Audyssey vs Dirac Live: Is the Upgrade Worth $349?
Audyssey came free with your receiver. Dirac Live costs $259 to $349 on top. Here is what the money actually buys, which rooms need it, and when Audyssey XT32 is already enough.
REW vs Dirac Live: Which Room Correction Should You Use?
One is a free measurement toolkit that rewards tinkering. The other is a paid, hands-off correction engine. The right pick depends on how much you want to learn.
If you’ve measured your room once, you already know the truth: the room does more damage to your sound than almost any gear upgrade can fix. REW and Dirac Live are the two names you’ll hear most for fixing it, but they’re very different tools solving the problem from opposite ends. For the wider landscape, see my room correction guide; this is the head-to-head.
The one-line difference
- REW (Room EQ Wizard) is a free, hands-on measurement toolkit. It shows you exactly what your room is doing and gives you total flexibility, but you interpret the data and apply the EQ.
- Dirac Live is a paid, automated correction engine. It measures, analyzes, and generates a correction filter for you, but it needs compatible hardware and costs money.
REW: free, powerful, and a learning curve
REW is the gold standard for measuring a room, and it costs nothing. It runs on Windows, Mac, and Linux, takes detailed measurements with a calibrated mic (a UMIK-1 is the usual pick), and shows you frequency response, decay, distortion, everything.
The catch: REW corrects nothing automatically. It uses IIR filters and hands you the data; you decide what to fix and apply it yourself (via a miniDSP, your AVR’s PEQ, convolution, etc.). For people who like to learn and tinker, that flexibility is the whole appeal. For people who just want better sound now, it’s homework.
Dirac Live: hands-off, but it costs
Dirac Live flips the model. You take a guided set of (typically nine) measurements around your seat, and its algorithm generates a correction filter automatically. Crucially, it uses mixed-phase filtering, a blend of IIR and FIR, which can correct timing problems REW’s IIR-only approach can’t touch as cleanly.
The trade-offs: it costs around $349 (sometimes bundled into compatible gear), and it requires Dirac-compatible hardware, an AVR, processor, or miniDSP that can run the filter. You’re paying for automation and a more sophisticated algorithm, and giving up REW’s open-ended flexibility.
Which should you use?
| If you… | Use |
|---|---|
| Want it free and love to learn/tinker | REW |
| Need full measurement flexibility | REW |
| Want hands-off, automatic correction | Dirac Live |
| Already own Dirac-compatible hardware | Dirac Live |
| Care about phase/timing correction | Dirac Live |
Honestly, they’re not mutually exclusive, plenty of people measure with REW (because it’s the best free analysis tool) and correct with Dirac (because it’s the easier engine). REW first to understand your room, Dirac to fix it without a degree.
REW alternatives worth knowing
REW isn’t the only free or low-cost path, and if you are weighing this from the other direction, I have gone through every Dirac Live alternative and what each one actually costs in more detail:
- HouseCurve (iOS), measure and generate PEQ right from your phone. See my HouseCurve guide.
- REW plus a calibrated USB microphone, the route I actually use. Which mic is a real question: UMIK-1 vs UMIK-2.
- A WiiM streamer’s built-in room correction, automated correction with no extra software, on iOS and Android.
- Audyssey / ARC Genesis, built into many AV receivers. If you already own a Denon or Marantz, the real question is whether a Dirac licence beats what came free in the box: see Audyssey vs Dirac Live.
- Sonarworks, popular with the headphone and studio crowd.
For the full menu from phone apps to Dirac Live ART, read the room correction guide.
Frequently asked questions
What's the difference between REW and Dirac Live?
- REW (Room EQ Wizard) is a free, hands-on measurement toolkit: it shows exactly what your room does but leaves you to interpret the data and apply EQ yourself. Dirac Live is a paid, automated correction engine that measures, analyzes, and generates a correction filter for you, but it needs compatible hardware.
How much does Dirac Live cost?
- Dirac Live runs around $349, sometimes bundled into compatible gear, and it requires Dirac-compatible hardware such as an AVR, processor, or miniDSP to run the filter. REW, by contrast, is completely free and cross-platform; you only pay for a measurement mic like a UMIK-1.
Is REW or Dirac Live better?
- Neither wins outright; they solve the problem from opposite ends. Choose REW if you want it free and enjoy learning and tinkering, or need full measurement flexibility. Choose Dirac Live if you want hands-off automatic correction, already own compatible hardware, or care about phase and timing correction.
Can I use REW and Dirac Live together?
- Yes, and plenty of people do. REW is the best free tool for analyzing your room, so you measure with it to understand what is happening, then use Dirac Live as the easier engine to apply correction. REW first to learn your room, Dirac to fix it without a degree.
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