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Кое-кто не гнушается заявлений:
"Дескать мы из СD делаем SACD"
http://www.musical-fidelity.co.uk/products/index.html
Specifications
Digital-to-analog converter type Upsampled by 96Hz converter
Architecture 24 bit Delta-Sigma (Bitstream)
8 x oversampling digital filter
Frequency response l0Hz - 20kHz ± 0.05dB
S/N ratio >98dB unweighted
>109dB 'A' weighted
THD & Noise < 0.003% 10Hz - 20kHz
Total correlated jitter <200pS
Wow and flutter Unmeasurable
Power requirements 100/115/230V AC 50/60Hz
Factory preset for country
Dimensions (mm) 485 x 145 x 370 (W x H x D)
Height includes feet, depth includes terminals.
Weight 15.5kg (unit only)
Standard accessories Remote control handset.
Four batteries (SUM-4, AAA, LR03).
Music lovers make a big investment in their compact discs. Did you realise that a collection of only 200 discs represents £3000 investment? Now here comes SACD, and it sounds great. Does this mean your CDs are obsolete? No, it does not!
Musical Fidelity believes that music lovers deserve better. So we developed the Nu-Vista 3D choke regulated CD player. It makes ordinary CDs sound as good as SACDs.
The Nu-Vista 3D CD player is the last Nu-Vista product ever, and the greatest. To improve CD performance up to SACD level, we first analysed why ordinary CD players sound different to SACD. The most easily identified difference is the extended frequency reponse of SACD, up to 100kHz. But most people over the age of 25 can't even hear up to 18kHz. However, people in their sixties and older can hear the difference between SACD and CD, so it can't be down to HF performance. In fact, our research showed that the audible differences between the two are caused by in-band, non-linear distortions, group delay, phase-shifts and intermodulation anomalies.
We have engineered the Nu-Vista 3D to ensure that it has dramatically better HF performance than ordinary CD players in distortion, phase shifts, group delay, inter-modulation, non-linearities and noise ratios.
The result is that in-band (20Hz to 25kHz), the Nu-Vista 3D actually measures better than SACD.
To achieve this, the Nu-Vista 3D up-samples 24-bits at 93.75kHz. This takes all digital error artifacts out of band so they're not a factor up to about 35kHz. This enabled us to simplify and re-design the digital and analog filters to be far above the audio band, thus their phase shift and group delay is out of band. This allows for a reduction in overall feedback and simpler circuitry.
Then we put seven choke-regulated power supplies in the Nu-Vista 3D. We believe that the power supply almost is the amplifier, and we believe that choke-regulated power supplies have audible advantages. Thus we applied separate choke-regulated power supplies for the DAC, spindle motor, display, nuvistor HT, nuvistor LT, logic and remote control.
We're able to provide all the necessary chokes by investing in the tooling to make PCB-mounted, dual-layer, differential chokes.
An important point about chokes is that not only do they allow no power supply noise IN, but also none is allowed OUT. By putting choke regulation on every vital state of the CD player, we have ensured inter-stage isolation and an almost-silent power supply. Thus all elements of the circuit perform perfectly, with no interference from any other part.
Better power supplies = Better noise ratio
Better noise ratio = Better dynamic range
Better dynamic range = Better resolution
Fanatical attention to internal layout helps, too. In small-signal electronics, small details can have a big effect. So we paid close attention to every detail of the layout, which was designed to minimise or negate any stray field from any part of the circuit. We even enclosed the mechanism in its own casework within the outer case. There is no stray field from the mechanism or its components. We may be crazy to do this, but we are on a mission to save the consumer a lot of time, money and effort by producing a CD player that makes ordinary CDs sound as good as SACDs.
And then there's the nuvistor stage.The 3D has an extraordinarily sophisticated circuit, in which the nuvistors are used in dual-differential Class-A mode. We designed the circuit to incorporate any analog filtering required by the digital electronics in a simple, two pole, passive network within the nuvistor stage. In contrast, the A3CD (still one of the best-measuring and sounding CD players in the world) has a seven-pole, active, hybrid feedback filter. The pass-band ripple effects on the A3 CD are very low. In the Nu-Vista 3D, the ripple effects are much lower still.
The HT and LT power supplies have their own, separate choke regulation. Both are self-balancing, to ensure that the nuvistors are always working under optimum voltage conditions. All of the other active components in the nuvistor circuitry were chosen for optimum bandwidth, noise, current and gain qualities, to fit in perfectly with the nuvistors.
The output stage is a fully complementary, high-current, low impedance, high damping factor arrangement, with very low feedback and wide bandwidth. Thus the loading of the interconnect cable and the amplifier does not create any colouration from the circuitry.
The Nu-Vista is a limited edition of 500. Musical Fidelity has enough nuvistors to build the 3Ds and retain a spare set of tubes for every unit. As with the other Nu-Vista products, the 3D will be sold out quickly and is sure to become an audio classic.
Features Benefits
24-bit up-sampling. Incredibly accurate, hash and grain-free sound quality, similar to SACD.
96kHz sampling frequency. Takes all digital noise and artifacts out of band.
Super-sophisticated nuvistor circuitry. Gives an extraordinary blend of sound quality, clarity, dynamic and transient response.
Full dual-layer differential choke regulation. Gives complete inter-stage isolation and a perfect power supply for each stage of the circuit.
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Для интересующихся как 747 воспроизводит SACD,CD,DVD-Audio(+) -- zippo999 -- 05.02.02@13:01 (Чит.: 261)