Sennheiser SI 1015-12500 Single System Package, 12,000 sq ft coverage

Product Overview

The Sennheiser SI 1015-12500 Single System Package is a complete infrared assistive listening system for large venues requiring ADA-compliant hearing assistance coverage up to 12,000 square feet from a single-radiator installation. Built around the SI 1015 wideband modulator and one SZI 1029 infrared emitter, this package is designed for open-plan spaces with clear line-of-sight across the coverage area, such as large sanctuaries, auditoriums, and government assembly rooms. The package ships with all modulator hardware, 15 RI 250 IR stethophone receivers, charging units, and mounting accessories for a complete, single-vendor installation.

Product Description

The SI 1015-12500 Single System Package delivers up to 12,000 square feet of infrared audio coverage using one high-output SZI 1029 infrared radiator driven by the SI 1015 wideband modulator. This configuration is best suited for venues with open, unobstructed floor plans where a single, well-positioned radiator can achieve adequate IR field strength throughout the entire seating area without requiring a second emitter.

The SI 1015 modulator operates on carrier frequencies of 2.3 and 2.8 MHz, supporting single-channel, two-channel, and stereo transmission. Two balanced XLR-3 inputs allow direct connection from AV mixing consoles, DSP output zones, or hearing loop amplifier line outputs with no additional interface hardware required. The modulator's dual BNC RF outputs provide flexibility for future system expansion: a second radiator can be added later by connecting to the second BNC output or daisy-chaining from the first, allowing venues to upgrade from single to dual radiator coverage without replacing any core equipment.

The modulator mounts in a standard 1U, half-rack (1/2 19-inch) enclosure and includes rack-mount ears and a GA1031-CC rack adapter for integration into existing AV equipment racks. Alternatively, the included WM1 wall mount allows the modulator to be installed without a rack in smaller equipment rooms or AV closets.

Fifteen RI 250 IR stethophone receivers are included for distribution to audience members. Two L151-120 charging units and an NT2013-120 power supply manage overnight receiver charging between services or events. This package represents a practical entry point for large-venue infrared assistive listening at a lower cost than the dual-radiator configuration, while retaining full upgrade capability within the SI 1015 system ecosystem.

Key Features

• Single SZI 1029 Radiator for Open-Plan Spaces — One high-output 2-watt infrared emitter covers up to 12,000 square feet in rooms with clear sightlines and minimal obstructions.
• Upgradeable to Dual-Radiator Configuration — The SI 1015 modulator's second BNC RF output allows a second radiator to be added at any time without replacing the modulator or rewiring the audio feed.
• 2.3 and 2.8 MHz Carrier Frequencies — Dual IEC 61603-standard carrier frequencies enable simultaneous two-channel or stereo transmission from a single modulator unit.
• Single, Two-Channel, and Stereo Transmission Modes — Switchable modes allow the system to serve standard assistive listening, bilingual interpretation, or stereo audio distribution from one device.
• Two Balanced XLR-3 Audio Inputs — 600Ω impedance balanced inputs accept line-level audio from professional mixing consoles, DSPs, and hearing loop amplifier outputs across a 10mV–5V range.
• 1/2 19-Inch, 1U Rack-Mount Housing — Compact half-rack modulator with included rack ears fits into standard AV racks without occupying a full rack unit.
• 15 x RI 250 IR Stethophone Receivers Included — Lightweight, over-ear IR receivers compatible with the SI 1015 system ship in the box, reducing the need for separate receiver procurement.
• Integrated Charging Infrastructure — Two L151-120 charging units and an NT2013-120 power supply provide a complete receiver charging workflow between uses.
• WM1 Wall Mount and GA1031-CC Rack Adapter Included — Both rack and wall mounting options are included, giving installers flexibility for equipment placement without additional hardware purchases.
• IR Monitoring Diodes on Modulator — Built-in monitoring diodes on the SI 1015 provide a quick visual check of IR output status during installation and routine operation.

Typical Applications

• House of Worship — Large open-plan sanctuaries with unobstructed sightlines where a single, ceiling- or wall-mounted radiator can serve the full seating area.
• Auditorium — Fixed-seat performing arts venues, civic auditoriums, and school auditoriums requiring ADA-compliant IR assistive listening.
• Government Space / Courtroom — Legislative chambers, courtrooms, and public hearing rooms with clear lines of sight from a single elevated radiator position.
• Conference Center — Large ballrooms and plenary halls where seating density and room geometry are compatible with single-point IR distribution.
• University Lecture Hall — Tiered or flat-floor lecture environments with unobstructed IR sightlines from a front or ceiling-mounted radiator position.

Technical Specifications

Frequently Asked Questions

Q: Is a single radiator sufficient for 12,000 square feet?

A single SZI 1029 radiator can cover up to 12,000 sq ft in rooms with clear, unobstructed sightlines from the radiator mounting position to all seating areas. Rooms with columns, balconies, structural obstructions, or irregular geometry may benefit from a dual-radiator configuration. Contact Creation Networks at creationnetworks.net for a coverage assessment.

Q: Can this system be upgraded to dual-radiator coverage later?

Yes. The SI 1015 modulator includes two BNC RF outputs. A second radiator can be connected to the unused output at any time, converting this system to the dual-radiator configuration without replacing the modulator or rewiring the audio inputs.

Q: Is this system ADA-compliant for assistive listening?

Infrared systems using IEC 61603-standard carrier frequencies (2.3 and 2.8 MHz) are an accepted assistive listening technology under ADA Standards Section 219. Venues should verify required receiver counts with an accessibility consultant based on their fixed seating capacity.

Q: What is the difference between this package and the SI 1015-12500 Dual System Package?

Both packages use the same SI 1015 modulator and cover up to 12,000 sq ft, but this single package includes one SZI 1029 radiator while the dual package includes two. The dual configuration is recommended for rooms where a single radiator cannot achieve unobstructed IR sightlines to all seating positions. The dual package also includes HDI 302 stereo stethophone receivers, while this package includes RI 250 IR stethophone receivers.

Q: Can the SI 1015 modulator accept audio from a mixing console or DSP?

Yes. The two balanced XLR-3 inputs with 600Ω impedance accept line-level signals from 10mV to 5V, covering standard AV console, DSP zone output, and hearing loop amplifier line levels without additional interfacing.

Q: Does the system support two-channel or interpretation use?

Yes. The SI 1015 modulator supports two-channel operation on 2.3 and 2.8 MHz simultaneously, allowing one audio feed for assistive listening and a second for language interpretation or alternate audio content.

Q: What warranty covers this system?

All components carry Sennheiser's standard manufacturer warranty. Contact Creation Networks at creationnetworks.net for current warranty terms and to register your system after installation.

Q: Is professional installation required?

Proper radiator placement and aiming is critical in large rooms to achieve uniform IR field coverage. Creation Networks recommends working with a certified AV integrator for rooms in this size range. Visit creationnetworks.net to request an integration referral or consultation.