STATUS - SOLD
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Description :
The Perreaux 750P is very similar to the current Perreaux 750 Prisma model with difference that the front panel and cover are replaced and the LED changes to a blue color. When compared to the older 750 model, the 750P features 2 small silver 3.5mm sockets in the rear panel for master slave applications as well as an electronic soft charge PCB fitted inside. The 750P is a high quality, reference, 750W monoblock hi-fi audio power amplifier, incorporating true-balanced circuit topology and custom designed toroid power supply. It includes two pairs of binding posts make bi-wiring speakers a simple task. Mechanical strength has always been a hallmark of Perreaux products. The concept behind the physical design and construction is that each structural member should contribute to both rigidity and performance. The massive custom designed, toroidal power transformer employs unusually heavy gauge wire that reduces copper losses to a minimum. The power supply filter capacitors in the Perreaux 750P, totaling 60,000uF, have exceptionally low inductance and internal resistance. They charge and discharge in response to load demand far more rapidly than conventional storage capacitors and are capable of delivering the instantaneous current required by the output stages, providing optimum dynamic range and transient response. The wiring from the power supplies to the output boards is designed for unimpeded transmission of the required current and voltage and utilizes heavy gauge, tinned copper wire cables. Since power supply leads radiate at signal frequencies, all wiring is carefully loomed to minimize this effect. An electrostatic shield prevents AC line borne interference from entering the signal path.
The bi-polar transistors used in the Perreaux 750P are operating in class-A, avoiding the crossover notch distortion and the resulting odd-order harmonics present. The devices used in the 750 output stage are MOSFETs, which with high quiescent current circuitry, are run in the equivalent of Class-A to 10 watts. A major advantage to bi-polar transistors is their tendency to draw less current over a large section of the power bandwidth as their temperature rises (Negative Temperature Coefficient), hence stabilizing itself thermally. They have the ability to swing fully across the amplifier’s internal DC voltage and are therefore true "rail-to-rail" devices. Using MOSFETs encourages the highest performance from the balance of the internal amplifier circuitry. The Perreaux 750P also incorporates a full range of protection circuits, isolated from all signal carrying circuits via opto-couplers. However, these circuits are aimed at ensuring an extremely high safety margin for these high-powered products rather than as a mandatory addition to correct for poor or overloaded circuit topologies. The 750P utilizes soft start circuitry to protect the fuses and/or circuit breakers in the home’s mains power supply. Sound wise, the Perreaux 750P improves separation of soundstage, and add weight and headroom to the sound, resulting in an exceptional sonic impact.
Specifications :
Rated Power Output.........................750W RMS into 8 ohms
.........................continuous, driven from 20Hz to 20kHz at <0.040% THD
.........................1300W RMS into 4 ohms
.........................continuous, driven from 20Hz to 20kHz at <0.070% THD
Frequency Response........................5Hz to 40kHz +/- 0.25dB
Total Harmonic Distortion + Noise......Typically: 0.008%, at 1kHz into 8ohms
......20Hz to 20kHz: <0.040%, into 8 ohms
Voltage Gain....................................34.3dB
Dynamic Headroom..........................>1.1dB, rated with music
Voltage Swing..................................322V p-p
Maximum Current Output..................160A
Damping Factor................................>700, at 1kHz into 8 ohms
Signal-to-Noise Ratio........................Rated Output (unweighted): 100dB
Input Sensitivity................................Unbalanced: 1.5V RMS
................................Balanced: +/- 0.78V RMS
Input Impedance...............................Unbalanced: 22k ohms
...............................Balanced: 3k ohms
Smoothing Capacitance.....................60,000uF
Driver Stage......................................Class A
Output Stage....................................Class A/AB
Audio Inputs.....................................Unbalanced: 1 x RCA connector
.....................................Balanced: 1 x XLR connector
Audio Outputs:.................................2 x pairs of speaker binding posts
Other Connections............................1 x IEC AC mains input receptacle
............................1 x 3.5mm "mini" jack for master remote input, 5 to 12V DC
............................1 x 3.5mm '"mini" jack for slave remote output, 12V DC
Power Consumption..........................Idle: 65W
..........................Maximum: 1400W, at 45 rated output
Mains Input Voltage..........................100V, 110V, 120V, 220V, 230V or 240V AC at 50Hz or 60Hz
..........................Set within the 750 at time of manufacture
Mains Input Fuse Ratings.................100 to 125V: 2SB slow blow 15A
.................200 to 250V: 2SB slow blow 10A, user serviceable
Internal DC Rail Fuses......................4 x 2AG normal blow 10A, not user serviceable
Dimensions(w x d x h)......................48.5 x 53 x 19.5 cm
Weight............................................30kg per side
Miscellaneous :
XLR Inputs.......................................Yes
Made In...........................................New Zealand
Condition.........................................7/10
Product Information :
http://www.perreaux.com/products/prisma/750_-_monoblock_power_amplifier/ (Manufacturer's Website)
http://www.perreaux.com/assets/file/perreaux_manual_prisma_750.pdf (Manual)
Reviews :
http://www.infinite-resolution.com/files/a_tale_of_two_audio_systems.pdf (Starts from bottom of page 2)
http://www.perreaux.com/assets/file/perreaux_review_sm6.750_Franco_Guida_-_Italian.pdf (Italian) |
