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IMPORTANT!
P Keep the receiver away from central heating radiators and electric heaters.
Never expose it to direct sunlight.
P Use the receiver in dry rooms only.
TECHNICAL DATA RI 250 (all variants) RI 500 / HDI
302
Modulation FM, mono FM, stereo
Carrier frequencies 2.3 MHz 2.3 MHz / 2.8 MHz
AF frequency response 18-18,000 Hz 18-18,000 Hz
THD < 1 % < 1 %
Signal-to-noise ratio typ. 70 dB typ. 64 dB
Operating time with one accupack approx. 6 h approx. 5 h
Weight with / without accupack 45 g / 35 g 45 g / 35 g
Max. sound pressure level 130 dBA 130 dBA / 126
dBA
SPECIAL TECHNICAL DATA
Audio output on the RI 250-S and
Induction loop output on the RI 250-J 750 mV / 32 Ω
SENNHEISER TECHNOLOGY AND SENNHEISER SERVICE ARE FUTURE-ORIENTED
Even after many years, you will still have unlimited pleasure from your infra-red
sound transmission system. You can buy replacements for wearing parts such
as ear-cushions and accupacks for many years to come. And in the unlikely
event that any repairs should be necessary, Sennheiser service departments
worldwide give moderately priced, fast and competent repairs.
ACCESSORIES
P BA 151 accupack Cat. no. 04146
P Black ear-cushions, firmer version EP1 Cat. no. 04655
P White ear-cushions, softer version EP2 Cat. no. 04656
P L 151 charger for two accupacks Cat. no. 04457
P L 151-10 charging unit for 10 receivers or 10 accupacks Cat. no. 04494