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The Aeris is the product of a close collaboration between Jeff Rowland Design Group and Holm Acoustics, a Danish company founded by Thomas Holm that specializes in signal processing products for high end audio applications.

The Aeris is much more than the successful result of a synergistic collaboration between the two companies. The high degree of complementary synergy between the two teams working in parallel can only be defined as a case of true organic design.
Technology
  • IsoSync ECS: Isolated Synchronous Error Correction System. Based upon an asynchronous buffer, voltage controlled crystal oscillators, and a 24 bit D/A converter – all under the precise control of an FPGA (Field Programmable Gate Array) running proprietary algorithms.
  • Bit Perfect and Virtually Jitter Free: Bit perfect conversion with total jitter output noise of less than 10 picoseconds RMS from any input – USB, TOSLINK, and SPDIF.
  • Multi-Stage Isolated Power Supply: Main power supply is isolated inside an external machined aluminum chassis. Eleven precision high-speed regulators provide low impedance and low noise “point of load” DC current to all analogue and digital circuits.
  • Isolated Audio and Digital Circuitry: Left and right channel audio output circuits, digital processing, and D/A conversion circuits are isolated within individual milled aluminum pockets resulting in exceptional EMI shielding, and thermal stabilization.
  • Volume Control: Wide range level control of outputs permit direct connection to power amplifiers.
  • Driver-Free Operation: The USB interface requires no additional drivers to install or maintain/update.
  • Cross-Platform: The USB interface is plug-n-play with all operating systems, including PC, Mac, or Linux.
  • Machined Aluminum Chassis: Precision-machined chassis milled from a solid block of aircraft grade 6061-T6 aluminum, provides exceptional thermal stability, RFI/EMI shielding, and resonance control.
  • 6-Layer Circuit Board: Multi-layer circuit boards provide extremely low impedance ground and power distribution for remarkably low digital noise contamination.
  • High-Precision Surface Mounted Components: Extensive use of Lead (Pb)-free, low temperature coefficient, active and passive surface-mount components results in significantly smaller loop areas, reduced circuit capacitance and inductance, and introduces less noise than conventional leaded components.
  • Transformer Coupled Outputs: Transformer balanced XLR line outputs provide outstanding output common-mode noise rejection, eliminate potential ground loops, and ensure compatibility with other equipment.
  • Output Connections: Rhodium / Teflon Cardas output connectors for both balanced and unbalanced outputs preserve maximum audio signal integrity.
  • Remote Control: Allows remote control of volume, mute, standby, and input selection.
 
Specifications
Inputs1x USB — accepts up to 24 bit PCM at 44.1, 48, 88.2, and 96 kHz sample rates
1x Toslink — accepts up to 24 bit PCM from 11 – 192 kHz sample rates
2x SPDIF — accepts up to 24 bit PCM from 11 – 192 kHz sample rates
Outputs1 pair balanced XLR and 1 pair unbalanced RCA; 7 volts RMS max output level
Volume ControlDual-stage attenuation; 70 dB range, plus 20 dB overdrive
Software/DriversNo special drivers necessary; USB interface is plug-n-play with all operating systems, including PC, Mac, or Linux.
Clocks20 bit dynamic range Voltage Controlled Crystal Oscillators (VCXO); 44.1 kHz and 48 kHz < 1 picosecond RMS jitter
D/A ConverterDifferential output; 352.8 kHz, 24 bit
Digital FilterFinite Impulse Response (FIR) symetrical; Flat phase and group delay
THD+NAnalogue outputs: < 0.0006%
Output ImpedanceRCA / XLR: 120 ohms
DAC and Power Supply Weight24.4 lb / 11kg
Dimensions2.4″ x 15.5″ x 11.6″; 61mm x 394mm x 294mm
 
Reviews