Extron NF 4C S LP (part number 70-1360-23) — a pair of passive 4 in ceiling speakers used to extend a system built on the powered NF 4C P LP.

These units contain no amplifier, no network interface and no DSP. Each has a single 5 mm two-pole captive screw input and is cabled back to one of the powered speaker's 8 ohm outputs, which means a passive position needs neither a switch port nor its own power. A single NF 4C P LP supports up to three of them, so this pair takes a system from one speaker to three, or completes a four-speaker zone alongside another passive unit. Acoustically they match the powered model: same 4 in paper-cone driver, same 135° conical pattern, same plenum-rated back can.

Key Capabilities

• Passive expansion for an NF 4C P LP zone, with no additional network drops.
• One 5 mm 2-pole captive screw input per speaker, wired to the powered unit's outputs.
• Identical 4 in (101.6 mm) paper-cone driver and 135° conical coverage.
• Plenum-rated, fire-resistant UL94V-0 composite back can and baffle.
• Magnetically attached powder-coated steel grille that can be painted to suit the ceiling.
• Supplied as two speakers, 4.7 lbs (2.1 kg) each, with V-rails and foldable C-rings.

Where It Is Used

Anywhere an existing PoE speaker zone needs more coverage: classrooms that gained seating, meeting rooms extended into adjoining space, lobbies and corridors adjacent to a powered position. Because the passive units are cabled locally, expansion does not consume further switch ports.

Specifications at a Glance

• Package: two NF 4C S LP passive speakers (one pair)
• Input connector: one 5 mm captive screw connector, 2 pole, per speaker
• Enclosure: 4.72 in H x 10.64 in diameter; 9.3 in ceiling cutout
• Weight: 4.7 lbs (2.1 kg) per speaker
• Warranty: 5 years parts and labor

Also referenced as Extron NF4CSLP, NF-4C-S-LP, part number 70136023.