Alpha SK004 3.5" Square Intercom Speaker, 45 Ohm, Mylar

Designed for dependable voice transmission in entry, security and monitoring systems, the Alpha Communications SK004 3.5" Square Intercom Speaker delivers clear, consistent audio where communication matters most. This intercom speaker features a resilient mylar cone that resists environmental wear and keeps spoken messages intelligible across corridors, lobbies and nurse-call stations. With a compact 3.5" square footprint and a low 0.5" depth, it fits standard panel and door cutouts for fast retrofits and new installations.

Engineered for performance, the SK004 uses a 45 ohm impedance and supports up to 1W RMS output, extracting reliable sound from both legacy intercom systems and modern access-control amplifiers. Installers appreciate the flexible wiring options—pigtail primary connections plus screw terminals—so deployment and servicing are fast and cost-effective. Ideal for building entry points, surveillance monitoring points, and healthcare communication panels, this Alpha Communications intercom speaker helps ensure messages are heard clearly when they count. Order the SK004 to upgrade or replace speakers in your security, intercom, or nurse-call systems and improve on-site communication today.

• Improves voice intelligibility for entry and security systems, delivering clear two-way communication for intercom, surveillance and nurse-call applications
• Durable mylar cone and compact 3.5" square design for reliable performance in tight panel or door-mount installations
• 45 ohm impedance and 1W RMS handling optimized to extract maximum audio output from legacy and modern intercom amplifiers
• Simple wiring with pigtail and screw-terminal options reduces installation time and maintenance costs for installers and integrators
• Backed by Alpha Communications quality and a 1-year limited warranty for dependable operation in commercial environments