Palmer Macht 402

A modern power stage, tailored for preamp + speaker cabinet rigs

The Palmer MACHT 402 fits naturally into the evolution of guitar setups: a preamp (or modeler) to shape the tone, then a reliable and lightweight power amplifier to drive a real guitar cabinet on stage or in the studio. Where a PA amplifier might sound too "cold" or too linear, the MACHT 402 aims for a response more familiar to guitarists, with Hi/Low controls calibrated for the guitar's spectrum and attack.

Its Class D design and switching power supply increase efficiency and portability without sacrificing impact. The result: a very coherent solution for building a simple, powerful rack that's ready to handle rehearsals and tours.

Who is the Palmer MACHT 402 for, and in what contexts does it make a difference?

The MACHT 402 is ideal if you play with a rack preamp, a preamp pedalboard, a multi-effects unit, or a modeler and want to drive one or two guitar cabinets with authority. In stereo, it becomes an excellent companion for sounds with ping-pong delays, wide reverbs, chorus, or for a wet/dry setup. In Bridge mode, it transforms into a very powerful "mono block" for a single cab.

Regarding styles, it's clearly a versatile "pro" tool: rock, metal, prog, pop, but also dynamic clean and crunch, as long as your preamp provides character. For example, guitarist Paul C. Wilson (LANDMVRKS) has been seen using it to power a modeler, precisely to maintain a powerful and minimally colored sound.

Important: the MACHT 402 does not connect directly to a guitar. Always place a preamp, modeler, or effect/preamp pedal between the guitar and the power amp.

Controls, modes, and features: designed for the field

In daily use, the MACHT 402 stands out with very "musician-friendly" ergonomics: you first adjust the level using the 3-position input sensitivity selector (handy depending on whether you're coming from a powerful preamp, a multi-effects unit, or a more modest chain), then you manage behavior in real situations with the limiter and rumble filter (useful for taming unwanted low-end noise, resonant stages, and "smear" effects on some cabinets).

The mode selector (stereo, parallel, Bridge) lets you switch from a stereo pedalboard to a very powerful mono rig without changing amps. The Ground Lift helps reduce ground hum when multiple devices are connected (rack, interface, modeler, pedalboard power supply). Finally, the status LEDs (signal, clip, protect, etc.) are true allies for quick and clean setup, especially live.

Sound

A "guitar" power amp must do more than just push volume: it must respect the attack, maintain tightness in the lows, and stay clear as levels rise. The MACHT 402 offers a solid reproduction, with a fast response and a sense of control that suits modern sounds (heavy palm mutes, low tunings) as well as more open tones. The Low and High controls, optimized for guitar, allow you to adjust the cabinet balance without feeling like you're "mixing" as on a PA system: it stays in an amp logic, reactive and direct.

Depending on your preamp/modeler, you can either use it fairly neutrally (to let the preamp's character shine) or take advantage of its adjustments to better "marry" a preamp simulation with a real cab. In short: an excellent foundation for a tight, clear, and powerful sound, with enough headroom to adapt to very different cabinets.

Technical specifications

Category	electric preamp	EQ	2 channels
Format	Rack	Headphone output	No
Effects loop	No	Color	Beige
Number of channels	2	Power output	400 W

Type	stereo power amplifier for guitar, 19-inch rack format	Speaker output connectors	6.35 mm Jack, Speakon compatible
Output power (1 kHz, 4 Ohms)	2 x 200 W	Controls	Volume, Low, High, Sensitivity, Limiter, Mode, On/Off, Ground Lift
Output power (1 kHz, 8 Ohms)	2 x 100 W	Indicators	Signal, Clip, Protect, Power, Mode
Output power (1 kHz, 8 Ohms, Bridge mode)	400 W	Protection circuits	DC voltage, short circuit, soft-start delay, overheating, overvoltage
Amplification class	Class D	Cooling	quiet fan
Frequency response	20 Hz - 20,000 Hz	Width	482 mm
THD	less than 0.1%	Height	44 mm
Gain	32 dB / 26 dB / 28 dB	Depth	244 mm
Input sensitivity	0.68 V / 1.4 V / 1.2 V	Weight	3.8 kg
Line inputs	2	Mains voltage	115 V AC / 230 V AC (switchable)
Line input connectors	6.35 mm Jack, Cinch (RCA)	Full load consumption	470 W (approx. 2040 mA at 230 V, or approx. 4090 mA at 115 V)
Speaker outputs	2