Sennheiser - EW100 Microphone - Multiple models

Original professional Sennheiser wireless microphone system model ew100 in excellent physical condition and tested and working. The product shows some minor signs due to age. Year of manufacture 2000. Serial numbers
Tx 355841 Rx 432969. Total weight approx. 1.7 kg.
Shipping of the product will be included in the transit case with sponge padding (marked Shure, as in the photo) and will be carefully packed in a sturdy box.
The package will be shipped insured.
The photos serve as additional description of the product’s condition. It is advisable to inspect carefully before purchase.

EM100 System
AF Characteristics
Modulation: wideband FM
Frequency range: 790 – 822 MHz
Receiving/transmission frequencies: 1280 (4 channels), tunable in steps of 25 kHz
Bandwidth: 32 MHz
Nominal/peak deviation: ± 24 kHz / ± 48 kHz
Frequency stability: ≤ ± 15 ppm
BF Characteristics
HDX Sennheiser compander system
Frequency response: 60 – 18,000 Hz
Signal-to-noise ratio with 1 mV: ≥ 110 dB(A)
Distortion (THD) (with nominal deviation and 1 kHz): ≤ 0.9%
Operating temperature range: -10°C to +55°C
Complies with: ETS 300 422, ETS 300 445 (CE), FCC

SKM100 Transmitter
Microphone Capsule Data
Transducer: dynamic
Sensitivity: 1.5 mV/Pa
Max. sound pressure level: 150 dB SPL
Polar pattern: cardioid

General data
RF output power into 50 Ω: typically 30 mW
Frequency Range: 790 – 822 MHz
Power supply: 9 V battery, alkaline manganese
Current consumption: ≤ 60 mA
Battery life: > 8 h
Dimensions (mm): Ø 50 x 225
Weight: approx. 420 g

EM100 Receiver
AF Characteristics
Receiver operating principle: True Diversity
Sensitivity (with HDX, peak deviation): < 2.5 µV for 52 dB
Squelch threshold: 0 – 100 V adjustable
Antenna connector: 2 BNC sockets
Frequency Range: 790 – 822 MHz
Antenna input impedance: 50 Ω
AF Output: 6.3 mm jack: balanced +10 dB, unbalanced +4 dB
Attenuation: 0–40 dB
Power supply: 10.5–16 V DC, nominal 12 V DC
Current consumption (operating time): approx. 200 mA
Dimensions (mm): 212 x 145 x 38
Weight: approx. 1100 g


These devices are equipped with Sennheiser HDX noise suppression system. HDX reduces transmission disturbances. It increases the signal-to-noise ratio in wireless transmission up to 110 dB.
HDX is a wideband compander system that compresses the transmitter’s BF level at a 2:1 ratio (in dB) and expands it again in a mirror-like fashion at the receiver. This system substantially reduces transmission issues.
HDX was developed for wireless transmission applications in studios and on stage and has been patented by Sennheiser.
The “True Diversity” method uses two antennas and therefore two independent receiving circuits. The antennas are placed in different locations. Through electronic comparison inside the receiver, the BF channel is always switched to the receiving circuit with the stronger RF signal. The probability that two simultaneous field-strength drops occur on both antennas is extremely low.