Traditional DAC designs use brick-wall digital filters, usually followed by more analog filtering to reduce sampling noise, but cause signal degradation in the process. Another approach has been to use no filtering at all, but this adds noise to the analog signal. Both of these designs have their strengths and weaknesses, but neither tends to be a good trade-off. This dac uses only a mild “slow roll-off” digital filter and first order analog filter to tame the sampling noise. This architecture has reduced filtering artifacts compared to brick-wall types, and lower sampling noise than filterless types, resulting in a more “analog” sound.
Digital input signals are accepted by Toslink optical or coaxial SPDIF, then fed to the CS8416 24 bit/192k low jitter input receiver, then to the Burr Brown PCM1794 balanced/current output DAC. Our unique output stage is a fully discrete/zero feedback design and uses only a single transistor per output to insure the purity of the audio signal. Circuit board is high quality 2 oz. copper with lead-free silver solder construction.
Input selection and digital domain phase are selected by convenient front panel switches, and an LED indicates “LOCK” when a valid signal is being received.
Toslink Optical, Coaxial SPDIF
44.1k-192k (Coaxial), 44.1k-96k (Toslink)
20Hz-20kHz +/- 0.1db
2.25vRMS (Single-ended), 4.5vRMS (Balanced)
Rotel’s new digital-to-analog converter envelops the listener in the most accurate audio reproduction possible from any digital source, whether it be legacy PCM sources or the latest digital file formats.
At its heart, the RDD-1580 makes use of Wolfson’s WM8740 stereo digital-to-analog converter. The RDD-1580 uses two WM8740s in a complementary configuration, which reduces noise and distortion well beyond that a single converter can provide.
Another RDD-1580 advantage lies in its input flexibility. A front panel USB input supports Apple iPod®, iPhone® and iPad® as well as streaming via Bluetooth with the included adapter. The rear panel PC-USB input supports audio up to 24-bit/192kHz in asynchronous mode. Two sets of rear panel RCA-style coaxial and optical digital inputs are optimized for LPCM data streams. This includes CDs 16-bit/44.1kHz standard up to high definition sources with 24-bit/192kHz audio data.
A Rotel-designed and manufactured toroidal transformer sits at the foundation of the RDD-1580’s well-regulated power supply. Advanced custom-designed slit-foil capacitors provide electrical storage capabilities to ensure substantial and stable operating voltages and current to feed the critical circuit stages.
The RDD-1580 provides both single-ended and balanced outputs with RCA and XLR connectors respectively. Recognizing today’s changing tastes in audio sources, the RDD-1580 even provides high-current charging capability (2.1 amperes) for an iPad® or similar device to reduce clutter and increase needed desk space while expanding your audio source options.
Built for stunning sound quality, but designed for today’s ever-increasing digital world, the RDD-1580 offers a first rate combination of superior sonics and convenience.
DIMENSIONS (W × H × D) 17″ × 2.13″ × 12.5″
POWER REQUIREMENTS 120V, 60Hz
POWER CONSUMPTION 25W
STANDBY POWER CONSUMPTION 0.5W
NET WEIGHT 5.1kg (11lbs.)
TOTAL HARMONIC DISTORTION (THD)(20Hz–20kHz) <0.004%
FREQUENCY RESPONSE 10Hz – 95kHz ±3dB
S/N RATIO (IHF “A” Weighted)128dB
DECODABLE FRONT USB
FORMATSMP3, WAV, WMA, Ogg Vorbis(up to 48kHz 16-bit)
COAX/OPTICAL DIGITAL INPUT SIGNALS LPCM (Up to 24-bit/192kHz)
PC-USBUSB Audio Class 1 (up to 24/96)
USB Audio Class 2 (up to 24/192)
The MX DAC has inputs for: 2 x coax (up to 24bit 192 kHz PCM), 2 x optical (up to 24bit 192kHz PCM) and asynchronous USB up to 24bit 192 kHz PCM as well as DSD 64 and DSD 128.
Also, all inputs whether from coax, optical or USB, are processed in the DSD domain. This desirable feature gives a warmth and humanity to the sound that simple digital conversion doesn’t achieve.
The MX DAC has both single ended and balanced outputs.
MX-DAC – Specifications
Sample rate converter: SRC4392 up-sampling data to 192kHz
Digital to Analogue converter: PCM1795 32 bit / 192kHz Multi-bit Sigma-Delta type
Output Voltage: 2 Volts RMS single-ended (RCA)
Output Voltage: 4 Volts RMS balanced (XLR)
PCM THD: <0.002%
PCM THD (+ noise): <0.003%
DSD THD: <0.003%
DSD THD (+ noise): <0.006%
PCM Frequency Response: –3dB, 2Hz to 90kHz
PCM Frequency Response: –3dB, 2Hz to 40kHz
Channel Separation: -110dB
Coaxial Inputs: S/PDIF up to 24 bit / 192kHz
Optical Inputs: S/PDIF up to 24 bit / 192kHz
2x RCA coaxial connector SPDIF 32-192 kbps
(16-24 bit stereo PCM)
2x TOSLINK optical connector 32-192 kbps
(16-24 bit stereo PCM)
1x USB type ‘B’ connector
Asynchronous data stream at up to 24-bit/192kHz PCM as well as DSD64 and DSD128
(Determined by source file/computer settings)
1x line level RCA (single-ended)
1x XLR Male sockets (balanced) to EIA RS-297-A
Dimensions – WxHxD (mm): 220 x 53 x 215
Weight (unpacked / packed): 1.9Kg / 2.4Kg
Power Consumption: <0.25 Watts standby, <1 Watt max.
1x 5v / 2A DC power supply (90-250VAC universal worldwide supply)
Windows driver CD
V90-DAC – Specifications
Jitter: <12 picoseconds peak to peak
THD(+ noise): <0.004% 20Hz to 20 kHz
Frequency Response: +0, –0.1dB, 20Hz to 20 kHz
Crosstalk: -104dB, 20Hz to 20 kHz
Signal / Noise ratio: -117dB, 20Hz to 20 kHz
1x RCA coaxial connector SPDIF 32-192 kbps (16-24 bit stereo PCM)
2x TOSLINK optical connector 32-96 kbps (16-24 bit stereo PCM)
1x USB type ‘B’ connector – Asynchronous data stream at up to 24-bit/96kHz (Determined by source file/computer settings)
1x line level RCA (phono)
Dimensions – WxHxD (mm): 170 x 47 x 102
Weight (unpacked / packed): 600g / 1.1 kg
1x 12v 500mA DC power supply