Quantec Yardstick Room Simulators

Accurate and artefact-free simulation of real acoustic spaces

Quantec Yardstick Room Simulators 2017-02-22T15:44:26+00:00

Project Description

Quantec Yardstick Room Simulators

Based on the highly-respected QRS algorithm first developed in 1982, the new Quantec Yardstick Room Simulators are able to create the most accurate and natural-sounding simulation of real acoustic spaces yet achieved. Invaluable for post-production and ADR atmos-matching, they can also be used to synthesise stereo or multi-channel sound fields from mono sources, or for high-quality audio recording of acoustic instruments.

  • Super-realistic room simulation based on renowned QRS algorithm
  • Audibly superior to artificial reverb units
  • Reverberation field is natural, highly transparent, uncoloured and artefact-free
  • Minimal controls – very simple to operate
  • Internal library of “common spaces” greatly speeds up ADR/post process
  • Simulation by virtual chamber containing virtual loudspeakers and microphones
  • Room size adjustable from 1 to 1,000,000 m3
  • RT60 adjustable from 10 ms to 100 s
  • Up to 192 kHz/24bit internal processing
  • < 1ms latency
  • Bargraph metering of all inputs and outputs
  • AES3 I/O versions available for stereo and multichannel applications
  • Stereo analogue I/O version also available
  • Remote control via MIDI, USB, RS-232 or Ethernet using web browser
  • 1U rackmounting unit, only 36 mm deep, very low power consumption

Models available:

  • Yardstick 2492 – 2-in/2-out, AES3 I/O
  • Yardstick 2493 – 2-in/2-out, analogue I/O
  • Yardstick 2496 – 2-in/6-out, AES3 I/O
  • Yardstick 2498 – 8-in/8-out, AES3 I/O


Quantec Room Simulators have never been ‘just another reverb unit’; in fact, ‘reverb unit’ is a term the designers abhor. The QRS algorithm, developed continuously since its first implementation in 1982, is based on careful analysis of the behaviour of the air in a real acoustic space, rather than concentrating on the generation of artificial reflections. The Yardsticks represent the new generation of Quantec Room Simulation, and contain 15 times the DSP power of the previous versions. A virtual room – or exterior space – modelled by the Quantec algorithm sounds exactly like the real thing, regardless of the programme material – vocal, instrumental or dialogue.

In film and TV post-production, convincingly matching dialogue to picture is what ADR is all about. With normal reverb units – even industry-leading devices – this can be time-consuming, involving tweaking the many individual parameters available to try to match the visual environment. The Yardstick minimises this process; the space simulations are so accurate, little or no adjustment is required.

As well as realistic simulation of large spaces such as halls of various sizes and acoustic characters, the Yardstick also specialises in modelling much smaller and unusual spaces. The internal Dialog Library includes a range of interior “domestic” spaces such as bathrooms, garages and cupboards, vehicle interiors, car parks, shopping malls, alleyways, tents, tunnels, and so on. “Natural” spaces catered for include caves and various open-air environments.

The QRS algorithm is based on the concept of a “virtual room” containing “virtual speakers” and “virtual microphones”, the “position” of which is optimized automatically when adjusting the room model’s parameters. Models 2492 and 2493 are two-channel units whose virtual rooms contain two speakers and two microphones. Models 2496 and 2498 have multiple microphones, and this permits a stunningly realistic surround sound “upmix” to be created from a stereo programme. Model 2498 has been developed for use with audio already in multi-channel formats of up to 7.1, and the room model includes eight virtual speakers and eight virtual microphones.

The virtual room design philosophy readily lends itself to multi-channel synthesis. A mono input signal can easily generate a stereo signal with excellent image depth, and the same principle allows a stereo signal to generate a multi-channel (e.g., 5.1) sound field (on certain models). When used as a primary reverb unit for high-quality music recording, the results are of such accuracy that highly experienced classical musicians are unable to distinguish between recordings of a performance in a real space and an anechoic recording processed by the QRS algorithm.

The Yardsticks may be remotely controlled using MIDI, RS-232 or Ethernet connectivity. The Ethernet interface is particularly powerful and elegant, as it uses the Yardstick’s internal web pages for control; it is only necessary to enter an IP address into the web browser of any connected computer to gain access to the full range of unit parameters. Ethernet is also used to rapidly update unit firmware. Further, using a Yardstick with a DAW equipped with MIDI tracks (e.g., ProTools, SADiE, CuBase, etc.) effectively provides total dynamic automation and recall of all QRS settings and parameters.

Audio professionals are usually surprised at the tiny physical size of the Yardstick; at 1U high and only 36 mm depth it is unobtrusive in situations where rack space is at a premium. The Yardstick includes a Universal PSU (85 to 265 VAC) and consumes 20 W or less (model-dependent).


Quantec Yardstick 2498 Brochure – PDF
Quantec Yardstick 2496 Brochure – PDF
Quantec Yardstick 2492 Brochure – PDF


Quantec Yardstick Manual – PDF

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