Pro Audio

GET IT RIGHT AT THE SOURCE

MICROPHONE PREAMP WITH DE-ESSER

Get the recording right from the start. The A1 is a precise and natural-sounding microphone and line preamp, paired with a unique digitally-controlled de-esser.

With Lundahl transformers on both the input and output, the A1 delivers enough gain to handle any recording situation, with low noise, low distortion, and beautifully wide frequency bandwidth. Use it with any quality rack in the API 500-series format.

weiss-product-a1-isolated-front-opt
Pro Audio

Main Features

Weiss A1

PRISTINE PREAMP

The A1 microphone pre-amplifier stage uses a discrete, class A design with a current-feedback amplifier architecture. The preamp is transformer balanced both on the input and on the output.

Use it with any type of microphone and get up to 60 dB of clean gain with low distortion and wide bandwidth.

UNIQUE DE-ESSER

The unique de-esser in the A1 delivers smooth and natural sibilance reduction. It allows you to capture polished voice recordings right at the source, whether you are recording singing or speech.

The de-esser is very easy to set. It is digitally controlled and uses a multiplying D/A converter running at 500 kHz sample rate as the variable gain element. This reduces noise compared to other solutions and enables precision control of the de-esser.

Additional features

The preamp has a -24 dB pad for line-level sources. It also has a low-cut filter which can be set to 40 or 80 Hz. The 48V phantom power is clean, precise, and stable.

The de-esser can also be used on line-level sources, to for example reduce sibilance on an existing recording. Two A1 modules can be side-chain linked for stereo operation of the de-esser.

weiss-product-a1-isolated-front-opt
Click image to change front/rear view
Pro Audio

Technical Data

Weiss A1

Analog Input
  • One analog input on an XLR connector.
  • Input gain range, pad off: +15 dB to +60 dB, 3 dB steps.
  • Pad attenuation: 24 dB.
  • Maximum input level at minimum input gain, pad on: +29.7 dBu (for THD+N ≤ −80 dB).
  • Input impedance at 1 kHz, pad off: 8.4 kΩ.
  • Input impedance at 1 kHz, pad on: 2.8 kΩ.
Analog Outputs
  • One analog output on an XLR connector.
  • Output gain range: −∞ dB to +12 dB, continuous.
  • Maximum output level, 100 kΩ load: +27.0 dBu (for THD+N ≤ −80 dB).
  • Output impedance at 1 kHz: 290 Ω.
Power
  • Compatible with API Series 500 power racks.
  • Current consumption ±16 V supply: ≤ 150 mA.
  • Current consumption +48 V supply: ≤ 15 mA.
Dimensions

Standard single slot dimensions to fit API’s 500-series rack power units.


Depth: 15 cm / 5.9 inches
Width: 3.8 cm / 1.5 inches (one slot)
Height: 13.3 cm / 5.2 inches

Note: For more detailed product specifications, please refer to the user manual.

Manuals & Downloads

Press Reviews

What the media say

A1 - Resolution Magazine
Resolution Magazine

Audio Production Magazine

A1

The A1 is a very accomplished performer. It more than holds its own against pretty much anything in the 500-series sector. Its secret weapon is the de-esser.

John Thornton
Download Review
Sound on Sound logo
Sound On Sound

Audio Production Magazine

A1

A superbly well-engineered and exceptionally well-performing 500-series mic preamp with an unusual integrated de‑esser combining digital control of an all-analogue signal path. Expensive, but very impressive.

Hugh Robjohns
Visit Website

Weiss Artists

What the USERS say

Dom Torche - A1
Dom Torche

Studio Relief

From classical music to jazz stereo recording, to pop vocal or guitar or whatever you want to record — these preamps are just AMAZING! No noise, great sound and the de-esser it is just world-class.

Product Downloads

For your A1

A1 High Resolution Photos
  • N/A
  • zip
  • 6.6 MB
A1 Manual
  • 1
  • pdf
  • 1.7 MB