Sennheiser SI 20 User Manual

Features—Benefits

• Feeds DC power to eight SZI 30-R slave emitters for expanded coverage

• Switchable mono (Channel 1 or channel 2) or stereo operation, 95/250 kHz

• Up to 750 sq. ft. coverage using a single SZI-30R slave emitter

• Compatible with the SET100 personal listening system

• Two BNC connectors allow for expanded coverage using SZI 1029 emitters

• 1-year warranty

• Easy installation—no need to supply local power to each slave

• Flexible operation for compatibility

• Wide coverage means greater efficiency

• Wide installed base of SET 100’s ensure a ready audience

• No need for adapters. Just plug and go

• Internal power supply (SI 20-R)

Technical Data

Carrier frequencies 95/250 kHz switchable

Number of diodes 12

Coverage area (mono/stereo) 750/375 sq. ft.

Input sensitivity 40 mV–20 V w/ Automatic Gain Control

Power requirements 110 V AC

Input connectors 1/4" unbalanced line level, (2) phone jacks

Output connectors 5-pin, lockable, Pre H connectors and (2) BNC

Weight approx. 5.5 lbs.

Dimensions in inches 9 x 1.75 x 8

SI20R/SZI30R

Product Variants

IR package to cover 1500/750 sq. ft.
in single/ two channel mode SI 20-1500

IR package to cover 2250/1125 sq. ft.
in single/ two channel mode SI 20-2250

IR package to cover 3000/1500 sq. ft.
in single/ two channel mode SI 20-3000

SI 20-R/SZI 30R Two Channel IR Modulator & Remote Emitter

The SI 20-R two-channel, 95/250 kHz, wideband infrared modulator is a single rack-space unit
that can drive up to eight SZI-30R emitter panels for up to 6,000 sq. ft. of coverage. This easy-to­use, integrated system offers a cost-effective solution for ADA compliance for the hard of
hearing, simultaneous language interpretation, and other assistive listening applications. Each
SZI30-R slave emitter panel floods an area of up to 750 sq. ft. (in mono mode), and can be
remotely powered by the SI20-R. Several SZI-30R emitters can be clustered together at a single
mounting point and aimed individually, using optional clamping accessories.

Front view of SI 30/SZI 30

Back view of SZI 30

Required Components

Mounting clamp
(one required for each SI30 and SZI30) IZK20

Coax cable with twisted pair (Belden 8734)
to connect SI20-R to SZI30-R, 6” ICC 20-R

Supplied Accessories

1 power cord for 110V AC outlet

1 SZI 30 RA remote adapter and (2) pre H connectors for SZI 30

SI20R/SZI30R

Sennheiser Electronic Corporation, 1 Enterprise Drive, Old Lyme, CT 06371

Telephone: [phone] • Fax: [phone] • Web: http://www.sennheiserusa.com

Sennheiser Mexico:

Av. Xola 613, PH6, Col. Del Valle 03100, Mexico, DF. Telephone: [phone]. Fax: [phone]
Sennheiser Canada: 221 Labrosse Ave, Pte-Claire, PQ H9R 1A3. Telephone: [phone]. Fax: [phone]
Manufacturing Plant: Am Labor 1, 30900 Wedemark, Germany

Coverage area of the SI 20-R / SZI 20

Polar pattern of the SI 20-R/SZI 20

Four SZI 20, mounted at an angle of 60° to one
another. For comparison purposes, the coverage
of a single SZI 30 is shown at 30°.

Architect’s Specifications

The unit shall be a 2-Channel IR modulator & remote filter with 12 diodes. The carrier
frequencies shall be 95 and 250 kHz. The frequencies must be switchable. The coverage area
shall be 750 sq. ft. in mono mode, and 375 sq. ft. in stereo mode. The input sensitivity shall be
40 mV with automatic gain control. The power requirements shall be 110 V AC. The input
connectors shall be 1/4" unbalanced line level connectors.The output connectors shall be
5-pin and lockable. The dimensions shall be 9 x 1.75 x 8 inches and weigh approx 5.5 lbs. The
unit shall be a Sennheiser SI 20-R/SZI 20R.

Optional Accessories

Mounting hardware for clusters
of 2 to 4 SI30 and SZI30 IZM 20

Wall/ceiling mount, 5/8” thread WM1

Adapter, 5/8” to 3/8”, for mounting
a single SI30 or SZI30 MZA216

Omni-directional ball joint wall mount & flange GZG1029 & GZP10

Floor stand SEMS3000

Compatible Accessories

Single channel stethophone receiver, 95kHz RI100-A/RI100-J

Single channel stethophone receiver, 250kHz HDI91-P2

Two channel stethophone receiver H200

Two channel stethophone receiver with squelch HDI92-P

Charger and power supply for 10 batteries L92-10 and NT92-120

Charger and power supply for 20 batteries L92-20 and NT92-120

Charger and carrying case for 20 batteries HC101

Spare rechargeable batteries BA90 NiMH

Latex replacement ear cushions EP405L

Foam replacement ear cushions EP405F

SZI 30 RA