Sennheiser AB 9000 A1-A8 Antenna booster, +17 dB, N connection, 470-638 MHz - 504708

Product Overview

The Sennheiser AB 9000 A1-A8 is an in-line active antenna booster designed for use with Sennheiser Digital 9000 wireless systems. Operating across the 470–638 MHz UHF range, it delivers +17 dB of linear RF amplification to compensate for signal losses that accumulate over long coaxial cable runs in large venue installations. Eight highly selective bandpass filters — each covering a 24 MHz window — block out-of-band interference before it reaches the first active stage, protecting system integrity in dense RF environments. The unit is remotely controlled from the EM 9046 receiver, with automatic gain adjustment based on measured cable loss.

Product Description

Long antenna cable runs are a practical necessity in large-scale installations: arena stages, convention centers, broadcast facilities, and touring rigs routinely require antenna cable lengths that introduce significant coaxial loss. The AB 9000 A1-A8 addresses this directly by placing an active +17 dB gain stage in-line with the antenna feed, restoring signal levels that would otherwise degrade receiver sensitivity. The booster and receiver work together to measure actual cable loss on the RF coax and automatically set gain accordingly, eliminating the need for manual level-matching at installation time. Eight remotely selectable bandpass filters — each passing a 24 MHz window within the A1–A8 tuning range — provide front-end selectivity that suppresses intermodulation products and adjacent-band interference before they reach the amplifier. This makes the AB 9000 particularly well-suited to environments where multiple wireless systems operate simultaneously and RF spectrum is congested. The filter selection is controlled remotely from the EM 9046 Digital 9000 receiver, or can be set manually when the receiver is not present. N-type connectors are used at both the input and output, consistent with the Digital 9000 system's infrastructure-grade connectivity standard. Power is supplied to the booster through the antenna cable itself, requiring no separate power feed at the remote antenna location. The unit covers the full A1-A8 frequency range of 470–638 MHz, providing coverage across all eight sub-bands of the Digital 9000 spectrum plan.

Key Features

• +17 dB Linear RF Amplification — Compensates for coaxial cable losses in long antenna runs without introducing distortion.
• Eight Highly Selective Bandpass Filters — Each filter passes a 24 MHz window, blocking out-of-band signals before the amplifier stage.
• Automatic Gain Control — Receiver and booster jointly measure cable loss and set gain automatically at installation.
• Remote Filter Selection — Filter bank is controlled remotely from the EM 9046 receiver; manual selection available without the receiver.
• N-Type Connectors — Industry-standard N-type RF connectors at input and output for robust, low-loss connections.
• Phantom Power via Antenna Cable — Powered through the coaxial antenna cable; no separate power supply required at the antenna location.
• 470–638 MHz Coverage — Covers all eight A1–A8 sub-bands of the Sennheiser Digital 9000 UHF frequency plan.
• High Intermodulation Resistance — Highly linear amplifier design minimizes intermodulation products in multi-system deployments.
• Digital 9000 Native Integration — Designed specifically for the Sennheiser Digital 9000 ecosystem; fully compatible with EM 9046 receivers.

Typical Applications

• Large arena and stadium wireless microphone deployments requiring extended antenna cable runs
• Broadcast studios and mobile production trucks with remote antenna placements
• Houses of worship with distributed antenna infrastructure across large sanctuaries
• Convention centers and conference facilities with centralized receiver racks and remote antennas
• Touring and theatrical productions using Digital 9000 wireless systems with front-of-house antenna positions
• Theme park and attraction installations with long coaxial feeder runs

Technical Specifications

Frequently Asked Questions

Q: What is the AB 9000 A1-A8 used for?

It is an active in-line antenna booster that compensates for coaxial cable signal loss in long antenna runs used with Sennheiser Digital 9000 wireless systems. It amplifies the RF signal by +17 dB to restore receiver sensitivity over extended cable distances.

Q: Which Sennheiser systems is the AB 9000 compatible with?

The AB 9000 A1-A8 is designed for the Sennheiser Digital 9000 wireless system and is controlled remotely via the EM 9046 receiver. It is not intended for use with EW, EW-D, EW-DX, or other non-Digital 9000 product families.

Q: How does the automatic gain control work?

The EM 9046 receiver and the AB 9000 jointly measure the actual insertion loss of the connecting coaxial cable and automatically adjust the booster's gain to the appropriate level. This eliminates manual calibration during installation.

Q: Does the AB 9000 require a separate power supply?

No. The unit is powered through the antenna cable itself using phantom powering over the coax, so no separate power connection is needed at the remote antenna location.

Q: What do the eight bandpass filters do?

Each of the eight filters passes a 24 MHz frequency window corresponding to one of the A1–A8 sub-bands. The active filter can be selected remotely from the receiver, ensuring that only the relevant portion of the spectrum is amplified and that out-of-band signals are rejected before reaching the amplifier.

Q: What type of connectors does the AB 9000 use?

The AB 9000 uses N-type RF connectors at both the input and output, consistent with the connector standard used across the Digital 9000 system infrastructure.

Q: Can the filter be selected manually without the EM 9046 receiver?

Yes. Filter selection can be performed manually on the unit when the EM 9046 receiver is not connected, allowing for standalone configuration during installation or testing.

Q: What is the maximum cable loss the AB 9000 can compensate for?

The linear RF amplifier is designed to compensate for cable losses of up to 14 dB, making it suitable for the antenna cable run lengths typically encountered in large venue and touring installations.