Sennheiser - EW100 Microphone - Multiple models

Original professional Sennheiser wireless microphone, model ew100, in excellent physical condition and tested and working. The product shows some light signs of wear due to age. Year of construction: 2000. Serial number.
Tx 355841 Rx 432969. Total weight approx. 1.7 kg.
The product shipment will be included in the transport case with foam 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 an additional description of the product’s condition. It is advisable to inspect them carefully before purchasing.

EM100 System
AF Features
Wideband FM modulation
Frequency bands 790 – 822 MHz
Receive/transmit frequencies: 1280 (4 channels), tunable in 25 kHz steps
Bandwidth 32 MHz
Nominal/peak deviation: ±24 kHz / ±48 kHz
Frequency stability ≤ ± 15 ppm
BF Features
Sennheiser HDX compander system
Frequency response 60–18,000 Hz
Signal-to-noise ratio with 1 mV ≥ 110 dB(A)
Distortion (THD)
(nominal deviation and 1 kHz) ≤ 0.9%
Temperature range -10°C to +55°C
In accordance with the standards ETS 300 422, ETS 300 445 (CE), FCC

SKM100 transmitter
Microphone Capsule Data
Dynamic transducer
Sensitivity 1.5 mV/Pa
Max. sound pressure 150 dB SPL
Directivity cardioid

General Data
RF output power into 50 Ω — typ. 30 mW
Frequency Range 790 – 822 MHz
Power supply: 9 V alkaline manganese battery
Current consumption ≤ 60 mA
Autonomy > 8 h
Dimensions (mm) Ø 50 x 225
Weight ca. 420 g

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





These devices are equipped with Sennheiser's new HDX noise suppression system. HDX reduces interference caused by transmission. It increases the signal-to-noise ratio for wireless transmission up to 110 dB.
HDX is a broadband compander system that compresses the BF level of the transmitter with a 2:1 (in dB) ratio and expands it again in a mirror-like fashion in the receiver. This system significantly reduces transmission problems.
HDX was developed for use in wireless transmission technology, for studio and stage applications, and has been patented by Sennheiser.
The "True Diversity" method instead provides for the use of two antennas and therefore two independent receiving circuits. The antennas are positioned in different locations. Thanks to an electronic comparison inside the receiver, the reception channel is always switched to the baseband channel for the circuit that has the stronger RF signal. The likelihood that two field-strength nulls occur simultaneously on both antennas is extremely low.