CA-D200 Delta STEREO AMPLIFIER + CP-800 Digital Preamplifier

CA-D200 Delta STEREO AMPLIFIER 200W withCP-800 Digital Preamplifier CA-D200 The CA-D200 is a new and innovative amplifier design that uses what are called...

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  • CA-D200 Delta STEREO AMPLIFIER + CP-800 Digital Preamplifier
  • CA-D200 Delta STEREO AMPLIFIER + CP-800 Digital Preamplifier
  • CA-D200 Delta STEREO AMPLIFIER + CP-800 Digital Preamplifier
  • CA-D200 Delta STEREO AMPLIFIER + CP-800 Digital Preamplifier

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CA-D200 Delta STEREO AMPLIFIER 200W
with
CP-800 Digital Preamplifier

CA-D200

The CA-D200 is a new and innovative amplifier design that uses what are called switching technologies. Switching amplifiers and power supplies offer many advantages but present different challenges and a higher degree of complexity than conventional linear designs. Their potential is too great to ignore, however, which is why the Classé Design team now includes engineers with over fifty years combined experience in switching amplifier and power supply design. The result is the CA-D200, the first of its type from Classé; the first of its type—period.

Switching Power Supply
A new Switch Mode Power Supply with Power Factor Correction, provides over 1,000W of clean, stable power to the CA-D200 amplifier circuitry. The SMPS and PFC each operate at over 90% efficiency, yielding impressive benefits for power delivery. The low frequency dynamics, extension and control of the CA-D200 and its ability to effortlessly drive difficult speaker loads can be credited in large part to the powerful and sophisticated power supply it employs. The SMPS with PFC is ideally suited to the demands of the CA-D200’s revolutionary switching amplifier topology.

Switching Amplifier
Some technical limitations have been commonly accepted as inherent in switching amplifiers—until now. Perhaps the biggest limitation is called dead-band time, which translates directly to distortion and tempts designers to employ excessive amounts of negative feedback to compensate. With its proprietary drivers and DSP tools, the Classé Design team solves the dead-band time problem with precision and consistency for each and every CA-D200. On power up, controller circuitry analyzes and adjusts to minimize the dead-band time for each pair of outputs. In this way, part tolerances and drift for each individual amplifier are taken into account. Lastly, the feedback loop is closed using the least amount of negative feedback required. Our linear phase output filters are then employed only to filter the 384 kHz switching frequency, not to roll off the top end of the audio band, as is often done to try to make amplifiers with high dead-band time more listenable. The result is a wide and deep soundstage with extended high frequencies that reveal a musically detailed and open midrange and top end.

Summary
The CA-D200 employs proprietary component parts and DSP technology along with sound engineering practice to optimize its sonic performance at an affordable price of admission for a Classé amplifier. Listen and hear for yourself how beautiful great value can sound.

Specifications:

All tests un-weighted and 500kHz measurement bandwidth (except SNR).

Frequency response

 

10 Hz - 20 kHz, -1 dB into 4Ω

Output power

 

200W/Ch rms into 8Ω (14.5dBW)
400W/Ch rms into 4Ω (14.5dBW)

Harmonic Distortion

 

<0.018% @ 1kHz Balanced Input

Peak Output Voltage

 

113V peak to peak, 40V RMS no load
113V peak to peak, 40V RMS into 8Ω

Input Impedance

 

100kΩ Balanced / 50kΩ SE

Voltage gain

 

29 dB

Input level at clipping

 

1.4V rms Balanced/SE

Intermodulation
Distortion

 

>80 dB below fundamental
into 8Ω Balanced

Signal to Noise Ratio

 

-100 dB at peak output into 8Ω
Measured Bandwidth 20 kHz

Mains Voltage

 

90-264V, 50/60 Hz

Standby power
consumption

 

3W @ 120V; 4W @ 230V

Dimensions

 

Width 17.5” (445mm)(excluding connectors)
Depth 16.5” (419mm)
Height 4.78” (121mm)

Weight

 

28lb (12.7kg) Net
37lb (16.3kg) Gross


CP-800 Digital Preamplifier

The CP-800 shares the curved aluminum front panel Classé has used for its Delta-series products since the beginning of the century. This starts life as a flat extrusion with raised edges, and is gently bent into a U to form the front and side panels. Dominating the front panel is a large color LCD touchscreen that, in combination with the chunky metal remote, gives the user access to all functions via the usual hierarchical menu tree.

Flanking the touchscreen, within its bezel, are the Menu (left) and Mute (right) buttons, these duplicated on the remote. A black horizontal styling strip conceals: the Standby On/Off button to the left of the screen and, to the right, the infrared remote receiver window; a USB host connector for an iPod (Apple portable devices only; the CP-800's remote can control the iPod's transport functions); and a ¼" headphone jack. The large black knob for the shaft encoder that controls volume is at the right end of the black strip.

On the bottom of the rear panel are, from left to right: three pairs of unbalanced analog inputs on RCA jacks; two pairs of balanced analog inputs on XLR jacks; and two pairs of balanced outputs on XLRs, along with a single XLR output labeled Sub—all with their unbalanced counterparts on adjacent RCAs. The second pair of outputs can be assigned to double the main output pair, to permit biamping; alternatively, they can be used to provide stereo subwoofer outputs. The Sub output passes a mono low-frequency signal when enabled, but when the CP-800 is set up via the menu to manage bass, there is full control of crossover frequency and high-pass filter slope.

The CP-800's rear-panel USB port operates in asynchronous mode, in which the flow of data is controlled by the DAC clock, not the computer. But the CP-800's operating mode, which Classé calls Optimal Asynchronous with Single Clock Substrate, differs from topologies used in competing products. Usually, the microcontroller in the asynchronous USB receiver chip controls the master clock. In the CP-800, a high-precision clock signal is buffered by a high-speed Field-Programmable Gate Array (FPGA) chip placed next to the DACs and master-clock oscillators. This is said to result in increased clock purity and more accurate D/A conversion. Additionally, when the CP-800 is processing data encoded at 44.1kHz and its multiples, the 48kHz master clock is turned off, and vice versa, to avoid cross contamination.

In Analog Bypass mode, analog signals are fed straight to the volume control and output circuits and the digital clocks are turned off. (The volume control is implemented with two two-channel Burr-Brown PGA2310 programmable-gain chips, one per channel used as a differential volume control.) However, the tone or equalization controls are implemented using two Analog Devices DSP chips. So if the user wants to use these controls, the analog input signals are converted to 24-bit digital data with a Cirrus Logic 5381 A/D chip. Digital data are turned back to analog using two Wolfson WM8741 DAC chips, each of these a high-performance, multi-bit, sigma-delta, two-channel type capable of operating with 32-bit data. Each DAC chip operates in differential mode, one per channel, and runs at a constant rate of 176.4 or 192kHz. The voltage-output DACs are followed by a fourth-order reconstruction filter with a 100kHz passband.

Operation
While the CP-800 offers myriad customizing options via its touchscreen menu, the default settings out of the box proved to be all that I needed. Pressing any part of the touchscreen's Home screen or the Source Select button on the remote allows you to choose a digital or analog input. The chosen source is then displayed on the bottom left of the Home screen. If digital, the Home screen displays the current sample rate in small print at the bottom. Large numerals in the top half of the screen indicate the current volume setting.


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