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Two compact black bookshelf speakers with mounting brackets

Acoustic Audio

Acoustic Audio AA321B 400 W Black Bookshelf Speaker Pair

SKU CH-3EH7-TCZBY

Compact passive bookshelf pair with 2.5" woofers, 150 Hz–20 kHz response and 88 dB sensitivity for 20–200 W amplifiers

  • TypeOn-Wall Speakers
  • Full-range clarity from 2.5" polypropylene woofers
  • 88 dB sensitivity delivers loud output with modest amp power
  • Frequency response covers 150 Hz to 20 kHz for balanced sound
  • Omni-directional brackets with hardware make wall mounting simple
  • Compact 3.5" x 3.5" x 4.5" cabinets fit tight spaces

Compact Passive Pair for Indoor Installations

The Acoustic Audio AA321B is a pair of passive bookshelf speakers rated at 400 watts peak power. Each unit uses a 2.5 inch polypropylene woofer in a sealed ABS cabinet. The frequency response spans 150 Hz to 20 kHz at 88 dB sensitivity with an 8 ohm load. They are designed for indoor surround sound, whole-house audio or commercial background music systems.

Requires External Amplification and Speaker Wire

These speakers need an amplifier or receiver supplying between 20 and 200 watts per channel through raw speaker wire outputs. CL3-rated or standard raw speaker wire completes the connection to the spring-loaded terminals. The sealed cabinets and included omni-directional mounting brackets with hardware allow flexible wall or shelf placement without needing a dedicated equipment rack or floor space.

Brackets and Manual Enable Immediate Mounting

The box contains two passive speakers, mounting brackets with all necessary hardware and an instruction manual. The brackets let installers angle each cabinet for optimal coverage in surround or distributed-audio layouts. No wireless modules, streaming apps or proprietary calibration software are included, so the system relies entirely on the connected amplifier for signal processing and control. Not rated for outdoor use.

Highlights

  • Full-range clarity from 2.5" polypropylene woofers
  • 88 dB sensitivity delivers loud output with modest amp power
  • Frequency response covers 150 Hz to 20 kHz for balanced sound
  • Omni-directional brackets with hardware make wall mounting simple
  • Compact 3.5" x 3.5" x 4.5" cabinets fit tight spaces

Specifications

BrandAcoustic Audio by Goldwood
TypeOn-Wall Speakers

Questions about this item

What amplifier power range does the 400 W rating actually require?

The speakers need an amplifier delivering 20 to 200 watts per channel into 8 ohms.

How much heat or noise do the passive cabinets add to a room running all day?

As passive speakers they generate no heat or noise themselves; only the connected amplifier contributes.

Which cables and connectors must I already have to wire the spring-loaded terminals?

You need CL3 or raw speaker wire with stripped ends for the spring-loaded connectors.

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