The Bryston BDA-1 Digital to Analogue convertor is a state-of-the-art external Stereo DAC using fully discrete Class-A proprietary Bryston analogue circuits, two independent linear power supplies and dual Crystal CS-4398 DAC chips. The Bryston BDA-1 Digital to Analogue convertor features an impressive array of inputs for USB, COAX, OPTICAL; AES-EBU and BNC equipped digital devices. For audio outputs, the Bryston BDA 1 DAC offers both balanced XLR as well as unbalanced RCA stereo connectors on the rear panel. The BDA1 is RS-232 software upgradeable, making it the most flexible high performance DAC on the market.
The best way to understand the Bryston BDA 1 External DAC is to follow the flow of a signal from when it first arrives at the BDA-1 in digital form to when it leaves to drive an external analogue input. The digital signal first arrives at the Bryston BDA-1 Digital to Analogue convertor via either the SPDIF COAX, OPTICAL OR AES EBU inputs or the USB interface input. These are the standard digital outputs from a CD Drive, Sound Card, Computer, Music Server etc. There are 6 digital inputs, which are easily selected using a front panel switch. This digital signal contains data at over 1 million bits per second that requires a bandwidth of 5 to 10 million hertz (cycles per second). At these high frequencies, it is very important to maintain the quality of the signal by having the correct termination at the digital inputs. The BDA-1 provides for this termination in the best possible manner using devices called impedance matching transformers. Impedance matching transformers provide the optimal interface to the incoming source under all sorts of signal conditions. Lesser quality terminations will degrade the signal, causing increased jitter
After the input stage, the signal goes to the SYNCHRONOUS up sampling circuit (sample rate converter). This circuit converts the digital signal from one sample rate and bit depth to another. In the Bryston BDA-1 Digital to Analogue convertor, the sample rate is increased from the input sample frequency (32K, 48K, or 96K up samples to 192K and 44.1K or 88.2K up samples to 176.4K). The 16 bits of depth (the CD standard) is increased to 24 bits. The added 8 bits are filled with placeholder information. This up sampling process provides a digital signal for later conversion to analogue by the Crystal 4398 DAC chip. The up sampling process doesn't add any new, but does put the data in a form which can better be translated by the DAC as described below. The advantage of this synchronous up sampling process is improved processing of the up sampled signal by the DAC chip, which was designed for higher sample rates and bit depths. There is also a noise shaping process implemented where "noise" within the audible spectrum is shifted up to frequencies above audible limits. An added advantage of this up sampling process is that a totally new clock signal is applied, which results in significant jitter reduction.
A very unique feature of the Bryston BDA1 External DAC is the ability to disengage the up sampling feature. You can compare an up sampled signal with a non-up sampled signal simply by engaging a switch on the front panel. This feature is functional when using sample rates of 44.1K, 88.2K, 48K, and 96K.
Bryston hand assembles and individually tests each and every product we manufacture. Bryston exclusively use only the finest components, 1% metal-film resistors, 0.1% polystyrene capacitors, and hand selected and matched transistors in order to reduce noise and distortion to the absolute minimum. Bryston applies techniques and employs custom materials in our everyday construction of electronic equipment that are typically utilized by military and aerospace industries. Our traditional adherence to the use of proprietary parts, sophisticated construction, and refined testing techniques guarantees that the Bryston BDA-1 DAC will perform superbly for many years.
Dual 192K/24Bit Crystal DAC's
Independent dual power supplies
Discrete Class A analogue
16-24Bit PCM, 16Bit 32K-48K USB
Fully differential balanced XLR and unbalanced RCA stereo outputs
Transformer-coupled SPDIF and AES EBU digital inputs
RS-232 software upgrade
Optional remote control
Remote 12-volt trigger
Compatible with CD drives, sound cards, computers, music servers
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