Rolls MX310 MorMics 3-Channel Mono Microphone Mixer / Combiner with Phantom

Rolls MX310 MorMics: Combine Three Microphones Into One Output

The Rolls MX310 MorMics is a three-channel mono microphone mixer that combines three balanced XLR mics into a single mic- or line-level output, with per-channel phantom power and low-cut filtering. It is purpose-built for the common problem of getting several microphones into one input, whether that input is a camera, a recorder, or a paging system. Each of the three XLR channels has individually switchable phantom power and an individually switchable low-cut filter, and a stereo 1/8-inch aux input plus a 3.5mm stereo output handle consumer connections. In a compact 5.25 by 3.75 by 1.5-inch chassis, the MX310 turns a panel of microphones into one manageable feed. For interviews, panels, and multi-mic field work, it is the small mixer that combines the mics.

Three Balanced Mic Channels Summed to One Feed

The MX310 accepts three balanced XLR microphones and sums them to a single output available at mic or line level on XLR, with a 600 ohm input impedance. Combining several mics into one feed is exactly what a camera or field recorder needs when it has only one or two inputs but the scene has three talkers. Because the output can be set to mic or line level, it matches a camera's mic input or a mixer's line input without an external pad. A 50 dB line and 10 dB mic voltage gain range covers bringing the combined signal up to whatever the destination expects. For a panel discussion or a multi-mic interview feeding a single-input device, that three-into-one combining is the MX310's core job.

Individually Switchable +15V Phantom Power

Each MX310 mic channel provides individually switchable +15 VDC phantom power, so any combination of the three inputs can run condenser microphones. Phantom power feeds a condenser's internal electronics up the same balanced cable that carries its audio, with no separate supply at the mic. Fifteen volts runs the electret and small-diaphragm condensers common in field and interview work. Switching phantom per channel means you can mix condensers and dynamics freely, powering only the mics that need it. For a shoot that pairs a condenser lav with a dynamic handheld, per-channel phantom is what lets all three inputs coexist on one mixer.

Per-Channel Low-Cut Filtering

Each channel also carries an individually switchable low-cut filter set at -3 dB at 100 Hz to roll off low-frequency rumble. A low-cut, or high-pass, filter removes the handling thumps, wind, and stage rumble that live below the range of speech, cleaning up a voice channel before it reaches the mix. Applying the filter per channel lets you cut rumble on a handheld that gets bumped while leaving a stable lav untouched. Removing that low-end energy also preserves headroom that rumble would otherwise waste. For dialog and interview work where clean, intelligible voices matter, per-channel low-cut is what keeps the combined feed tight.

Aux Input and 3.5mm Output for Cameras and Computers

The MX310 adds a stereo 1/8-inch aux input and a separate 3.5mm stereo output for connecting cameras, computers, and earbuds alongside the pro XLR feed. The aux input folds a line-level source, such as a music bed or a return feed, into the mix without using a mic channel. The 3.5mm output sends the combined mix straight into a camera or computer input, or to earbuds for a quick check, matching the connectors those devices use. Having both a pro XLR output and a consumer 3.5mm output means the MX310 feeds a broadcast rig and a DSLR equally well. For a field kit that mixes pro and consumer gear, those extra connections make the MX310 versatile.

Compact, Rugged Build With External Power

The MX310 fits three mic channels into a rugged 5.25 by 3.75 by 1.5-inch chassis weighing about 1 pound, drawing just 20 mA from an external supply of up to 16 VDC. Low current draw and external power suit field use where the mixer may run off a battery pack or a small adapter for long stretches. A 0.05 percent typical THD+N and a 20 Hz to 20 kHz response keep the combined mics clean. The metal chassis stands up to the handling of ENG and location work. For a mixer that has to travel and survive, the MX310's compact, low-power build is made for the field.

Interviews, Panels, and Multi-Mic Field Work

The MX310 is built for combining multiple mics into a single feed for cameras or recorders, panel discussions and interviews, paging and announcement systems with several mics, and ENG multi-mic mixing into a camera input. A documentary crew can run three lavaliers into one camera input, each with its own phantom and low-cut. A paging system can combine several announcement mics into a single output to the amplifier. The consumer 3.5mm output makes it a natural front end for a DSLR or a computer. For any situation where several microphones have to become one clean feed, the MX310 is the compact combiner that does it.