Give each retail screen its own media player on the store's Cat 6 network. Passive HDMI stops being reliable well before a 25 m run, and a splitter mirrors one image onto every screen, so four different layouts need four players. Ethernet carries each feed to 100 m, and one cloud account updates all four screens.
Four screens, four different messages, all changed without walking to each one: that job is decided at the player, not at the cable. Put one media player at each screen, give each player its own Cat 6 drop from a switch in the office, and manage all four from one cloud account. Two setups in common use fail this job on their own terms. A splitter drives every output with a copy of one signal, so four independent layouts are out of reach, and a passive HDMI cable is past its reliable length at a 25 m run. The wiring plan below carries the limits, a table that sorts four options, and a worked example for a store with exactly this floor plan.
Why a splitter cannot show four different messages
A splitter has one input and copies it to every output. Three screens showing the same picture is the splitter working correctly, not a fault to fix. Spreading one large canvas across two or more panels needs a video wall processor, which crops a single image instead of copying it; four independent layouts need four independent sources. For the routing options around a single source, the HDMI switch and splitter topology page covers how manual, automatic and powered designs behave.
A splitter keeps one honest role: four screens that must show one identical promo during a sale weekend, on runs short enough for passive cable. The moment each screen needs its own playlist, the splitter is out of the design.
The distance numbers that decide the wiring
Three limits settle a 25 m run:
- Passive HDMI: about 15 m at 1080p. Past that length the signal degrades into sparkles, dropouts and handshake failures, which is exactly what a long PC-to-screen run produces. At 4K60 the practical passive length falls to roughly 3 m, because a 4K60 signal moves about four times the data of 1080p through the same cable construction.
- HDBaseT: 100 m at 1080p over one Cat 6 run. The HDBaseT specification rates that distance, using an extender pair with power at both ends. Reach at 4K depends on the extender model, so match the pair's rated format to the screens before buying.
- Ethernet: a 100 m channel per Cat 6 run. The structured cabling standard (TIA-568) fixes the channel at 100 m, and a signage player uses a sliver of a gigabit link: content downloads run in bursts between playlists, so a wired gigabit drop per screen sits mostly idle.
At 25 m, passive HDMI is 10 m past its practical limit and both network-grade paths pass with margin. That comparison is the whole wiring decision, and the table below sorts the rest of it.
Four ways to drive four screens
| Setup | What the four screens show | 25 m run? | Remote changes? | Where it wins |
|---|---|---|---|---|
| Media player at each screen | Four independent layouts | Yes, Ethernet rates Cat 6 at 100 m | Yes, one cloud account | Own message per screen, updates from anywhere |
| One PC plus four HDMI extender pairs | Four independent PC outputs | Yes, HDBaseT rates 1080p at 100 m | Only by remote desktop | Desktop-built content, staff on site |
| One PC plus an HDMI splitter | One mirrored image on all four | No, passive HDMI tops out near 15 m | No | One identical promo everywhere, short runs |
| Smart TVs running built-in signage apps | Four independent layouts | No video run at all | Yes, one app per TV | No extra boxes when the panels are already smart |
Four players win the stated job and most retail jobs like it. Each screen has a player the size of a small book, a fault blanks one screen, and a swap is a two-minute job with a spare on hand.
A PC with extenders wins when the content is built and played on a desktop machine, when the screens also need to mirror a live desktop, or when the store already owns the PC and wants four independent outputs. The PC needs four video outputs, which on many machines means adding a quad-output graphics card, and the design adds four powered extender pairs, eight boxes in total.
A splitter wins only mirroring. Same promo, same picture, short runs, low cost.
Smart TV apps win on box count. No player to buy or power, but each TV carries its own app account and its own update behavior, so four screens means four logins and four sets of quirks.
Example: four screens, one office, 25 metres
Scenario: a fruit and vegetable store replaces four aging panels with 60-inch class screens in landscape. The office with the router sits 25 m from the farthest screen position, and viewing distances are 6 ft at the counter, 10 ft in the produce aisle and 12 ft at the entry wall.
- The long video run fails on length alone. The present layout asks passive HDMI for 25 m against a 15 m practical limit at 1080p, so the run is 10 m over. Sparkles and dropouts on such a setup are the expected result of the distance, and shortening the cable would mean moving the PC, which the floor plan does not allow.
- The network passes with 75 m of headroom. An 8-port gigabit switch in the office feeds one Cat 6 run to each player. The longest run is 25 m against a 100 m channel rating, so even a detour through a ceiling keeps every run inside the standard.
- Every HDMI jumper stays short. A 1.5 m jumper from player to panel sits under the 15 m 1080p limit and under the 3 m 4K60 limit, so even a 4K player reaches the panel with no extenders.
- The text passes at every position. The 12 ft entry wall needs 12 ÷ 30 = 0.4 in capital letters, using the FHWA planning figure of 30 ft of viewing distance per inch of capital height, or 0.6 in at the safer 20 ft per inch used for fast reading. A 60-inch 16:9 panel stands 29.4 in tall, so 1080 lines of picture give 1080 ÷ 29.4 ≈ 36.7 pixels per inch, and 0.6 in of capitals is 22 pixels. Set playlist headlines at 22 px capitals or taller and all three positions read. The screen size and viewing distance guide carries this math for other rooms.
Result: four independent playlists, no video cable longer than 1.5 m, every run inside its rating, and content changes from the office or from home.
What each screen needs at the wall
Each position needs four things, and the list repeats four times:
- Power. One mains outlet behind the panel runs the TV and the player, or two outlets if the circuit prefers it.
- One Cat 6 drop. From the office switch to the player at each screen, one run each. This answers the return-run question directly: no cable runs from screen to screen, and none runs back from screen to office. The player uses its drop to collect content and to report playback status, and the TV needs no network unless its own smart apps are in play.
- A short HDMI jumper. The player-to-panel lead from the example, 1.5 m, so the last video link never approaches a length limit.
- A mount rated for the panel. Match the mount's listed size class and weight maximum to the TV's stated weight, with the maximum above the TV. A 60-inch class panel is a two-person lift, not a one-person job.
The office side is one small switch, one router port and, if the content is built in-house, one PC with the CMS in a browser.
Changing content from one account
One cloud CMS account covers all four screens. Name each screen after its zone, entry, produce, counter and window, build one 1920×1080 landscape playlist per zone, and schedule each playlist by date and time of day. A landscape canvas built once at 1920×1080 plays on all four panels unchanged; the portrait and landscape content guide covers orientation planning. If a screen later moves to a 4K panel, confirm the player actually renders 4K output, because some players draw at 1080p regardless; the 4K player rendering article explains why.
Pick the CMS on one question: how many clicks from a promo photo to that photo on four named screens? Small-retailer signage guides converge on the same advice, that the system staff actually use beats the one with the longest feature list, because stale content costs a store more than a missing feature. Prefer a player that stores its schedule on the device, and treat that as a buying question rather than a spec-sheet number. Browser-based players behave differently from app players, and the web page signage player article lists what to check before committing.
When a screen shows live TV
Game-day channels sit outside a signage playlist, so give those screens a second video source. Most new panels carry at least two HDMI inputs: the player takes HDMI 1, a set-top box takes HDMI 2, and staff switch inputs when coverage starts. To automate the switching, check whether the TV and the player speak HDMI-CEC; the HDMI-CEC display control article covers the setting that turns screens on and off with the playlist.
The decision
Four screens, four layouts, changes from anywhere: one media player per screen, each on its own Cat 6 drop, a short jumper to each panel, all four screens on one cloud CMS account.
One PC that must stay in the loop: an HDBaseT extender pair on each run and four independent outputs from the PC.
One identical message on every screen: a splitter is enough, at short runs.
Old analog panels with no HDMI input: replace them. Converters add a box and a power supply without adding resolution.
Recommendation: run Cat 6 from an 8-port gigabit switch in the office to one media player at each screen, keep every HDMI jumper short enough to stay inside the passive cable limits above, and manage the four playlists from one cloud account. Take the extender-and-PC path only when a screen must show desktop-only content, and the splitter path only when all four screens must match.
If a fifth, smaller position appears, a counter card or a shelf-end strip, that is the panel-mount display class: integrated Android units from 10.1 to 23.8 inches that play images and video straight from a card with no subscription, under retail displays. Above the 60-inch target, we quote larger wall models through 75 inches per project, with software, ports, power and warranty confirmed in the quote, under the display range.
Questions
Can the old screens without HDMI inputs be kept?
Adapters exist for older analog inputs such as VGA and composite, one converter per screen. The picture still lands at the old panel's native resolution, video looks soft next to a new panel, and each converter is one more power supply and failure point in the chain. New panels with two HDMI inputs take the player and a set-top box with no converter in between.
Can one player drive two screens with different content?
Only a player with two independent video outputs can put different layouts on two screens, and that puts a second video cable back into the run. One player per screen keeps every video lead short, makes a swap a five-minute job, and a fault then blanks one screen instead of several.
Is Wi-Fi workable instead of pulling Cat 6 to each screen?
Yes, when the store's wireless reaches every screen position and carries each player's content downloads. Cable still wins where it can be pulled: a wired drop does not share airtime with customer phones, and four short office-to-wall runs are a morning's work for one installer. Test a video download at the farthest screen position before committing to wireless.
What happens to playback when the internet drops?
Prefer players that store their downloaded schedule on the device. Those units are designed to keep playing the last schedule through a connection outage and to collect new content when the link returns, so the screens keep working while the office connection is down. Ask the question before buying, because a player that streams its playlist live goes dark with the connection.
Planning information, not legal or engineering advice. Rules differ by place: check codes and permits with your local authority and your licensed trades.