On-Stage Posi-Lok Sidemount Boom Review

A Side-Mount Boom, Not a Stand Replacement

My read of the On-Stage Posi-Lok Sidemount Boom is simple: this is a stand accessory, not a microphone and not a complete floor stand. The MSA9508 is meant to add a side-positioned mic point to a stand you already have, so I would only consider it if the rest of the setup is already sorted.

At 13.4 ounces, it sits firmly in lightweight accessory territory. The listed dimensions are 65 x 2 x 16 inches, which tells me this is long, narrow stand hardware that needs sensible placement rather than brute-force treatment. The color is black, so visually it should stay fairly discreet on stage or in a small recording space. The recorded material type is nylon, and that matters if you are specifically shopping for all-metal stand hardware.

Where I Think the MSA9508 Makes Sense

I would look at this kind of sidemount boom when the goal is to add a microphone position without putting another full stand on the floor. That could mean a utility mic near a workstation, a secondary mic around a rehearsal setup, or a vocal mic placed beside another stand-based rig.

The appeal is floor-space control. A side boom lets the microphone move toward the source while the main stand stays out of the way. Around keyboards, percussion, amps, desks, and cramped rooms, that can be the difference between a workable setup and a tangle of tripod legs.

That said, I would not treat this as a universal support solution. A side-mounted arm creates leverage, and leverage asks more of the main stand. Before ordering, I would check the stability of the stand it will mount to, the weight of the mic, the clip or adapter being used, and how the cable will be routed.

The Limitation I Would Not Ignore

The honest limitation is balance. Because the microphone position sits away from the stand’s center line, the setup is only as trustworthy as the stand supporting it. I would be cautious with heavier microphones, bulky shock mounts, or any situation where the stand base is already marginal.

The nylon listing is also a divider. If I were buying for rugged, permanent, heavy-duty studio mounting, I would skip this and look for a more substantial boom stand or dedicated studio arm. If I wanted a lightweight black add-on for modest mic placement from an existing stand, the MSA9508 would make more sense.

• Best suited for: musicians, podcasters, rehearsal rooms, and small studios that need an extra mic position without adding another full stand.
• Who should skip it: anyone needing a standalone stand, maximum load confidence, or an all-metal heavy-duty boom solution.

As a spec-sheet recommendation, I see the On-Stage MSA9508 as a practical space-saving accessory, provided the main stand is stable enough for the offset load.