DC MMB DIGITAL PROCESSOR. OHPC digital transmission system for high- quality transmission. O New MMB type D/A conversion system ensuring bit. My Accuphase DC 91 converter shuts itself off after We do Hi I just bought a nice Accuphase DP/DC combo and I have a few questions: The light. Accuphase DC & DP for sale. I have decided to sell these two units only because they get very little use. I am the second owner. I would say I have only.
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It should be realized that no DAC is perfect. The conversion process from the digital to the analog domain introduces a conversion error that manifests itself as noise and distortion products.
You can bet your bottom dollar that these distortion products are not consonant with the music. A number of competing approaches are aimed at minimizing this conversion error. Broadly dc9-1, these can be categorized as based on either single-bit or multibit DAC technology.
Their assault on the state of the art can best be described as brute force in nature. Theoretically, the noise floor, hence the conversion error in an MMB system, decreases by 3dB every time the number of paralleled identical DACs doubles. If 16 DACs are used per channel, then the error would decrease by a factor of 12dB. There is, of course, a point of diminishing returns, as the degree of improvement increases slowly with the increasing number of DACs used.
Believe it or not, that’s exactly dcc-91 Accuphase did! A transport of delight The DP transport is designed to complement the Dx-91 processor both cosmetically and in performance.
One supply is dedicated dc-9 the digital signal processing, microprocessor, wccuphase display circuitry. The other dc-1 the spindle drive motor, sled, and the focusing and tracking assemblies. The disc-drive motor features sapphire bearings and a heavy-duty spindle, which should offer many years of stable drive. No stone is left unturned in Accuphase’s relentless pursuit of perfection. The laser pickup is provided with an ultracompact RF amplifier that’s integral to the pickup assembly.
Ordinarily, the RF amplifier is external to the pickup, which renders its feeble output signal vulnerable to externally induced noise. Another design aspect that’s been well attended to is the mechanical coupling between the disc tray and the rotating assembly. Remember all those disc dampers that were touted as cures for digititis? I bet everyone with an early-’80s CD player has purchased one of them in the hopes of finally arriving at Sony’s promised land of “perfect sound forever.
The DP offers every conceivable type of digital output, but the star attraction is an ST-type optical that uses a Hewlett-Packard transmitter operating at a data transfer rate accphase million bits per second. A quartz fiberoptic cable is supplied for this connection.
Accuphase DC-91 & DP-90 DIGITAL PROCESSOR (DAC) AND TRANSPORT [Expired]
I experimented with every available connection, and can tell you that the ST-type rates a clear accuphass sonically. The balanced XLR output was a close second, giving up a touch in the areas of detail resolution and timing precision.
The coax output finished in third place; not surprisingly, the bandwidth-limited TosLink accuphzse up the rear. Digital control In reality, the DC is more than just a digital processor. Think of it as a digital control center. The unit has 13 digital inputs. All digital inputs are designed to handle bit audio data, to allow for future expansion.
Two bit digital outputs are also provided to maintain compatibility with the next generation of digital components. A smart Input Selector allows easy switching between the various inputs while retaining in memory all settings eglevel and phase associated with each input.
Absolute polarity selection and level control are accomplished in the digital domain. The signal level is adjusted by a DSP chip with bit output precision.
I found the digital level control function not only quite sonically transparent, but also quite convenient. It allows volume adjustment from the listening seat using the remote control, and makes it possible to drive the processor’s analog output either balanced or unbalanced directly into a power amp.
The DC offers the user the choice of using dither triangular probability density at the bit level.
This will optimize sound quality for those lucky enough to own true bit sources. My only previous long-term experience with a “super” transport had been the C. It wasn’t so much that it sounded so different from my reference at that time the original Theta Data ; rather, the unique manner in which it affected the sound startled me. It sounded as though I had plugged a tubed preamplifier in to the signal chain.
The tonal balance became laid-back; the highs were softer and a bit rolled-off, lending a sweeter disposition to the upper mids. Even the bass quality was impacted, the lower registers sounding fc-91 and less precise than before. How tube sound managed to filter through the C.
The effect, of course, was musical, but euphonic. Accuphase sound The Accuphase transport, on the other hand, didn’t meddle with the overall tonal balance. Its top-to-bottom voicing was neutral, allowing the recording’s inherent balance to shine through. Recordings with lush midranges were given full expressive scope; threadbare recordings were revealed for what they are, without any editorializing. The DP’s resolution of low-level detail was exemplary I’ll have more to say about this laterbut its most endearing accuphase by far were its timing precision and resolution of rhythmic nuances.
Because of its split-second duration, the attack portion of musical transients is most susceptible to corruption by digital circuitry. The coherence of analog sound derives from the fact that the attack and decay portions of each transient are inexorably bound together in zccuphase. However, in the digital domain, accuphaase music’s time base must be reconstructed. And, as we all know by now, jitter can play havoc with timing precision, so a reconstituted musical transient can sound rc-91 if it were pasted together.
Like an ill-fitting suit, digital sound can often feel strange and uneasy. Still absolutely beautiful gear.
Yes, computer audio has come a long way but sometimes it’s nice to turn off all the screens and slip in a disc! Over two years now and still haven’t finished importing those Cd’s to the HD. Sometimes putting in a disc and pressing play is quite relaxing.
Am so fed up acccuphase hi-end. The real question is this- accuhpase Accuphase still service these “vintage” spinners? Inas the compact disc enters its second decade of commercial reality, it’s fair to say that the associated hardware has come of age, exorcising at last the digital gremlins of time-base jitter and quantization noise.
The simplistic digital circuitry of yesterday has given way to considerable design sophistication that deals directly with jitter and low-level nonlinearities. Log in or register to post comments. Simply beautiful Submitted by volvic on December 21, – Always wanted one but did not want to dish out that kind of cash, but simply as a trophy piece, but that is what my Ec-91 CD1a is these days so pointless considering how far computer audio has come.
The real Submitted by Allen Fant on December 22, – 1: Related Latest Galleries Recommended. Rega Research Apollo CD player. Sonographe SD CD player.
Used Accuphase DC D/A Converters for Sale |
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