Sennheiser SZI 1029 dimensions Daisy-chainingthe SZI

SZI 1029

IR Audio Transmission Technology Modulators/Radiators

	When planning and installing an IR system you have to pay attention to use the cor-
	rect terminating impedance for the radiator chains. Sennheiser IR modulators have
	an output impedance of approx. 50 Ω, whereas the radiators have a much higher
	input impedance of > 5 kΩ. This “headroom” allows you to connect many radiators
	without any problems. In RF transmission, the output impedance has to be termi-
	nated with approximately the same input impedance. If this is not done, reflections
Daisy-chaining the SZI 1029	may occur at the end of the RF chain and disturb the transmission. So, for reasons
	of reliability, the end of an RF chain should always be provided with a 50-Ω termi-
	nating impedance. Please note that you should not use “T” adaptors in your RF
	chain as this would halve the terminating impedance.
	50 Ω
	For large installations you should use both RF outputs of the modulator and create
	two RF chains. This not only increases reliability but also avoids cancelling out
	between radiators due to time delay. Please refer to the chapter “Planning Theory”
	for more information on time delay and cancellations.
	50 Ω
	SZI 1029-10
	The SZI 1029-10 is Sennheiser’s most powerful radiator. 264 diodes in 24 inde-
	pendent groups provide an average radiating power of 10 W. The SZI 1029-10 is
Risk of cancelling out!	connected and operated like the smaller SZI 1029. The radiator’s higher power is a
	special asset when it comes to covering large halls or auditoria with high ceilings,
50 Ω	especially when a large number of channels are used.
	The SZI 1029-10 is also interesting for rental companies: due to the higher radiating
	power less radiators are required and IR systems can be set up and taken down
	again more quickly. Sennheiser high-power radiators are convection cooled so no
	cooling fans are used which could cause disturbing noises.

SZI 1029-10 radiator