Benchmark DAC 1

Benchmark DAC 1, DAC Προενισχυτής, ενισχυτής ακουστικών, ψηφιακός μετατροπέας DAC, προενιεχυτής μετατροπέας οπτικο΄ψηφιακό σήμα, ψηφιακό σήμα σε αναλογικό Audio σήμα, ενισχυτής ακουστικών, ισχύς 800mWatt 8-600 Ω, απόκριση συχνοτήτων 10Hz ~ 45,000 Hz, Aνάλυση και ταχύτητα επεξεργασίας ψηφιακού σήματος σε  192kHz/24bit, σε OPT COAX 192kHz/24bit, Διαστάσεις 249×45×220 mm, Bάρος 1.55 Kg, Benchmark DAC 1**, Παρακαλούμε επικοινωνήστε στο 210 3845676 για επιβεβαίωση του αποθέματος και τιμής, Αποστολές εμπορευμάτων σε όλη την Ελλάδα, Δυνατότητα Διακανονισμού – Δόσεων – Ανταλλαγών, Εγγύηση 3 μήνες,

FEATURE SUMMARY:
XLR balanced, BNC coaxial, and TOSLINK optical digital inputs – front-panel switch selectable
High level, +4 dBu balanced analog outputs, +29 dBu maximum output level
Jumper-selected 10, 20, or 30 dB pads on balanced outputs
-10 dBV unbalanced outputs, +13.5 dBu maximum output level, factory set to +2vRMS @ 0dBFS (8.2 dBu)
Two HPA2™ high-current, high-output ¼” headphone jacks
Front-panel knob controls all analog outputs or just the headphone outputs (selected with rear-panel switch)
Analog output mute function on rear-panel switch
Preset output levels use multi-turn trimmers – one 10-turn trimmer per output, 20 dB Range, 2 dB/turn
Total jitter immunity with Benchmark, phase-accurate UltraLock™ technology
Two Error LED’s, (no digital input, non-PCM digital input)
Power Indicator LED
THD+N = -107 dB, 0.00045% @ -3 dBFS input, -105 dB, 0.00056% @ 0 dBFS input
Automatic de-emphasis in consumer mode at 44.1, 48, 88.2, or 96 kHz when pre-emphasis bit is set
Reliable and consistent performance under all operating conditions
115 V, 230 V, 50-60 Hz international power supply with very wide operating range
Low radiation toroidal power transformer significantly reduces hum and line related interference
Low power consumption (8 Watts typical program, 16 Watts peak)
Meets FCC Class B and CE emissions requirements

DAC1 Review – John Marks, Stereophile
by Benchmark Media Systems July 20, 2003

DAC1 ~ Stereophile
Benchmark DAC1

DAC1 – «Genuinely High- End»
«At $850, the Benchmark DAC1 is, in my experience, the lowest-priced piece of digital gear that can give sonic performance that is not just improved mid-fi, but genuinely high-end.»

«This column will examine two bits of kit from the polar ends of the price spectrum: Benchmark Media System’s DAC 1 ($850), and TEAC’s massive two-box Esoteric P-70/D-70 CD playback system ($14,000).»

«The Benchmark was slightly more articulate in the musical line, and slightly more detailed in spatial nuances, particularly the localization of individual images in space, and in soundstage depth.»

«All you need is a transport to feed the DAC1, a digital signal, a power amplifier, speakers, and a few bits of wire, and you have a stripped-down hot rod of a system that is ready to rock’n’roll.»

- John Marks, Stereophile,

Γενικές Πληροφορίες   Πληροφορίες Χρήσεως,

Τεχνικά Χαρακτηριστικά

SPECIFICATIONS:
DIGITAL INPUTS:
Number of Digital Inputs (switch selected): 3 (XLR, Coaxial, TOSLINK)
Number of Audio Channels: 2
Input Sample Frequency Range: 28 to 195 kHz, 28 to 96 kHz Optical
Maximum Input Word Length 24 bits
Digital Input Impedance on XLR input: 110 Ω
Digital Input Impedance on Coaxial input (Jumper Selected): 75 Ω 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: 2
Output Connector: Gold-Pin Neutrik™ male XLR
Output Impedance: 60 Ω
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 +27 dBu (Attenuator off)
Off to +17 dBu (Attenuator = 10 dB)
Off to +7 dBu (Attenuator = 20 dB)
Off to -3 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: 2
Output Connector: RCA
Output Impedance: 30 Ω
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: 2
Output Connector: ¼” TRS
Output Impedance: 0 Ω
Output Level Control: Stereo Control on Front Panel
Output Level Range (at 0 dBFS) into 60 Ω Load: Off to +21 dBu
DAC1 Instruction Manual Rev O Page 11
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 – any sample rate
Interchannel Differential Phase (Between DAC1 Units Fs<110): +/- 0.5 degrees at 20 kHz – Fs < 110 kHz
Interchannel Differential Phase (Between DAC1 Units Fs>110): +/- 4.1 degrees at 20 kHz – Fs > 110 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
1.28 ms at 176.4 kHz
1.26 ms at 192 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: No
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
DAC1 Instruction Manual Rev O Page 12
GROUP DELAY (LATENCY):
Delay from digital input to analog 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
1.28 ms at 176.4 kHz
1.26 ms at 192 kHz
The delay can be calculated using 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:
50-60 Hz
8 Watts Idle
8 Watts Typical Program
16 Watts Maximum
Fuses (2 required) – 5 x 20 mm
100 V to 130 VAC operation – 0.5 Amp 250 V Slo-Blo®
Type
200 V to 260 VAC operation – 0.25 Amp 250 V Slo-Blo®
Type
Input Operating Voltage Range – VAC RMS
110 V setting – 90 V min, 140 V max
220 V setting – 175 V min, 285 V max
DIMENSIONS:
½ Rack Wide, 1 RU High
8.5” (216 mm) Depth behind front panel
9.33” (237 mm) Overall depth including connectors but without power cord or BNC-to-RCA adapter.
9.5” (249 mm) Wide
1.725” (44.5 mm) High
WEIGHT:
DAC1 only: 3.5 lb.
DAC1 with power cord, BNC-to-RCA adapter, and manual: 4.5 lb.
Rack mount kit (blank panel, junction block, and rack-mount screws): 0.32 lb.
Shipping weight: 7 lb.,

Μεταχειρισμένα

* * * * *  Demo ή Καινούργιο, Άριστη κατάσταση, κουτιά, manual και εγγύηση.

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* * *        Χρησιμοποιημένο, άψογη λειτουργική κατάσταση,  ίσως κάποια αμυχή, ίσως να μην υπάρχουν κουτιά.

* *          Χρησιμοποιημένο, άψογη λειτουργική κατάσταση,