AMR CD-777 är en lite förenklad version av toppmodellen CD-77 men med alla funktionerna kvar. Läs specifikationerna så förstår du.
CD-777 har dessutom två digitala ingångar, USB och S/P-DIF (RCA) vilket gör att du får tillgång till AMR:s fina DA omvandling och utgångssteg om du väljer att ansluta din dator, din Squeezebox, eller någon annan signalkälla med digital utgång.
• Top-loading proprietary AMR transport mechanism
• Direct Master I; no digital or analogue filter
• Direct Master II; no digital filter, anti-sin(x)/(x) analogue filter
• Oversampling 2x
• Oversampling 4x
• Upsampling 96 kHz
• Upsampling 192 kHz
Digital Audio Inputs:
• 1 x USB interface, 1 X S/P-DIF Interface
• 1 x RCA; 1 x XLR per channel
• 1 X S/P-DIF Interface
Thermionic Electron Valves amplification stage:
• 6H1n-EV fitted
• ECC88, E88CC, 7308, Cca, 6DJ8, 6922,
• 6H23n-EV optional
Output voltage (Digital Full Scale):
• > 2V
• 20Hz to 20 kHz +0.0, -0.5dB
Signal-to-noise ratio “A” Weighted:
• > 100 dB
Total Harmonic Dist. + Noise (THD+N):
• < 0.3%
• > 90 dB
• > 90 dB
• 32 VA Custom EI Transformer (Digital Section)
• 32 VA Custom EI Transformer (Valve Stage)
• Standby: < 1 W
• Power on: < 45W
• 100V/120V/230V~ AC 50Hz - 60Hz
• Silver or Black
• 45 cm W by 12 cm H by 37 cm D
• 57 cm W by 49 cm H by 25 cm D (shipped)
• CD-777: 11.5 kg
AMR’s Continuous Calibration Multibit “CCMD” DAC:
At the heart of the CD-777 Processor is AMR’s ‘continuous calibration’ Multibit Digital-to-Analogue Converter. This is the first time this New Old Stock chipset has been used in a CD source and is worthy of the title “son” to the “King of Multibit” Philips TDA1541A chipset used in the multi-award winning CD-77. With AMR’s understanding of digital design down to the silicon die-level, the sonic performance of this “Prince of Multibit” chipset has been taken beyond the textbook limit. Producing visceral music that other mega-buck CD players cannot match, it is simply stunning. Along with AMR’s OptiSample, the CD-77 boasts full remote control of all sampling modes: Direct Mastering (AMR’s custom Non-Oversampling), Oversampling (2X, 4X) and Upsampling (96 kHz, 192 kHz).
Over the last few years, the pace of progress of computer-based audio has continued unabated. So much so that AMR has developed a proprietary solution: OptiCompuAudio® which allows the CD-777 to become a dedicated CD-Transport or Digital-To-Analogue Converter through either USB or S/P-DIF without a commensurate rise in jitter (unlike virtually every other approach). Underpinned by AMR’s OptiClockLock system using a proprietary TXCO clock, the result is external or computer-based audio that is at the level of direct CD playback.
Going against the grain, AMR believes that having the ultimate in digital execution would count for little if the analogue section was not just as dedicated. Hence, the analogue section of the CD-777 utilises AMR’s OptiValve® analogue stage with zero negative feedback and 6H1n-EV valves. The “EV” designation represents the premium version of this valve.
With no operational amplifiers or solid-state devices, this is a major factor behind the CD-777’s organic and “vinyl-like" music performance that will embarrass many a high-end CD player at twice or three times the price.
AMR’s expertise in specialised transformer design for audio use has led to the development of transformers with individual windings which offer the sonic benefit of individual transformers without the space required for separate transformers. Again, AMR has shunned the mainstream (and more cost-effective) approach to the use “off the shelf” transformers, preferring to have its own dedicated transformers hand-wound and hand-made. Power supply is an integral part of circuit design and AMR’s steadfast approach has ensured the highest possible quality of music performance.
The OptiDrive® transport mechanism is an in-house, ground-up design. The musical synergy was made possible through using the best genuine components - the high-precision, reliable Sony K-series laser pickup mated to the musical Phillips CD-18 servo system along with a proprietary high-torque direct-drive motor. The laser is constantly bathed in blue LED lighting to maximise the sonic performance. The software is bespoke by AMR to extract the maximum performance.
Unconventional, Dedicated Components
Underpinning the design behind each and every AMR component is the use of premium components which were chosen after judicious evaluation and extensive listening tests. These include silver leaf capacitors, Sanyo Oscon capacitors, precision wire wound resistors, 70um gold plated, military-grade printed circuit boards, German-made premium film capacitors, AMR\'s own power supply polypropylene film Music Capacitors and zero-noise Schottky rectifiers.
It is worth noting that such lavish components are seldom found in five-figure digital sources yet are found in the CD-777.