Pinnacle Speakers, a unique family owned and operated business since 1976, designs and manufactures speakers famous for their sterling sound. Our products combine superior technologies with artistic expertise, supported by extended warranties, the longest of any major speaker brand. We are proud to provide a personal service philosophy that's unprecedented in these times, and in this highly automated world.

AC 400

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  • Video shielding allows placement near TV without interference
  • Hardware in place for easy wall-mount installation
  • 7 Year Transferable Warranty on parts & labor
  • Designed and Manufactured in the USA

System Type: 2-Way, 4th Order rear vented with patented Diaduct tuning

Component Drivers:

  • 3/4" liquid cooled polyamide dome tweeter
  • 4" fibercone woofer with rubber surround

Frequency Response: 60-21 kHz (+/- 3 dB)

Crossover Frequency: 5.5 kHz

Recommended Amplifier Power: 20-100 Watts RMS per channel

Operative Power Range: 5-50 Watts RMS Continuous, 150 Watts Peak

Sensitivity: 88 dB (2.83 Volts Pink Noise @ 1 Meter)

Nominal Impedance: 8 Ohms

Dimensions: 6" Wide x 9 1/4" High x 7" Deep

Finish: Premium Black Vinyl

Weight: 14 lbs. per pair




4" 2-Way Compact Bookshelf Speaker Rated #1 From The Leading Consumer Reporting Magazine! Great bass from our patented Diaduct port. Outstanding in your Home Theater system, or as a fullrange music speaker in your audio system. Try using 4 with a powered subwoofer and center channel for a great complete compact Home Theater system.


I have (these in a) surround system setup since 1996 and love them. - Chad Wherry

I own 4 AC400 bookshelf speakers which I absolutely love. - Curtis Hulett

Your speakers are AWESOME! - Bill Paplawsky

I just bought a pair of AC-400s and I am very impressed. Thanks for making such a quality speaker! - Mark Mielcarek

…dollar for dollar you are the best without a doubt!! - Smash7391

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