soundberry Decoder esterno hi-end

Decoder esterno hi-end

Benchmark dac 1

da collegare a qualsiasi dvd o cd player

Per salire di qualita' con qualsiasi lettore abbiate,questa e' la strada.

Alternativa ai lettori da oltre 2000 euro.

1000 euro:in effetti ancora troppi:

MA E' ARRIVATA ALLA FINE LA SOLUZIONE

The DAC1 is a two-channel, 24-bit, 192-kHz Digital-

to-Analog audio converter. The DAC1 is perhaps one of the more significant recent advances in digital audio conversion technology. The DAC1 provides some of the finest analog conversion through 192-kHz and all sample rates playback with a 52-kHz analog bandwidth. The performance of the DAC1 is unrivaled. THD+N is an astonishing low -106 dB (0.0005%) measured at 0 dBFS, at any playback frequency, at any sample rate, with any degree of input jitter, and it just gets better from there.

Listening to audio from the DAC1 is an amazing experience. The distortion free output is so pristine it truly feels as though someone has finally lifted the curtain! Now you can hear detail that was previously masked by jitter induced artifacts and distortion. If it was an exceptional recording, you'll hear it, if it wasn't, you'll hear that as well.

Many DACs derive their system clock directly from the AES receiver making them very susceptible to jitter. These DACs can rarely achieve their rated performance in real world applications. By contrast, the DAC1 takes full advantage of our jitter free UltraLock™ technology. On the test bench, or at the end of 1000' of cable, the DAC1's performance is the same! Frankly, we don't think you should have to be a transmission line expert to be a great audio engineer.

Additional features include auto-processing of pre-emphasized digital audio and our latest HPA-2 headphone amplifier technology. This technology features distortion levels of 0.0003% under load. The audio output levels may be controlled from the front panel by the same gain control that feeds the headphone amplifier or it may be preset to a precise level with multi-turn trims. The preset gain range is +10 dBu to +29 dBu at 0 dBFS. The DAC1 has built-in international 115/230 volt power.

The DAC1 is essential equipment for mastering studios, high quality recording studios, high-end home audio systems, or anywhere un-colored digital playback is demanded.

The up-sampling DAC1 is now listed as a Stereophile Magazine recommended component. John Atkinson called the DAC1 "...a true audiophile bargain."

The DAC1 - Winner of a PAR Excellence Award at the 2002 AES Convention, the Reviewers Pick Award from Pro Audio Review, and nominated for a Mix Magazine TEC Award.

The DAC1... you never heard it so good!

Features

2-channel, 24bit, 192-kHz D-to-A conversion

All sample rates playback with a 52-kHz analog bandwidth

THD+N = -106 dB (0.0005%) measured at -0 dBFS, any sample rate, any test frequency, with any degree of input jitter!

116 dB signal-to-noise ratio @52 kHz, A weighted

AES/EBU (XLR & Coax) and S/PDIF (XLR, Coax, & Toslink) inputs

Digital input source-selection switch

Balanced, low-Z XLR outputs

+29 dBu output level capability

Unbalanced RCA outputs

Variable or preset output level controls, switch selectable

Direct connection to powered monitors

Built-in Benchmark HPA-2, a high-output, ultra-clean headphone amplifier with dual outputs jacks

Total jitter immunity via UltraLock™ technology!

Phase Accurate D-to-A conversion across any number of channels

1 power, 2 error indicating LEDs

Internal low-radiation toroidal power supply

International 115-230 input voltage range

Automatic De-emphasis for 44.1, 48, 88.2, and 96 kHz when Pre-emphasis bit is set

Milled aluminum front panel

1/2 wide, 1RU chassis

Rack mount kit available

CE Compliant

John Watkinson is the author of the book "The Art of Digital Audio". In the July/August 2002 edition of resolution, a new audio magazine from the UK, John wrote an article entitled The cable snake in a regular column feature known as "slaying dragons". In that article he said "...On the other hand, if the DAC has not been properly engineered, changing the cable could affect the amount of jitter reaching the converter. Thus we finally have a practical use for exotic cables as DAC testers. If the use of an exotic cable makes a DAC sound better, then the DAC is not performing adequately and should be repaired or redesigned. If the goal is actually to achieve high quality, rather than just claim it, then this is one of the fundamental tests a designer should use." And we would add, "Whoever heard of a DAC operating without jitter induced sidebands over 1000' feet of garden variety data cable? Now that's a properly engineered device!"

UltraLock™ Performance - Distortion Vs. Jitter on Digital Input Signal

The following graph is a look at the Eye pattern for 1000' of Belden MediaTwist® Cat 5e (11872A - Green) and 1000' of General Cable Co. Cat 5e (Cat # 2133458H) - Yellow, available at Home Depot, along with the minimum signal eye pattern of the DAC1 - Blue. Also included in this graph is the normal AES/EBU four volt output level found in normal professional digital audio equipment - Cyan. The red "box" is the minimum tracking recommendation for a digital audio receiver as specified by the Audio Engineering Society. As can be seen the DAC1 easily operates with total freedom from jitter at the end of a 1000' length of CAT5e data cable.

Cable Eye Patterns from: Normal AES (Cyan), end of 1000' of Belden MediaTwist® (Green), 1000' of Home Depot Cat 5e Cable (Yellow) and Minimum DAC1 Input Requirements (Blue)

The last graph shows the output of the DAC1 having been fed 12.75 unit intervals of jitter. Since jitter creates double sideband modulation products from the "carrier", in this case a 10 kHz audio tone, and the jitter frequency is 5-kHz, jitter induced sidebands of 5 and 15-kHz should be seen if jitter makes it to the DAC decoder chip. The complete absence of these 5-kHz sidebands shows the power of UltraLock™ in providing total freedom from jitter induced audio products within the DAC1.

Total Freedom from Jitter Induced Sidebands (12.75 Unit Intervals of 5-kHz Jitter on the Audio Data)

Digital Inputs

Number of Digital Inputs (switch selected)

3 (XLR, Coaxial, TOSLINK)

Number of Audio Channels

Input Sample Frequency Range

28 to 195 kHz

Maximum Input Word Length

24 bits

Digital Input Impedance on XLR input

110 O

Digital Input Impedance on Coaxial input (Jumper Selected)

75 O or Hi-Z (Bridging)

Transformer Coupled Digital Inputs

Yes

DC Blocking Capacitors on Digital Inputs

Yes

Transient and Over-Voltage Protection on Digital Inputs

Yes

Minimum Digital Input Level

300 mVpp on XLR, 150 mVpp on Coaxial

Jitter Tolerance (With no Measurable Change in Performance)

>12.75 UI sine, 100 Hz to 10 kHz > 3.5 UI sine at 20 kHz > 1.2 UI sine at 40 kHz > 0.4 UI sine at 80 kHz > 0.29 UI sine at 90 kHz > 0.25 UI sine above 160 kHz

Jitter Attenuation Method

Benchmark UltraLock.

Balanced Analog Outputs

Number of Balanced Analog Outputs

Output Connector

Gold-Pin Neutrik™ male XLR

Output Impedance

60 O

Output Level Calibration Controls

10-turn trimmers (1 per output)

Calibration Adjustability

2 dB / turn

Output Level Range (at 0 dBFS) In Calibrated Mode

+9 dBu to +29 dBu (Attenuator off) -1 dBu to +19 dBu (Attenuator = 10 dB) -11 dBu to +9 dBu (Attenuator = 20 dB) -21 dBu to -1 dBu (Attenuator = 30 dB)

Output Level Range (at 0 dBFS) In Variable Mode

Off to +29 dBu (Attenuator off) Off to +19 dBu (Attenuator = 10 dB) Off to +9 dBu (Attenuator = 20 dB) Off to -1 dBu (Attenuator = 30 dB)

Output Level Variation with Sample Rate (44.1 kHz vs. 96 kHz)

< +/- 0.006 dB

Unbalanced Analog Outputs

Number of Balanced Analog Outputs

Output Connector

RCA

Output Impedance

30 O

Output Level Calibration Controls

Shared with Balanced Outputs

Output Level Range (at 0 dBFS) In Calibrated Mode

-6 dBu to +13.5 dBu

Output Level Range (at 0 dBFS) In Variable Mode

Off to +11 dBu

Calibration Adjustability

2 dB / turn

Output Level Variation with Sample Rate (44.1 kHz vs. 96 kHz)

< +/- 0.006 dB

Factory Preset 2vRMS (8.2 dBu)

HPA2™ Headphone Outputs

Number of Headphone Outputs

Output Connector

¼" TRS

Output Impedance

0 O

Output Level Control

Stereo Control on Front Panel

Output Level Range (at 0 dBFS) into 60 O Load

Off to +21 dBu

Audio Performance

Fs = 44.1 to 96 kHz, 20 to 20 kHz BW, 1 kHz test tone, 0 dBFS = +24 dBu (unless noted)

SNR — A-Weighted, (0 dBFS = +20 to +29 dBu)

116 dB

SNR — Unweighted, (0 dBFS = +20 to +29 dBu)

114 dB

SNR — A-Weighted at low gain, (0 dBFS = +9 to +18 dBu)

114 dB

THD+N, 1 kHz at 0 dBFS

-105 dBFS, -105 dB, 0.00056%

THD+N, 1 kHz at -1 dBFS

-107 dBFS, -106 dB, 0.00050%

THD+N, 1 kHz at -3 dBFS

-110 dBFS, -107 dB, 0.00045%

THD+N, 20 to 20 kHz test tone at .3 dBFS

-110 dBFS, -107 dB, 0.00045%

Frequency Response at Fs=48 kHz

+/- 0.1 dB (20 to 20 kHz) -0.02 dB at 10 Hz -0.20 dB at 20 kHz

Frequency Response at Fs=96 kHz

+/- 0.1 dB (20 to 20 kHz) -0.02 dB at 10 Hz -0.20 dB at 20 kHz -0.85 dB at 40 kHz -2.5 dB at 45 kHz

Crosstalk

-100 dB at 20 kHz -125 dB at 1 kHz -130 dB at 20 Hz

Maximum Amplitude of Jitter Induced Sidebands

< -141 dB (10 kHz 0 dBFS test tone, 12.75 UI sinusoidal jitter at 1 kHz)

Maximum Amplitude of Spurious Tones with 0 dBFS test signal

< -126 dB

Maximum Amplitude of Idle Tones

< -128 dB

Maximum Amplitude of AC line related Hum & Noise

< -126 dB

Interchannel Differential Phase (Stereo Pair)

+/- 0.5 degrees at 20 kHz

Interchannel Differential Phase (Between DAC1 Units)

+/- 0.5 degrees at 20 kHz

Delay (Digital Input to Analog Output)

1.01 ms + (48/Fs) 2.10 ms at 44.1 kHz 2.01 ms at 48 kHz 1.55 ms at 88.2 kHz 1.51 ms at 96 kHz

Maximum Lock Time — after Fs change

100 ms

Soft Mute Ramp Up/Down Time

10 ms

Mute on Receive Error

Yes

Mute on Lock Error

Yes

Mute on Idle Channel

50/15 us De-Emphasis Enable

Automatic in Consumer Mode

De-Emphasis Method

Digital IIR

De-Emphasis Supported at

Fs = 32, 44.1, 48, and 96 kHz

Group Delay (Latency)

Delay from digital input toanalog output is a function of sample rate

2.72 ms at 28 kHz 2.51 ms at 32 kHz 2.10 ms at 44.1 kHz 2.01 ms at 48 kHz 1.55 ms at 88.2 kHz 1.51 ms at 96 kHz 1.45 ms at 108 kHz The delay can be calculatedusing the following formula: Delay = 1.01 ms + (48/Fs) Where Fs = the sample rate in Hz.

LED Status Indicators

LED Location

Front Panel

Power (AC power is connected and +5 V supply is operating)

1 (Blue)

Error (Error on the active digital input)

1 (Red)

Non PCM (Non-compatible digital audio format on active input)

1 (Red)

AC Power Requirements

Input Operating Voltage Range — VAC RMS

110 V setting — 90 V min, 140 V max 220 V setting — 175 V min, 285 V max