Accuphase PX 600 Brochure
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The solution for high-end multi-channel surround sound six totally sepa- rate power units with identical performance deliver ample power: 150 W × 6 (4 ohms), 100 W × 6 (8 ohms). Robust power supply with large 700 VA toroi- dal transformer. Current feedback topology assures excellent high-frequency characteristics. Bridged mode produces stunning 300 W × 3 (8 ohms). The CX-260/PX-600 is the long-awaited preamplifier/power amplifier combination from Accuphase designed from the ground up for multi-channel surround systems that aim for absolute top quality in picture and in sound. Accuphase's extensive experience in the realm of pure audio is in evidence everywhere in these components. Finally, the true audiophile can move beyond two-channel stereo and build a system that provides audiovisual enjoyment without making any sacrifices when it comes to sonic accuracy. Discover a new world where sound and image blend to form a home theater with true high-end performance. The Power Amplifier PX-600 incorporates six identical high-performance amplifiers, making it possible to reproduce six channels with top- notch quality. The amazingly realistic sound stage and dynamic scale that can be created with the PX-600 go far beyond the limitations of conventional surround sound. The capability for bridged mode operation allows further upgrad- ing of the unit to sustain, for example, three high- output channels. Various configurations rang- ing from one to six channels can be realized, combining flexibility with superb sonic perfor- mance. Six totally separate power units with identical performance allow operation in one to six channels Figure 1 shows a block diagram of the PX-600. The six high-quality power units can reproduce for example the 5.1ch sound from a DVD player source with unprecedented realism and authority. It is also possible to bridge two blocks each, and to combine normal mode and bridged mode operation. This results in utmost flexibility, covering a range from 1 to 6 channels. For example, you can enjoy two-channel stereo in pure audio fashion or realize a high-class bi-amping setup. In combination with a multi- channel divider, 2-way or 3-way systems as well as subwoofer enhanced systems can also be configured. Parallel push-pull output stages for ample power6-channel operation: 150 W × 6 (4 ohms), 100 W × 6 (8 ohms) 2-channel operation: 220 W × 2 (4 ohms), 130 W × 2 (8 ohms) The output stage uses high-power transistors rated for a collector dissipation of 150 watts and collector current of 15 ampere. These devices offer extraordinarily wide and flat frequency response, and their forward-current transfer ratio linearity as well as their switching characteristics are excellent. These devices are arranged in a parallel push-pull configuration (Figure 2) and mounted to very large aluminum diecast heat sinks for efficient cooling.Bridged mode generates even more output muscle 3-channel bridged operation: 320 W × 3 (6 ohms), 300 W x 3 (8 ohms) 2-channel bridged operation: 420 W × 2 (6 ohms), 350 W x 2 (8 ohms) For bridged mode, two amplifiers with opposite polarity are driven with a reverse-phase input signal, and the output of both amplifiers is combined before being sent to the speaker. This allows upgrading to even higher power, providing ample reserves even with very demanding source material. Current feedback circuit topology prevents high-range phase shifts The PX-600 uses the signal current rather than the more conventionally used voltage for feed- back. The impedance at the current feedback ✻ Do not stack the CX-260 and PX-600. Principle of current feedback amplifier Fig. 1 Block diagram of PX-600
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point is kept very low, which means that there is almost no phase shift. Phase compensa- tion via negative feedback can there- fore be kept to a minimum, resulting in excellent tran- sient response and superb sonic trans- parency. Figure 3 shows frequency response for differ- ent gain settings of the current feed- back amplifier. The graphs demon- strate that response remains uniform over a wide range. Robust power supply with large "Super Ring" toroidal power transformer and high filtering capacity In any amplifier, the power supply plays a vital role as the source of energy for the entire unit. The PX-600 spares no efforts in this regard thanks to its large, highly efficient 700 VA toroi-dal power trans- former. The trans- former is housed in a non-resonant aluminum enclo- sure filled with damping material that has excellent heat transfer char- acteristics. This transformer type is ideal for high- power amplifiers, since it is charac- terized by very low impedance, com- pact size, and very high conversion ef- ficiency. In addition, two enormous 47,000 µF electrolytic capacitors provide more than ample filtering capacity for the rectified current. Three large analog power meters can be switched to show direct power readings for 6 channels. A meter operation/light on/ off switch is also provided. Large speaker terminals Balanced connection protects against externally induced noise. BIAS STABILIZER CIRCUIT Balanced input connectors Fig. 3 Frequency response with current feedback (Response does not change when gain is varied) Total of six channel power amplifier units (with parallel push-pull output stage and current feedback) mounted to large aluminum diecast heat sinks. Fig. 2 Amplifier section circuit diagram (1 channel)