Accuphase P-7500

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Accuphase P-7500 Stereo Amplifier: A Concentration of Power and Refinement

The Accuphase P-7500 is the flagship of the Japanese brand’s class AB stereo amplifiers. A true demonstration of engineering prowess and musicality, it combines phenomenal power with cutting-edge technologies to deliver exceptional sound performance. With its amplification stage featuring 10 push-pull power transistors per channel, it delivers a nominal power of 300 W at 8 ohms, 600 W at 4 Ω, and 900 W at 2 ohms. In bridged mode, the power reaches 1200 W at 8 Ω and 1800 W at 4 ohms.

A Massive and Luxurious Chassis

The P-7500 immediately impresses with its imposing metal chassis and thick gold-anodized aluminum front panel, typical of Accuphase products. Measuring 465 x 238 x 515 mm and weighing 49 kg, it is equipped with front handles and large heat sinks on the sides. The superb analog VU meters add a vintage and timeless touch. The connectivity, though simple, allows for bi-amplification or bridged mode operation thanks to a pair of stereo binding posts.

Cutting-Edge Technologies

At the heart of the P-7500 is a sophisticated amplification stage using a three-stage Darlington configuration with 10 pairs of parallel power transistors per channel. Accuphase’s MCS+ (Multiple Circuit Summing-up) technology, featured on two parallel circuits associated with the input stage, reduces background noise by 30%. The asymmetric gain distribution (22 dB for the input stage, 6 dB for the output stage) optimizes performance. The massive toroidal transformer and high-capacity filtering capacitors ensure stable and generous power supply.

Outstanding Specifications

The Accuphase P-7500 boasts remarkable specifications. The signal-to-noise ratio of 130 dB (A-weighted, at maximum power) reflects the brand’s commitment to transparency. The exceptional damping factor of 1000 ensures optimal control of even the most demanding speakers. The extended frequency response from 0.5 Hz to 160 kHz and the very low harmonic distortion rate (between 0.03% and 0.05%) promise sound reproduction of great fidelity and striking realism.

Precise and Versatile Control

The P-7500 features a 4-position gain selector (MAX, -3 dB, -6 dB, -12 dB) that allows the level to be adjusted to the efficiency of the speakers. This setting does not attenuate the signal but controls the gain at the input stage, ensuring great stability and low residual noise. The two pairs of binding posts facilitate bi-amplification or bi-wiring. The P-7500 also incorporates sophisticated protection circuits against short circuits at the speaker terminals, with photo-coupler detection to preserve sound quality.

Meticulous Internal Construction

Inside, the P-7500 reveals a dual mono construction with a powerful power supply centered around a massive toroidal transformer and two enormous 60,000 μF filtering capacitors. The left and right amplification stages are completely separate. The heavy-gauge gold-plated bus bar wiring minimizes impedance on paths where high currents flow. Gold-plated epoxy fiberglass printed circuit boards further enhance reliability and performance. Every detail has been carefully considered to extract the best from this exceptional amplifier.

Japanese Craftsmanship of Excellence

With the P-7500, Accuphase reaffirms its status as a benchmark in the high-end amplifier domain. The result of over 50 years of expertise, it embodies the brand’s philosophy: the pursuit of perfect musical reproduction, without compromise. Entirely designed and handcrafted in Japan according to stringent quality standards, each P-7500 unit is individually tested and listened to before shipment. It is this attention to the smallest details that has earned Accuphase its reputation among audiophiles worldwide.

Is the P-7500 suitable for driving low-efficiency speakers?

Absolutely. With its high output power and exceptional damping factor of 1000, the P-7500 can effortlessly drive the most demanding speakers, even those with low efficiency or complex impedance. It maintains firm control over the speakers in all situations, delivering a wide and detailed soundstage with breathtaking dynamics.

What are the advantages of the bridged mode offered by the P-7500?

The bridged mode of the P-7500 allows the combination of both channels to achieve even greater power in mono, reaching 1200 W at 8 Ω and 1800 W at 4 ohms. This is ideal for systems requiring substantial power reserves, such as high-end home theater setups or subwoofer amplification. The bridged mode fully exploits the capabilities of the P-7500 for sound reproduction of striking intensity and impact.

Does the P-7500’s class AB operation imply significant heat generation?

The class AB operation of the P-7500 does indeed generate more heat than a class D amplifier. However, Accuphase has implemented effective solutions to manage this constraint. Oversized heat sinks located on the sides of the device ensure optimal heat dissipation. Additionally, temperature sensors continuously monitor the power stages to prevent overheating. With an installation that provides adequate ventilation, the P-7500 will operate reliably and safely, even at high power.

Documentation

Technical data sheet Documentation (brochure)

Technical specifications

10 parallel push-pull output stage power transistors
Instrumentation amplifier principle
Current feedback amplification circuits
Balanced remote sensing
MCS+ circuit and current feedback topology in the amplification stage
High damping factor of 1,000
Speaker output protection
Highly responsive large-scale power meters
Supports bi-amplification and bridged mode connection

Guaranteed Specifications

Rated Output Power:
- 300 W/AC (8 Ω)
- 600 W/AC (4 Ω)
- 900 W/AC (2 Ω)
Bridged Connection:
- 1,200 W (8 Ω)
- 1,800 W (4 Ω)
Frequency Response: 0.5 Hz – 160 kHz (0, –3 dB)
Intermodulation Distortion: 0.01% or less
Damping Factor: 1,000 or more (JEITA, 8 Ω load, 50 Hz)
Signal-to-Noise Ratio:
- 130 dB (GAIN: max)
- 135 dB (GAIN: -12 dB) (A-weighted)
Inputs: 1.95 V