B&W SA 250 MKII Amplifier 250W

The 851W has class XD amplification at 200W into 8 Ohms in stereo mode or 500W RMS per amp in mono bridged mode, separate toroidal transformers for the power amp and input/other circuitry, and terrapin impedance buffering modules. All in all it\'s the best sounding amplifier we have ever made.

         Our proprietary Class XD amplification
        Separate toroidal transformers for power amp and input/other circuitry
        Our bespoke Terrapin impedance buffering modules – separating amplifier and signal impedance
        200W into 8 Ohms stereo mode or 500W RMS per amp mono bridged mode
        CAP5 protection from DC spikes, overheating and clipping
                All metal chassis with premium components
        Remote Control – Compatible with the entire 851 range

 Power output – stereo/mono    200W per channel into 8 Ohms
350W per channel into 4 Ohms
Power output – bridged mono    500W 8 Ohms
800W 4 Ohms
THD (unweighted)    < 0.001% 1 kHz
< 0.005% 20 Hz - 20 kHz
Frequency response    5Hz – 80kHz
S/N ratio (ref 1W / 8 Ohn)    >90dB (unweighted)
Sensitivity – stereo or mono    1.5V rms unbalanced
1.5 + 1.5V rms balanced
Sensitivity – bridged mono    0.775V rms unbalanced
0.775V + 0.775V rms balanced
Input impedances    Balanced input 38 kOhm
Unbalanced input 68 kOhm
Power amp damping factor    > 110 at 1 kHz
Max. power consumption    2400W
Standby power consumption    Standby

Class XD™ amplification designed to eliminate crossover distortion at low signal levels
New balanced volume topology controllable in 1dB steps, giving very fine control, and superbly accurate channel balance
Audiophile grade oversize toroidal transformer and substantial extruded heatsink allowing 2 x 120 Watts RMS into 8 Ohms or 2 x 200W into 4 ohms.
Separate transformer taps for left and right channels, twin rectifiers and separate PSUs for dual mono operation of the left and right power amplifiers
A separate toroidal transformer supplies the preamp making the 851A effectively a Pre and Power amp combination in one box
CAP5 protection technology for trouble free operation
Acoustically damped full metal chassis with thick brushed aluminium front panel
Customisable front panel display
Balanced and unbalanced analogue audio inputs for superior connectivity
RS232 controllable
Eco-friendly Available in black and silver finishes

Toroidal Transformer

We mount the premium toroidal transformer centrally, to reduce flux or magnetic disturbance from the volume pot.

The output power transistors used by the CXA60 are not your usual common or garden offerings. They come with an integrated Dynamic Thermal Tracking System. So what does this mean? Normally a Power Output transistor utilises a thermo-coupler attached directly to the heat sink of the amp; this informs the system so that it can re-bias when key temperatures are reached. However, using Integrated Dynamic Thermal tracking provides a far more accurate reading of the real temperature of a transistor, and relays it faster too because itʼs not a delayed heating effect. This enables us to bias the amplifier more accurately and in almost real time. Which means your CXA60 is always running at optimum performance.

If you want to use a subwoofer as part of your speaker complement, the CXA60 doesnʼt penalise you for it. Because we want to ensure thereʼs no unnecessary high frequency noise affecting the subwoofer, weʼve put the output filter at 3kHz. This is high enough to prevent any phase shift associated with the low pass filter affecting what happens below 200Hz. The result is a phase linear subwoofer output signal which is clean and musical.

Thereʼs some revolutionary signal management happening beneath the lid of the CXA60. For the first time, our engineers decided to go fully balanced rather than single-ended all the way through. As a consequence, any noise that that might be picked up in the audio signal while routing through the amplifier is cancelled before itʼs output.

The CX range represents a step change in the way our engineers have approached signal path design, and the result is one of our most musical and entertaining amplifiers yet. Previously, we went to almost surgical lengths to minimise distortion in order to get the best results. This invariably meant 46 components sat in the signal path. For the CX Series, we wanted to dramatically reduce that component count. The CXA60 now has only 24 components in the signal path. The big difference is that there are now 500 support components as well.

Their job is to guarantee those 24 key components are absolutely optimal all the time, regardless of mains fluctuations and other influences. This has made a big difference when it comes to tuning. Previously, tweaking one of the 46 components only made a small difference and it was sometimes difficult to quantify exactly what difference any change made. With the CX series, those 24 components have now actually become quite critical. Changing just one affects the character of the amplifier. We can hear very clearly what each of those components is doing.

This revision has fundamentally changed the character of the amplifier. Listening to a CX series amplifier is fun, engaging and exciting.

If you want to use your CXA60 with a Bluetooth source, we offer an optional BT100 audio receiver. To ensure that this does not interfere with other components in the amplifier, itʼs isolated internally on the digital input board. From the ground up, this is an audiophile Bluetooth device. All the coding for the BT100 is done in-house. We even include an extension cable which enables you get the best Bluetooth range.

Sometimes thereʼs a good reason to keep things uncomplicated. The CXA60 features a high-quality damped metal chassis, designed to ensure that nothing rattles or interferes with the electronics. Weʼve also kept volume control simple. The CXA60 uses a logarithmic ALPS pot. And when it comes to switching inputs, the CXA60 uses relay switching with silver plated contacts. This classic approach is still the best way to move signals around, rather than with transistors or electronic switches.

• Power output:60W RMS into 8 Ohms, 90W RMS into 4 Ohms
• DAC:Wolfson WM8740
• Frequency Response:

Audioengine N22 General Specifications
Type: Compact Integrated Stereo Amplifier Power Output: 80W peak total (22W RMS/40W peak per channel), AES Amplifier type: Dual Class A/B Voltages: 110-240V, 50/60Hz auto-switching for worldwide voltages Inputs: RCA and 1/8" (3.5mm) mini-jack Outputs: RCA variable preamp Speaker outputs: 5-way binding posts SNR: >95dB A-weighted THD+N:

Weight | Metric :28 lbs | 12.70 kg
Dimensions (With Brackets, Feet Removed) :19-1/16" W x 9-5/8" D x 3-7/16" H (41.42 cm W x 24.45 cm D x 8.73 cm H)
Finish :Available in both silver and black
Power Output Two Channels Driven :230 watts each