What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

EISA 2012-2013 Cambridge Audio Azur 851C - 851A

 When is a CD player more than a CD player? When it’s designed to be an outboard D/A converter complete with integral CD drive. This is Cambridge Audio’s Azur 851C, its best player to date and one that combines its most sophisticated DAC design with USB and legacy digital audio inputs. The partnering 851A amplifier is just as slick, employing the latest version of the company’s proprietary Class XD technology to comfortably exceed its 120W specification. So while the 851C DAC/player brings a quiet composure to the party, the 851A is a wolf in sheep’s clothing, a muscular amp that grips the speakers and serves up tight, powerful and extended bass. In the 851C and 851A you’re getting cutting-edge technology for substantially less than high-end prices. Add the best speakers you can afford and this two-channel system will deliver a taste of hi-fi heaven.


 Detailed Specifications 851A
Power Output:  120W RMS into 8 Ω/ 200W RMS into 4 Ω
THD (unweighted):  < 0.001% 1 kHz at 80% of rated power; < 0.01% 20 Hz - 20 kHz at 80% of rated power
Audio Inputs:  2 sets of balanced XLR, 8 further RCA inputs
Audio Outputs:  Preamp output, Record output
Frequency Response:  10 Hz - 50 kHz  ±1 dB
S/N Ratio (ref 1W/8 Ω):  > 93 dB
Input Impedances
Inputs 1 and 2 (balanced):  20 kΩ
Inputs 1-7 (unbalanced):  20 kΩ
Rec Input:  20 kΩ
Power Amp Damping Factor:  > 110 at 1 kHz
Max. Power Consumption:  800 W
Minimum Power Consumption:  70 W Active (no signal)
Standby Power Consumption:   <0 .5w=".5w" p="p">
Controls:  Shelving type
Max bass boost/cut  ±10 dB at 10 Hz
Max treble boost/cut ±7.5 dB at 20 kHz
Dimensions (H x W x D):  115 x 430 x 385 mm (4.5 x 16.9 x 15.2”)
Weight:  15.0 kg (33 lbs)

Detailed Specifications 851 C
D/A Converter:  Dual Analog Devices AD1955 24 bit DACs
Digital Filter:
Analog Devices Black Fin ADSP-BF532 32 bit DSP performing 2nd;
Generation ATF2 up-sampling to 24-bit/384 kHz;
Linear Phase, Minimum phase or Steep modes.
Analogue Filter:  2 Pole Fully Differential Linear Phase Bessel filter
Digital Input 1:  S/PDIF 75 Ω or Toslink optical
Digital Input 2:  S/PDIF 75 Ω or Toslink optical
AES/EBU Input:  XLR balanced 110 Ω per phase
USB Audio Input:  USB Type B conforming to Audio profile 1.0 or USB Audio profile 2.0 (user 1.0 or USB Audio profile 2.0 (user selectable)
Analogue Audio Outputs:  Balanced XLR and unbalanced RCA analogue audio outputs
USB 1.0 16-24 bit, 32-96 kHz;
USB 2.0 16-24 bit, 32-192 kHz;
Toslink 16-24 bit, 32-96 kHz;
S/PDIF and AES/EBU 16-24 bits 32-192 kHz;
CD playback is intrinsically limited to 16-bits 44.1 kHz
Standby Power Consumption:  <0 .5=".5" p="p" w="w">
Dimensions (H x W x D):  115 x 430 x 360 mm (4.5 x 16.9 x 14.7”)
Weight:   10kg (22lbs)

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