Усилители мощности стерео — AVM Ovation SA 6.3

The Ovation SA 6.3 is a stereo power amplifier from AVM, built by hand at the company's factory in Malsch, Germany, as part of the Ovation series. The circuit uses MOS-FET output devices in a class A/AB topology described by AVM as High Current Technology, and it delivers 2 x 200 W into 8 ohms and 2 x 350 W into 4 ohms. The aluminium enclosure is sold in silver or black, with an optional chrome fascia.

Key specs that matter

Each channel uses 20 MOS-FET transistors, which together can supply a maximum current of 180 amperes. Input impedance is 6.8 kOhm on RCA and 14 kOhm on XLR. The signal-to-noise ratio is 101 dB(A), and total harmonic distortion stays below 0.01 percent when measured at 25 W into 4 ohms. Frequency response runs from under 5 Hz to 100 kHz. The damping factor is greater than 500. Maximum power consumption reaches 1,000 W, while standby draw is under 0.5 W. The chassis measures 430 x 130 x 390 mm and weighs 21 kg.

Engineering and use context

A 1,000 VA toroidal transformer feeds the supply, and three separate supplies feed the power stages, the processor and the input circuit, so the control electronics do not share a rail with the output devices. The input stages are fully balanced and DC-coupled throughout, which AVM links to lower distortion and noise. A large graphic display with blue lighting sits on the front panel and gives access to menu functions such as adjustable input sensitivity and a peak power readout. AIR-trigger technology (AVM Intelligent Remote) switches the amplifier together with a compatible AVM preamplifier. Like every Ovation model, each unit passes repeated quality checks and a burn-in lasting several days before shipment. AVM grants four years of warranty with product registration.

Pairing

Both balanced and single-ended connections are provided, so the SA 6.3 accepts either cable type from the preamplifier, while an AVM preamplifier also allows switching through the AIR link. Lower-impedance loudspeakers pose no difficulty on paper, since the 4 ohm rating and the high current capacity of the output stage both point to reserves for such loads. Its 130 mm height and 430 mm width match the Ovation PH 8.3 phono stage, so the two components share one footprint in a rack.

Alternatives

The AVM Ovation SA 8.3 Lite is a stereo power amplifier with 24 MOS-FET transistors per channel, rated at 225 W into 8 ohms and 500 W into 2 ohms.