Accuphase A-48S Class-A Stereo Power Amplifier

Product Description

The Accuphase A-48S Stereo Power Amplifier redefines Class A amplification, delivering 50W per channel into 8 ohms, 100W into 4 ohms, and 200W into 2 ohms with a damping factor of 800 for exceptional speaker control. As a pure Class A power amplifier, it offers warm, distortion-free sound with extraordinary detail and dynamics, ideal for audiophiles seeking reference-grade performance. Featuring a six-fold parallel push-pull power stage, MCS+ circuitry, and a robust power supply, the A-48S ensures transparent, noise-free audio. Its champagne gold panel, large VU meters, and Japanese craftsmanship make it a stunning addition to high-end hi-fi systems.  

Key Features  

• Pure Class A Power: Outputs 50W per channel into 8 ohms, 100W into 4 ohms, and 200W into 2 ohms, providing linear, distortion-free sound for demanding speaker loads.  
• Six-Fold Push-Pull Output: Six parallel push-pull power MOS-FETs per channel, mounted on large heatsinks, deliver high-current amplification for dynamic, effortless performance.  
• MCS+ Circuitry: Multiple Circuit Summation enhances signal purity, reducing noise for a transparent, detailed soundstage.  
• High Damping Factor (800): Optimized MOS-FET switches with ultra-low on-resistance ensure precise speaker control, delivering tight, articulate bass across frequencies.  
• Robust Power Supply: Massive toroidal transformer and dual 47,000μF filtering capacitors (94,000μF total) provide stable, clean power for high-current demands. 
• Balanced Input Stage: Instrumentation amplifier topology with current feedback minimizes interference, ensuring pristine audio with excellent phase accuracy.  
• Versatile Connectivity: Includes 1 RCA unbalanced input and 1 XLR balanced input per channel, with speaker terminals supporting A/B configurations and bi-wiring.  
• Advanced Protection: MOS-FET-based circuitry protects against short-circuiting, DC voltage, and overheating, ensuring reliability without relay contact resistance.  
• Bridged Mono Operation: Can be configured as a monoblock amplifier, delivering 200W into 8 ohms, 400W into 4 ohms, and 800W into 2 ohms for high-power setups.  
• Elegant Design: Champagne gold panel, backlit VU meters, and sleek chassis reflect Accuphase’s meticulous craftsmanship, ideal for premium audio setups.

Why Choose the Accuphase A-48S?

The A-48S embodies Accuphase’s Class A expertise, drawing on technologies from flagship models to deliver a warm, vibrant soundstage with unparalleled clarity. Its six-fold MOS-FET power stage and MCS+ circuitry ensure noise-free performance, while the high damping factor of 800 provides precise control over even the most challenging speakers. Users praise its rich, detailed sound and ability to drive low-impedance loads, though some note a slightly forward treble that benefits from careful preamplifier and speaker pairing. With robust connectivity, bridged mono capability, and handcrafted Japanese build quality, the A-48S is a versatile, future-proof choice for high-end stereo systems, offering performance that rivals more expensive amplifiers.  

Product Specifications  

• Power Output (Stereo): 50W/channel (8 ohms), 100W/channel (4 ohms), 200W/channel (2 ohms)  
• Power Output (Bridged Mono): 200W (8 ohms), 400W (4 ohms), 800W (2 ohms) 
• Amplifier Type: Pure Class A, six-fold parallel push-pull power MOS-FETs  
• Damping Factor: 800  
• Frequency Response: 20 Hz–20 kHz (+0, -0.2 dB) at rated output; 0.5 Hz–160 kHz (+0, -3 dB) at 1W  
• Total Harmonic Distortion: 0.03% (2–16 ohms)  
• Signal-to-Noise Ratio: 122 dB (max gain)  
• Input Sensitivity: 0.87V (8 ohms, rated output)  
• Inputs: 1 RCA unbalanced, 1 XLR balanced per channel  
• Outputs: Speaker terminals (A/B, bi-wiring capable)  
• Power Supply: Toroidal transformer, dual 47,000μF capacitors  
• Controls: Gain switch (MAX, -3 dB, -6 dB, -12 dB), meter operation switch  
• Dimensions: 18.3" W x 8.3" H x 16.9" D (465 x 211 x 429 mm)  
• Weight: 76.1 lbs (34.5 kg)  
• Warranty: Contact authorized dealer for details

What’s Included  

• Accuphase A-48S Stereo Power Amplifier  
• Power cord  
• User manual

Perfect For  

• Audiophiles seeking pure Class A amplification for high-end stereo systems  
• High-power setups using bridged mono mode for demanding speakers  
• Hi-fi enthusiasts needing a compact, reference-grade power amplifier with premium aesthetics