192kHz
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Benchmark’s DAC1 PRE is a reference-quality, stereo monitor controller featuring DAC1’s award-winning D-to-A conversion system, proprietary AdvancedUSB™ input, jitter-immune UltraLock™ technology, and HPA2™ headphone amplifier. The DAC1 PRE delivers pristine, seamless monitor interfacing and volume control, and interfaces with almost every type of digital and analog source.
The Dynaudio BM 5A’s are small-footprint (7.3” x 12.5” x 12.5”) active, near-field studio monitors designed for professional recording studios. Each monitor is bi-amplified with two independent 50 W amplifiers and a custom designed active crossover circuit.
Dynaudio has become renowned for their progressive approach to designing drivers and speaker electronics. After years of successful speaker development for the audiophile community, the company established a subsidiary, Dynaudio Acoustics, to offer their expertise to the world of professional audio. Today, many major recording and production studios around the world employ and trust Dynaudio Acoustics monitors.
The Sennheiser HD headphones have become some of the most popular among headphone enthusiasts and audio professionals. The HD650’s are the latest and greatest design in this lineage of high-resolution headphones. The oversized ear pieces and open-back design enable comfortable listening for hours and hours.
Benchmark’s Canare Starquad balanced analog cables use professional grade components and hand-assembly to achieve superior performance. Canare L-4E6S Starquad balanced analog conductor for ultra-low capacitance, superior noise rejection, and extended lifespan. The XLR connectors are made by Neutrik, the accepted professional standard. They utilize silver pins, and are soldered with silver solder.
DAC1 Complete Stereo Solution Components
Home and/or Office System
The Complete Stereo Solution is an ideal playback system for those rooms that don’t require mid or far-field speaker systems. The ease and simplicity of the Complete Stereo Solution allow even the technical novice to achieve high-definition audio with their DVD, CD, TV, radio, or computer system. The elegant packaging of these components melds into the décor of any room.
Recording Studio; Video and/or Audio Editing Suite
Benchmark digital converters, Dynaudio loudspeakers, and Sennheiser headphones regularly see heavy use in major recording studios all over the world. The Complete Stereo Solution offers this world-class performance in a form-factor that suits both recording studios and small-footprint editing suites. The transparent, revealing nature of this system won’t let any audio glitches slip by unnoticed. The jitter-free, low-distortion performance makes listening fatigue a non-issue – alleviating a real concern during hours of recording, editing and mixing.
DAC1 Complete Stereo Solution Applications
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Analog Audio Inputs
| Number of Inputs (balanced) | 2 |
| Connector | Gold-Pin Neutrik™ female XLR |
| Impedance | 200 k O |
| Sensitivity | -14dBu to +29 dBu (at 0 dBFS) |
Clock Reference Input
| Format | Auto-detect AES/EBU, Word Clock, and Super Clock (256x) |
| Impedance | 75 O |
| Sensitivity |
150 mV AES
200 mV Word Clock 750 mV Super Clock |
| Transformer Coupled | Yes |
| DC Blocking Capacitors | Yes |
| Transient and Over-Voltage Protection | Yes |
| Jitter Attenuation Method | Benchmark UltraLock |
Wordclock Reference Output
| Impedance | 75 O |
| Level |
5 Vpp
2.5 Vpp into 75 O |
| Transformer Coupled | No |
| DC Blocking Capacitors | No |
| Transient and Over-Voltage Protection | Yes |
Digital Audio Outputs
| Number of Digital Outputs |
1 XLR Main
1 TOSLINK Main 1 BNC Main 1 BNC Aux 1 USB |
| Connectors | Gold-Pin Neutrik™ male XLR |
| Number of Audio Channels | 2 |
| Main Output Word Length | 24 bits |
| Main Output Sample Frequencies | 44.1, 48, 88.2, 176.4, or 192 kHz |
| Aux Output Word Length | 16 or 24 bits |
| Impedance |
110 O XLR
75 O BNC |
| Level |
4 Vpp into 100 O XLR
1 Vpp into 75 O BNC |
| Transformer Coupled | Yes |
| DC Blocking Capacitors | Yes |
| Transient and Over-Voltage Protection | Yes |
Audio Performance
Fs = 44.1 to 192 kHz, 20 to 20 kHz BW, 1 kHz test tone, 0 dBFS = +24 dBu (unless noted)
| SNR - A-Weighted, 0 dBFS = +8 to +29 dBu | 121 dB |
| SNR - Unweighted, 0 dBFS = +8 to +29 dBu | 119 dB |
| SNR - A-Weighted at max gain, 0 dBFS = -14 dBu | 108 dB |
| THD+N, 1 kHz at -1 dBFS | -102 dBFS, -101 dB, 0.00089% |
| THD+N, 1 kHz at -3 dBFS | -107 dBFS, -104 dB, 0.00063% |
| THD+N, 20 to 20 kHz test tone at -3 dBFS | -106 dBFS, -103 dB, 0.00071% |
| Frequency Response at 192 kHz Sample Rate |
-3 dB, +0 dB, 2 Hz to 92 kHz
+/- 0.01 dB, 20 Hz to 20 kHz -0.06 dB at 10 Hz -0.01 dB at 20 Hz -0.00 dB at 20 kHz -0.18 dB at 88 kHz -3 dB at 92 kHz -100 dB at 108 kHz |
| Frequency Response at 96 kHz Sample Rate |
-3 dB, +0 dB, 1 Hz to 46 kHz
+/- 0.01 dB, 20 Hz to 20 kHz -0.06 dB at 10 Hz -0.01 dB at 20 Hz -0.00 dB at 20 kHz -0.10 dB at 44 kHz -3 dB at 46 kHz -108 dB at 54 kHz |
| Frequency Response at 48 kHz Sample Rate |
3 dB, +0 dB, 1 Hz to 23 kHz
+/- 0.01 dB, 20 Hz to 20 kHz -0.06 dB at 10 Hz -0.01 dB at 20 Hz -0.00 dB at 20 kHz -0.10 dB at 22 kHz -3 dB at 23 kHz -110 dB at 27 kHz |
| Passband Ripple | +/- 0.008 dB |
| Crosstalk |
-105 dB at 20 kHz
-130 dB at 1 kHz -130 dB at 1 kHz -200 dB at 20 Hz |
|
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 |
| Maximum Amplitude of Jitter Induced Sidebands |
< -134 dB with
10 kHz 0 dBFS test tone 12.75 UI sinusoidal jitter at 1 kHz (measurement limit) |
| Maximum Amplitude of Spurious Tones with 0 dBFS test signal | -130 dBFS |
| Maximum Amplitude of Idle Tones | -145 dBFS |
| Maximum Amplitude of AC line related Hum & Noise | -130 dBFS |
|
Interchannel Differential Phase (Stereo Pair) |
+/- 0.5 degrees at 20 kHz |
|
Interchannel Differential Phase (Between ADC1 Units) |
+/- 0.5 degrees at 20 kHz |
| Maximum Lock Time after Fs change |
< 1 s for frequency lock
< 5 s for phase lock |
| Mute on Sample Rate Change | Yes |
| Mute on Loss of External Clock | No |
| Mute on Lock Error | No |
| Mute on Receive Error | No |
| Soft Mute Ramp Up/Down Time | 10 ms |
Group Delay (Latency)
| Delay (Analog Input to Digital Output) |
1.20 ms at 44.1 kHz
1.09 ms at 48 kHz 0.75 ms at 88.2 kHz 0.67 ms at 96 kHz 0.63 ms at 176.4 kHz 0.59 ms at 192 kHz |
LED Status Indicators
| LED Location | Front Panel |
| Mode Indicators | 9 green |
| Meter | 14 green, 2 yellow, 2 red |
AC Power Requirements
| 14 green, 2 yellow, 2 red |
110 V setting - 95 V min 140 V max
220 V setting - 190 V min, 285 V max |
| Frequency | 50-60 Hz |
| Power |
16 Watts Idle
16 Watts Typical Program 20 Watts Maximum |
| Fuses |
5 x 20 mm (2 required)
110 V setting - 0.5 A 250 V Slo-Blo® Type 220 V setting - 0.5 A 250 V Slo-Blo® Type |
Dimentions
| Form Factor | 1/2 Rack Wide, 1 RU High |
| Depth behind front panel | 8.5" (216 mm) |
|
Overall depth including connectors without power cord or BNC-to-RCA adapter |
9.33" (237 mm) |
| Width | 9.5" (249 mm) |
| Height | 1.725" (44.5 mm) |
Weight
| ADC1 only | 3.6 lb. |
| ADC1 with power cord, 3 BNC-to-RCA adapters, extra fuses, and manual | 4.9 lb. |
| Rack mount kit (blank panel, junction block, and rack-mount screws) | 0.32 lb. |
| Shipping weight | 7 lb. |


















