Ultra room correction results

[Musician]

You will get slightly better results in the bass with Dayton imm6 If using the lightning dongle from Apple ( 10 dollars ) with your iPhone or iPad because you have a direct digital connection to the WiiM app without going through compression and limit algorithms through the earphone socket of older iphones. The dongle has an AD converter flat within 1 dB 20-20000 Hz.

I use Line audio OM1 ( flat within +-1 dB 20-20000 Hz ) with Audient id14 for comparisons and my Imm6 without calibration file looks very similar between 40-3500 Hz so its definitely good enough to be used.

The imm6 has a little bump ( 2-3 dB ) at 4 kHz Hz and this depends on the shape of the mic , with the extra pin sticking out, and reflections from it. Also some interference from the shape of the iPhone itself.

One can use the roomcorrection with the default settings 40-4000 Hz and imm6 and just null the eventual corrections made above 3500 Hz , then save it.

Or set it 40-3500 Hz.

Edit: measurement corrections at 3 KHz from listening position is only usable If one sits exactly at the sweetspot all the time, and If you have rather long distances from the sidewalls. If you move 20 cm, the soundresult will be worse than without correction.

Again - the way doing corrections in the right way is:

1. Get a good measurements mic, a soundinterface and a microphone stand.

2. Measure frequency response from listening position using WiiM roomcorrection , the mic and the interface with a lightning usb cable connected to an ipad/iPhone with frequency span in the WiiM roomcorrection app set at 40-300 Hz . If you have flat measuring speakers with good directivity then you can stop your measurements here. Dont correct anything above 300 Hz.

If your speakers are non flat above 300 Hz ( anechoic ) :

3. Measure your individual speaker , one at a time ( the other turned off ) at 1 meter distance on axis and 15 degrees off axis and use the average function in REW or audiotools. Use a microphone stand and a thick rug below the speaker.
Look at the result between 300-20000 Hz. Now you can correct your speakers frequency response above schroeder.

4. Print those measurements numbers in the WiiM app PEQ as corrections above 300 Hz .

Now you will have a measurement result that mirrors what your ears hear at listening position, eliminating the precedence effect above shroeder frequency.

For stereo system corrections using two speakers you want + 1.5 dB Q=3 at 1.7 KHz and -1 dB Q=3 at 3.5 kHz. To get that, you must measure each speaker from 1 meter distance ( the other turned off )

 

[Musician]

Because of the precedence effect, ( the ear/brain hear different at a certain distance than a microphone ) I strongly recommend everyone to play around with the numbers after the room correction is done . One can :

1. In the WiiM roomcorrection app, print in half of all the measured values = If the room correction says +8 dB Q=3 at 244 Hz , instead you print +4 dB. Continue doing this with all values.

Save the new settings ( so now you have two ) and compare with the old room correction measurements. Use the one that sounds the best.


2. Use the shelving filtering below 80 Hz and above 3 kHz = 1 dB + or - can make a big difference If you have bright or thin sounding speakers. Play around with the shelving filter, its very useful.