Sennheiser manual Technical data, RS 4 system, T 4 transmitter, HDR 4 headphone receiver

Technical data		RS 4 system
Modulation		FM stereo
Range		up to 100 m
Audio frequency response		20 - 19,500 Hz
THD		‹ 1 %
		T 4 transmitter
Power supply		12 V DC via plug-in mains unit NT 92
Power consumption of transmitter		approx. 1 VA
RF output power		typ. 1.2 mW
Signal-to-noise ratio		typ. 70 dB
Frequencies T 4		433.40 MHz, 434.13 MHz, 434.50 MHz (channels switchable)
Frequencies T 4-9		924.80 MHz, 925.80 MHz, 926.50 MHz(channels switchable)
Audio input voltage / Audio connector		10 mV - 3 V / 3.5 mm stereo jack plug + 1/4" (6.3 mm) adaptor
Charging compartments		2, for BA 151
Weight / Dimensions		approx. 90 g (without plug-in mains unit) / 134 x 87 x 33 mm
		HDR 4 headphone receiver
Transducer principle		open
Signal-to-noise ratio		› 65 dB
Max. sound pressure level		103 dB
Tuning range HDR 4		433 - 435 MHz, stepless
Tuning range HDR 4-9		923.1 - 927.0 MHz, stepless
Power supply		via BA 151 rechargeable accuplug, 2.4 V
Current consumption / Operating time		approx. 18 mA / approx. 3.5 hrs per accuplug
Weight / Dimensions		approx. 160 g incl. accuplug / 150 x 80 x 200 mm
Supply schedule	1	T 4 or T 4-9 transmitter
	1 HDR 4 or HDR 4-9 headphone receiver
	1 BA 151 rechargeable accuplug
	1 plug-in mains unit, 12 V DC, for 230, 120 or
		240 V mains voltage
	1 connection cable with 3.5 mm / 6.3 mm (1/4") jack plug adaptor
	1	Plastic tubing
	1 RCA adaptor stereo (US-Version only)
	1	instructions for use

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