BDA-1 EXTERNAL DAC OWNER’S MANUAL
The Bryston BDA-1 is a State-of-the-Art external Stereo digital to analog converter using fully discrete analog class-A proprietary Bryston amplifier circuits.
BDA-1 FEATURES:
•Dual 192K/24Bit Crystal DAC’s (CS-4398’s)
•Separate analog and digital linear power supplies
•Discrete Class A analog output stage
•Over-sampling
•Synchronous up-sampling (176.4K/192K)
•Independent Analog and Digital signal paths
•Eight digital audio inputs:
•1x USB,
•4x SPDIF (co-axial wire)
•2x optical (TOSLINK)
•1x AES/EBU
•Sample rates: 32KHz, 44.1KHz, 48KHz, 88.2KHz, 96KHz, 176.4KHz, 192KHz
•16-24Bit PCM, 16Bit 32K-48K USB
•Fully Differential Balanced XLR and Unbalanced RCA Stereo outputs.
•Transformer coupled SPDIF and AES/EBU Digital inputs.
•SPDIF COAX Bypass Loop Output
•Software upgradable via RS232 port
•Optional Remote Control
•Remote 12 Volt On/Off Trigger
•Compatible with CD Drives, Sound Cards, Computers, Music
Servers.
•Cosmetically matches C-Series BP26, MPS2, BCD-1, etc
input selection:
The digital signal first arrives at the BDA-1 via either the SPDIF co-ax, TOSLINK optical, AES/EBU or USB input. These are the normal digital outputs from a CD Drive, Sound Card, Computer,
Music Server etc. One of these 8 inputs is selected by either the front panel push button switches or the infra-red remote control.
OPTIONAL BR2 REMOTE CONTROL:
The BR2 infra-red remote control offered for use with the BDA-1 is a multi-function remote capable of operating not only the BDA-1, but also the BCD-1 CD player and many Bryston preamps and integrated amplifiers such as the BP26, BP6, BP16, B60R and B100. For more information see the BR2 Owner’s Manual.
POWER CONSIDERATIONS:
In general, if your BDA-1 has a three prong grounded line cord you can reduce the possibility of local ground loops which could cause hum or noise in the system by plugging its line cord into the same wall outlet next to the power amp and other equipment in your system.
UNDER-VOLTAGE INDICATOR:
The BDA-1 contains an under-voltage detection circuit which will illuminate the red Up-Sample LED if the connected AC supply voltage is approximately 20% or more below nominal (e.g. <96vac for a 120vac unit, or <185vac for a 230vac unit). When such an under-voltage condition exists the BDA-1 will not power up and the only LED to be illuminated will be the red Up-Sample
LED.
FUSES & ELECTRICAL SAFETY:
The BDA-1 contains a single fuse located inside the unit. IF it should become necessary to replace this fuse we recommend that you seek the assistance of qualified service personnel. If you decide to change the fuse yourself we advise the following:
1st) |
Turn off the BDA-1 |
2nd) |
Disconnect ALL cables from the rear of the BDA- |
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1, especially the power cord. |
3rd) |
Remove the 10 screws securing the top cover to |
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remove the top cover panel |
4th) |
Locate the 5x20mm glass fuse on the CD1-PM |
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circuit board (near the IEC power inlet) of the |
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BDA-1. Replace a blown fuse only with the same |
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type and value of fuse. All fuses are rated 250V |
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For 100 volt models fuse value is F 250mA L |
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For 120 volt models fuse value is F 250mA L |
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For 230 volt models fuse value is F 125mA L |
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For 240 volt models fuse value is F 125mA L |
5th) |
Replace the top panel and all 10 screws and |
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reconnect all necessary cables |
FEATURES, CONTROLS & CONNECTIONS:
1:SAMPLE RATE LED Array: (2 columns X 4 rows).
Indicates the sample rate of the selected input and whether or not it is locked.
2:UP-SAMPLE: Engages up-sampling such that incoming sample rates of 32K, 48K or 96K sps will be up-sampled to 192K (LEDs ~ see above ~ light green), and 44.1K and 88.2K sps will be up-sampled to 176.4K (LEDs light red) to allow for
optimal DAC performance.
N.B. The Up-Sample LED may also be used to indicate an under-voltage situation wherein the AC supply voltage is approx. 20% or greater below nominal. See UNDERVOLTAGE INDICATOR section above.
3:OPTO INPUTS: There are two TOSLINK inputs for optical digital audio.
4:SPDIF INPUTS: There are four SPDIF inputs for coaxial cable connections. Two inputs have RCA (phono) connectors, and two have BNC connectors.
5:AES/EBU INPUT: There is one AES/EBU (Audio Engineering Society/European Broadcasting Union) fully balanced input using a 3 pin XLR female connector for a twisted pair wire connection of a digital audio signal.
6:USB input: There is a single USB, revision 1.1 compliant, input. When connecting to a PC it may be necessary to direct the digital audio stream from your computer through its USB port to the BDA-1. To do so, click on your PC’s START menu then select CONTROL PANEL > SOUNDS & AUDIO DEVICES > AUDIO and ensure that the Bryston BDA-1 is selected.
N.B. Put the BDA-1 in STANDBY before connecting or disconnecting a USB cable. DO NOT HOT SWAP!
7:POWER SWITCH ~ STANDBY LED INDICATOR:
When the LED above the power switch is lit red the unit is
BDA-1 FRONT PANEL:
on standby. If neither this LED nor any other LED on the front panel is illuminated then there is no power entering the unit or the internal fuse is blown. See also Remote Trigger section.
8:INPUT SIGNAL LED INDICATORS: There are 8 LEDs to indicated which input has been selected. The LED will light green when a PCM signal is present at the selected input, and red for any other signal present condition, including AC3 multi-channel signals.
9:ANALOG AUDIO OUTPUTS: The BDA-1 is supplied with one pair of gold plated RCA (phono) jacks for unbalanced (single-ended) outputs as well as one pair of fully balanced outputs on XLR male connectors. All connectors are gold plated and all output signals are fully buffered by Bryston’s discrete analog audio amplifier stages.
10:SPDIF OUTPUT: The signal present at the SPDIF output connector is the same signal that is selected as an input source. This signal is unaltered except for USB input signals.
11:REMOTE TRIGGER INPUT: The BDA-1 is supplied with a Trigger input put to facilitate remote hard wired on/off control. A two pin socket mates with the CO110A-11102 bare-wire terminal block connector supplied with your BDA-1 (see illustation below-left). Supplying a DC control voltage between 3 and 12 volts (at greater than or equal to approximately 3mA) will allow you to remotely power your BDA-1 on or off. The the Remote Trigger input takes precedence over the front panel push-button switch. If a valid control voltage is initially applied to the trigger input when the BDA-1 is already powered on it may be necessary to toggle the unit OFF-and-ON once, via the Trigger input, to establish the precedence of the trigger input signal over the front panel power switch.
BDA1 REAR PANEL:
12:DATA PLATE: This label provides the units exact model number, serial number, electrical rating and date of manufacture. Do not remove.
13:RS232 port. For uploading new software into the BDA-1.
Connects to an RS232 serial port on a computer capable of running a Windows executable program.
FIRMWARE UPDATES
BDA-1 firmware updates will periodically be available from Bryston dealers or from Bryston Ltd. directly. These firmware updates will be supplied as an executable file
(program) which, when executed on your PC, will search for available serial ports on your computer and then search for the BDA-1 before uploading and automatically installing the new firmware in your BDA-1.
1)If the BDA-1 is ON, place it in standby by pressing the POWER button either on the front panel or on the remote control. When the LED above the POWER button lights red, the BDA-1 is in standby.
2)Connect a suitable RS232 cable between your PC (sorry, but MAC’s are not supported at this time) and the BDA-1. In most cases (depending on your
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