Sony ULT TOWER 9AC Party Speaker – SRS-ULT900AC

The Sony ULT TOWER 9AC (SRS-ULT900AC) is a large-format, AC-powered party speaker made for big rooms, gyms, and events. It delivers 360° Party Sound and Light with an X-Balanced woofer and multiple tweeters, plus simple ULT1 / ULT2 bass modes for either deep low-end or punchy, high-impact bass. With mic and guitar inputs and an optical TV connection, it doubles as a karaoke and event PA solution. AC power only (no battery). :contentReference[oaicite:0]{index=0}

At a glance

• Connection: Bluetooth wireless + wired inputs
• Power: AC only (no internal battery)
• Speaker design: 3-way, multi-driver for 360° sound
• Drivers: 1 × X-Balanced woofer, 2 × midrange, 2 × front tweeters, 2 × rear tweeters
• Bass modes: ULT1 (deeper low bass) / ULT2 (punchy power bass) via dedicated ULT button
• Lighting: 360° multi-color party lights
• 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 (5V / max 1.5A)
• EQ: 10-band custom EQ in Sony Sound Connect app
• Mobility: Built-in handle + castor wheels
• Dimensions: approx. 410 × 910 × 456 mm (16.2" × 35.9" × 18.0")
• Weight: approx. 28.5 kg (62.8 lb)

Some specs may vary slightly by region; above aligns to Sony support + major retail spec sheets.

Key features

• 360° Party Sound fills large spaces with consistent coverage front to back.
• ULT bass modes switch instantly between:
  • ULT1: deeper, lower-frequency bass for big low-end feel.
  • ULT2: stronger sound pressure and punchier bass impact.
• TV Sound Booster via Optical In turns it into a serious big-room TV speaker.
• Karaoke & guitar ready with dual 1/4" inputs and vocal-friendly tuning.
• Party lighting system synced to music for events and performances.

Compatibility and setup

Use Bluetooth for quick wireless pairing, or connect devices via 3.5 mm audio-in. For TVs or projectors, Optical In (PCM) provides a clean direct link. The rear panel includes two 6.3 mm mic/guitar inputs for karaoke, assemblies, or live performance. USB-A supports music playback from flash drives and can also 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
• Large classrooms, multipurpose rooms, and auditoriums
• TV / projector audio boosting for events or media rooms

Buyer notes

• AC power only: Designed for venues with outlets; if you need battery operation, look at the non-AC ULT Tower model. :contentReference[oaicite:4]{index=4}
• Big + heavy: Wheels and handle help, but this is a large-space speaker (28.5 kg).
• Mic not included: Add compatible wired 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.