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Instruction Manual for DAC2 HGC and DAC2 L with

2.X Firmware

Page 23

Outputs

Analog Outputs

The DAC2 has one pair of balanced XLR

outputs and two pairs of unbalanced RCA

outputs.

The DAC2 features high-current output

drivers that are capable of driving 300-Ohm

loads without an increase in distortion. They

are also well suited for driving long cables or

high-capacitance loads.

Balanced XLR Analog Line Outputs

The Left and Right balanced outputs use

Neutrik™ gold-pin male XLR jacks. The XLR

shell and pin 1 (ground) are both directly

bonded to the chassis to prevent currents in

the internal ground system. This direct

bonding also maximizes RF shielding.

The XLR outputs have passive attenuators

that allow direct connections to a wide variety

of audio devices without a loss of dynamic

range. The 10 or 20 dB pads are usually

required for direct interfacing to power

amplifiers and powered speakers. The DAC2

ships with the pads disabled (0 dB setting).

Use the 0 dB setting with the Benchmark

AHB2 power amplifier. A full description of

the output attenuators and instructions for

configuration is located in the Internal

Settings section of this manual.

Industry-Standard XLR Wiring

•

XLR pin 2 = + Audio Out

•

XLR pin 3 = - Audio Out

•

XLR pin 1 = Cable Shield

Caution:

If the balanced XLR outputs are

wired to an unbalanced input (using a special

adapter cable), pin 3 must be left floating.

Shorting pin 3 to ground will increase the

temperature of the output drivers, will

increase power consumption, and may cause

distortion.

Unbalanced RCA Analog Outputs

The Left and Right unbalanced outputs use

female RCA jacks. The ground connections

are bonded to chassis ground at the location

where analog ground is bonded to the

chassis. This minimizes the effects of ground

loops caused by AC currents in the cable

shield. The RCA output impedance is very low

(30 Ohms). This makes these outputs well

suited for driving high-capacitance loads

and/or high-capacitance cables.

Caution:

Mono summing with an RCA ‘Y’

cable is not recommended as this will cause

high amounts of distortion. Mono summing

with a ‘Y’ cable can be accomplished with the

use of a modified cable by implementing a 1k

Ohm series resistor in each leg of the ‘Y’.

Note:

The XLR pads do not have any effect

on the level of the RCA outputs.

Содержание DAC2 HGC

Страница 1: ...Benchmark DAC2 HGC and DAC2 L Instruction Manual Reference Stereo Preamplifier PCM and DSD D A Converter Asynchronous USB Version 2 x Firmware Units Manufactured or Upgraded after 06 10 2016 ...

Страница 2: ...TAGE RANGE OF 125 373 VDC Power Cord CAUTION ALWAYS USE A GROUNDED POWER CORD THE PRODUCT IS EQUIPPED WITH A STANDARD IEC POWER ENTRY MODULE USE AN IEC POWER CORD THAT IS EQUIPPED WITH THE APPROPRIATE CONNECTOR FOR YOUR LOCATION CORDS ARE AVAILABLE FROM YOUR DEALER Modifications CAUTION DO NOT SUBSTITUTE PARTS OR MAKE ANY MODIFICATIONS WITHOUT THE WRITTEN APPROVAL OF BENCHMARK MEDIA SYSTEMS INC MO...

Страница 3: ...OUGH Function 28 Rack Mounting 29 Benchmark Rack Mount Tray 29 Benchmark Wide Blank Plate 29 Benchmark Technologies 30 DAC1 and DAC2 Family History 30 Hybrid Gain Control 31 Native DSD Conversion 31 Jitter Immune UltraLock2 31 High Headroom DSP 31 32 bit SABRE Conversion System 32 Diagnostic Displays 32 Bi Directional 12 Volt Trigger 32 Distributed Power Regulation 32 HPA2 Headphone Amplifier 32 D...

Страница 4: ...customizing headphone output gain for headphone sensitivities DAC2 HGC only 2 Headphone Output Jacks one output has option to automatically mute main outputs DAC2 HGC only 2 Coaxial Digital Inputs 24 bit 192 kHz PCM DSD DoP 1 1 2 Optical Digital Inputs 24 bit 96 kHz PCM 1 Coaxial Digital Output digital pass through from USB Coax and optical inputs when jumpered 2 Stereo Analog Inputs 2 pairs unbal...

Страница 5: ...st possible transparency System Overview The DAC2 adds these features that are not found on the DAC1 Asynchronous 192kHz USB Audio 2 0 32 bit D A conversion system Word Length Display Sample Rate Display Polarity Control Direct DSD D A Conversion 20 dB DIM Bi Directional 12V Trigger Power Switch with Auto On Function Home Theater Bypass Digital Pass Through High Headroom DSP Dual Domain Hybrid Gai...

Страница 6: ...nchronous USB Audio 2 0 The USB Audio 2 0 interface supports DSD and 192 kHz 24 bit PCM No drivers are required for Apple operating systems Drivers are provided for Windows operating systems at http benchmarkmedia com dac dac2 drivers Native Asynchronous USB 1 1 The DAC2 has a driverless USB Audio 1 1 mode that supports 96 kHz 24 bit PCM with all operating systems This mode provides a quick and ea...

Страница 7: ...ers report that polarity is incorrect on some recordings and that they enjoy an improved listening experience when this is corrected To toggle use the POLARITY button on the front panel or press and hold the ON button on the remote HT Mode The HT mode sets the volume control to a calibrated level that is near its maximum setting In HT mode the analog gain is set to 0 dB unity gain Likewise the dig...

Страница 8: ...Instruction Manual for DAC2 HGC and DAC2 L with 2 X Firmware Page 8 Front Panel DAC2 HGC DAC2 L Rear Panel DAC2 HGC and DAC2 L ...

Страница 9: ... devices slaved to the 12V TRIGGER will also turn off in a controlled sequence Press and hold the OFF button for 3 seconds to force the 12V TRIGGER off only necessary when another device is acting as a TRIGGER BUS MASTER ON Turns the unit on Any devices slaved to the 12V TRIGGER will also turn on in a controlled sequence Press and hold the ON button for 3 seconds to toggle the POLARITY function VO...

Страница 10: ...Press and hold the POWER button for 3 seconds to force the 12V TRIGGER off only necessary when another device is acting as a TRIGGER BUS MASTER Starting with the unit off press and hold the POWER button for 3 seconds to set the AUTO ON function Starting with the unit on press and hold the POWER button for 3 seconds to clear the AUTO ON function If AUTO ON is set the POWER button will toggle MUTE o...

Страница 11: ... coaxial input D4 is selected and operating normally A blinking blue light indicates that the input is selected but audio data is not being received Note D4 cannot be selected if the Digital Pass Through function is enabled Instructions for configuring this jumper selected function can be found in the Internal Settings section of this manual Input Error Codes The input indicators flash when errors...

Страница 12: ...ted digital input The DAC2 detects active data bits and displays the results as follows 16 Only Measured input word length is 16 bits 16 and 24 Measured input word length is 17 to 23 bits 24 Only Measured input word length is 24 bits Both Off Measured input word length is less than 16 bits Format indicators The 44 48 2X 4X and DSD lights indicate the sample rate and format of the selected digital ...

Страница 13: ... or similar voltage sensitivities HPA2TM Headphone Power Amplifier The headphone jacks are driven by Benchmark s HPA2 headphone power amplifier This small and very clean power amplifier can deliver the current and voltage required by some of the most demanding headphones The output impedance of the HPA2 is very close to 0 Ohms This low output impedance delivers a high damping factor so that the am...

Страница 14: ...f the volume is adjusted while DIM is active it will not change the NORMAL setting unless the DIM volume is turned up above the last NORMAL setting If the volume control is turned up by more than 20 dB after DIM is activated the DIM mode will automatically deactivate the DIM light will turn off and the saved NORMAL setting will be replaced by the current volume setting DIM cannot be activated when...

Страница 15: ...The 12V TRIGGER I O can be connected to the trigger input or output ports on a preamplifier power amplifier or both The DAC2 can send a 12 Volt DC trigger signal to start other components in the system or it can wake up in response to an externally generated trigger signal The DAC2 automatically configures its trigger I O port as an input slave or output master Trigger Output DAC2 is Master When t...

Страница 16: ...connected to the bus can turn the entire system on or off Because of the bi directional design any power button on a Benchmark DAC2 or AHB2 can be used to start or stop the system The Benchmark device that starts the system will become the trigger master If the trigger master is turned off all slave devices will follow If a slave device is turned off all other devices will stay on If the DAC2 is u...

Страница 17: ...disable the computer volume control or set it to maximum Example 2 One of the analog inputs on the DAC2 is fed from a preamplifier with an analog volume control that you wish to use Set this analog input to HT mode on HT Mode Home Theater Bypass The home theater bypass is useful when you have a home theater system that will also be used for playing stereo recordings The DAC2 will directly drive th...

Страница 18: ...tor This direct connection provides the cleanest and shortest path from the digital source to the monitor output Tip Benchmark does not recommend placing audio devices between the DAC2 and the power amplifier unless these devices are providing an indispensible system function A direct connection between the DAC2 and the power amplifier will always provide the best system level performance SNR and ...

Страница 19: ...one drivers This damping reduces distortion while maintaining precise control of the frequency response at the output of the amplifier Digital Pass Through The second coaxial input D4 can be reconfigured as a digital output When operating as an output any selected digital input is passed through to D4 without any processing Optical coaxial and USB inputs U D1 D2 and D3 can be passed through to the...

Страница 20: ...imum word length is 24 bits Maximum sample rate is 192kHz The digital inputs also support DSD stereo at a sample rate of 2 8224 MHz using DoP 1 1 encapsulation The USB input has two operating modes USB Audio 1 1 PCM up to 24 bits at 96 kHz USB Audio 2 0 PCM up to 24 bits at 192 kHz and DSD DoP 1 1 format Caution The optical inputs D1 and D2 are not recommended for DSD or for sample rates above 96 ...

Страница 21: ...equire the installation of a driver It allows a quick driverless connection to windows machines when playing sample rates of 96 kHz or less In this mode Windows machines can begin streaming audio within seconds after the DAC2 is connected for the first time No software or hardware configuration is usually required USB Audio 2 0 is required for DSD and for all PCM sample rates exceeding 96 kHz Wind...

Страница 22: ...s The IEC 609588 3 standard specifies a 75 Ohm 0 5 Vpp consumer format which is also known as S PDIF and is commonly used in hi fi equipment The coaxial inputs are designed to accept either type of signal 12V TRIGGER I O The Benchmark bi directional 12V TRIGGER is compatible with virtually all trigger systems The 12V TRIGGER I O connection on the DAC2 can be used as an input an output or both It i...

Страница 23: ...f the output attenuators and instructions for configuration is located in the Internal Settings section of this manual Industry Standard XLR Wiring XLR pin 2 Audio Out XLR pin 3 Audio Out XLR pin 1 Cable Shield Caution If the balanced XLR outputs are wired to an unbalanced input using a special adapter cable pin 3 must be left floating Shorting pin 3 to ground will increase the temperature of the ...

Страница 24: ...ompatible power cord is included with DAC2 converters IEC style power cords in country specific configurations are available in your locality Caution Always use a grounded power cord The DAC2 is equipped with a standard IEC power entry module Use an IEC power cord that is equipped with the appropriate connector for your location Cords are available from your dealer Fuses Caution For continued fire...

Страница 25: ...t XLR Output Pads The XLR outputs are equipped with low impedance passive pads that may be used to reduce the output levels while preserving the full dynamic range of the DAC2 The DAC2 ships with the pads disabled 0 dB setting Tip Use the 0 dB setting with Benchmark s AHB2 power amplifier When directly driving other power amplifiers or powered speakers start with the 10 dB pad setting If necessary...

Страница 26: ...6 of each header Figure 1 Attenuators set to 10 dB Headphone Switch Configuration DAC2 HGC only The left hand headphone jack is equipped with a switch that will mute the analog outputs when a headphone plug is inserted The right hand headphone jack does not have a mute switch In most cases it is convenient to have one jack that mutes the outputs and on that does not mute the outputs If your requir...

Страница 27: ...roper attenuator settings are important for maximizing the SNR of the headphone monitoring system With proper settings the full performance of the DAC2 can be delivered to the headphones for critical monitoring tasks or maximum musical enjoyment Tip When the headphone attenuation jumpers are set properly a normal listening level will be achieved at a VOLUME control setting above the 11 o clock pos...

Страница 28: ...tal audio output When the PASS THROUGH function is enabled D4 cannot be selected as an input Any other selected digital input will be routed to both the internal D A converter and to output D4 The digital output at D4 is buffered but is not processed Many digital audio formats can be passed through to D4 even when these formats cannot be decoded by the DAC2 By default D4 functions as a digital inp...

Страница 29: ...e available from Benchmark Benchmark Rack Mount Tray The Benchmark Rack Mount Tray mounts up to two wide Benchmark products in a single race space The tray accepts any combination of wide Benchmark products with or without rack mount type faceplates Benchmark Wide Blank Plate The Benchmark Wide Blank Plate is a wide 1 RU anodized aluminum panel for covering an unused slot in the Benchmark Rack Mou...

Страница 30: ...ut was the first USB audio interface to support 96 kHz audio without the need to install special drivers DAC1 PRE The DAC1 PRE added these improvements Three coaxial digital inputs Three Headphone Gain Ranges LM4562 LME49860 opamps throughout Premium bulkhead mounted RCA connectors The DAC1 PRE eliminated the XLR digital input found on the DAC1 and DAC1 USB DAC1 HDR The DAC1 HDR added these improv...

Страница 31: ...beyond the end of its range it will not damage the motor Also if the pot is manually overridden it will not damage the motor Native DSD Conversion The digital coaxial inputs and the USB Audio 2 0 input on the DAC2 support native DSD conversion DoP 1 1 DSD encapsulation is automatically detected on all digital inputs The system seamlessly switches to native DSD conversion when DoP is detected DoP 1...

Страница 32: ...sk player media player and computer Bi Directional 12 Volt Trigger Benchmark has re invented the 12 volt trigger The trigger connection on the DAC2 can be used as an input or output or both and is compatible with any common 12 volt trigger input or output The trigger can be used to turn a power amplifier on or off automatically The DAC2 will also respond to a 12 volt trigger and follow the actions...

Страница 33: ... cause audible distortion while escaping the scrutiny of an audio analyzer The balanced and unbalanced outputs on the DAC2 deliver very similar performance Many D A converters omit the differential amplifiers after the converters Specifications usually ignore common mode distortion A balanced signal with high common mode distortion can measure just fine when feeding a precisely balanced input on a...

Страница 34: ...ck from the digital audio interface clock Jitter on a D A digital audio input or an A D reference input can never have any measurable effect on the conversion clock of an UltraLock2 converter In an UltraLock2 converter the conversion clock is never phase locked to a reference clock Instead the converter oversampling ratio is varied with extremely high precision to achieve the proper phase relation...

Страница 35: ...ion can be measured very easily by sweeping a test tone between 24 kHz and at least 200 kHz while monitoring the output of the converter Put UltraLock converters to the test We encourage our customers to perform the above tests on UltraLock2 converters or let your ears be the judge There will be absolutely no change in performance as jitter is added to any digital input on an UltraLock2 converter ...

Страница 36: ...m This second asynchronous transfer eliminates any traces of jitter that accumulate as the data is transferred between the USB and conversion subsystems No traces of jitter induced distortion are measurable to our measurement limits better than 140 dBFS This truly represents the state of the art Enjoy the convenience of computer playback without compromise The Asynchronous USB system supports USB ...

Страница 37: ... Page 37 USB Driver Installation Windows Operating Systems Note The DAC2 driver is available for download at BenchmarkMedia com dac dac2 drivers Before you install the driver make sure the USB cable is unplugged 1 In the DAC2 Driver folder double click setup exe ...

Страница 38: ...til the USB Audio 2 0 mode has been enabled You can enable the USB Audio 2 0 mode using one of the following two methods METHOD 1 REMOTE CONTROL Using your remote control press and hold USB button for 3 seconds the 4X light should flash once If the 2X light flashes instead of the 4X light repeat this step METHOD 1 FRONT PANEL From the front panel simultaneously press and hold both INPUT buttons fo...

Страница 39: ... driver It will default to your Program Files folder If you wish to install it another location you can change the location We suggest keeping it in the default location Click Install 5 When the installation begins you will see the following screen Please be patient while the driver installs Installation may require several minutes ...

Страница 40: ...shes a message at the top will say Installation Complete Click Next to continue 7 Click Finish The Setup will close automatically This completes the installation process You can now enjoy music over the USB Audio 2 0 connection at sample rates up to 192 kHz DSD can also be played in DoP 1 1 format ...

Страница 41: ...Hz is normal in an FFT analysis and is not an indication of noise This 32k point FFT analysis uses a Blackman Harris window with 16x power averaging and spans a frequency range of DC to 32 kHz Audio Precision FFT Idle Channel Noise 0 dBr 0 dBFS 23 dBu DAC2 FFT Idle Channel Noise at27 Color Sweep Trace Line Style Thick Data Axis Comment 1 1 Green Solid 4 Fft Ch 1 Ampl Left 1 2 Red Solid 4 Fft Ch 2 ...

Страница 42: ...tely no sign of any AC hum Audio Precision FFT Idle Channel Noise Low Frequency 0 dBr 0 dBFS 23 dBu DAC2 FFT Idle Channel Noise Low Frequency at27 Color Sweep Trace Line Style Thick Data Axis Comment Cursor1 Cursor2 1 1 Green Solid 4 Fft Ch 1 Ampl Left 156 413 dBr 157 539 dBr 1 2 Red Solid 4 Fft Ch 2 Ampl Right 159 813 dBr A 158 700 dBr A 160 0 140 120 100 80 60 40 20 d B r A 160 0 140 120 100 80 ...

Страница 43: ...kHz Please note that these are almost exactly the same harmonic distortion levels that occur with a 1 kHz tone see Graph 4 FFT 1 kHz This demonstrates that the DAC2 analog stages have the high slew rates required to pass high amplitude high frequency signals without an increase in harmonic distortion The rise at 0 Hz is normal in an FFT analysis and is not an indication of noise This 32k point FFT...

Страница 44: ...is uses a Blackman Harris window with 16x power averaging and spans a frequency range of DC to 32 kHz Audio Precision DAC2 FFT 1 kHz 0 dBr 0 dBFS 23 dBu DAC2 FFT 1 kHz at27 Color Sweep Trace Line Style Thick Data Axis Comment Cursor1 Cursor2 1 1 Green Solid 4 Fft Ch 1 Ampl Left 115 268 dBr 128 290 dBr 1 2 Red Solid 4 Fft Ch 2 Ampl Right 115 954 dBr A 130 429 dBr A 160 0 140 120 100 80 60 40 20 d B...

Страница 45: ...kHz Audio Precision 10 24 12 16 02 03 DAC2 FREQUENCY RESPONSE Fs 96 kHz DAC2 Frequency Response at27 Color Sweep Trace Line Style Thick Data Axis Comment Cursor1 Cursor2 1 1 Green Solid 4 Anlr Level A Left 0 011 dBr A 0 026 dBr A 1 2 Red Solid 4 Anlr Level B Right 0 009 dBr 0 020 dBr 10 1 9 8 7 6 5 4 3 2 1 0 0 009 0 02 d B r B 10 1 9 8 7 6 5 4 3 2 1 0 d B r A 5k 45k 10k 15k 20k 25k 30k 35k 40k 10 ...

Страница 46: ...e inputs The two traces must be averaged to remove the phase errors of the AP test set DAC2 converters are phase accurate between boxes Three DAC2 converters can be used as a group to form a phase accurate 5 1 surround system Four DAC2 converters can be combined to form a 7 1 system The phase accuracy between any two channels will match the phase accuracy shown above Audio Precision DAC2 Different...

Страница 47: ... remove common mode distortion components This is important because common mode distortion is not detected when measuring with the precisely balanced inputs on the AP 2700 test set The THD N measurements on the unbalanced outputs confirm the effectiveness of the differential amplifiers Similar results are obtained by measuring either side of the balanced outputs relative to ground Audio Precision ...

Страница 48: ... unbalanced outputs the ability to approach the performance of the balanced outputs Please note that the differential amplifiers also eliminate common mode distortion on the balanced outputs Audio Precision DAC2 THD N vs AMPLITUDE AT 1 KHZ w 20 kHz LPF unweighted Unbalanced Outputs Relative to 0 dBFS 0 dBFS 7 2 dBu DAC2 Unbalanced THD N_VS_AMPLITUDE at27 Color Sweep Trace Line Style Thick Data Axi...

Страница 49: ...A2 has a near 0 Ohm output impedance which provides outstanding control and damping of the headphone drivers The HPA2 has the voltage and current drive necessary to drive a wide variety of headphones Audio Precision DAC2 THD N vs AMPLITUDE AT 1 KHZ w 20 kHz LPF unweighted Headphone Outputs Relative to 0 dBFS 0 dBFS 7 2 dBu DAC2 HEADPHONE THD N_VS_AMPLITUDE at27 Color Sweep Trace Line Style Thick D...

Страница 50: ...f maintaining low THD levels at high frequencies even when driven to 0 dBFS Note that there is almost no rise in THD N with frequency even when operating at maximum output levels Audio Precision DAC2 THD N VS FREQ AT 0 dBFS w 80 kHz LPF unweighted Balanced Outputs DAC2 THD N vs FREQUENCY 80kHZ at27 110 90 107 5 105 102 5 100 97 5 95 92 5 d B 20 20k 50 100 200 500 1k 2k 5k 10k Hz ...

Страница 51: ...12 dB to 120 dB and should be entirely inaudible Audio Precision DAC2 THD VS FREQ AT 0 dBFS Balanced Outputs DAC2 EVEN AND ODD THD vs FREQUENCY at27 Color Sweep Trace Line Style Thick Data Axis Comment Cursor1 Cursor2 1 1 Green Solid 4 Distortion Ch 1 Harm Sum1 Ratio Left 115 210 dB 112 066 dB 1 2 Red Solid 4 Distortion Ch 1 Harm Sum2 Ratio Right 115 165 dB 120 544 dB GREEN EVEN HARMONIC DISTORTIO...

Страница 52: ...istortion Ch 1 Harm Sum1 Ratio Left 1 00000 Swr Ch A B Input 112 557 dB 1 3 Cyan Solid 4 Distortion Ch 2 Harm Sum1 Ratio Right 1 00000 Swr Ch A B Input 112 453 dB 2 2 Red Solid 4 Distortion Ch 1 Harm Sum1 Ratio Left 3 00000 Swr Ch A B Input 113 919 dB 2 3 Magenta Solid 4 Distortion Ch 2 Harm Sum1 Ratio Right 3 00000 Swr Ch A B Input 113 349 dB 3 2 Green Solid 4 Distortion Ch 1 Harm Sum1 Ratio Left...

Страница 53: ...mark Media Systems Inc DAC2 THD N vs Sample Rate 1 kHz at 0 dBFS w 20 kHz LPF unweighted Balanced Outputs DAC2 THD N vs Sample Rate at27 Color Sweep Trace Line Style Thick Data Axis Comment 1 1 Green Solid 4 Anlr THD N Ratio Left 1 2 Red Solid 4 Anlr THD N Ratio Left 120 90 117 5 115 112 5 110 107 5 105 102 5 100 97 5 95 92 5 d B 40k 200k 60k 80k 100k 120k 140k 160k 180k Hz ...

Страница 54: ...er tolerance test the THD N performance of the DAC2 is unchanged The DAC2 easily passes the AES jitter tolerance test without any THD N performance degradation Audio Precision DAC2 INTERFACE JITTER TOLERANCE Distortion vs Jitter 3 456 kHz Test Tone at 0 dBFS THD N 22 to 22 kHz BW DAC2 JITTER TOLERANCE at27 Color Sweep Trace Line Style Thick Data Axis Comment 1 1 Green Solid 4 Anlr THD N Ratio Left...

Страница 55: ...z Dio Jitter Freq 9 2 Red Solid 1 Fft Ch 1 Ampl Left 630 957 Hz Dio Jitter Freq 10 2 Magenta Solid 1 Fft Ch 1 Ampl Left 794 328 Hz Dio Jitter Freq 11 2 Blue Solid 1 Fft Ch 1 Ampl Left 1 00000 kHz Dio Jitter Freq 12 2 Cyan Solid 1 Fft Ch 1 Ampl Left 1 25893 kHz Dio Jitter Freq 13 2 Green Solid 1 Fft Ch 1 Ampl Left 1 58489 kHz Dio Jitter Freq 14 2 Yellow Solid 1 Fft Ch 1 Ampl Left 1 99526 kHz Dio Ji...

Страница 56: ...the 10 kHz and 13 kHz products measure about 128 dB IMD distortion should be well below audible levels Audio Precision 11 06 12 08 15 12 DAC2 11K 12K IMD DAC2 IMD 11K 12K at27 160 0 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 d B r A 160 0 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 122 154 128 885 d B r A 0 20k 2k 4k 6k 8k 10k 12k 14k 16k 18k 1 01761k 10 0196k Hz dx 9 00196 kHz dy 6...

Страница 57: ... to 20 kHz 0 04 dB at 10 Hz 0 04 dB at 20 kHz Crosstalk 116 dB at 20 kHz 130 dB at 1 kHz 137 dB at 20 Hz Maximum Amplitude of Jitter Induced Sidebands 10 kHz 0 dBFS test tone 12 75 UI sinusoidal jitter at 1 kHz 144 dB Maximum Amplitude of Spurious Tones with 0 dBFS test signal 138 dB Maximum Amplitude of Idle Tones 147 dB Maximum Amplitude of AC line related Hum Noise 140 dB Inter channel Differen...

Страница 58: ... kHz Coaxial Inputs 28 to 96 kHz Optical Inputs 44 1 48 88 2 96 176 4 192 kHz USB Input Maximum Input Word Length 24 bits Digital Input Impedance 75 Ohms Coaxial Inputs DC Blocking Capacitors on Digital Inputs Yes Coaxial Inputs Transient and Over Voltage Protection on Digital Inputs Yes Coaxial Inputs Minimum Digital Input Level 250 mVpp Coaxial Inputs Jitter Tolerance With no Measurable Change i...

Страница 59: ...ced Analog Outputs Number of Unbalanced Analog Outputs 4 Output Connector RCA Output Impedance 30 Ohms Analog Output Clip Point 13 5 dBu 3 7 Vrms Factory Set Home Theater Bypass Output Level at 0 dBFS 8 2 dBu 2 Vrms Output Level Range at 0 dBFS Off to 8 2 dBu 2 Vrms Output Level Variation with Sample Rate 44 1 kHz vs 96 kHz 0 006 dB HPA2TM Headphone Outputs Number of Headphone Outputs 2 Output Con...

Страница 60: ...Typical Program 15 Watts Maximum Fuses 5 x 20 mm 2 required 0 5 A 250 V Slo Blo Type Min Max Operating range VAC RMS 90 260 47 63Hz Dimensions Form Factor Rack Wide 1 RU High Depth behind front panel 8 5 216 mm Overall depth including connectors but without power cord 9 33 237 mm Width 9 5 249 mm Height 1 725 44 5 mm Weight DAC2 only 3 lb DAC2 with accessories and manual 4 lb Shipping weight 7 lb ...

Страница 61: ...interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate receivin...

Страница 62: ...Instruction Manual for DAC2 HGC and DAC2 L with 2 X Firmware Page 62 CE Certificates of Conformity ...

Страница 63: ...n lieu of repair If the failure has been caused by misuse neglect accident or abnormal operating conditions repairs will be billed at the normal shop rate In such cases an estimate will be submitted before work is started if requested by the customer Attempts to deliberately deface mutilate or remove the product s label will render this warranty void Benchmark will not honor warranties for any pro...

Страница 64: ...anty Benchmark Media Systems Inc optionally extends the standard 1 year warranty to a period of two years from the date of delivery For the extended warranty to become effective the original purchaser must register the product at the time of purchase either by way of the enclosed registration card or through the product registration section of the Benchmark Media Systems Inc website This optional ...

Страница 65: ... Copyright 2007 2008 2009 2012 2013 2014 2015 2016 Benchmark Media Systems Inc All rights reserved Benchmark Media Systems Inc Benchmark Media Systems Inc 203 East Hampton Place STE 2 Syracuse NY 13206 1633 USA PHONE 1 315 437 6300 FAX 1 315 437 8119 benchmarkmedia com ...

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