Audio Research DS450M Monoblock Power Amps

These amplifiers are top-of-the-line for fidelity, power, and authority--but also for convenience. These are Audio Research amps through and through, with all the clarity, precision, and power that means. They are tailor-made to drive speakers with high power needs. But what sets these apart is ARC's proprietary class D circuit: it is so efficient and runs so cool that you can place these anywhere (even in a cabinet) and leave them powered on 24/7. Yes, these are the first-high-power ARC amps that are always warmed up and ready for listening when you are. These units are in mint condition, with only 150 hours of break-in time, over just two months, and are already back in their boxes. (We chose to go with an all-tube system, but our indecision can be your savings!) Included are the original 20-amp power cords, all manuals, and all original packaging. No extra fee for payment via Paypal. Questions? Feel free to call me at (202) 615-8696. Or email: [email protected]. Here's ARC's description: The DS450M mono amplifier adds a new level of performance and flexibility to our Definition Series of amplifiers. Providing abundant power, dynamics and control in a compact chassis, the DS450M rounds out the DS amplifier lineup. The DS450M has the same chassis size as the DSi200 and DS225, and continues the same design philosophy of other Definition Series amplifiers. Our proprietary “hybrid Class D” all-discrete analog switching-mosfet output technology is combined with an enormous linear analog power supply, yielding tremendous speed and power delivery in a compact, cool-running chassis. This remains a distinctive Audio Research design from the ground up, forsaking the use of prepackaged “OEM” solutions common to other switching amplifiers. Each DS450M idles at only 55 watts. One major enhancement that allows a pair of DS450M’s to offer even higher performance than a DS450: the energy storage of a pair of DS450M monoblocks is 1,368 joules, an increase of 62% over the DS450. The immense power supply will jump-start the most inefficient speakers when the music demands it. The DS450M is a fully balanced design with both XLR balanced inputs and RCA single-ended inputs. The rear panel features a dual Cardas patented speaker binding post and two 12V triggers. A 12-gauge detachable power cord with a 20A IEC connector is included. In addition to the standard all-silver version, the DS450M is also available with a black front panel, black handles, and black top cover. The DS450M builds on the foundation of its siblings, with great resolving power, pinpoint imaging, and a musicality that is immediately involving. The enormous power supply provides an authority and sense of dynamics that are breathtaking with whatever music you choose. Whether it is used in the most refined music system or the most over-the-top video system, the DS450M will provide a level of performance and value that is startling. SPECIFICATIONS POWER OUTPUT: 450W into 8 ohms (650W into 4 ohms), 1% THD. POWER BANDWIDTH: (-3dB points) 5Hz to 45kHz into 8 ohms. FREQUENCY RESPONSE: (-3dB points at 1W) 5Hz to 45kHz into 8 ohms. INPUT SENSITIVITY: 2.9V RMS for rated output (26dB Gain) single-ended or balanced. INPUT IMPEDANCE: 150K ohms single-ended, 300K ohms balanced differential. OUPUT POLARITY: Non-inverting from single-ended input. Balanced pin 2+ (IEC-268). OUTPUT REGULATION: 0.02dB 8 ohms loaded to open circuit (Damping factor 440). OUTPUT CURRENT: ~35 amps peak at protective shutdown. SLEW RATE: 5 volts/microsecond (20% maximum duty cycle). RISE TIME: 8.0 microseconds. HUM & NOISE: