Acoustic Research XB1

The Acoustic Research XB1 is a classic 2-speed belt-drive turntable introduced in the early 1970s, known for its robust engineering and clear, stable sound reproduction. It was designed to meet National Association of Broadcasters (NAB) standards for broadcast equipment, ensuring high performance and precision.

Technical Overview

Drive and Motor:

• Belt-driven system with an A/C hysteresis synchronous motor.

• Motor speed is stable and precise, contributing to low wow and flutter.

• Speeds supported: 33⅓ and 45 rpm.

• Motor power: typically 240 VAC, 50 Hz (depending on region).

Platter:

• Suspended aluminum two-part platter weighing approximately 4 lbs (1.8 kg).

• Platter runs on an oil bearing for smooth, low-friction rotation.

• Platter diameter approximately 11.75 inches.

Tonearm:

• S-shaped 12-inch tonearm with oil bearing.

• Plug-in cartridge shell with mounting hardware.

• Includes overhang adjustment guide and precision stylus pressure gauge.

• Tonearm rest made of metal.

• Cueing system is viscous-damped for smooth lowering and lifting of the arm.

Suspension:

• Sub-chassis suspended on three springs to isolate the tonearm and platter from motor vibrations and external disturbances.

• This suspension design is a hallmark of AR turntables, providing excellent vibration isolation and contributing to the turntable’s stable sound.

Performance:

• Wow and flutter approximately 0.3%.

• Rumble better than -40 dB.

• Known for clear, stable, and musical sound reproduction.

• The design is praised for its simplicity, durability, and excellent engineering quality.

Construction and Dimensions:

• Plinth with walnut-grained finish.

• Transparent tinted plastic dust cover.

• Dimensions approximately 426 mm (W) x 340 mm (D) x 160 mm (H).

• Weight around 6.4 kg (14 lbs).

Additional Features:

• Supplied with accessories such as a 45 rpm adapter, lubricating oil, screwdriver for cartridge installation, and stylus pressure gauge.

• The turntable has a strong following and is considered a classic, with many users reporting excellent sound quality even decades after manufacture.

• Often paired with cartridges like the Shure M91.

• The design inspired many later turntables and remains a benchmark for belt-drive systems.