Dirac Live ART vs bass traps: what active room treatment can and cannot fix

Ordinary room correction, including Dirac's own Room Correction module, works speaker by speaker. Each channel gets its own filter, fitted to how that one speaker measures in the room. The speakers never help each other.

ART changes that below 150 Hz. Each channel is still corrected on its own, but a portion of its bass is also sent, reprocessed, to the other speakers and subwoofers. Every speaker with usable output in that range is recruited to support the others, and there is no longer a bass management crossover in the usual sense: each speaker plays as low as it can and the rest fill in. The point of the coordination is to control the sound field in the room rather than the response of one box.

• Range: 20 Hz to 150 Hz. Above that, ART is not doing anything; the full-range correction you hear is the ordinary Room Correction module.
• Minimum setup: two speakers. Dirac says it works with plain stereo and gets more effective as you add independent speakers and subwoofers. Each subwoofer needs its own output channel for this.
• Room size: Dirac gives roughly 12 to 100 square metres as the range it performs best in.
• Hardware: an ART-certified AV receiver or processor, or, since 2026, the Dirac Live software on a Windows or Mac computer. Either way you need the Room Correction licence, the ART add-on, and an omnidirectional measurement microphone; Bass Control as well if you use subwoofers.

The guide on what EQ can and cannot fix on this site draws one line: a filter on a single speaker can lower a resonance, but it cannot fill a cancellation, and it cannot reach decay that the room adds on its own. ART moves that line, because it is no longer one speaker with one filter.

• Decay, not just level. A cut on one speaker feeds a mode less energy. Several speakers coordinated against the same mode can actively work against it, which is why Dirac's headline claim is reduced decay time and not only a flatter curve.
• More than one seat. Single-speaker EQ fits an average and leaves each seat somewhere around it. Dirac states that ART reduces spatial variation and reproduces the target more accurately at each measured position, which is the problem that otherwise needs multiple subwoofers and careful placement.
• Bass that holds up with level. Because the correction is applied to the signal, it scales with volume. Stereophile reports being able to turn the music up without the room's bass taking over.

A bass trap removes energy from the room. ART redistributes the energy the speakers put in. In the modal region those can produce similar results at the listening positions you measured, which is why the comparison is worth making at all. Outside that region, and outside those positions, they are different tools.

Traps also work for every source and every listener position at once, need no particular processor, and keep working if you move the speakers. ART works only where you measured and only for audio that passes through Dirac. On a computer that means PCM up to 32-bit/192 kHz; anything higher is downsampled.

The decision is less either-or than the marketing suggests, because ART only covers part of what a room needs.

1. 1.Move the seat and the speakers first. Free, and it decides how much any correction has to do.
2. 2.Treat the first reflection points with broadband absorption either way. ART does nothing above 150 Hz, so imaging and midrange clarity are still the room's.
3. 3.For the bass, choose by constraint. If you cannot put large traps in the corners, ART is the most capable electronic alternative available to a home listener. If you can, traps keep working regardless of what is playing.
4. 4.Measure again with REW, from the same positions, with ART on and with it bypassed.

The waterfall is where the difference should show. ART is supposed to shorten how long the bass rings, so compare the low end of two waterfalls made with identical settings. The guide to what a REW waterfall plot is telling you explains how to read one, and the analyser on this site will flag excess decay in either measurement.