Rolls MA255 Compact Class-D Stereo Line Mixer/Amplifier

Rolls MA255: Compact Class-D Amplifier With a Four-Input Line Mixer

The Rolls MA255 is a compact Class-D stereo mixer/amplifier that combines a four-input line mixer with 20 watts per channel in a small, cool-running box. It exists for installs that need to blend several line-level sources and amplify them from a tiny footprint, such as background-music systems and projector-speaker setups. Where its sibling MA252 adds an XLR mic input, the MA255 focuses on line sources, offering four stereo RCA inputs plus a 3.5mm jack for maximum source mixing. Its efficient Class-D amplifier runs cool enough to mount in enclosed spaces, and it ships with a 24-volt supply. For a room that needs to mix multiple audio sources and drive ceiling speakers from a hidden box, the MA255 is built for the job.

20 Watts Per Channel, Efficient and Cool

The MA255 delivers 20 watts per channel into 4-ohm speakers from an efficient Class-D amplifier that is about 85 percent efficient. Class-D amplification switches its output stage rapidly instead of dissipating power as heat, which is why the unit stays cool and needs no fan. Its specified performance includes total harmonic distortion around 0.05 percent and a 20 Hz to 25 kHz bandwidth, so the amplification stays clean and full-range. Twenty watts per side comfortably drives a pair of ceiling or bookshelf speakers at room-filling background and foreground levels. For an install that needs clean, quiet, cool-running power in a small package, the MA255's efficient amplifier is the foundation.

Four-Input Line Mixer for Multiple Sources

The MA255 provides a four-channel line mixer with four stereo RCA inputs plus a 3.5mm jack, built to blend several program sources at once. Each RCA pair accepts a media player, a tuner, a computer feed, or another line source, and the mixer sums them into the amplified stereo output. Having four dedicated stereo inputs means an installer can leave multiple sources permanently connected and simply ride their levels, rather than swapping cables. The extra 3.5mm input adds a quick connection for a phone or laptop. For a venue that switches among several music and program sources through the day, that four-input mixing capacity is what makes the MA255 flexible where a single-input amp would not be.

Low-Heat Build for Enclosed Spaces

The MA255's cool-running Class-D design lets it mount in tight, enclosed locations that would overheat a conventional amplifier. Because it wastes little energy as heat, it can sit in a ceiling near a projector, inside a cabinet, or behind a display without ventilation clearance or a fan. That fanless, silent operation keeps it unobtrusive in a classroom, boardroom, or retail space where noise would be distracting. Mounting flexibility like this is often what decides whether an amplifier can be hidden cleanly at all. For an integrator placing audio hardware out of sight, the MA255's low-heat build opens up the locations a hotter amp cannot use.

Compact Metal Chassis With Included Power Supply

The MA255 is built in a compact all-metal chassis measuring 6.75 by 3.5 by 1.5 inches and weighing about a pound, powered by an included 24-volt supply. Its metal body withstands the demands of a permanent install rather than flexing like a consumer amplifier. The small footprint means it tucks into ceilings, cabinets, and shallow racks where space is scarce. Shipping with a matched 24-volt power supply means it arrives ready to install with no separate power to source. For an integrator, a rugged, tiny, self-powered amplifier is exactly what makes a clean hidden installation quick and reliable.

Background Music and Projector-Speaker Systems

The MA255 is built for spaces that need to mix multiple line sources and drive speakers from a concealed box. Classrooms and boardrooms use it to power ceiling or projector speakers while blending a computer, a media player, and other program feeds, and small venues run multi-source background music through it. Retail and office spaces mix several audio sources into a distributed pair of speakers, keeping every source connected and ready. Because it offers four line inputs, cool operation, and a hideable chassis, it suits these line-level installs better than a mic-focused amp. For any system built around mixing and amplifying several sources in a small space, the MA255 is the right tool.