Wadia Digital 121 Decoding Computer


Good condition. No box.

Product Description

The 121 was designed for use in a computer-audio system where it functions as a digital preamp, DAC, and headphone amp. The 121 has multiple digital inputs for AES/EBU, S/PDIF (both coaxial and BNC), TosLink, and USB 2.0. It includes two sets of analog outputs—one set of single-ended RCA and one set of balanced XLR. The 121 also has a ¼” stereo headphone output with its own separate amplifier and power supply on the front panel.
The Wadia 121 is a completely digital device with no analog inputs. It uses a 32-bit digital volume control, so all attenuation is also done in the digital domain. Every digital volume control will truncate bit-length (and musical data) if it is used at its very lowest settings. To reduce this effect the Wadia’s maximum output level can be adjusted from 4.0V down to 2.0V or even 1.0V, so that at normal listening levels the volume control can be set near its maximum level.
The Wadia 121 supports up to 192/24 PCM files via its AES/EBU, S/PDIF, and USB inputs. For Mac users the USB input is plug and play, but for PC owners a new driver must be installed to support USB 2.0 capabilities. Whether Windows 8 will support USB 2.0 via built-in drivers is yet to be seen. On a Mac, if you open up the MIDI control panel you will see the Wadia 121 listed as “Wadia USB Audio 2.0.” Under “Clock Source” the control panel reads “Wadia Internal Clock.” This last bit of info corroborates the presence of Wadia’s internal asynchronous USB clocking. Combined with its proprietary “DigiMaster algorithm and filtering technology” Wadia claims “jitter-free playback” from all digital music sources.


Type: DAC and headphone amplifier
Digital inputs: AES /EBU (XLR), coaxial (RCA and BNC), TosLink optical, USB B
Input data rates: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz (up to 24 bits)
Analog outputs: One pair balanced (XLR), one pair unbalanced (RCA)
Dimensions: 2.7″ x 8″ x 8″

Return & Refund Policy

• All Pre-Owned items have been tested before listing.
• We encourage buyers to test and verify the equipment condition at our showroom (1 Coleman Street, The Adelphi, Unit 03-35) — pre-owned condition as shown on our listed page.