Differential Reference® Design Series Stack

CONNECTIVITY

Stereo Mode:
Unbalanced line level inputs (RCA): one per channel.
Balanced line level inputs (XLR): one per channel.

Audiophile grade five-way speaker binding posts: one pair per channel.

Bridged Mono Mode:
Unbalanced line level inputs (RCA): one.
Balanced line level inputs (XLR): one.
Audiophile grade five-way speaker binding posts: one pair.

Trigger Input and Trigger Output (nominal 12V; 3.5mm connector): one each.

ANALOG AUDIO SPECIFICATIONS

Power Output (Stereo Mode; one channel driven):
100 Watts RMS; 20 Hz - 20 kHz; THD < 0.02% into 8 Ohms
175 Watts RMS; 20 Hz - 20 kHz; THD < 0.05% into 4 Ohms

Power Output (Stereo Mode; two channels driven):
90 Watts RMS/channel; 20 Hz - 20 kHz; THD < 0.02% into 8 Ohms
130 Watts RMS/channel; 20 Hz - 20 kHz; THD < 0.05% into 4 Ohms

Power Output (Mono Bridged Mode; one channel):
365 Watts RMS; 20 Hz - 20 kHz; THD < 0.1% into 8 Ohms
400 Watts RMS; 20 Hz - 20 kHz; THD < 0.1% into 4 Ohms

Power Bandwidth (at rated power; 8 Ohms): 20 Hz to 20 kHz +/- 0.7 dB .

Broadband Frequency Response: 5 Hz to greater than 80 kHz +0 dB/-5 dB .

THD+N (1 kHz; 100 watts; 8 Ohms): < 0.008% .

Signal to Noise Ratio (ref rated output; 8 Ohms): > 115 dB .

Signal to Noise Ratio (ref 1 watt output; 8 Ohms): > 94 dB .

ENVIRONMENTAL

Power Requirements:

Operating Line Voltage: 90 - 250 VAC; 50/60 Hz.

Low Power Standby Consumption: Meets latest international standby low-power requirements.

Power Supply: Internal (detachable IEC power cord; no wall wart).

Weight (unboxed): 5 pounds.

Dimensions: 10-1/2 “W x 10-1/4”D x 2-1/4”H (unboxed; including feet)

CIRCUIT HIGHLIGHTS

Digital to Analog Conversion: ESS ES9038Q2M SABRE32 Reference DAC.

(32 bit Stereo DAC with Hyperstream® II DAC architecture and Time Domain Jitter Eliminator).

Analog Signal Path Active Electronics: MC33078 and OPA1656

(high-speed, low-distortion, audio operational amplifiers).

TOPOLOGY

The DRS-1 is a high performance two channel audio streamer based on the popular Volumio Premium operating system. The DRS-1 can play content from a variety of streaming services, from locally connected USB storage devices, and from network-attacked storgare devices.

The DRS-1 includes both a variety of digital audio outputs, and both balanced and unbalanced analog audio outputs, powered by an internal high-performance DAC that uses the ESS ES9038Q2M SABRE32 Reference DAC chip. An HDMI video output is included, which displays the console screen of the unit, and can be used to display track information, album cover art, and other content information.

CONNECTIVITY

Balanced analog outputs (XLR); variable level controlled by Volumio software: 1 pair.

Unbalanced analog outputs (RCA); variable level controlled by Volumio software: 1 pair.

Digital audio outputs, optical S/PDIF (Toslink); fixed level: 1.

Digital audio outputs, electrical S/PDIF (Coax); fixed level: 1.

Network connection, wired Ethernet: 1.

Network connection, WiFi: 1.

USB ports: 2 (can be used to connect USB audio storage devices or mouse / keyboard).

HDMI output, video: 1 (displays configuration, track info, or Manifest UI on TV or monitor).

Trigger Input / Output: 1 each.

RATED OUTPUT

Balanced (XLR; at 0 dB in): 4.2 VRMS .

Unbalanced (RCA; at 0 dB in): 2.1 VRMS.

FREQUENCY RESPONSE & DISTORTION (ANALOG OUTPUTS)

Frequency Response: 20 Hz to 20 kHz +/-0.2 dB (44.1k and above sample rates).

Broadband Frequency Response: 5 Hz to 80 kHz +0/-2 dB

Signal to Noise (S/N Ratio): > 116 dB.

THD+N (ref 0 dB): < 0.01%.

THD+N (ref -6 dB): < 0.002%.

DIMENSIONS

Weight (unboxed): 5 pounds.

10-1/2 “W x 10-1/4”D x 2-1/4”H (unboxed; including feet)

CIRCUIT HIGHLIGHTS

Digital to Analog Conversion: ESS ES9038Q2M SABRE32 Reference DAC

(32 bit Stereo DAC with Hyperstream® II DAC architecture and Time Domain Jitter Eliminator).

Analog Signal Path Active Electronics: OPA1656 and OPA1678

(ultra-low-noise, low-distortion, audio operational amplifiers).

USB Interface: Comtrue CT7601 32 bit 768 kHz USB Audio Bridge

(supports PCM up to 32/768k; DoP up to DoP256; native-DSD up to DSD512).

TOPOLOGY

The DRD-1 is a high performance two channel PCM audio DAC, with a variety of digital inputs, including a very high performance USB input, and an HDMI-ARC digital audio input. The USB digital audio input supports sample rates up to 768k, DoP up to DoP256, and Native DSD up to DSD512 with appropriate drivers. The DRD-1 features a fully balanced differential analog signal path, both balanced (XLR) and unbalanced (RCA) outputs, and a fixed output level, for superb audio performance with a wide variety of preamps.

RATED OUTPUT

Balanced (XLR; at 0 dB in): 4.2 VRMS .

Unbalanced (RCA; at 0 dB in): 2.1 VRMS.

Frequency Response and Distortion

Frequency Response: 20 Hz to 20 kHz +/-0.2 dB (44.1k and above sample rates).

Broadband Frequency Response: 5 Hz to 80 kHz +0/-3 dB

Signal to Noise (S/N Ratio): > 120 dB.

Crosstalk: < 100 dB.

THD: < 0.0008%.

IMD: < 0.0025%.

Note: The frequency response with digital input signals at lower sample rates is determined by the sample rate of the incoming digital signal.

AUDIO FORMATS AND BIT RATES SUPPORTED

•Stereo PCM digital audio via USB at all standard sample rates and bit depths up to 32/768k (no drivers required for Windows, Apple, and most Linux computers).

• Stereo DoP (DSD-over-PCM-over-USB) via USB at DoP64, DoP128, and DoP256 (ASIO driver or support required).

• Native DSD via USB at DSD64, DSD128, DSD256, and DSD512 (ASIO driver and additional software support required).

• Stereo digital audio via S/PDIF (optical and electrical) at all standard sample rates and bit depths up to 24/192k.

• Stereo digital audio via HDMI-ARC (sample rates and bit depths determined by source).

CONNECTIVITY (INPUTS)

Coax electrical S/PDIF digital audio input (1)

Toslink optical S/PDIF digital audio input (1)

HDMI-ARC digital audio input (1)

High performance USB digital audio input (1; USB-C).

CONNECTIVITY (OUTPUTS)

Main Outputs (balanced, XLR), fixed level (1 stereo pair).

Main Outputs (unbalanced, RCA), fixed level (1 stereo pair).

TRIGGER

Trigger Input; Trigger Output (output +12V DC; input 5-12 V AC/DC).

FRONT PANEL DISPLAY

High visibility blue OLED (fully dimmable).

REMOTE CONTROL

All metal; full function; included.

Note: The DRD-1 Differential Reference DAC and DRP-1 Differential Reference Preamp use the same remote control - so the same remote control can be used to control both.

ENVIRONMENTAL

Power Requirements: 90 - 250 VAC; 50/60 Hz.

Low Power Standby Consumption: Meets latest international standby low-power requirements.

Power Supply: Internal (detachable IEC power cord; no wall wart).

DIMENSIONS

Weight (unboxed): 5 pounds.

Dimensions: 10-1/2 “W x 10-1/4”D x 2-1/4”H (unboxed; including feet)

CONNECTIVITY (INPUTS)

Stereo unbalanced line level inputs (RCA): two pairs.

Stereo unbalanced PHONO input (MM or MC): one pair.

Stereo balanced line level inputs (XLR): one pair.

CONNECTIVITY (OUTPUTS)

Stereo unbalanced line level outputs (RCA): one pair.

Stereo balanced line level outputs (XLR): one pair.

Summed balanced subwoofer output (XLR): one.

ANALOG AUDIO SPECIFICATIONS

Frequency Response (line level): 20 Hz to 20 kHz +/- 0.05 dB .

Frequency Response (phono; ref RIAA): 20 Hz to 20 kHz +/- 0.2 dB .

Broadband Frequency Response: 10 Hz to greater than 80 kHz +0 dB/-3 dB .

Signal to Noise Ratio (ref rated output; line level): > 118 dB .

Gain (phono; Moving Magnet cartridge: > 40 dB .

Signal to Noise Ratio (phono; ref 6 mV; Moving Magnet cartridge: > 83 dB .

Gain (phono; Moving Coil cartridge): > 60 dB .

Signal to Noise Ratio (phono; ref 2 mV; Moving Coil cartridge): > 73 dB .

THD+N (20 Hz to 20 kHz): <0.000715% .

Crosstalk: < 90 dB .

Rated Output Voltage (unbalanced outputs): 2 VRMS .

Rated Output Voltage (balanced outputs): 4 VRMS .

Maximum Output Voltage: 9 VRMS .

Input Voltage Overload: 4 VRMS .

Bass Management (switchable Low-Pass filter): 80 Hz; 12 dB/octave; fixed frequency.

Bass Management (switchable High-Pass filter): 80 Hz; 12 dB/octave; fixed frequency.

TRIGGER

Trigger Input; Trigger Output (output +12V DC; input 5-12 V AC/DC).

FRONT PANEL DISPLAY

High visibility blue OLED (fully dimmable).

REMOTE CONTROL

All metal; full function; included.

Note: The DRD-1 Differential Reference DAC and DRP-1 Differential Reference Preamp use the same remote control - so the same remote control can be used to control both.

ENVIRONMENTAL

Power Requirements: 90 - 250 VAC; 50/60 Hz.

Low Power Standby Consumption: Meets latest international standby low-power requirements.

Power Supply: Internal (detachable IEC power cord; no wall wart).

DIMENSIONS

Weight (unboxed): 5 pounds.

10-1/2 “W x 10-1/4”D x 2-1/4”H (unboxed; including feet)