Bosch EVID-C4.2LP-G2 Two-Way 4" Low-Profile Ceiling Speaker

Overview

The EVID-C4.2LP-G2 is a two-way 4" coaxial ceiling speaker engineered for commercial paging, background music, and voice-evacuation-adjacent distributed audio installations where a clean aesthetic matters and reliable certification paperwork is non-negotiable. Part of the Bosch Communications speaker portfolio, it ships as a complete assembly — back can enclosure, tile rails, and mounting ring included — so your installers aren't sourcing secondary hardware on the job site.

The bezel-less magnetic grille sits flush with the ceiling plane, which matters in hospitality lobbies, healthcare waiting rooms, and corporate open-plan spaces where a visible speaker ring breaks the finish. The low-profile form factor also shortens the plenum depth required, a practical benefit when you're working with shallow grid ceilings common in tenant improvement projects.

Key Features

• SwiftLock Installation System: The proprietary SwiftLock mechanism and included tile rails allow a single technician to secure the speaker in a standard drop-ceiling grid without fumbling for additional clips or a second pair of hands — meaningful when you're commissioning dozens of zones across a large floor plate. Tile rails ship in the box, so you're not waiting on a separate accessory order to go live.
• 30W Distributed Audio Transformer (70V / 100V): The built-in 30W transformer supports both 70V and 100V constant-voltage systems — the industry standard for commercial distributed audio where you're running many speakers off a single amplifier channel. This dual-voltage support means the same speaker model works in North American 70V installations and international 100V systems, simplifying your parts inventory if you operate across regions. Tap settings let you reduce power per speaker to balance zone levels without adding external attenuators.
• 8-Ohm Bypass: When you need direct low-impedance drive — small rooms, local amplifier zones, or point-to-point testing — the 8-ohm bypass skips the transformer entirely. This gives integrators flexibility to run the speaker in either distributed or low-impedance mode from a single SKU rather than stocking two separate models.
• Two-Way Coaxial Driver Configuration: A coaxial two-way design places the tweeter at the acoustic center of the woofer, producing more consistent horizontal dispersion and better imaging across the coverage area compared to a simple full-range single-driver cone. For speech intelligibility in paging applications, the result is reduced harshness in the upper-mid frequencies that full-range drivers often exhibit at higher output levels.
• UL1480A, UL2043, and CSA 22.2 205 Listings: UL1480A covers fire protective signaling use — relevant in buildings where your AHJ requires listed speakers in the notification pathway. UL2043 is the plenum rating, confirming the back can and materials are tested for installation in air-handling plenum spaces, which eliminates the conduit-and-firestop workarounds that unlisted speakers require. CSA 22.2 205 extends that certification to Canadian installations. If your project specs call for any of these listings, the EVID-C4.2LP-G2 (often searched as EVID C4.2LP G2) has all three — you won't need to substitute to a different model to satisfy the inspection sheet.
• Complete Assembly — Back Can Enclosure Included: An open-air ceiling speaker without a back can loses low-frequency output and risks coupling with plenum HVAC noise. The included back can enclosure isolates the driver acoustically, maintains consistent bass response, and satisfies the mechanical requirements of the UL plenum listing. Skipping a back can purchase also means one fewer line item on the BOM and one fewer delivery to coordinate.
• Magnetic Grille Removal: Maintenance access — driver inspection, wire checks, tap adjustments — doesn't require tools. The magnetic grille pulls free without clips or screwdrivers, reducing service time per speaker in large installations.
• Priced Individually, Packaged in Pairs: The EVID-C4.2LP-G2 ships in pairs but is priced per unit. Confirm your order quantities match actual zone counts before submitting — buying in the pair-pack format means you won't end up a single speaker short on an odd-count zone layout.

Integration & Compatibility

The 70V/100V transformer taps integrate directly with commercial distributed-audio amplifiers from any major manufacturer — Crown, QSC, Bosch, TOA, Bogen, and others. The 8-ohm bypass works with any standard low-impedance amplifier or zone controller. Because this is a passive speaker with no DSP or network components, compatibility is purely an impedance and power-matching exercise: confirm your amplifier's per-channel wattage covers the total wattage of all speakers on the zone at the selected tap, with at least 20% headroom. No firmware, no drivers, no network configuration required.

For voice evacuation or fire alarm notification, confirm with the authority having jurisdiction whether UL1480A listing alone satisfies the project spec or whether a listed amplifier and full system listing are also required. The speaker's certification covers its own component — system-level listing is a separate determination.

Browse the full range of commercial ceiling speakers if you need additional form factors or wattage options for multi-zone projects. If you're planning a distributed audio layout, pairing this speaker with a matched commercial amplifier from your system design is the standard approach for zone balancing. For structured wiring and in-ceiling cable routing, see structured cabling to source plenum-rated speaker cable in the same procurement cycle.

What's in the Box

• 1x EVID-C4.2LP-G2 4" two-way coaxial ceiling speaker with white bezel-less magnetic grille
• 1x Back can enclosure
• 1x SwiftLock mounting ring
• Tile rails (for drop-ceiling grid installation)

Note: Packaged in pairs; pricing is per unit. Verify zone counts before ordering.

Frequently Asked Questions

Q: Does the EVID-C4.2LP-G2 support both 70V and 100V systems?

A: Yes. The built-in 30W transformer supports both 70V and 100V constant-voltage distributed audio systems, making the same speaker usable in North American and international installations without swapping models.

Q: Is the EVID-C4.2LP-G2 UL listed for plenum installation?

A: Yes. The EVID-C4.2LP-G2 carries UL2043 listing, which covers installation in air-handling plenum spaces. It also holds UL1480A (fire protective signaling) and CSA 22.2 205 (Canadian certification). Confirm with your AHJ whether the project requires additional system-level listings beyond the speaker itself.

Q: Can the EVID-C4.2LP-G2 be used in low-impedance (8-ohm) mode?

A: Yes. The speaker includes an 8-ohm bypass that routes around the transformer for direct low-impedance drive. This is useful for small local zones, point-to-point testing, or installations driven by a low-impedance amplifier rather than a 70V/100V system.

Q: Does the back can enclosure ship with the speaker or need to be purchased separately?

A: The back can enclosure is included in the box along with the SwiftLock mounting ring and tile rails. No separate back can purchase is required.

Q: How is the EVID-C4.2LP-G2 packaged — individually or in pairs?

A: It ships packaged in pairs but is priced individually (per unit). Plan your order quantities carefully to avoid a single-speaker shortfall on odd-count zones.

Q: Does the EVID-C4.2LP-G2 require a specific Bosch amplifier?

A: No. As a passive speaker, it works with any commercial distributed-audio amplifier — Bosch, Crown, QSC, Bogen, TOA, or others — as long as the amplifier's output matches the 70V or 100V system voltage and the per-channel wattage covers the total tap load with appropriate headroom. No proprietary protocols or drivers are involved.

Eden Phillips

The detail I always flag when specifying the EVID-C4.2LP-G2 is the triple certification stack — UL1480A, UL2043, and CSA 22.2 205 — all on a single 4" low-profile model. On projects where the spec sheet calls for plenum-rated fire-signaling speakers with Canadian approval, you'd normally be hunting across multiple product lines. This one covers it without substitution.

Technical Highlights:

• 30W 70V/100V Dual-Voltage Transformer: Single transformer handles both North American 70V and international 100V systems — particularly useful for multi-site deployments that span both regions, or for firms that want a single approved speaker SKU across their entire install base.
• UL2043 Plenum Listing: The included back can enclosure is part of the listed assembly, not an afterthought. This matters because unlisted aftermarket cans can void the plenum rating — here, the can ships with the speaker and the listing covers the complete assembly as it arrives.
• 8-Ohm Bypass: Useful at commissioning time when you want to bench-test or pre-amp a zone before the distributed system is fully wired. Eliminates the need to keep a separate 8-ohm test speaker on the truck.

Deployment Considerations:

• SwiftLock with tile rails means single-tech installation in grid ceilings — but verify your ceiling grid depth accommodates the back can before quoting. Shallow plenum above a drop ceiling can be the constraint that changes the product selection.
• Packaged in pairs, priced per unit: on a 27-speaker zone layout, you'll receive 14 pairs (28 units) and have one spare. Budget that into material counts on tight projects so you're not reconciling a perceived overship.

The EVID-C4.2LP-G2 is the right specification call for commercial tenant improvement projects — particularly healthcare, hospitality, and corporate interiors — where the AHJ is going to check UL1480A and UL2043 on the inspection sheet, the architect wants a flush bezel-less grille, and the installers need to move quickly through a large number of drops without secondary hardware runs.