The flagship of the 600 Series amplifiers, the № 631, is a fully differential, fully discrete, monaural amplifier powerhouse capable of driving virtually any loudspeaker with effortless dynamics and incredible sonic detail. Designed and built with Pure Path circuit design philosophy, the № 631 provides a deep, expansive soundstage with extremely accurate image placement.

Tectonic Industrial Design with Signature Red Accent Lighting

A design that pays homage to the legacy designs of previous generations of Mark Levinson, while adding fresh lighting and glass design elements for this next generation.

Proprietary approach to circuit design featuring fully-balanced architecture that delivers uncompromising musical purity and an engaging listening experience.

General Specifications

Input & Output Connectors

One, balanced XLR input; One, single-ended RCA input; Two Pairs, “Mark Levinson Hurricane” loudspeaker output binding posts

Control Connectors

Two, 3.5mm mono (tip/sleeve) mini plug trigger connectors. One input / One output, 3-12Vdc; One, USB-A (service use)

Dimensions (H x W x D)

20.6" x 12.0" x 20.6" (522.7mm x 305mm x 521.9mm)

Monaural Amplifier
• Pure Path circuit design featuring fully-balanced
architecture.
• Amplification: Class A/AB mono, 400W (8Ω), 800W (4Ω),
stable at 2Ω
• Analog inputs: XLR balanced and RCA unbalanced
connections