ToTo Man
the band not the dog
I used the "mirror on the wall" technique for the side wall reflection points.@ToTo Man , are you using this early-reflection zone calculator?
https://www.acoustic.ua/forms/calculator4.en.html
I used the "mirror on the wall" technique for the side wall reflection points.@ToTo Man , are you using this early-reflection zone calculator?
https://www.acoustic.ua/forms/calculator4.en.html
Lspk measurement for "33% rule" overlaid onto Lspk measurement for "Cardas" and Rspk measurement for "33% rule" overlaid onto Rspk measurement for "Cardas"? Or do you want L+R Avg for "33% Rule" overlaid onto L+R Avg for "Cardas"?Could you produce a plot with "33% rule" and "Cardas", L & R single speaker, psychoacoustic smoothing?
Lspk measurement for "33% rule" overlaid onto Lspk measurement for "Cardas" and Rspk measurement for "33% rule" overlaid onto Rspk measurement for "Cardas"? Or do you want L+R Avg for "33% Rule" overlaid onto L+R Avg for "Cardas"?
L-spk "33% rule" overlaid onto "Cardas" and R-spk "33% rule" overlaid onto "Cardas" if possible. Perhaps a single speaker if that is possible.
I used the "mirror on the wall" technique for the side wall reflection points.
33% looks more balanced to me, both individual speaker and average.
Does it sound good with EQ'ed bass peaks?
Maybe you can tame down the BBC dip a little with a judicious mix of toe-in and side panels? (if you don't like what it does perceptually)
The online calculator will give you an idea of the width of the reflection zone (how wide an area you need to treat).
When you say "BBC dip" do you mean the 'saddle' between 2kHz-4kHz? That's part of the Dittons tuning, treating the side walls reduces midrange and treble output including the 2kHz-4kHz area so I'm not sure how that would help?
That's interesting, I'll need to read more into this as I'm still not sure I fully understand its implications.The "saddle" happens mostly because of the tweeter's wide dispersion at the bottom of it's passband, or just above the "saddle" which is just below where the mid crosses to the tweeter (5kHz).
If you absorb that off-axis energy you will get a flatter response at the listening spot (as much as it is possible).
This plot is from my own speaker, and you can clearly see the excess energy of the lower tweeter off-axis where the mid-woofer transitions to it, at around 4.5kHz.
This is quite typical of speakers with non-waveguided tweeters, particularly when a large mid or mid-woofer is used.
I think I'm just going to have to live with this until I’m able to DIY a bass trap that rolls-off above 100Hz.