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Bryston B-60 SST, Брошюра и характеристики

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I3

BRYSToN  

DIGITAL TO ANALOGUE CONVERTER

BRYSTON DAC

The Bryston DAC chip we use is a hybrid multi-bit delta sigma 
DAC (digital to analogue converter) device. Before the digital 
data reaches the delta-sigma modulator, it is run through an 8x 
over-sampling process and digital interpolation filter. Due to 
the inherent over-sampling process of a delta- sigma modulator 
architecture, the overall interpolation ratio of the device is 128 
times. Over-sampling and up-sampling have some great benefits 
when implemented correctly.
There is a significant difference between up-sampling and 
oversampling. Over-sampling is when the samples are repeated 
(2x, 4x, 8x, etc.) to create a new sampling frequency. The new 
samples are then generally run through an interpolation filter 
to create a more analog-like waveform.
Up-sampling usually refers to a mathematical process in which 
the new sample rate is not a multiple of the old sample rate, 
and the numbers have to be calculated in real-time. This is 
what is happening when a sample rate converter chip is in an 
up-convert mode. So in the BP-26 DA, if a 44.1 kHz signal 
is present: we up-sample to 96kHz (with the Sample Rate 
Converter) and then the DAC will internally 8x over-sample 
that signal. The great benefit of both of these methods is that 
it relaxes the requirements of the analog filter after the DAC.  

This is important because it allows designers to implement 
higher cutoff frequencies with slower roll-offs, which results 
in a phase linear circuit in the audio band.
The up-sampling method, when implemented correctly, also 
has the side effect of jitter reduction, since the output clock is 
usually asynchronous from the input clock. Another thing to 
note is that if the over-sampling or up-sampling processes are 
implemented poorly, they can actually introduce jitter. This is 
usually a result of poor power supply implementation.
So, in the Bryston DAC, each stage in the digital chain (input 
receiver > sample rate converter > digital audio converter) is 
independently regulated to prevent any interactions and to 
provide rock solid power supplies for any up-sampling/over-
sampling process. 
All of this being said the most critical part of the DAC circuit 
in the Bryston Preamplifiers and Bryston Integrated Amplifiers 
is that the output from the D to A is directly connected to 
a pair of Bryston proprietary Class A Discrete Operational 
Amplifiers rather than the typical IC chips employed in most 
other products. This makes a huge difference in resolution and 
dynamic headroom performance. 

Содержание B-60 SST

Страница 1: ...C SERIES PRE AMPLIFIERS INTEGRATED AMPLIFIERS PHONO STAGE DAC BP26 MPS 2 ...

Страница 2: ...EMOTE CONTROL FEATURE The BP 26 includes a remote control with motor driven volume up down along with mute and absolute phase reversal buttons Volume mute and absolute phase can also be activated manually on the front of the preamplifier if the need arises DAC OPTION The new BP 26DA preamplifier provides a digital interface using premium quality digital to analogue converters on 2 switchable stere...

Страница 3: ...ifier with volume remote control BP 26P Line level preamplifier with MM phono stage and volume remote control BP 26MC Line level preamplifier with MC MM phono stage and volume remote control BP 26DA Line level preamplifier with 2 DAC inputs and volume remote control Our feeling is that Bryston s BP 26 C Series preamplifiers are one of those fortunate circumstances when the long hours and extended ...

Страница 4: ... kg each BP 26 DA Specifications Input Sample Rate 16kHz to 108kHz Word Length 16 18 20 24 Bit Conforms to SPDIF standard Distortion Less than 002 20Hz 20kHz Signal to Noise Ratio Greater than 100dB Frequency Response 20Hz 20kHz 1dB BP 26 Phono Specifications Distortion Less than 005 IM or THD any frequency or combination of frequencies from 20 20kHz at rated output or below Rated Noise Phono 80dB...

Страница 5: ... analog mode It offers many advantages for instance perfect channel balance a simple integrated balance adjustment without additional parts practically zero adjustment noises first class behavior in reference to noise and distortion as well as adjustment via software Other Advantages Include RS 232 Software Control Upgradeable IR Control New C Series cosmetics Fully Discrete Analog Circuitry Relay...

Страница 6: ...e balance between the left and right channels Low output impedance and high current availability allow you to run long cables between the preamp and power amp without any loss of frequency response so you can position your amp as close to your speakers as possible The BP 6 is also available with an optional internal MM Phono Stage BP 6P input or our now famous Digital DAC input BP 6 DA if required...

Страница 7: ...fier with MM Phono Stage B 100DA Integrated Amplifier with 4 Digital inputs B 100P DA Integrated Amplifier with MM Phono and 4 Digital Inputs DESIGN PHILOSOPHY ENSURES SONIC SUPERIORITY All signal circuitry is fully discrete to avoid the compromises phase shift and nonlinearities inherent in IC s Two completely separate and independent custom torodial power supplies are employed to prevent any pos...

Страница 8: ... Programmable Pass through feature Main In Pre Out jacks New Volume Control Optional Full Function Remote Assignable Digital inputs DA version only R232 Software Upgradable IR Control Headphone Jack Two Optical and Two SPDIF inputs DA version only Optional Internal D to A Converter Optional Internal Phono Stage Available in Black or Silver 17 or 19 inch faceplate PERFORMANCE WITHOUT COMPROMISE If ...

Страница 9: ...armonic Distortion Less than 0 02 from 20Hz to 20kHz at 60 watts IM Distortion Less than 0 01 from 10 milliwatts to 60 watts Noise 106dB below full output Slewing Rate Greater than 60 volts per microsecond Power Bandwidth 5Hz to over 100kHz Damping Factor Over 500 at 20Hz ref 8 ohms Input Sensitivity 775 Volt in for full output 50k input impedance Features Independent analog and digital power supp...

Страница 10: ...olystyrene capacitors and hand selected and matched transistors 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 more typically utilized in military and aerospace industries Our traditional adherence to proprietary parts and sophisticated construction and testing techniques g...

Страница 11: ...r channel 4 ohms Harmonic Distortion Less than 0 01 from 20Hz to 20kHz at 60 watts IM Distortion Less than 0 01 from 10 milliwatts to 60 watts Noise 106dB below full output Slewing Rate Greater than 60 volts per microsecond Power Bandwidth 5Hz to over 100kHz Damping Factor Over 500 at 20Hz ref 8 ohms Input Sensitivity 775 Volt in for full output 50k input impedance Features Each channel employs co...

Страница 12: ...ed with an inside jumper to 41dB gain The Moving Coil mode adds an additional gain stage to the MM stage with a step up transformer This step up transformer has adjustments for gain as well It can be set for 22 5dB or 16 5dB of gain It is factory set for 22 5dB as this will facilitate 90 of the MC cartridges available The standard gain of 22 5dB accommodates cartridges with outputs of less than 40...

Страница 13: ...vity MM mode 5 mV MC mode 500uV Distortion 005 IM or THD any frequency or combination of frequencies from 20Hz 20kHz at rated output Rated noise with A Weighting filter MM mode 80 dBA referred to an input of 5 mV RMS 1kHz MC mode 80 dBA referred to an input of 0 5 Gain MM mode 35 dB or 41 dB internally changeable Factory set gain 35dB MC mode 51 5 dB 57 5 dB or 63 5 dB internally changeable Factor...

Страница 14: ...ter and then the DAC will internally 8x over sample that signal The great benefit of both of these methods is that it relaxes the requirements of the analog filter after the DAC This is important because it allows designers to implement higher cutoff frequencies with slower roll offs which results in a phase linear circuit in the audio band The up sampling method when implemented correctly also ha...

Страница 15: ...led but not both BP 16 BP 16 can have both Phono MM and DAC internally installed BP 6 BP 6 can have Phono MM or DAC internally installed but not both B 100 BP 100 can have both Phono MM and DAC internally installed B 60R B 60R can have Phono MM or DAC internally installed but not both BP 1 5 COMPARISON CHART I4 ...

Страница 16: ...achines as many companies do But that would mean exposing the entire circuit board to a molten metal bath a source of extreme heat shock that could result in long term reliability problems We don t skimp on testing or rush our products through some last minute go no go check at every stage individual parts completed circuit boards sub assemblies and final assembliesareallputthroughrigorousinspecti...

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