SMSL VMV A1 PRO Gallium Nitride Power Amplifier — 160W×2 Stereo / 400W Mono Class D Speaker Amp

Regular price: $3,958.71
Regular price
Sale price: $3,958.71

Shipping calculated at checkout.

Product variants:

Product Highlights

Infineon Gallium Nitride (GaN) FET power stage with 1 MHz switching frequency

160W x 2 stereo output into 4 Ohm; 400W bridged mono into 4 Ohm

TI PGA2311 digitally controlled analog volume chip with ultra-low THD

RCA and XLR inputs for stereo and mono BTL operation modes

Audiophile-grade internal components with gold-plated connectors throughout

THD+N of 0.003% with 109 dB SNR and up to 111 dB dynamic range

Built-in overheat, overcurrent, and short-circuit protection

Compact CNC-machined chassis: 210 x 47.6 x 201.6 mm, 1.56 kg

A New Kind of Power Amplifier

The SMSL VMV A1 PRO is a compact yet commanding power amplifier built around next-generation Gallium Nitride (GaN) transistor technology. By switching at frequencies up to 1 MHz — far beyond what traditional silicon can achieve — the A1 PRO delivers ultra-clean, full-bandwidth sound with vanishingly low distortion. Whether you are driving a pair of reference stereo speakers or configuring a bridged mono setup for maximum headroom, this amplifier brings benchmark-grade performance to a desktop-friendly footprint.

Gallium Nitride Technology: Faster, Cooler, Cleaner

At the heart of the A1 PRO lies a GaN power stage built around Infineon transistors. Gallium Nitride is widely regarded as one of the most significant advancements in power amplification in decades. Unlike conventional silicon FETs, GaN devices switch with dramatically less dead time — the micro-moments when both output transistors are momentarily off. This ultra-fast switching virtually eliminates crossover distortion, preserves transient accuracy, and runs cooler, allowing the A1 PRO to deliver substantial output power without a massive heatsink.

Stereo and Mono Flexibility

The A1 PRO effortlessly adapts to your system. In stereo mode it delivers 160W × 2 into 4Ω (85W × 2 into 8Ω) — more than enough for most bookshelf and floorstanding speakers. For those seeking even greater authority, switch to bridged mono mode and unlock 400W into 4Ω (250W into 8Ω). Use a pair of A1 PROs in dual-mono configuration to quadruple your power reserves and drive the most demanding loudspeaker loads with absolute control.

Precision Volume Control with the TI PGA2311

Volume adjustment is handled by the Texas Instruments PGA2311, a digitally controlled analog volume chip renowned for its channel matching and vanishingly low THD. If you have ever struggled with volume drift, channel imbalance at low listening levels, or noise introduced by lesser potentiometers, the PGA2311 is a genuine upgrade. It ensures precise, repeatable level control across the entire range without degrading the signal path.

Audiophile-Grade Components Throughout

SMSL has equipped the A1 PRO with a carefully curated internal bill of materials: premium-grade capacitors, gold-plated RCA and XLR input jacks, and gold-plated speaker binding posts. These are not boutique indulgences — they directly contribute to signal integrity, long-term reliability, and consistently low contact resistance at every connection point.

Benchmark Performance, Measured and Heard

The A1 PRO's measurements speak for themselves:

THD+N of just 0.003% — distortion remains inaudible even during complex passages
Signal-to-noise ratio of 109 dB — the noise floor is effectively silent
Dynamic range up to 111 dB — micro-detail and macro-slam coexist without compression
Channel separation of 75 dB — stereo imaging remains precise and stable

Dedicated Audio-Grade Power Supply

The integrated switching power supply is purpose-built for audio performance. It delivers clean, stable energy that keeps pace with the amplifier's dynamic demands while drawing less than 0.5W in standby. You can leave the A1 PRO in your rack without worrying about heat buildup or wasted electricity.

Comprehensive Protection Suite

SMSL has implemented full-spectrum protection circuitry covering overheat, overcurrent, and short-circuit conditions. While you are unlikely to trigger any of these safeguards during normal operation, they provide essential peace of mind — especially when running the amplifier in high-output mono mode with expensive loudspeakers.

Balanced and Unbalanced Connectivity

Both RCA (unbalanced) and XLR (balanced/mono) inputs are provided, giving you the flexibility to integrate the A1 PRO into virtually any system topology. Gold-plated binding posts accept banana plugs, spades, or bare wire for a secure, low-impedance speaker connection.

Ideal System Pairing

The A1 PRO pairs exceptionally well with the SMSL D1 PRO DAC (or any high-resolution source with balanced outputs), creating a refined decoding-plus-amplification chain that maximizes detail retrieval and dynamic expression from your loudspeakers.

Specifications