PS Audio DirectStream Memory Player

Directstream Memory Player is a universal transport | capable of playing multiple types of optical discs

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PS Audio DirectStream Memory Player

Directstream Memory Player

In 2009, the high-end audio world was shaken with the introduction of the world’s first high resolution memory player, the PerfectWave Transport.

Nearly eight years later PS Audio engineering has taken another giant leap forward with the introduction of the PWT’s replacement, the DirectStream Memory Player, the last transport you’ll ever need.

Directstream Memory Player is a universal transport, capable of playing multiple types of optical discs including, Blu-ray audio, DVD-Audio, AVCHD, SACD, HRx, CD, CD-R/RW, DVD±R/RW, DVD±R DL, BD-R/RE, as well as stored data through its USB digital input.

CD performance of DMP has been enhanced to a degree once thought unobtainable, narrowing the gap between Red Book CD reproduction and high resolution PCM and DSD.

Played through DMP, ordinary CDs take on new life, with improved dimensionality, soundstage width and depth, improved dynamics (both micro and macro), increased low level harmonic information, and richer tonal balance.

Plus, hear SACD for the first time

The protected DSD layer of SACD has long been available only through D/A converters built in to players and a few receivers and surround processors. These internal D/A processors, while adequate, were never capable of playing back stored music at the quality and performance levels enjoyed by mastering engineers.

Now, with the introduction of PS Audio’s revolutionary new memory player, DMP, owners of their DirectStream series of DACs can uncover all that they have been missing.

Based on a proprietary handshake protocol between DMP and PS Audio DACs, through their advanced I²S interface, pure DSD is streamed to, and processed in, the same reference quality DAC used by mastering engineers.

DMP Memory

At the heart of Directstream Memory Player is an advanced version of core PS Audio technology, the Digital Lens.

Invented in 1993 by PS Audio founder Paul McGowan and chief engineer, Bob Stadtherr, the Digital Lens focuses digital data into a perfect stream, unaffected by the transport’s mechanical and electrical properties.

In digital audio, timing is everything. Jitter, noise, and a lack of isolation have major impacts on sound quality, especially affecting lower resolution media such as CD.

DMP’s advanced Digital Lens technology solves timing, noise and isolation problems through a unique combination of buffer memory and FPGA based digital processing.

Up until DMP’s advanced Lens technology was introduced, the internal Digital Lens found in the older PerfectWave Transport, relied on an intelligent RAM buffer to isolate digital data from the mechanical optical drive and laser mechanism.

Separated from the CD reading device, data accumulated in the Len’s buffer until output through a fixed low jitter clock to the DAC.

After eight years of research and two years of development, PS engineering has been able to shorten the memory requirements and improve the timing of digital audio data.

The new Lens takes advantage of advances in semiconductor architecture, found in FPGAs (Field Programmable Gate Array).

Using a single large scale integrated FPGA, PS chief DMP architect, Bob Stadtherr, devised a segmented structure including intelligent RAM, two-way isolated communication with the drive, and near-field output latches controlled by an ultra-low jitter fixed clock. The results are extraordinary.

Directstream Memory Player’s advanced Digital Lens and low-jitter fixed clock perfectly focuses the isolated datastream to the I²S, coax, or AES/EBU outputs directly to your DAC. The results of this fine, perfectly timed data stream must be heard to fully appreciate its full implications.

New life to Red Book CD

The Compact Disc was first introduced in 1982, nearly 35 years ago, as of this writing. Over the years, steady progress has been made improving its musicality. But retrieving all that is possible from this optical medium has remained somewhat elusive until the introduction of the DMP.

Most engineers in their field, including their own, failed to recognise the critical need for timing perfection to appreciate all that is available on CD.

Not until 2009, with the introduction of the PerfectWave Transport, did they begin to understand that there was more to CD than we had ever imagined.

The PWT demonstrated that careful extraction of data, coupled with isolation of the output clock, yielded unexpected benefits: more information than we knew existed.

Their next uncovering of what treasures lay hidden in the CD was even bigger.

DirectStream DAC. DirectStream DAC’s inventor, Ted Smith, opened their eyes to what was possible to render (playback) from the original optical storage method—once believed to be so lacking that only higher resolution upgrades could salvage the sound.

The PWT opened their eyes to what could be extracted, the DirectStream DAC turned the lights on for what could be rendered, and the DMP has finally opened wide the door to what is possible when extraction and timing are near-perfect.

Cover art and song titles

DMP enjoys a new user interface that includes song titles and tracks that can be read from a distance.

Like its predecessor, the PWT, album art can be automatically downloaded when DMP is connected to the internet.

Every time you play a disc (and are connected to the internet) a copy of the cover art and song titles are kept for you on your own private library page, accessed through their website.

From your personal page it is a simple matter to correct any of the CD’s information, change cover art and polish your CD collection.

SACD extraction

Sony and Philips corporations introduced the CD’s successor, the SACD (Super Audio Compact Disc) in 1999, 17 years after the original launch.

Instead of downsampled PCM from higher resolution original recordings, which many Red Book CDs are based upon, SACD held the promise of access to the original master tape or recording through a new format, PDM (Pulse Density Modulation) that Sony and Philips rebranded as DSD (Direct Stream Digital).

Because this new high-resolution digital format was essentially identical to the master tape, strict copyright protections were put in place to protect the rights of artists and recording labels.

Those protections remain in place today, as well they should.

Most collections of SACD have only been heard through Sony/Philips authorised DACs, internal to the players, unavailable as a separate digital audio datastream to external DACs.

PS Audio’s DMP is one of the first transports to provide external access to the pure DSD layer on SACD.

Directstream Memory Player can do this, legally, because the raw data stream cannot be copied.

DMP owners with PS Audio’s DirectStream DAC, or DirectStream Junior, can access this encrypted layer through their unique I²S interface.

Once connected, DMP authenticates the presence of a PS Audio authorised DAC and, for the first time, listeners can get closer to master tapes than ever thought possible.

DirectStream DACs are pure DSD based and nothing sounds quite as magical as DSD copies of master tapes processed into exquisite analog through DirectStream DACs.

I2S through HDMI output

There are three ways to get digital audio data out of the DMP: S/PDIF, AES/EBU or I2S HDMI.

I2S is the preferred method if you have a PS Audio DAC or any manufacturer’s DAC that can receive it.

Three such I²S interface are provided, allowing for 6-channel high resolution audio to be streamed from DMP.

S/PDIF (and AES/EBU) are the standard delivery methods found on all transports and, while excellent, remain a compromised format.

Standard digital outputs take three separate internal clocks along with the raw music data and combine them into one stream to the DAC.

This mashup of music and clocks causes the audio to sound flat and harsh compared to I2S.

A much better way of delivering the music is what I2S does, by transferring the clocks and data on separate wires within the HDMI cable, and the audible results are impressive.

Simply use any HDMI cable between the DMP and appropriate DAC and you are transferring data perfectly, through I2S.

A growing number of DACS and devices are adopting the PS Audio HDMI standard for digital audio transmission because of its superior audio quality.

Powerful analog discrete power supply

Clean and well-regulated power is essential for a high-performance universal disc player like the DirectStream Transport.

Instead of the typical switch mode power supply, a fully analog approach is taken with DMP.

Three separate and isolated analog power sections make up DMP’s power supply.

Fed from a large toroidal power transformer with three galvanically isolated windings, each of the three power stages utilises discrete full wave rectification based on high-speed low-loss diodes.

Energy storage for the three sections comes from a bank of low ESR high-value capacitors bypassed by non-inductive film capacitors.

Each of the three power storage banks are then double regulated by discrete, linear, voltage regulators which reduce ripple to the microvolt level and lower impedance to well below an Ohm.

Playback of stored data

The front panel USB input on DMP is available for small music collections stored on USB drives.

Plug in a USB thumb drive and its contents can be accessed and played back through DMP.

While the instrument itself is capable of handling large numbers of tracks, selection can become cumbersome if there are too many.

Tracks from the data drive are displayed in small groups on Directstream Memory Player’s touch screen, and navigating larger libraries can be time consuming.

PS engineering added this input as a courtesy port offering quick access to a friend’s favorite album or track.

They imagine being at a consumer audio show and customers wishing to hear music stored on their thumb drives will find this input convenient and excellent sounding.

CD / SACD Collections

Many high-end audio music lovers still have large CD collections as well as small to medium sized SACD and high resolution PCM (like HRx) libraries.

Few of us are eager to unload the hundreds, often thousands, of discs we have collected over the years.

But we know there’s far more to be gotten off those discs than most of us now enjoy.

The DirectStream Memory Player changes all that, disrupting the status quo, changing what’s possible in the digital audio landscape.

Owning the DMP is an investment, one that will pay off in a rich musical experience for years to come.

DMP offers the chance to hear what you’ve been missing on your discs, whether Red Book CD, CDR’s from downloads, HRx, or the master DSD layer on SACD.

You have invested much in accumulating your music library.

Now, it’s time to really hear what’s been locked inside for so long.

Directstream Memory Player is the finest transport mechanism they know how to build.

We trust you’ll enjoy the new DirectStream Memory Player as much as we do.

Perhaps the last great transport ever made

The chassis of the DMP is a metal sculpture of aluminium and steel, weighing in at 20 pounds of elegance and beauty.

The top cover is a hand painted, hand polished piano black cover that has been lavished over for hours.

The DirectStream Memory Player has been a work of passion; a quest for perfection in musical excellence.

The instrument is assembled, programmed and tested at their production facility in Boulder Colorado by skilled craftspeople.

There is a measure of pride of workmanship that goes into every one of these products and it shows from the moment you open the unit up and plug it in.

Directstream Memory Player Specifications

Unit Weight 22 lbs [13.5 kg]
Unit Dimensions 14” x 17” x 4” [ 36cm x 43cm x 10cm]
Shipping Weight 31 lbs [19 kg]
Shipping Dimensions 20.5”x 24” x 10” [52cm x 61cm x 25cm]
Power requirements
Input Power Model specific 100VAC, 120VAC, or 230VAC 50 or 60Hz
Power Consumption 30W
Input sources I2S(2), Coax, XLR Balanced, TOSLINK, USB, Network Bridge slot
Optical discs CD Standard Digital Audio

CD-R/RW CD Data Discs with audio files

HDCD High Definition CDs

SACD Super Audio CD Stereo or Multi-Channel

DVD-R/RW DVD Data Discs with audio files

USB Drive USB Flash Drive with audio files
File Format AAC FLAC OGG





I2S 3 (Front, Rear, Center/Sub)

Connector HDMI Type A

(Uses HDMI connector but not compatible with HDMI inputs)

PCM output 44.1KHz to 192KHz

DSD output 2.8MHz

Coax 3 (Front, Rear, Center/Sub)

Connector RCA

PCM output 44.1KHz to 192KHz

DSD output DSD over PCM 2.8MHz (176.4KHz)

Balanced 1 (Front only)

Connector XLR Male

PCM output 44.1KHz to 192KHz

DSD output DSD over PCM 2.8MHz (176.4KHz)



PS Audio

PS Audio is now based in beautiful Boulder Colorado, with engineering, sales, marketing, production and administration facilities nestled up against the beautiful Rocky Mountains. Their company is still family owned and operated, a tradition they are proud of. Products are engineered in-house from the ground up using some of the most sophisticated design and evaluation tools available. They are strong proponents of utilising the latest technologies in service of building state-of-the-art high value music products for our customers. Their core products are all hand built to investment level standards in their modern production facilities in Boulder Colorado. They are a proud employer of more than 30 local artisans who design, build and make their products available all over the world. From their family to yours, let’s keep the spirit of great music and performances alive and well. If you’re in the neighborhood, come by and visit!

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