Denon POA-6600A, very good condition: This pair of Denon Mono Power Amplifiers is in great technical condition. Both had a upgrade from Triple M company with much better capacitors and in/output connectors. They offer enormous power resources even at complicated loads. 280 watts into 8 Ohms guarantee to handle almost every speaker. With their balanced inputs, best signal to noise ratio as well as dynamics are self-evident. The "A"- Version is an entirely optimized amplifier with optimized circuit layout, separated power supply board and a very efficient heat sinks/thermal flow. These units do not break down like the first versions. Minor marks, superb sound quality! Specifications Power output: 250 watts into 8Ω (mono) Frequency response: 20Hz to 20kHz Total harmonic distortion: 0.002% Input sensitivity: 1V Signal to noise ratio: 123dB Speaker load impedance: 4Ω to 16Ω Dimensions: 310 x 207 x 456 mm Will be shipped in two boxes.