ADI-2’s EQ works great for room correction.

What you need is a measurement tool for room acoustics.

I suggest FFT from Andrew Smith, out of the Audio Tools suite, for iDevice.
https://apps.apple.com/de/app/fft/id298840058

For just 12 bucks it turns an iDevice into a calibrated, full fledged measurement system.

It’s a visual and interactive process, very straight forward.
You flatten the displayed curve by setting an inverted EQ curve, while seeing the resulting changes in realtime.

If you decide to get AudioTools I can give you a tutorial.

There are other apps like REW that deliver EQ settings, but these need an invest into a measurement mic, and some time to learn how to use them.

Look here for a basic measurement instruction, in the context of subwoofer integration:

https://forum.rme-audio.de/viewtopic.ph … 12#p155312

To do a measurement needs to define a goal in the first place:

• Linearizing a full range speaker is done in the nearfield of the speaker, 50-100 cm distance on listening axis, equidistant between tweeter and midrange driver, to exclude wall/room reflections.

• Improving the room response only works in the low frequency range, up to ca. 250 Hz.
This is done with the measurement mic at the listening position.

• Same for integration of a sub.

Why is that:
A measurement mic does NOT differentiate between direct and wall reflected sounds.
The human auditorial system DOES, the direct sound from the speaker largely dominates the reception, room sounds are kind of “excluded” subjectively.
Only at low frequencies this mechanism’s efficiency is reduced.

In typical domestic rooms the direct/reflected ration reaches 50:50% (the “reverberation radius”) at a distance of 50-100 cm from the source.
To mostly look at the source, not the room, you have to measure that close to a speaker.

• Typical settings for FFT app:
(Not mentioned parameters should stay at default)

FFT Settings (wrench symbol):
FFT Size: Equal Points / Octave EPPO
dB Range for 1 dB Scale: 30 dB
Advanced:FFT Settings: Blackman: Overlap 90%

Graph settings:
Graph Smoothing 1/3 Octave
Graph Decay 8s Decay, or Average (for precise results an 20-30s run can be averaged, needs a restart for each run)

Thank you for this! I'm happy with he speaker's response (ATCs), it's the room I want to measure and hopefully improve a bit (even if only below 250Hz), so will buy the Audiotools set and give it a go in the new year.

Would it also be possible to do it without the iPhone + app and just use a good omni measurement mic at the listening position, pink noise to the monitors, then RME EQ to flat while watching the mic return into a high quality FFT on the main screen/PC/DAW?

Thanks, I might try and give it a go without the app first then. I'd be using a pretty flat, very low noise AT 4022 omni mic, which I'm sure would be better than most cheaper measurement mics, and a super flat and low noise Elysia Skulptur preamp. I can easily generate the pink noise to the ATCs, and I'd use either Voxengo Span Plus or TDR Prism as the analyser.

Audiotools does look great though (and only twice the price of the FFT by itself, for way more tools), so will keep studying their website, loads of great info there!