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Axiom EP400 Epicenter 8-Inch Powered Subwoofer - Short Review

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Axiom EP400 Powered Subwoofer - Front View

Axiom EP400 Powered Subwoofer - Front View

Photo (c) 2007 - Robert Silva - Licensed to About.com

The Bottom Line

The AXIOM EP400 is a powerful subwoofer despite its small size. The AXIOM EP400 delivers power, clarity, tightness, and undistorted deep bass response for both movies and music. This subwoofer also offers several controls that allow the user to tweak performance parameters to specific room environments and listening tastes. My impression of the EP400 is extremely postive, making this subwoofer a real winner, especially for those looking for a high-performance subwoofer in a smaller room.

After reading this review, also check out a close-up photo look and explanation of the the EP400's connections and controls.


  • Excellent bass response for an 8-inch Driver.
  • Small cabinet footprint - Can be placed easily within room decor.
  • Large power output.
  • Easy to understand user manual.
  • Both rubber (for bare floors) and metal ( for carpets) feet provided.


  • No wireless remote control capability at the present time.
  • No through connection output via standard high-level speaker connections.
  • Very heavy for its size - Use caution when moving or lifting.
  • Expensive for an 8-Inch driver design.


  • Enclosure type Sealed/Acoustic Suspension; Front 8-inch Firing-firing main Driver.
  • Digital Signal Processing (DSP) optimizes performance across all volume levels and differing room characteristics.
  • Frequency response 25Hz-150Hz +/- 3dB. This means that extreme low frequencies are reproduced accurately.
  • Power handling - 500 Watts. This means that the EP400 has a consistent high-power output
  • Crossover - Settings at 40, 60, 80, and 100Hz. Frequencies below the crossover point are reproduced by the subwoofer.
  • Phase 0-180 degrees; used to match in-out motion of the sub to the in-out motion of the rest of the speakers.
  • Input/Output - 2 line level/RCA phono jacks (1in/1out), 2 line level XLR jacks (1in/1out), 1 set of speaker input terminals.
  • Controls: Gain, Phase, Crossover (Defeatable), and Trim Controls.
  • USB Port provides for software/firmware updates.
  • Dimensions - 13.75 inches High x 10.5 inches Wide x 16.8 inches deep. Weight - 48.55 lbs.

Guide Review - Axiom EP400 Epicenter 8-Inch Powered Subwoofer - Short Review

The Axiom EP400 is a compact, but heavy, sealed unit (no port) with a powerful built-in low frequency amplifier. The driver is front firing. The rear panel has the connections and controls.

This subwoofer has several adjustments, including Phase (which matches the in/out subwoofer driver motion to the satellite speakers), Volume (Gain), and Crossover (sets the point at which you want the subwoofer to produce low frequency sounds, against the ability of the the satellite speakers to reproduce low frequency sounds), and a Room Size setting.

The controls allow precise matching to a variety of satellite speaker types. The only downside: All controls are on the back of the subwoofer panel, and there is no remote control that allows adjustments to be made from your listening position.

The EP400 produced excellent, very deep, tight bassm especially for its small size. This subwoofer proved to be an excellent match for the rest of the speakers. With Blu-ray/HD-DVD/DVD soundtracks that have LFE effects, such as Superman Returns, Alien vs Predator, King Kong, Pirates of the Caribbean 1&2, and Godzilla (1998), the subwoofer showed no fatigue or drop-off, producing all LFE effects at full impact.

On music-based material, the EP400 reproduced deep bass response on several notable bass-notable cuts that I use as a standard in my subwoofer reviews, such as a sliding bass riff on Heart's Magic Man, the Eric Kunzel/Telarc recording of the 1812 Overture, and Pink Floyd's Dark Side of the Moon.

The subwoofer mixed well with the rest of the speakers in several test speaker setups; crossover adjustment was fairly easy. However, I would recommend using a Sound Meter to assist in fine tuning your speaker system levels.

Despite its small 8-inch driver size, the EP400 produces solid, deep bass.

Disclosure: Review samples were provided by the manufacturer. For more information, please see our Ethics Policy.
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