Palmer MACHT 402 – stereo 19” guitar power amplifier The Palmer MACHT 402 is a stereo guitar power amplifier designed for musicians who need high output power, modern efficiency, and seamless integration with their stage or studio setup. Operating in Class D, it delivers 2 x 200 W at 4 Ω and 400 W in bridged mode at 8 Ω, making it suitable for both stereo and mono configurations. With its compact 19” rack format, the unit can be easily integrated into your rig alongside preamps, modelers, or pedalboards.

Product features This power amp combines efficiency with a response tailored specifically for guitar signals. It features dedicated Hi and Low tone controls optimized for guitar applications, allowing precise shaping of your sound. You also get a 3-step input sensitivity selector, built-in limiter, and a low-frequency filter, ensuring better control over dynamics and improved clarity in live performance situations.

Power, control, and uncompromised guitar tone If you're building or expanding your guitar rig, this unit offers excellent flexibility. It works perfectly with guitar preamps, compact amps, modelers, or multi-effects processors. Designed to work with virtually any guitar cabinet, it adapts easily to your setup. In everyday use, you’ll appreciate its fast startup, stable performance, and quiet fan that ensures proper cooling without unnecessary noise. Status LEDs provide clear monitoring of signal, clipping, protection, and operation modes, while intuitive controls and switches allow quick adjustment to match your signal source. Whether in rehearsal, live performance, or professional rack systems, the MACHT 402 ensures reliability and consistent results.

Applications This unit is ideal as a power amp for setups based on guitar preamps, modeling processors, multi-effects units, and pedalboards. It’s a great choice for musicians building compact rack systems, technicians looking for a lightweight and powerful solution, and users replacing heavier traditional amplifiers with modern alternatives. It can operate in stereo for wider sound or bridged mode for higher mono power. Please note: the unit is not designed for direct guitar connection. A preamp, modeler, or effects unit is required between the guitar and the power amp.

Technical specifications Product type: guitar amplifier / stereo power amp Output power at 4 Ω: 2 x 200 W Output power at 8 Ω: 2 x 100 W Bridged power at 8 Ω: 400 W Amplifier class: D Frequency response: 20–20000 Hz THD: < 0.1% Voltage gain: 32 dB / 26 dB / 28 dB Input sensitivity: 0.68 V / 1.4 V / 1.2 V Protections: DC, short circuit, soft start, thermal, overvoltage Controls: ground lift, High, Limiter, Low, Mode, On/Off, Sensitivity, volume Indicators: Clip, Mode, Power, Protect, Signal Inputs: 2 line inputs Input connectors: 6.3 mm jack, RCA Outputs: 2 speaker outputs Output connectors: 6.3 mm jack, Speakon compatible Cooling: low-noise fan Power supply: switching power supply Power consumption (max): 470 W Operating voltage: 115 V AC / 230 V AC Dimensions: 482 x 44 x 244 mm Weight: 3.8 kg Build and design The 19” rackmount design ensures easy installation and reliable operation in both mobile and fixed setups. With a 1U height and only 3.8 kg weight, it’s highly portable. The Class D architecture reduces weight without sacrificing power, while the switching power supply, soft-start circuit, and quiet cooling system ensure stable performance even under demanding conditions.

What’s included The package includes the Palmer MACHT 402 power amplifier. The manufacturer does not specify additional accessories, so it is recommended to verify contents before purchase.

Why choose this model If you’re looking for a compact, powerful, and flexible guitar power amp, the MACHT 402 is a strong choice. It offers modern Class D efficiency, guitar-focused tone shaping, multiple protections, and rack convenience. It’s a reliable solution for rehearsal, stage, and professional touring setups.