WLM Gamma Reference D/A Converter
The highest fashion item in digital audio at the moment seems to be the Digital Analog Converter (DAC). With more and more hitting the market each day it is easy to get lost amongst the never ending talk about what is best.
We will let you in on a little secret; there is no best. There is the best for a particular system but there is no outstanding best for every application. If you want the best for your WLM system then this is it. The WLM Gamma Reference is based on the prestigious Minerva DAC from Weiss Engineering. WLM have chosen to use a high quality Trafomatic power supply to get the absolute best from this configuration.
Capable of handling up to 24bit / 192kHZ through a Firewire connection the WLM Gamma Reference is the final piece of the puzzle for many WLM customers.
The WLM Gamma Reference has the following inputs:
- 2 x Firewire
- 1 x SPDIF Coax
- 1 x SPDIF Optical
- 1 x AES/EBU
- 1 x RCA Analog
- 1 x XLR Analog
- 1 x AES/EBU Digital Out
- 1 x SPDIF Coax Digital Out
The following conversions are possible:
- Firewire to analogue
- AES/EBU (SPDIF) to analogue
- Firewire to AES/EBU
- AES/EBU to Firewire
Jitter suppression: Several signal re-clocking schemes are combined for extremely high jitter attenuation, making the GAMMA Reference virtually immune to jitter over a very wide bandwidth.
Converters: Eight times oversampling sigma delta D/A converters are used.
Software: Drivers for Windows and OSX operating systems.
Power Supply: A generously dimensioned non-switching type Power Supply is used. All sensitive voltages have their own local regulators. The standby Power Supply leaves the Firewire chip powered, allowing to switch on the GAMMA Reference via the Firewire link. The Firewire bus power is not used by the GAMMA Reference. This allows the GAMMA Reference to be connected with computers that do not supply bus power.
The mains voltages can be set to 100 – 120VAC or 200 – 240VAC.
- Sampling frequencies: 44.1, 48, 88.2, 96, 176.4 and 192kHz
- Maximum input wordlength: 24 Bits
- Output levels (selectable by rotary switch) in analogue domain:
- +17dBu (5.48Vrms) with a 0dBFS sinewave input
- +11dBu (2.74Vrms) with a 0dBFS sinewave input
- +7.2dBu (1.78Vrms) with a 0dBFS sinewave input
- +4.8dBu (1.35Vrms) with a 0dBFS sinewave input
- Mains Voltage: 100 – 120VAC / 200 – 240VAC
- Fuse rating: 500mA slow blow (100 – 120VAC), 250mA slow blow (200 – 240VAC)
- Max. Power consumption: 7VA
- Max. Power consumption in standby: 3VA
The measurements below have been taken at the following conditions (unless noted otherwise): 1kHz measurement frequency, +17.0dBu (equals 0dBr) output level, 48.0kHz sampling frequency (fs), 22kHz measurement bandwith.
- Frequency Response: 0Hz – 20kHz +/- 0.3dB
- Total Harmonic Distortion plus Noise (THD+N): < -100dBr (0.001%) @ -3dBFS input level
- Linearity : @ 0 to -120dBFS input level : less than +/- 1dB deviation from ideal
- Noise floor @ -20dBFS input: < -110dBr unweighted
- Crosstalk: < -110dB, 0 – 20kHz
- Interchannel Phase Response: < +/- 0.5°, 10Hz – 20kHz
This is our own personal reference for all digital conversions. So far we have found nothing that can beat it within our WLM system.