Skip to main content

Splitter

Seismic Audio SA-RMSS-24 Mic Splitter

Twenty-four channels of transformer-isolated splitting in a 4U chassis. Lands in the gap between the 16-ch SA-RMSS-16 (full band) and the 32-ch SA-RMSS-32 (festival-grade headroom): typical use is a six- or seven-piece band with horns or a multi-keys rig where 16 channels would require the engineer to make hard choices about what gets a monitor split.

Compare

Photos

Manufacturer product photography — the drawn faceplate stays true to panel layout; these show the hardware itself.

Photo: Seismic AudioClick to zoom
Documented outputs
4848 destination connections
Documented inputs
24Based on documented inputs
Rack space
4UBuilder checks available rail space
Power draw
0WVerified passive · no AC required
Catalog estimate
~$849Use retailer rows for current price and stock

01 · What it does—and what that changes in your rig.

Product overview

Start with the payoff, then work through how it functions, where it fits, and the details that change a real build.

The payoff

Splitter decisions, organized around the whole rig.

The SA-RMSS-24 sits at the practical center of Seismic Audio's rack-mount splitter line — 24 channels of transformer-isolated splitting in a 4U chassis for $849. Its job is straightforward and non-negotiable: take every mic and line input from the stage and give FOH and monitors their own independent, isolated feed of each signal. The transformer isolation is what separates this from a passive Y-split — each isolated output breaks the ground path between consoles, which means a ground loop on the FOH side stays on the FOH side and doesn't crawl into the monitor world.

Documented outputs
4848 destination connections
Documented inputs
24Based on documented inputs
Rack space
4UBuilder checks available rail space
INPUTS / SPLITSSEISMICSA-RMSS-24Mic Splitter
Seismic Audio product panel4U · 0W
Function

How it works in the path

In practice, 24 channels lands you comfortably in a six- or seven-piece band with horns, a multi-keys rig with several sources, or any setup where a 16-channel unit would force you to choose which inputs skip the split. The chassis draws zero power, so it adds nothing to your power budget and can sit on a non-switched outlet without concern. At 7.7 kg and 200 mm deep it's dense but not unreasonable — a standard 12U shelfed rack handles it without drama. The direct outputs pass signal without touching the transformers, so one console sees the unaltered feed while the isolated outputs serve the other.

Best fit

Where it earns its place in the rack

This unit is the right call for a monitor engineer who has outgrown 16 channels but doesn't need the 32-channel headroom — or the freight weight — of a festival-grade box. If your input count reliably sits between 17 and 24, this is the cleanest fit. If you're regularly at 25 or above, step up; half-measures with splitter capacity tend to surface at the worst moment. Engineers running fully digital splits via a stagebox who only occasionally go analog should think carefully about whether a passive transformer splitter at any channel count is the right tool, or whether a smaller utility splitter handles the edge cases better.

In the rack

Details worth deciding before load-in.

  • Route direct outputs to whichever console holds phantom power responsibility for the stage — typically FOH — since phantom passes through the direct path and not the isolated outputs on transformer-split designs.
  • Label both the input row and the two output rows with the same channel numbering before the gig; 72 XLR connectors on one faceplate will cost you real time at load-in if the labeling isn't done at home.
  • At 4U and 7.7 kg, place this toward the bottom third of the rack to keep the center of gravity low, especially in a shelfed touring rack that gets tilted on dollies.
  • If you're splitting to a broadcast or recording truck, use the isolated outputs for that feed — the transformer barrier protects your stage signal from whatever ground reference the truck brings to the party.

02 · Know the whole path before you buy.

Signal path

Learn the route as a block diagram: source, product function, transport, and destination. Select any block to see what enters, what changes, and what leaves.

Interactive block diagramAuto-looping · hover, focus, or tap to hold a stage
Port-type signalProduct functionSystem boundary
Follow one signal from source to destination

Each block answers the same three questions: what arrives, what changes here, and what leaves.

01 · Source · selected
01 · Source

24 documented inputs

XLR female

Arrives as
24 documented inputs
Connector
XLR female
Signal
analog audio

03 · What this product asks of the rest of the system.

Compatibility

Treat connector names as the start of the check—not the answer. These are the boundaries that determine a complete working path.

Best fit · Splitter

Use it when 4U and 200 mm of depth fit the case.

Plan the companion path

Complete the path with upstream and downstream gear that matches connector, direction, signal type, protocol, and wiring standard.

Connector boundary

Documented connectors: XLR female, XLR male. Match connector, direction, and signal type—not shape alone.

04 · Every connector, grouped by job.

I/O ports

Switch the product view and the documented port inventory updates with it—hardware and data stay side by side.

Every connector, grouped by job.

Switch panels to keep the hardware view and the documented port list in sync.

Front panel
INPUTS / SPLITSSEISMICSA-RMSS-24Mic Splitter
Rear panel
Seismic AudioSA-RMSS-24
All documented ports for Seismic Audio SA-RMSS-24 Mic Splitter
PortPanelConnectorDirectionSignalChannels
Input 1 (XLR)frontXLR female inputanalog audio—
Input 2 (XLR)frontXLR female inputanalog audio—
Input 3 (XLR)frontXLR female inputanalog audio—
Input 4 (XLR)frontXLR female inputanalog audio—
Input 5 (XLR)frontXLR female inputanalog audio—
Input 6 (XLR)frontXLR female inputanalog audio—
Input 7 (XLR)frontXLR female inputanalog audio—
Input 8 (XLR)frontXLR female inputanalog audio—
Input 9 (XLR)frontXLR female inputanalog audio—
Input 10 (XLR)frontXLR female inputanalog audio—
Input 11 (XLR)frontXLR female inputanalog audio—
Input 12 (XLR)frontXLR female inputanalog audio—
Input 13 (XLR)frontXLR female inputanalog audio—
Input 14 (XLR)frontXLR female inputanalog audio—
Input 15 (XLR)frontXLR female inputanalog audio—
Input 16 (XLR)frontXLR female inputanalog audio—
Input 17 (XLR)frontXLR female inputanalog audio—
Input 18 (XLR)frontXLR female inputanalog audio—
Input 19 (XLR)frontXLR female inputanalog audio—
Input 20 (XLR)frontXLR female inputanalog audio—
Input 21 (XLR)frontXLR female inputanalog audio—
Input 22 (XLR)frontXLR female inputanalog audio—
Input 23 (XLR)frontXLR female inputanalog audio—
Input 24 (XLR)frontXLR female inputanalog audio—
Direct Out 1 (XLR)rearXLR male outputanalog audio—
Direct Out 2 (XLR)rearXLR male outputanalog audio—
Direct Out 3 (XLR)rearXLR male outputanalog audio—
Direct Out 4 (XLR)rearXLR male outputanalog audio—
Direct Out 5 (XLR)rearXLR male outputanalog audio—
Direct Out 6 (XLR)rearXLR male outputanalog audio—
Direct Out 7 (XLR)rearXLR male outputanalog audio—
Direct Out 8 (XLR)rearXLR male outputanalog audio—
Direct Out 9 (XLR)rearXLR male outputanalog audio—
Direct Out 10 (XLR)rearXLR male outputanalog audio—
Direct Out 11 (XLR)rearXLR male outputanalog audio—
Direct Out 12 (XLR)rearXLR male outputanalog audio—
Direct Out 13 (XLR)rearXLR male outputanalog audio—
Direct Out 14 (XLR)rearXLR male outputanalog audio—
Direct Out 15 (XLR)rearXLR male outputanalog audio—
Direct Out 16 (XLR)rearXLR male outputanalog audio—
Direct Out 17 (XLR)rearXLR male outputanalog audio—
Direct Out 18 (XLR)rearXLR male outputanalog audio—
Direct Out 19 (XLR)rearXLR male outputanalog audio—
Direct Out 20 (XLR)rearXLR male outputanalog audio—
Direct Out 21 (XLR)rearXLR male outputanalog audio—
Direct Out 22 (XLR)rearXLR male outputanalog audio—
Direct Out 23 (XLR)rearXLR male outputanalog audio—
Direct Out 24 (XLR)rearXLR male outputanalog audio—
Isolated Out 1 (XLR)rearXLR male outputanalog audio—
Isolated Out 2 (XLR)rearXLR male outputanalog audio—
Isolated Out 3 (XLR)rearXLR male outputanalog audio—
Isolated Out 4 (XLR)rearXLR male outputanalog audio—
Isolated Out 5 (XLR)rearXLR male outputanalog audio—
Isolated Out 6 (XLR)rearXLR male outputanalog audio—
Isolated Out 7 (XLR)rearXLR male outputanalog audio—
Isolated Out 8 (XLR)rearXLR male outputanalog audio—
Isolated Out 9 (XLR)rearXLR male outputanalog audio—
Isolated Out 10 (XLR)rearXLR male outputanalog audio—
Isolated Out 11 (XLR)rearXLR male outputanalog audio—
Isolated Out 12 (XLR)rearXLR male outputanalog audio—
Isolated Out 13 (XLR)rearXLR male outputanalog audio—
Isolated Out 14 (XLR)rearXLR male outputanalog audio—
Isolated Out 15 (XLR)rearXLR male outputanalog audio—
Isolated Out 16 (XLR)rearXLR male outputanalog audio—
Isolated Out 17 (XLR)rearXLR male outputanalog audio—
Isolated Out 18 (XLR)rearXLR male outputanalog audio—
Isolated Out 19 (XLR)rearXLR male outputanalog audio—
Isolated Out 20 (XLR)rearXLR male outputanalog audio—
Isolated Out 21 (XLR)rearXLR male outputanalog audio—
Isolated Out 22 (XLR)rearXLR male outputanalog audio—
Isolated Out 23 (XLR)rearXLR male outputanalog audio—
Isolated Out 24 (XLR)rearXLR male outputanalog audio—

Showing 72 of 72 documented physical ports. Scroll to review the remaining rows.

05 · Compare the decision, not just the price.

Alternatives

The rows are organized around fit, power, I/O, and system role so a cheaper unit cannot hide a more expensive workflow.

Compare
Seismic Audio SA-RMSS-24 Mic Splitter
Seismic Audio SA-RMSS-16 Mic Splitter
Seismic Audio SA-RMSS-32 Mic Splitter
SEISMIC
Fit📐 4U📐 3U📐 5U📐 2U
Power⚡ 0W⚡ 0W⚡ 0W⚡ 0W
Weight⚖️ 17.0 lb⚖️ 11.9 lb⚖️ 22.9 lb⚖️ 7.1 lb
I/O🔌 72🔌 48🔌 96🔌 24
Estimate💵 ~$849💵 ~$599💵 ~$1,099💵 ~$349
Deep diveCurrent selectionFull comparison →Full comparison →Full comparison →

06 · Resolve the questions that can change the purchase or build plan.

Planning questions

Short, source-backed answers surface rack fit, power, cabling, and connection details before they become surprises.

How will the Seismic Audio SA-RMSS-24 Mic Splitter affect rack fit and case depth?

It occupies 4U. Its documented depth is 200 mm.

How much power does the Seismic Audio SA-RMSS-24 Mic Splitter draw?

It is verified passive and requires no AC power.

What connections does the Seismic Audio SA-RMSS-24 Mic Splitter have?

72 documented physical ports, including Input 1 (XLR), Input 2 (XLR), Input 3 (XLR), Input 4 (XLR), Input 5 (XLR), Input 6 (XLR).

07 · See this unit inside a real rack plan.

Builder preview

Placement is only the start. Builder checks space · depth · weight, power headroom, dependencies, and compatible signal paths around this exact catalog item.Open in Builder
SA-RMSS-24 Mic Splitter positioned in a rack planA simplified plan shows the unit taking 4 rack units, with its documented connection path continuing to a planned destination.Seismic AudioSA-RMSS-24CONNECTED GEARnext signal destination4U · 200 mm deep

08 · Related gear, in the order you may need it.

Planning guides for splitter systems.