Leq Demystified: Managing Your “Sound Budget”
In modern festival and outdoor mixing, you are no longer mixing just for the song or the crowd in front of you — you are mixing to a Leq (Equivalent Continuous Sound Level).
Think of Leq as a sound-energy budget that must last over a defined time window, typically 10, 15, or 60 minutes. Once that budget is spent, it does not matter how musical or justified the moment felt — the meter has no sympathy.
The Maths Behind the Average (Why One Loud Song Hurts)
Example (illustrative):
If your limit is 99 dB L_Aeq,15 and you mix at 102 dB(A) for the first 5 minutes, you have already burned a significant portion of your 15-minute budget. To remain compliant, you would need to mix at roughly 96 dB(A) for the remaining 10 minutes to land back near the target.
This example is intentionally simplified to demonstrate the principle. The exact break-even level depends on the full logarithmic energy calculation, but the takeaway is always the same: a few loud minutes cost far more than they feel like in the moment.
A Practical Leq Workflow
Monitor the Trend, Not Just the Number
In Smaart v9 SPL, keep the Leq History window visible. Watching where the average is heading is far more useful than reacting to where it happens to be right now.
Quiet the Gaps
Between-song banter, walk-on music, and changeovers should be noticeably lower in level. These moments add little artistic value but can quietly save a surprising amount of Leq.
Mix Proactively, Not Defensively
Use the Remaining Budget metric. It shows how much level you can still afford before the limit is reached, allowing you to plan ahead instead of panic-pulling the master fader when a warning light appears.
For productions using monitoring, platforms like 10EaZy make it particularly easy to stay within your SPL budget by combining continuous logging, clear limit visibility, and compliance reporting in one system.
Pro Tip: 10EaZy integrates very easily (that´s a lot of easy here) into your Smaart environment,
The Takeaway
Leq management is not about mixing quietly — it is about mixing intelligently.
Treat your allowed Leq like fuel in a tank, and you will finish the set strong, compliant, and fully in control of the sound.
Smaart is excellent on its own, but most users find they get much more out of it after some structured training. That’s where our seminars come in. At TZ Audio we run practical seminars, both online and in-venue. We offer seminar-only or full “all you need packages” including software & hardware. It’s simply the fastest way to become comfortable and confident with the measuring a sound system.
If you’re in Norway, Sweden, Denmark or Iceland – or elsewhere – we offer is online seminars and traveling to Norway is a valid option too of course. We’re here if you have any questions about the software or upcoming seminars.
Thanks for reading!