Primare A32 and Pre30 Class AB amp 250/400 watt

Primare A32 and Pre30 Class AB amp 250/400 watt Introduction

- Low hours (less than 5 hours listening per week in the past years) . - I am the 1st owner for both units and purchased from Sound and Space Fine Audio in London Ontario. - No noise at low level. This system kept in temperature controlled room with no humidity concern. - All connectors work like new since I am not into cable swap or moving device around for audio testing, - Original box and packaging for secure shipment - Class AB amplifier at 250W for 8ohm / 400W for 4ohm speaker Premium Swedish audio brand: Primare A32 Power Amplifier and Pre30 Package in excellent condition. Both with original boxes and packaging. The PRE30 comes with C22 Remote control. Primare has very high craftmanship and awesome sound. Both unit in excellent working condition with no repair or noise. It was primarily used to run a pair of Acapella floor speakers. Too much technical info to list. This is a fantastic sounding, high current Class A/B amp, which will drive even the most difficult speakers. Power output is 250/400 WPC. The amp weighs 45kg, has a 2KVA transformer and 180,000 uF of capacitance. It accepts either single ended or balanced inputs and converts single ended sources to balanced. It is biased slightly on the warm side. The fins get moderately warm. Tiny cosmetic imperfection to the left of Primare logo. See picture for details. Reason for Selling I am going to have a major upgrade to McIntosh integrated amp MA12000. $3300 combo price reduced to sell Payment preferred in cash. Low baller will be ignored. The net weight of amp itself is 45kg. Preferred local GTA buyer or ship within Canada at buyer's cost. If you have time to read, here are more information: The A32 is a two-channel dual-mono power amplifier designed as the ideal output stage in a home theatre or hi-fi system. Audiophile Topology The A32 is a high power fully balanced power amplifier, capable of delivering 250W per channel into an 8 ohm load. Balanced signal transmission means that two signal lines are used, which carry the same signal with opposite phase. Before the output stage the signals are mixed, and since any noise will be present in both lines with identical phase, such distortion products are cancelled out leaving only the pure original signal. Balanced topology therefore keeps the signal as free as possible from interference. The A32 has a dual-mono topology together with a current feedback topology. Excellent 1% MELF resistors from Vishay are used, which in concert with a tight PCB-layout, give the A32 the best possible performance. The circuit is fully-balanced all the way to the output stage and uses active temperaturecompensated current sources, instead of passive resistors. The A32 uses 16 output devices from Toshiba for each channel to ensure high reliability and performance (high current output). These work in high bias class A/B configuration. The A32’s outputs are fully protected against DC (servo-controlled), high temperature and speaker terminal shorting (the latter by the use of fast-blow fuses). Alternative methods of protection, such as current limiting, affect sonic performance when using low impedance speaker loads. The amplifier incorporates two different kinds of standby mode. The first is the audiophile standby, in which all the power supplies remain active, only the speaker relay and idle current are lowered. This means that the amplifier will start at optimum performance and will not require any major warm-up time. The second standby mode turns off all of the analogue power supplies and will therefore require a warm-up period before the A32 will perform at optimum levels. This mode is best used if the amplifier remains idle for an extended period of time or if the owner wants to save mains power. Audio connections For maximum flexibility both balanced and unbalanced inputs are provided, as well as twin sets of speaker terminals (for bi-wiring) together with trigger (4-15V) and RS232C inputs. If the unbalanced inputs are used, the A32 internally converts the signal to balanced, to take full advantage of its balanced design. Shortest signal paths SMD technology is used whenever possible to keep the shortest possible signal path for the highest possible performance. Clean power supply for the best possible performance The A32’s massive 2000VA toroidal transformer has four separate windings – two for each (L&R) channel. This means that the channels are insulated from each other, minimizing cross-talk. Double rectifiers per channel are used to create a “floating ground” for the best possible galvanic insulation from the mains. The electrolytic bank is 90.000 uF per channel to ensure that is more than enough power available for even the deepest sonic transient. The soft start circuit is relay controlled which means that it will not have any affect on the power supply when the amplifier has stabilized. More commonly used circuits built around NTC-resistors can adversely affect the power supply under heavy load conditions. The digital control functions have their own power supply using a separate transformer. All digital control functions are insulated from the analogue circuits by using either optocouplers or relays. This configuration ensures that no digital disturbance can be transferred to the analogue circuits of the amplifier. Careful design for operational stability As with all Primare units, the A32 is housed in an alloy heavy gauge steel chassis, which provides strength, rigidity, and temperature stability, while being effective at damping vibrations from external sources. Using the A32 with other Primare products Although the A32 is flexible enough to act as the output stage in virtually any system, it is ideal for use with other products in the Primare range, such as the Primare pre-amplifier Pre30 or network player. Features and Specification – 2000VA toroidal transformer. – A total of 180,000 uF electrolytes in the power supply. – Dual set of speaker terminals for each channel. – Balanced (RCA) and Unbalanced (XLR) inputs. – Input impedance: 15kohm, RCA and XLR – Output Power (both channels driven): 2x250W 8 ohms load 20Hz-20Khz – 2x400W 4 ohms load 20Hz-20kHz – THD+N: below 0.05% in both cases. – THD+N: 1kHz, 250W, 8 ohm load below 0.01%. – Frequency response: 20Hz-100kHz –0.5dB – Noise: below –100dBV – Gain: 26dB unbalanced, 20dB balanced. – Trigger input range: 4-15V. – Temperature protection 70 degrees celcius. – DC offset protection. – Weight 40 kg approx. 88 pounds. – Dimensions 430 x 540 x 230mm (WxDxH) Useful Information: - User Guide: https://primare.net/wp-content/uploads/2017/06/A32UserGuide.pdf - User Guide: https://primare.net/wp-content/uploads/2017/06/PRE30-user-manual.pdf - Design Brief: https://primare.net/wp-content/uploads/2017/06/A32DesignBrief.pdf - Review: https://www.hifiengine.com/manual_library/primare/a32.shtml - https://www.hifix.co.uk/primare-a32-dual-mono-power-amplifier Rotel Marantz Luxman Denon Yamaha