Description
Accuphase A-48S Class A Power Amplifier
Precision Class A Performance in a Compact Design
The A-48S is a state-of-the-art Class A stereo power amplifier that packs exceptional performance into a familiar, compact chassis. Featuring a 6-parallel push-pull power MOS-FET output stage, it delivers consistent linear output at all impedance levels—50 W into 8 ohms, 100 W into 4 ohms, 200 W into 2 ohms, and 400 W into 1 ohm. Despite its size, the A-48S boasts a 6% reduction in noise and a remarkable damping factor of 1,000, ensuring absolute control and sonic finesse across the frequency spectrum.
Refined Engineering for Musical Clarity
At its core, the A-48S uses a fully discrete signal input section based on the instrumentation amplifier principle, reducing noise and preserving signal integrity. Current feedback amplification and MCS+ circuitry combine to provide exceptional speed and stability, while Balanced Remote Sensing ensures precise damping of speaker motion. Whether you’re playing delicate classical passages or high-energy rock, the A-48S renders your music with lifelike depth and resolution.
Built to Perform, Designed to Last
The A-48S is engineered for durability and reliability. It features a massive toroidal transformer, 68,000 μF filter capacitors, and glass cloth fluorocarbon resin PCBs. Robust protection circuits—using MOS-FET switches instead of mechanical relays—guard against short circuits without affecting audio purity. With its aluminum hairline top plate, high-sensitivity analog power meters, and vibration-isolating cast iron feet, the A-48S combines refined aesthetics with uncompromising sonic integrity.
Key Features
- Class A driven 6-parallel push-pull MOS-FET output stage
- Linear output of 50 W / 8Ω, 100 W / 4Ω, 200 W / 2Ω, 400 W / 1Ω
- Instrumentation amplifier-based input stage for low noise
- Current feedback amplification and MCS+ circuit for stability and accuracy
- Balanced Remote Sensing ensures precise speaker control
- High damping factor of 1,000 for authoritative sound
- High-efficiency toroidal power transformer
- 68,000 μF large-capacity filtering capacitors
- Large speaker terminals directly linked to protection circuitry
- Protection circuitry using high-reliability MOS-FET switches
- Bi-amping and bridged connection options for advanced setups
- High-sensitivity analog power meters with wide dynamic range
- Aluminum top plate with hairline finish
- High-carbon cast iron feet for vibration damping
