Sony ULT TOWER 9 Wireless Party Speaker – SRS-ULT900

The Sony ULT TOWER 9 (SRS-ULT900) is a large-format, battery-powered party speaker built for big spaces like gyms, multipurpose rooms, auditoriums, and outdoor events. It delivers 360° Party Sound and Light with an X-Balanced woofer and multi-tweeter layout, plus a dedicated ULT button that toggles two bass modes for either deep low-end feel or punchy, high-impact sound. With mic and guitar inputs and an optical TV connection, it doubles as an event PA, karaoke system, and boosted TV speaker. :contentReference[oaicite:0]{index=0}

At a glance

• Connection: Bluetooth wireless + wired inputs
• Power: Internal rechargeable battery
• Battery life: Up to ~25 hours playback*
• Quick charge: ~10 min charge = up to ~3 hours playback
• Speaker design: 3-way, multi-driver for 360° coverage
• Drivers: 1 × X-Balanced woofer, 2 × midrange, 2 × front tweeters, 2 × rear tweeters
• Bass modes: ULT1 (deep low bass) / ULT2 (punchy power bass)
• Lighting: 360° multi-color party lights
• Bluetooth: Version 5.3
• Supported codecs: SBC, AAC, LDAC
• Inputs: 3.5 mm audio-in, Optical (PCM) TV input, USB-A (music playback)
• Mic / instrument: 2 × 6.3 mm (1/4") inputs: MIC1 and MIC2/GUITAR
• USB out: USB-A device charging (phone/tablet power)
• App: Sony Sound Connect (10-band EQ, lighting, Party Connect)
• Mobility: Built-in handle + castor wheels
• Dimensions: approx. 410 × 910 × 456 mm (16.1" × 35.8" × 18.0")
• Weight: approx. 28.5 kg (62.8 lb)

*Battery life varies by volume, lighting use, and playback source.

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Key features

• 360° Party Sound spreads audio evenly across large rooms so everyone hears it clearly.
• ULT bass modes switch instantly:
  • ULT1: deeper, lower-frequency bass for a big low-end “feel.”
  • ULT2: stronger sound pressure and punchier bass for high-energy events.
• X-Balanced Speaker Unit + multi-tweeter array produces powerful bass without muddying vocals.
• TV Sound Booster via Optical In delivers a major jump in audio for assemblies or movie nights.
• Karaoke & guitar ready with dual 1/4" inputs and easy level control.
• 360° Party Lights synced to music to energize performances and events.

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Compatibility and setup

Pair wirelessly over Bluetooth for fast setup, or connect devices through the 3.5 mm audio-in. For TVs/projectors, use Optical In (PCM). The rear panel includes two 6.3 mm mic/guitar inputs for karaoke, speeches, or live performance. USB-A supports music playback from a flash drive and can charge a phone during use. :contentReference[oaicite:3]{index=3}

Best use cases

• School assemblies, dances, pep rallies, and gym events
• Karaoke nights, talent shows, and performing arts programs
• Outdoor events where AC power isn’t guaranteed
• Large classrooms, multipurpose rooms, and auditoriums
• TV / projector audio boosting for movie nights or presentations

Buyer notes

• Battery-powered model: This version is portable with onboard battery. If you want a lower-cost AC-only unit, that’s the SRS-ULT900AC. :contentReference[oaicite:4]{index=4}
• Big and heavy: Built for large spaces; wheels and handle make transport easier.
• Mics optional: Add compatible wired mics or Sony ULT wireless mics depending on your setup.

Purchasing for schools and districts

Learning Headphones supports purchase orders, tax-exempt checkout, and volume pricing. If you’re building event kits or auditorium/gym audio setups, our team can help confirm the right ULT speaker + mic package for your space.