Sellers Note:I am the original owner of these Krell units. Its are one of several systems I have owned, and it’s been used it sporadically for three years and have been kept in the original boxes. Due to the least used time period, it had no opportunities for scratches or damages and didnt even have a chance to repair. Therefore, an excellent performance is guaranteed.For someone has a question about Re-Cap: (No Re-Cap answer will be provided from the seller)When is the time for electrolytic capacitors to be replaced with Solid State power amplifiers? (From Google Search)Manufacturers of electrolytic capacitors specify the design lifetime at the maximum rated ambient temperature, usually 105°C. This design lifetime can vary from as little as 1,000 hours to 10,000 hours or more. (Answered by Google )Seller Case: How many hours were these amps being used at home? 4 hours/week x 52 weeks =208 hours / year 208 x 3 = 624 hours =Total operting hour Specifications:Krell FPB 450Mcx • Description: Solid-State Mono-Block Power Amplifier with “Sustained Bias Plateau II,” class-A output stage. • Inputs: one balanced (XLR), one Krell CAST (4-pin bayonet). • Loudspeaker outputs: two pairs. • Output power: 450W into 8 ohms (25.4dBW), 900W into 4 ohms (25.4dBW), 1800W into 2 ohms (25.4dBW). • Output voltage: 60V RMS (170V peak-peak). Voltage gain: 26.4dB. • Frequency response: 20Hz-20kHz, +0dB, -0.05dB; 0.1Hz-240kHz, +0db, -3dB. • S/N Ratio: 118dB (A-weighted, no reference level given)). • THD (balanced drive, unweighted): less than 0.03% at 1kHz and 20kHz (no reference level given). • Input impedance (XLR): 100k ohms. • Input sensitivity: 2.6V RMS for maximum power. • Power consumption: 37.5W (standby), 175W (Idle), 3kW (maximum). • Dimensions:Unit, 12.5?W x 10.5?H x 19.0? D Original Box, 18 W x 16 H x 26.0 D Outer Box, 18 W x 16 H x 30.0 D • Weight: Unit; 98 lbs. each Gloss;110 lbs each