Whirlwind PB24 Passive Press Box - 1 line in, 24 mic outs

The Whirlwind PB24, part of Whirlwind's PB Series of passive press boxes, takes multi-feed press conference and broadcast audio distribution to a new level with its fully passive transformer-isolated architecture, superior interchannel isolation and rugged all-steel construction engineered for the most demanding live production environments. This 1-input, 24-output passive press box is built entirely around Whirlwind's own TRSP-2F transformers — distributing a single line level input to twenty-four independent mic level outputs with exceptional signal integrity, zero coloration and no power requirements of any kind. Each output is individually transformer isolated and ground lifted to actively eliminate hum, buzz and noise problems caused by ground loops in complex multi-recorder press environments, while channel-to-channel isolation of up to 107 dB between non-adjacent output pairs ensures total signal independence between connected broadcast and recording feeds. The PB24's fully passive design makes it the definitive solution for press conferences, political events, major sporting events and any live production where a large number of independent mic level feeds must be distributed cleanly, reliably and without introducing noise or coloration into any broadcast chain.

General Specifications:

• System Type: Passive Press Box, 1 Line Input / 24 Mic Outputs
• Input Impedance: 2kΩ
• Output Impedance: 150Ω
• Operating Level: 0 dB input = -43 dB output
• Channel-to-Channel Isolation: 65 dB between vertically adjacent channel pairs / 107 dB between non-vertically adjacent pairs
• Transformers: Whirlwind TRSP-2F (throughout)
• Input Connector: 1x XLR Female (line level)
• Output Connectors: 24x XLR Male (mic level)
• Power Requirements: None (fully passive)
• Housing: Cold-rolled steel with integrated carrying handle

Dimensions:

• Width: 9.5 in. (241 mm) rack-compatible chassis
• Housing: Rugged cold-rolled steel enclosure

Features:

• Fully passive design requires no power source of any kind — plug-and-play deployment in any press conference, broadcast or live production environment
• Twenty-four independently transformer-isolated mic level outputs deliver clean, reliable signal distribution to recorders, broadcast trucks and mixing consoles simultaneously
• Whirlwind TRSP-2F transformers throughout provide exceptional signal transparency, frequency response linearity and long-term reliability under heavy touring and event use
• Individual ground lift on every output actively eliminates hum and buzz caused by ground loops in complex multi-recorder and multi-broadcaster press environments
• Up to 107 dB of channel-to-channel isolation between non-adjacent output pairs ensures total signal independence between all connected broadcast and recording feeds
• Fully compatible with Whirlwind PRESSPOWER2 and PRESSMITE active press boxes — connect to their line level output to dramatically expand total mic output count on-site
• Compatible with any line level source including mixing consoles, active direct boxes and press box line outputs for maximum deployment flexibility
• Rugged cold-rolled steel housing with integrated carrying handle withstands the demands of frequent transport, setup and teardown at high-profile press events
• Available in PB6, PB12 and PB24 configurations for scalable output count matched to any event size or press credential requirement

Event Starts specializes in premium audio and video production rentals, offering top-of-the-line sound systems and equipment with expert delivery and installation. We serve New York, New Jersey, Connecticut, Pennsylvania, Delaware, Maryland, Massachusetts, Rhode Island, Vermont, New Hampshire, Virginia, and Washington DC, ensuring seamless access to the right equipment for your event. Whether you're organizing a concert, festival, corporate event, or live production, our professional audio systems deliver outstanding performance and reliability, with expert support every step of the way.