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

Product Overview

The Sennheiser SI 1015-12500 Dual System Package is a complete infrared assistive listening system designed for large venues requiring ADA-compliant hearing assistance coverage up to 12,000 square feet. Built around the SI 1015 wideband modulator and a dual-radiator configuration using two SZI 1029 emitters, this package delivers reliable IR audio distribution across houses of worship, auditoriums, courtrooms, and government facilities. As a turn-key Sennheiser infrared hearing loop alternative, it ships with all hardware, receivers, and charging infrastructure needed for immediate deployment.

Product Description

The SI 1015-12500 Dual System Package pairs the SI 1015 wideband modulator with two SZI 1029 infrared radiators to provide consistent, line-of-sight IR audio coverage across rooms up to 12,000 square feet. The SI 1015 modulator operates on carrier frequencies of 2.3 and 2.8 MHz, supporting single-channel, two-channel, and stereo transmission modes — making it suitable for bilingual or dual-language environments as well as standard assistive listening deployments.

The dual-radiator layout is the recommended approach for larger spaces where a single emitter cannot achieve full coverage without shadowing or dead zones. Each SZI 1029 radiator delivers 2 watts of IR output, and the two units can be daisy-chained via BNC connections from the modulator's dual RF outputs, simplifying cabling runs. The modulator mounts in a standard 1U, half-rack enclosure and includes rack ears for integration into an AV equipment rack.

Fifteen HDI 302 stereo IR stethophone receivers are included, suitable for distribution to audience members or congregation. Two L151-120 charging units with an NT2013-120 power supply handle overnight receiver charging. A GA1031-CC rack adapter and WM1 wall mount round out the installation hardware, giving integrators flexible options for both rack-mounted and wall-mounted modulator placement.

This system is well suited to ADA Title III compliance scenarios where a venue must provide assistive listening devices for a defined percentage of seating capacity. At this coverage tier, the SI 1015-12500 Dual Package is a practical choice for mid-to-large auditoriums, large sanctuaries, legislative chambers, and performing arts spaces. All components ship as a matched Sennheiser system, ensuring interoperability and simplified warranty support through a single vendor.

Key Features

• Dual SZI 1029 Radiator Configuration — Two 2-watt infrared emitters provide full, overlap-capable coverage across spaces up to 12,000 square feet, eliminating the dead zones common with single-radiator installations.
• 2.3 and 2.8 MHz Carrier Frequencies — The SI 1015 modulator operates on both standard IEC 61603 IR carrier frequencies, enabling simultaneous dual-channel or stereo audio transmission.
• Single, Two-Channel, and Stereo Modes — Switchable transmission modes allow this system to serve standard assistive listening, bilingual interpretation, and stereo audio distribution from a single modulator.
• Two Balanced XLR-3 Audio Inputs — Professional-grade balanced inputs with 600Ω impedance accept signals from mixers, DSPs, or hearing loop amplifiers across a wide 10mV–5V input range.
• BNC Daisy-Chain RF Outputs — Dual BNC RF outputs on the modulator allow radiators to be chained in series, reducing the need for individual cable runs back to the rack.
• 1/2 19-Inch, 1U Rack-Mount Housing — Compact half-rack form factor with included rack ears fits neatly into standard AV racks alongside DSPs, amplifiers, and audio signal processors.
• 15 x HDI 302 Stereo IR Stethophone Receivers — Lightweight over-ear receivers designed for use with Sennheiser IR systems; compatible with standard 3.5mm hearing aid neck loops.
• Integrated Charging Infrastructure — Two L151-120 charging units and an NT2013-120 power supply are included to maintain receiver battery health between events or services.
• WM1 Wall Mount and GA1031-CC Rack Adapter Included — Installation hardware for both wall-mounted and rack-mounted configurations ships in the box, reducing field procurement.
• IR Monitoring Diodes — Built-in monitoring diodes on the SI 1015 modulator provide a visual indication of IR signal activity without requiring a separate test receiver.

Typical Applications

• House of Worship — Large sanctuaries and multi-purpose worship halls requiring ADA-compliant assistive listening for congregants with hearing loss.
• Auditorium — Fixed-seat performing arts venues, school auditoriums, and civic theaters needing distributed IR receiver systems.
• Government Space / Courtroom — Legislative chambers, courtrooms, and public hearing rooms where assistive listening is mandated under ADA Title II.
• Conference Center — Large meeting halls and ballrooms with variable seating configurations that benefit from infrared's inherent room-containment.
• University Lecture Hall — Fixed-installation lecture environments requiring hearing assistance for students with documented accommodation needs.

Technical Specifications

Frequently Asked Questions

Q: Is this system compliant with ADA assistive listening requirements?

Infrared systems using IEC 61603-compliant carrier frequencies (2.3 and 2.8 MHz) are an accepted technology under ADA Standards for Accessible Design Section 219. Venues should verify the number of required receivers with their accessibility consultant based on seating capacity.

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

Yes. The SI 1015 provides two balanced XLR-3 inputs with 600Ω impedance and accepts line-level signals from 10mV to 5V, making it compatible with standard AV mixing consoles, DSP output zones, and hearing loop amplifier line outputs.

Q: How are the two radiators connected to the modulator?

The SI 1015 modulator provides two BNC RF outputs. Each radiator connects to one output, or the units can be daisy-chained via BNC. Sennheiser GZL 1019-series BNC cables (1m, 5m, and 10m) are sold separately and are the recommended interconnect.

Q: Does the system support dual-language or interpretation applications?

Yes. The SI 1015 modulator supports two-channel operation, with channel 1 on the 2.3 MHz carrier and channel 2 on the 2.8 MHz carrier. This allows simultaneous delivery of two independent audio feeds — for example, original-language and interpreted audio — to receivers tuned to either channel.

Q: What is the warranty on this system?

Sennheiser provides a standard manufacturer's warranty on all SI 1015 series components. Contact Creation Networks at creationnetworks.net for current warranty terms and to register your system.

Q: Are additional receivers available for purchase?

Yes. The HDI 302 stereo IR stethophone is available as a standalone accessory. Creation Networks carries the full range of Sennheiser IR receiver accessories. Visit creationnetworks.net to view compatible receiver options.

Q: Can additional radiators be added to extend coverage?

Yes. The SI 1015 modulator supports additional SZI 1015 or SZI 1029 radiators connected via BNC daisy-chain or through the modulator's barrier strip (compatible with SZI 1015 and SZI 1029-24 only). For coverage requirements beyond this package, contact Creation Networks for a system design consultation.

Q: Is professional installation required?

While the components are designed for straightforward integration, optimal coverage in large rooms benefits from proper radiator placement and aiming. Creation Networks recommends engaging a certified AV integrator for rooms exceeding 5,000 square feet to ensure uniform field strength throughout the coverage area.