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PS Audio Digital Link III by Gary Galo, Regular Contributor

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PS Audio Digital Link III by Gary Galo, Regular Contributor Tube, Solid State, Loudspeaker Technology Article prepared for www.audioXpress.com PS Audio Digital Link III By Gary Galo, Regular Contributor PS Audio International 4826 Sterling Drive Boulder, CO 80301 (720) 406-8946 www.psaudio.com List Price: $699 PHOTO 1: Front view of the PS Audio Digital Link III. Operation is very simple, with two buttons toggling input selection and upsampling frequency. S Audio introduced their first outboard digital-to-analog con- CIRCUIT DETAILS Sample rate conversion is accom- verter, the original Digital Link, The Digital Link III incorporates state- plished with the Burr-Brown/TI Pnot long after the first CD play- of-the-art digital hardware (Photo 3). SRC4192, possibly the finest asyn- ers appeared. Like many of us with good The input receiver is a Cirrus Logic chronous sample rate converter chip ears, PS Audio found the first CD play- CS8416, a 192kHz/24-bit device with currently available. The SRC4192 will ers appalling, and put much of the blame low-jitter clock recovery. The CS8416 upsample any incoming data stream on the poor quality of the D/A convert- supports eight digital inputs, eliminat- to as high as 192kHz, with distortion ers used in those early players. The Digi- ing the need for input switching ahead levels of -140dB from 20Hz up to half tal Link, and its successor the Ultralink, of the input receiver. I wish that PS the sampling frequency. Like all asyn- showed many music lovers the potential Audio had included one or two more chronous sample rate converters, the of CD reproduction in a way that stand- digital inputs on the Digital Link III, SRC4192 attenuates clock jitter, and alone players simply could not. because many of us have more than two its jitter performance will ultimately be The Digital Link III is PS Audio’s digital sources. determined by the stability of the refer- latest outboard DAC, and is a very simple device to connect and operate (Photos 1 and 2). Three digital inputs are included: S/PDIF coax via an RCA connector, Toslink optical, as well as a USB input for connection to a com- puter. The Digital Link III upsamples all incoming data to either 96kHz or 192kHz, user selectable. LEDs are used to indicate the selected input, the up- sampling frequency, and a digital lock. PS Audio uses audiophile-grade, gold- plated, Teflon-insulated RCA connec- PHOTO 2: Rear view of the Digital Link III. The DAC has three digital inputs: S/PDIF coax, tors, and Neutrik XLR connectors with Toslink optical, and a USB interface for computer connection. gold-plated contacts. audioXpress 2009 1 the photo on the manufacturer’s web- site, however. All rectifier diodes are Vishay/Gen- eral UF5404 high-speed, soft-recovery types—four for the analog supplies and two for the digital. Raw filtering is done with four 12,000µF/35V elec- trolytic capacitors. Regulators include a 7815/7915 pair for the analog supplies, along with a 7805CT and 78M33C for the digital supplies. Two LM317 regu- lators, near the output stage in each channel, probably provide local regula- tion, or regulation for the DC servo. PS Audio recommends isolating the Digital Link III from mechanical vi- bration. There are many types of isola- tion feet on the market, some of them fetching extremely high prices. Back in the late 1980s AudioQuest brought PHOTO 3: Inside view. The Digital Link III uses state-of-the-art digital hardware, a ro- bust power supply, and discrete, zero-feedback analog circuitry. Sorbothane isolation feet to the audio- phile market. I still use a set from that vintage, and they continue to work ex- ence clock. PS Audio claims 50pS of The PCM1798 has true differential tremely well. AudioQuest subsequently clock jitter after they recover the clock current outputs for each channel. PS replaced the Sorbothane isolators with “later in the process,” which presumably Audio doesn’t like IC op amps, noting a material they call SorboGel. These means in the sample rate converter. that “feedback and speed issues” ac- and several other isolation components The SRC4192 has a bypass mode, count for the bright and edgy sound are available from The Audio Advi- which routes the input port directly to found in op amp based current-to- sor—www.audioadvisor.com (they also the output, bypassing the sample rate voltage (I/V) converters. PS Audio sell the Digital Link III). conversion. PS Audio has not imple- believes that slewing-induced distor- Perhaps the “best buy” in audio mented the bypass feature. However, all tion (SID) is a problem even with isolators are the Sorbothane Bum- digital inputs are upsampled to either exotic high-speed op amps used for per Hemisphere Mounts sold by Ed- 96kHz or 192kHz, as selected on the I/V conversion. Their approach con- mund Optics—www.edmundoptics. front panel. Interestingly, the SRC4192 sists of a single-transistor I/V con- com, part no. NT35-264 (Photo 4). is pin-compatible with the Analog De- verter with no feedback, which they These bumpers are 50mm in diameter, vices AD1896 used in the Benchmark claim completely eliminates the speed 26mm thick, and cost only $16.50 for DAC1 USB. and SID problems associated with a package of four. Because I’ve found The D/A converter chip is a Burr- op amps. them to be excellent when used with Brown/TI PCM1798, a 192kHz/24- The rest of the analog circuitry re- CD and DVD players, I decided to bit device incorporating an 8× over- flects the same design philosophy. The use them on the Digital Link III as sampling digital filter. The PCM1798 I/V converter feeds a passive analog well. I suggest removing the feet sup- supports Red Book de-emphasis in the filter which PS Audio says “eliminates plied by PS Audio and putting these digital domain, and Chuck Hansen’s the hardness associated with analog in their place. measurements confirm that it has been filtering.” Gain is provided by a fully PS Audio also recommends power implemented in the Digital Link III. discrete Class-A amplifier using FETs line filtering and a high quality power Kudos to PS Audio for enabling the at the input and low-noise high-current cord, and suggests their own in both de-emphasis function, ensuring back- bipolar transistors for the voltage gain cases. They caution against simple wards compatibility for your entire and output stages. The Digital Link III power line filters, noting that they may CD collection, no matter how old. A is DC coupled. There’s a Texas Instru- “bleach” the sound and rob the music Burr-Brown/TI PCM2902 USB codec ments TL082 op amp near each output of its life and dynamics. I found that is used for the USB interfacing, and stage, which is probably used as a DC my own power line filtering scheme the TOSLINK optical receiver is an servo amplifier. worked extremely well with the Digital RX142L. The digital chips chosen for PS Audio has paid careful attention Link III. the Digital Link III are outstanding to the power supply in the Digital Link Regarding power cords, I use a three- performers and are used in many well- III, beginning with a 32VA toroidal conductor 14AWG “SJT” type power regarded professional and audiophile transformer shown in Photo 3. The cord fitted with a Marinco 8215 Hos- products. transformer is not as large as the one in pital Grade plug and their 320IEC15 2 audioXpress 2009 www.audioXpress.com DAC has a power switch on the rear panel, but it can be left on all the time, or connected to a switched power line filter. THE SOUND Readers will recall my review of the Monarchy M24 (aX Oct. 2007, with measurements by Chuck Hansen in June 2007) and the Benchmark DAC1 USB (aX Jan. 2009). Getting right to the point, the sound of the PS Audio Digital Link III is stunning, and is eas- ily the most satisfying of the D/A con- verters I’ve auditioned over the past year and a half. With a price tag of just under $700, it’s a truly amazing achievement. Although the Digital Link III sounds excellent with the upsam- pling set at 96kHz, it is even better at 192kHz. Chuck’s THD measurements show the presence of low-order THD but, unlike the Monarchy M24, the PS Audio’s THD is entirely second harmonic. The sound of the Digital Link III is both rich and warm, with PHOTO 4: Sorbothane Bumper Hemisphere Mounts from Edmund Optical are a cost- palpably realistic instrumental timbres, effective solution to isolation from mechanical vibration. yet the sound is not overly euphonic. Instrumental timbres simply sound more like live music than on any DAC IEC connector (the Digital Link III former coupling using the “audiophile” I’ve heard, including gorgeous repro- has a standard IEC power connector version of the Jensen IsoMax CI-2RR duction of massed orchestral strings on the rear panel). Both are available that I described in aX 1/08 (“Lundahl in the Mercury CD of Respighi’s The from Parts Express (www.partsexpress. and Jensen Meet the Monarchy M42”). Birds. com). I have no complaints about the With this configuration, simply use the The Digital Link III produces a spa- sound of the Digital Link III used with inverting inputs to the isolation trans- cious, airy sonic presentation with ex- my home-brew power cord. formers. cellent inner detail. Superficially, the The Digital Link III has a USB in- Benchmark DAC1 USB has greater ABSOLUTE POLARITY terface for connection to a personal inner detail than any DAC I’ve heard, The Digital Link III inverts absolute computer.
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