Hi all, I am making this thread for two reasons. Firstly, to share my tune in case anyone is interest. Secondly, to get feedback.
For the settings in REW RTA:
Mode: RTA 1/6 Octave
FFT Length: 16384
Averages: Forever
Window: Hann
Max Overlap: 93.75%
Update Interval: 1
Anything wrong there?
Umik-1, Andy's Curves, Jazzi's Spreadsheet, Frogs, DSP408.
My pink noise tracks I think I got from Skizer and burned to a CD. My truck is the last year with a CD player.
My technique is just to do small circles with the mic around my left ear for 10 seconds or so and right ear for about 10 seconds while the RTA runs and then I hit stop, and save the current values.
I did some test calibration with the GB25's first. This is basically just to learn and see how they respond and get a feel for what I was doing.
These mids fire from my A-pillar.
I currently have them set to play from 300hz-3500 hz.
I was getting this massive peak at 700k. It sounded really bad before the tune.
I used a match range wider than the crossover settings:
175 to 4500 hz.
Not sure exactly where this should be. Skizer had said in a video to tune outside the crossover range, so that is what I tried to do.
I set the slopes in the crossover setting in REW to 0 and the speaker type to none to try to eliminate REW from modifying the curves the spreadsheet had generated.
I did a flatness target of 1 dB, I think 2 would probably have been better.
Max boost was set to 12 dB.
This is what I ended up with after 2 iterations:
The first iteration I just tried to remove that 700hz peak with the EQ it recommended in that region.
Then I ran it again once that was fixed.
Much better. It sounded pretty good. I ran out of EQ bands in the DSP, so I just used the ones that would correct the biggest errors.
I realized that I had the crossover set to 4k in the DSP instead of 3500, so I will fix that when I try the tune again.
I've heard some people say there is a lot of skill involved in tuning with a more limited number of DSP bands.
If there is some benefit to upgrading my DSP to something with more bands, like a Helix, please let me know.
I don't know how exact it needs to be for the ears to hear the difference. I have heard 2 dB is audible?
One thing I did notice is that I had pretty dramatic differences between the peaks when the mic was at my left ear vs the right and that they tended to average down a bit as I ran the RTA for 10 seconds per ear.
So this is just preliminary stuff to go over what I did and the result so that I can fix any mistakes in my technique before I proceed with the other channels.
Obviously, the difficulty is going to compound as I try to match left/right and the different component speakers. So I want to make sure the basics are down first.
Appreciate any and all advice!
Thanks for reading.