven!

Colin Jordan

Once you’ve worked with such a quality-made, over-the-top engineered digital processor, you can really see how one’s job can be made easier using such tools.

Larry Devivo