Inside the Design
This baseball field sound system is designed for baseball fields, softball fields, Little League facilities, school athletic complexes, and outdoor sports venues requiring clear play-by-play announcements, paging, and high-output music playback. Featuring two Bose Professional ArenaMatch Utility AMU108 8" all-weather loudspeakers, a Rolls RM169 professional 6-channel Bluetooth audio mixer, a Yamaha PX3 stereo power amplifier, two Pure Resonance Audio UC1S handheld microphones, an Xvive U3 digital wireless microphone system, and an AtlasIED DS7E adjustable desktop microphone stand, this outdoor PA system provides flexible sound reinforcement for game announcements, pre-recorded messages, and music during sporting events.
The Bose Professional ArenaMatch Utility AMU108 loudspeakers feature a compact two-way design with an 8" LF8 high-excursion woofer, an EMB2S high-frequency compression driver, and a rotatable 90° x 60° constant-directivity horn for consistent coverage across athletic fields and spectator areas. Each speaker delivers a 90 Hz - 16 kHz frequency response (-3 dB), up to 121 dB calculated peak SPL at 1 meter under AES free-field test conditions, and 200W long-term continuous power handling under the Bose Professional Extended Lifecycle Test. The IP55-rated enclosure includes a three-layer stainless steel grille, water-resistant woofer construction, a protective exterior coating, and an input cover for direct-exposure outdoor installation. Each loudspeaker features an integrated 70V/100V transformer with 8Ω bypass and includes a stainless steel U-bracket for mounting.
The Yamaha PX3 stereo power amplifier provides two independently powered output channels rated at 300W per channel at 8Ω or 500W per channel at 4Ω under Yamaha's specified 1 kHz, 20 ms burst-test conditions. For this system, each Bose AMU108 loudspeaker connects to a separate amplifier channel with its transformer set to 8Ω bypass. This configuration provides independent amplification for both loudspeakers without using their 70V/100V transformer taps. Each AMU108 is rated for 200W long-term continuous power handling under Bose Professional's Extended Lifecycle Test, so the PX3's onboard DSP should be configured with appropriate output limiting and an 80 Hz high-pass filter with a minimum 12 dB/octave slope, as recommended by Bose Professional. The amplifier also features parametric EQ, crossover filters, delay, and speaker protection functions for adjusting performance to the installation.
The Rolls RM169 provides two balanced XLR microphone inputs, four stereo RCA source channels, Bluetooth audio connectivity, and balanced XLR outputs for connection to the Yamaha PX3 amplifier. Two Pure Resonance Audio UC1S dynamic cardioid microphones allow one announcer to operate with a wired connection while another uses the included Xvive U3 wireless microphone system. The Xvive U3 includes one U3T plug-on transmitter and one U3R receiver, supporting one wireless microphone connection at a time. It operates in the 2.4 GHz band with 24-bit/48 kHz digital audio, up to 90 ft line-of-sight range, and up to 5 hours of rechargeable battery operation. The AtlasIED DS7E desktop microphone stand provides adjustable microphone positioning from 8" to 13" for use at a press box or announcer's station.
The wired UC1S microphone connects to the Rolls RM169 using the included Pure Resonance Audio XLR-25 25ft male-to-female microphone cable. The second UC1S microphone connects to the Xvive U3 transmitter, while the matching receiver connects to the mixer's second XLR microphone input. Two Pure Resonance Audio XLR-3 3ft male-to-female cables provide balanced connections between the Rolls mixer's left and right XLR outputs and the Yamaha amplifier's two input channels. The system also includes 100ft of West Penn AQ227 12/2 black Aquaseal speaker wire for connecting the two Bose loudspeakers. The 12 AWG stranded copper cable is compatible with the AMU108 barrier-strip terminals, which accept 10 to 18 AWG wire. The cable features Aquaseal water-blocking construction, a sunlight- and moisture-resistant jacket, and a direct-burial rating for suitable outdoor low-voltage installations. The total 100ft cable length must be divided between the two speaker runs according to the installation requirements. The mixer, amplifier, and other non-weather-rated electronic equipment should be installed in a dry, protected location, with final speaker positioning, wiring routes, and amplifier settings determined by the installation environment.
Sound System Features
- Complete baseball field sound system for Little League fields, softball fields, school athletic facilities, outdoor sports complexes, and public address applications
- Two Bose Professional ArenaMatch Utility AMU108 8" all-weather loudspeakers provide clear speech reinforcement and high-output foreground music
- IP55-rated loudspeakers feature rotatable 90° x 60° constant-directivity horns for consistent coverage across athletic fields and spectator areas
- 8" LF8 high-excursion woofers and EMB2S compression drivers provide detailed vocal reproduction and music playback
- 90 Hz - 16 kHz frequency response (-3 dB) with up to 121 dB calculated peak SPL per loudspeaker at 1 meter under AES free-field test conditions
- 200W long-term continuous power handling per loudspeaker under Bose Professional's Extended Lifecycle Test
- Integrated 70V/100V transformers with 8Ω bypass provide flexible loudspeaker configuration options
- Yamaha PX3 stereo power amplifier provides two output channels rated at 300W x 2 at 8Ω and 500W x 2 at 4Ω under specified burst-test conditions
- One Bose AMU108 loudspeaker connects to each Yamaha PX3 amplifier channel using the 8Ω bypass setting
- Built-in Yamaha DSP provides configurable EQ, crossover filters, delay, high-pass filtering, and output limiting for system adjustment and speaker protection
- Rolls RM169 professional 6-channel Bluetooth audio mixer provides two XLR microphone inputs, four stereo RCA source channels, and balanced XLR outputs
- Built-in Bluetooth connectivity supports wireless music streaming from compatible devices
- Two Pure Resonance Audio UC1S dynamic cardioid handheld microphones with quiet On/Off switches for play-by-play commentary, paging, and announcements
- Xvive U3 digital wireless microphone system includes one transmitter and one receiver for one wireless microphone connection with up to 90 ft line-of-sight range
- 24-bit/48 kHz digital wireless audio with up to 5 hours of rechargeable battery operation for the Xvive U3 transmitter and receiver
- AtlasIED DS7E desktop microphone stand provides adjustable height from 8" to 13" with a weighted cast-iron base
- Includes one Pure Resonance Audio XLR-25 balanced male-to-female microphone cable, 25ft, for the wired handheld microphone
- Includes two Pure Resonance Audio XLR-3 balanced male-to-female microphone cables, 3ft each, for mixer-to-amplifier connections
- Includes 100ft of West Penn AQ227 12/2 black Aquaseal speaker wire with stranded copper conductors and a sunlight- and moisture-resistant jacket for suitable outdoor speaker wiring installations
About the System Components
Bose Professional ArenaMatch Utility AMU108 8" IP55 Outdoor Loudspeakers
The Bose Professional ArenaMatch Utility AMU108 is a compact, two-way all-weather loudspeaker designed for high-output speech and music reinforcement in outdoor athletic facilities, stadiums, parks, and other commercial environments. Its 8" LF8 high-excursion woofer features a 2" voice coil, while the EMB2S high-frequency compression driver uses a titanium diaphragm and neodymium magnet for detailed high-frequency reproduction. A rotatable 90° x 60° constant-directivity horn and optimized passive crossover provide consistent coverage and tonal balance. The AMU108 offers 200W long-term continuous power handling under Bose Professional's Extended Lifecycle Test, a 90 Hz - 16 kHz frequency response (-3 dB), and an 80 Hz - 18 kHz frequency range (-10 dB). Its integrated 70V/100V transformer includes an 8Ω bypass setting for low-impedance operation. The exterior-grade plywood enclosure features a protective weather-resistant coating, three-layer stainless steel grille, water-resistant woofer, and IP55 weather rating for direct-exposure outdoor installations. Each loudspeaker includes a stainless steel U-bracket and protective input cover for mounting and wiring.
Rolls RM169 Professional 6-Channel Bluetooth Audio Mixer
The Rolls RM169 is a professional 6-channel Bluetooth audio mixer designed for installations requiring multiple microphone and music sources. It features two balanced XLR microphone inputs with individually switchable 15V phantom power, four stereo RCA source inputs, and a front-panel 3.5 mm stereo input that parallels the fourth source channel. Built-in Bluetooth provides wireless music playback from compatible devices, with its level controlled through source channel four. Balanced XLR and unbalanced RCA main outputs support connections to external power amplifiers, including the Yamaha PX3. Additional features include independent microphone level and tone controls, source level controls, a 1/4" TRS microphone effects insert, and a front-panel headphone output with volume control. Its compact 1U rackmount design is suitable for press boxes, equipment racks, and other protected audio equipment locations.
Yamaha PX3 Stereo Power Amplifier 300W x 2 at 8Ω / 500W x 2 at 4Ω
The Yamaha PX3 is a professional stereo power amplifier that combines a Class-D amplifier engine with digital signal processing for installed and live sound reinforcement applications. It delivers 300W x 2 at 8Ω or 500W x 2 at 4Ω under Yamaha's specified 1 kHz, 20 ms non-clipping burst-test conditions. The amplifier features onboard parametric EQ, crossover functions, high-pass and low-pass filters, delay, and output limiting for flexible system configuration and loudspeaker protection. Yamaha speaker presets, basic and advanced setup modes, and panel-locking functions support convenient operation and system management. Balanced XLR and 1/4" TRS inputs, along with speakON, binding post, and 1/4" speaker outputs, provide multiple connection options. In this system, the PX3 powers the two Bose Professional AMU108 loudspeakers on separate amplifier channels, with each speaker configured for 8Ω bypass operation and appropriate DSP protection settings.
Pure Resonance Audio UC1S Ultra-Clear Dynamic Vocal Microphones with On/Off Switch
The Pure Resonance Audio UC1S Ultra-Clear handheld dynamic microphone is designed for play-by-play announcements, paging, public address, and vocal applications in schools, sports facilities, and commercial environments. Its cardioid unidirectional pickup pattern focuses on the primary sound source while reducing pickup of surrounding noise, making it suitable for spoken announcements in active athletic environments. The UC1S features a frequency response of 50 Hz - 16 kHz with a midrange presence rise tailored for vocal clarity. A heavy-duty housing, durable steel mesh grille, built-in wind and breath pop filter, and ultra-quiet On/Off switch provide dependable performance for frequent use. Each microphone includes a break-resistant microphone clip for mounting to a compatible stand. This system includes two UC1S microphones for one wired and one wireless microphone connection using the included Xvive U3 system.
Xvive U3 2.4 GHz Digital Wireless Microphone System
The Xvive U3 is a compact 2.4 GHz digital wireless microphone system designed to convert a compatible XLR handheld microphone into a wireless microphone. It includes one U3T plug-on transmitter and one U3R receiver, allowing a single microphone to transmit audio wirelessly to the Rolls RM169 mixer. The system supports high-resolution 24-bit/48 kHz digital audio with a 20 Hz - 20 kHz frequency response, six selectable wireless channels, and approximately 5 ms latency. Its rechargeable lithium-ion batteries provide up to 5 hours of operation for both transmitter and receiver, while the wireless range extends up to 90 ft line of sight under suitable RF conditions. The U3 supports compatible dynamic and battery-powered condenser microphones and can operate alongside additional U3 systems on separate channels when purchased separately. The included transmitter and receiver provide one wireless microphone channel for this baseball field sound system. As with other 2.4 GHz wireless equipment, local Wi-Fi, Bluetooth devices, and RF interference may affect operating range and performance.
