The stereo receiver is equipped with 1680 frequencies tunable in 25 MHz steps and has 20 fixed frequency banks with up to 16 compatible frequency presets and another 6 user banks with up to 16 user-programmable frequencies. The receiver's menu-driven backlit display shows current frequency, frequency bank and channel number, metering of RF level, metering of AF level, lock status, and battery status. An auto-lock feature is provided to prevent settings from being accidentally altered.

Furthermore, this receiver includes a switchable high-boost and a multi-level limiter. The limiter is adjustable from -18 dB to -6 dB in 6 dB steps or defeatable (off). Built in a rugged metal housing, it is powered by two 1.5V AA sized batteries or by a Sennheiser BA 2015 rechargeable accupack. The earphone output uses a 3.5mm stereo jack socket.

Robust bodypack receiver delivering clarity along the whole frequency spectrum for daily use on stage. Easy and flexible wireless synchronization between transmitter and receiver via infrared. Compatible with Sennheiser WSM control software for flexible frequency allocation. Up to 16 compatible channels. Up to 42 MHz bandwidth with 1680 selectable frequencies, fully tunable in a stable UHF range. Range: Up to 100 meters / 300'.

Sennheiser EK IEM G4-A1 Specs Receiver Frequency BandA1: 470 to 516 MHzReceiving FrequencyMaximum 1680 receiving frequencies, adjustable in 25 MHz steps
20 frequency banks, each with up to 16 factory-preset channels, no intermodulation
6 frequency banks with up to 16 programmable channelsSwitching BandwidthUp to 42 MHzNominal/Peak Deviation±24 kHz / ±48 kHzReceiver TypeAdaptive diversitySensitivity< 4 μV, typ. 1.6 μV for 52 dBA (with HDX, peak deviation) rms s/nAdjacent Channel SelectivityTypically ≥ 65 dBIntermodulation AttenuationTypically ≥ 70 dBBlocking≥ 80 dBPilot ToneSquelch: Can be switched offSquelch5 to 25 dBµV, adjustable in steps of 2 dBCompanderSennheiser HDXSignal to Noise RatioApproximately 90 dBA (1 mV, peak deviation)Total Harmonic Distortion (THD)≤ 0.9%Audio Output Power2 x 100 mW at 32 Ohms (@ 2.4 V, 5% THD, nominal deviation)Quality Setting Range+8 dB at 80 kHzLimiter-18 dB to -6 dB, adjustable in steps of 6 dB, can be switched offTemperature Range14 to 131°F / -10 to 55°CPower Supply2 x AA batteries, 1.5 V or BA 2015 accupackCurrent ConsumptionAt Nominal Voltage: Approximately 140 mA
With Transmitter Switched Off: ≤ 25 µAOperating TimeApproximately 4 to 6 hours (depending on volume level)Dimensions3.2 x 2.5 x 0.9" / 82 x 64 x 24 mmWeight4.4 oz / 125 g