Mackie SPM400 M20 Threaded Adjustable Speaker Pole for Powered Subwoofers

Mackie SPM400: The Steel Pole That Turns a Sub and a Top Into One Full-Range PA

The Mackie SPM400 is the connecting piece that takes a powered subwoofer and a powered top and makes them a single, intentional system. It threads into the M20 socket on the top of your Mackie sub, then carries your main speaker up to ear and coverage height on a rigid steel column. Instead of a sub on the floor and a top on a separate tripod eating up space and cable, you get one vertical stack that loads in fast, projects further, and looks like a real rig. For mobile DJs, gigging bands, and event hosts, it is the small part that makes the big difference in how a PA sets up and how it sounds.

Why Getting the Top Speaker Off the Floor Changes Everything

A full-range top sitting on the ground throws most of its sound into the legs and backs of the front row. Lift it on the SPM400 and the high and mid frequencies clear the crowd, reaching the back of the room with the clarity the speaker was built to deliver. The pole adjusts from 30 inches to 49 inches with a single twist-lock knob, so you can drop it low for a coffee-shop set or run it tall for a packed dance floor. No shims, no stacking road cases, no guessing - just dial the height and lock it.

Built Like Touring Hardware: Steel, M20 Threads, and a 100 lb Hold

This is not a thin telescoping rod. The SPM400 is steel, with an M20 threaded base that bites into the subwoofer socket for a connection that does not rattle or spin during a set. The top accepts any Mackie loudspeaker with a standard 1.378-inch pole opening, and the column is rated to carry a full-size powered top up to roughly 100 pounds. At 54.7 inches fully extended and 3.5 pounds on its own, it adds reach without adding meaningful load-in weight.

One Pole, the Whole Mackie Sub Lineup

The SPM400 is not locked to a single subwoofer. It fits the Thump15Sv4 and Thump18Sv4, the DRM18S, the SR18S, and the battery-powered ThumpSub GO - so the pole you buy for today's rig still works when you upgrade the sub or add a second system. If your top has a pole socket and your sub takes M20, the SPM400 bridges them.

Who the SPM400 Is For

If you are a mobile DJ or solo performer building a sub-and-tops PA, this is the part that completes it - one purchase, one connection, a stack that sets up in seconds. If you are upgrading from a pair of speakers on tripods, the SPM400 gets your main up high while the sub anchors the low end on the floor, freeing up space and tightening the sound. And if you are comparing poles, the spec that matters is the rigid M20 steel build rated to 100 pounds: this holds a real powered top, not just a tiny satellite.