Extron SPK18P/1000 (part number 22-153-03) — the plenum-rated 18 AWG cable in Extron's SPK speaker range, on a 1,000 foot spool.

Distributed ceiling audio generates a great deal of cable, and much of it runs through the return-air plenum. That is exactly the job this part number is stocked for. The conductor set matches the standard SPK 18: one pair, bare copper, 18 AWG apiece, with Extron's higher-than-usual strand count so a light gauge does not become a stiff one. What changes is the jacket, which carries the plenum rating. Extron advises that its plenum bulk cable holds North American approvals and is not certified in most European countries.

Key Capabilities

• Plenum-rated SuperFlex jacket, numbered sequentially along its length
• Two 18 AWG bare copper conductors, one pair
• Lightest SPK gauge, so it adds least bulk when a ceiling carries dozens of drops
• 1,000 ft (305 m) spool, self-dispensing box
• Raised strand count for flexibility above the ceiling grid
• Non-plenum equivalent: Extron SPK18/1000, part number 22-150-03

Where It Is Used

Ceiling loudspeaker networks in corporate offices, schools and universities, healthcare paging and masking systems, hospitality and retail background music, and transport terminals — anywhere the run crosses an air-handling space and local code calls for plenum-rated cable.

Specifications at a Glance

• Conductor gauge: 18 AWG
• Conductors: two, bare copper, one pair
• Jacket: SuperFlex, plenum rated, sequentially numbered
• Spool: 1,000 ft (305 m), self-dispensing box
• Extron part number: 22-153-03

Also referenced as Extron SPK18P/1000, SPK18P-1000, SPK18P1000, SPK 18 Plenum, part number 2215303. Extron's plenum bulk cable is rated for North America and is not certified for use in most European countries.