SR IEM G4
RF CHARACTERISTICS
Modulation: Wideband FM stereo (MPX pilot tone)
Frequency ranges: 
A1: 470-516 MHz
A: 516-558 MHz
AS: 520-558 MHz
G: 566-608 MHz
GB: 606-648 MHz
B: 626-668 MHz
C: 734-776 MHz
D: 780-822 MHz
E: 823-865 MHz
Receiving frequencies: 
Max. 1680 frequencies, adjustable in 25 kHz steps
20 frequency banks, each with up to 16 factory-preset channels, no intermodulation
6 frequency banks with up to 16 programmable channels
Switching bandwidth: up to 42 MHz
Nominal/peak deviation: ±24 kHz / ±48 kHz
MPX pilot tone (frequency/deviation): 19 kHz/±5 kHz
Frequency stability: ±10 ppm
Antenna output: BNC socket, 50 Ω
RF output power at 50 Ω: 
switchable: 
Low: typ. 10 mW
Standard: typ. 30 mW
High: typ. 50 mW
AF CHARACTERISTICS
Compander system: Sennheiser HDX
AF frequency response: 25 Hz to 15 kHz
AF input BAL AF IN L (I) + MONO/BAL AF IN R (II): 2x XLR3-1/4" (6.3 mm) jack combo socket, electronically balanced
Max. input level: +22 dBu
Total harmonic distortion (THD): <0.9 %
Signal-to-noise ratio (at nominal load and peak deviation): >90 dB
AF output LOOP OUT BAL L (I)/LOOP OUT BAL R (II): 1/4" (6.3 mm) stereo jack socket, balanced
OVERALL DEVICE
Temperature range: -10 °C to +55 °C
Power supply: 12 V DC
Current consumption: max. 350 mA
Dimensions: Approx. 202 x 212 x 43 mm
Weight: Approx. 980 g
EK IEM G4
RF CHARACTERISTICS
Modulation: Wideband FM
Frequency ranges: 
A1: 470-516 MHz
A: 516-558 MHz
AS: 520-558 MHz
G: 566-608 MHz
GB: 606-648 MHz
B: 626-668 MHz
C: 734-776 MHz
D: 780-822 MHz
E: 823-865 MHz
Receiving frequencies: 
Max. 1680 frequencies, adjustable in 25 kHz steps
20 frequency banks, each with up to 16 factory-preset channels, no intermodulation
6 frequency banks with up to 16 programmable channels
Switching bandwidth: up to 42 MHz
Nominal/peak deviation: ±24 kHz / ±48 kHz
Receiver principle: Adaptive diversity
Sensitivity (with HDX, peak deviation): < 4 muV, typ. 1.6 muV for 52 dBA rms S/N
Adjacent channel selection: Typically >= 65 dB
Intermodulation attenuation: Typically >= 70 dB
Blocking: >= 80 dB
Squelch: 5 to 25 dBµV, adjustable in steps of 2 dB
Pilot tone squelch: Can be switched off
AF CHARACTERISTICS
Compander system: Sennheiser HDX
Signal-to-noise ratio (1 mV, peak deviation): approx. 90 dBA
Total harmonic distortion (THD): <= 0.9 %
Output power at 2.4 V, 5 % THD, nominal deviation: 2 x 100 mW at 32 Ω
High Boost: +8 dB at 80 kHz
Limiter: -18 dB to -6 dB, adjustable in steps of 6 dB, can be switched off
OVERALL DEVICE
Temperature range: -10 °C to +55 °C
Power supply: 2 AA batteries, 1.5 V or BA 2015 accupack
Nominal voltage: 3 V battery / 2.4 V rechargeable battery
Current consumption at nominal voltage: approx. 140 mA with transmitter switched off: <= 25 µA
Operating time: approx. 4 to 6 hours (depending on volume level)
Dimensions: Approx. 82 x 64 x 24 mm
Weight (incl. batteries): approx. 125 g