TOPPING Mini 300 Fully Balanced Power Amplifier

TOPPING Mini 300 Power Amplifier

The TOPPING Mini 300 is a fully balanced Class-D power amplifier that blends precision, power, and balance in a compact desktop footprint. It delivers 140W per channel into 4Ω with astonishingly low distortion – less than 0.0005% THD+N at 8Ω/5W – and a quiet 124dB SNR that keeps the background utterly black. Whether driving bookshelf speakers in your office or powering monitors on your desk, the Mini 300 brings clarity, composure, and control to every listening session.

Fully Balanced Class-D Architecture

The Mini 300 runs a fully balanced Class-D circuit in which each channel has its own complete amplification path, eliminating crosstalk and rejecting external noise before it touches your speakers. The result is an ultra-quiet floor – 124dB SNR and less than 15µVrms of noise – so the only thing you hear is the music itself.

Power That Fits Anywhere

At just 6.5 inches wide, the Mini 300 slips easily into desktop rigs or nearfield listening stations. Despite the small size, it pushes 140W x 2 into 4Ω, plenty to drive demanding passive speakers with headroom to spare.

Precision That Is Audible

At 5W into 8Ω, total harmonic distortion plus noise measures below 0.0004% – vanishingly low, translating to clean transients, stable imaging, and lifelike dynamics even at low volumes.

Auto-On Convenience with 12V Trigger

The 12V trigger input lets the Mini 300 power on and off in sync with your DAC or preamp – no reaching behind your stack or fumbling for switches. Once connected, it wakes up and shuts down with your system.

Dual Inputs: Balanced and Unbalanced

The rear panel accepts both balanced TRS and unbalanced RCA inputs, no adapters needed. Balanced inputs offer better rejection of interference for longer cable runs, while RCA keeps compatibility with everyday sources. Flip the front switch between BAL and SE to match your source.

Safe, Silent, Reliable

Power on and off are handled quietly, with protection circuitry guarding against overcurrent and overheating. The all-aluminum chassis not only looks refined but also doubles as a heat sink, with bottom and side vents that quietly manage thermals during long listening sessions.

Specifications

• Amplifier Architecture: Fully balanced Class-D amplification
• Output Power (BAL): 140W x 2 @4Ω (THD+N<10%); 125W x 2 @4Ω (THD+N<1%); 85W x 2 @8Ω (THD+N<10%); 65W x 2 @8Ω (THD+N<1%)
• THD+N @1kHz (A-wt): <0.0005% (BAL) / <0.0006% (SE) @4Ω 5W
• THD+N @8Ω 5W: <0.0004%
• SNR @MAX OUT 1kHz (A-wt): 124dB (BAL) / 121dB (SE)
• Dynamic Range @1kHz (A-wt): 124dB (BAL) / 121dB (SE)
• Frequency Response: 20Hz-40kHz (±0.3dB)
• Output Level: 65Vpp @4Ω / 68Vpp @8Ω
• Noise (A-wt): <15µVrms
• Channel Crosstalk @1kHz: -106dB (BAL) / -90dB (SE)
• Input Sensitivity: 2.6Vrms (BAL) / 1.3Vrms (SE)
• Gain: 19.2dB (BAL) / 25.0dB (SE)
• Channel Balance: 0.1dB
• Load Impedance: 4–8Ω
• Inputs: Balanced TRS + unbalanced RCA
• Trigger: 12V trigger input for auto power on/off
• Chassis: All-aluminum in three finishes (Black/Silver/White) with cooling vents
• Protection: Overcurrent and thermal protection

What's Included

• TOPPING Mini 300 amplifier
• AC power cable
• User manual and documentation