Selecting Crossover Frequencies for 3-way build

[DukeLeJeune]

Originally Posted by Bassmec

Probably makes me very sensitive to any cancellations caused by any Phase angle anomalies in my passive monitors, they can have a serious effect by causing cancelation dips in the crossover area frequency response.

If a speaker has a significant cancellation dip in the crossover region on-axis, then it has a design problem, in my opinion. But if you go far enough off-axis vertically (for horizontally aligned drivers) you are likely to find a cancellation dip even if the on-axis response is smooth.

[Bassmec]

Originally Posted by DukeLeJeune

If a speaker has a significant cancellation dip in the crossover region on-axis, then it has a design problem, in my opinion. But if you go far enough off-axis vertically (for horizontally aligned drivers) you are likely to find a cancellation dip even if the on-axis response is smooth.

I found exactly that problem, so I had a word with a boat builder mate (steady some of my best friends are boatbuilders) and gave him some drawings of some old wooden Vitavox 220 Hz multicellular horns and hey presto he whittled me up a pair:

which I have in at 24 dB @ 300Hz they are still going strong at 17.5 kHz so I don't have any crossover overlaps or off axis effects in the band around 1kHz to 3kHz where I am most sensitive about it.
Still I don't think the fearful boys would want you to fiddle about making anything that complex.
With the Coral M 105 driver and the JBL titanium diaphragm, I get just under 111dB 1 watt 1 mtr. So I don't need many midrange watts at all.

[DukeLeJeune]

Originally Posted by Bassmec

I found exactly that problem, so I had a word with a boat builder mate (steady some of my best friends are boatbuilders) and gave him some drawings of some old wooden Vitavox 220 Hz multicellular horns and hey presto he whittled me up a pair:

which I have in at 24 dB @ 300Hz they are still going strong at 17.5 kHz so I don't have any crossover overlaps or off axis effects in the band around 1kHz to 3kHz where I am most sensitive about it.
Still I don't think the fearful boys would want you to fiddle about making anything that complex.
With the Coral M 105 driver and the JBL titanium diaphragm, I get just under 111dB 1 watt 1 mtr. So I don't need many midrange watts at all.

Wow! Awesome!!

Yeah the part of the spectrum that I obsess over the most is 1-4.5 kHz, and in particular 3-4 kHz, as that's where the ear is most sensitive (not just in terms of perceived loudness, but also distortion perception). Your crossover is like an octave or more away! AND you solved the problem that wasn't solvable back in the day - you manage to go from your low crossover all the way up the spectrum without needing a separate tweeter to do so. Very nice system design choices!

[Arjank]

In my 210 I use an 8" coaxial(coincident) driver for the 400hz-20khz range. No off-axis phase issues here Very uniform powerresponse. If one cab shows the "real" sound of your instrument then this is it.

[Bassmec]

Originally Posted by Arjank

In my 210 I use an 8" coaxial(coincident) driver for the 400hz-20khz range. No off-axis phase issues here Very uniform powerresponse. If one cab shows the "real" sound of your instrument then this is it.

That's a very serious monitor I love the imaging of coaxial speakers too.
If you look at my control room pic again there is a pair of Tannoy SRM 12X monitors in the background, just above and behind the multicellular
horn. I love them lots.

[Arjank]

Originally Posted by Bassmec

That's a very serious monitor I love the imaging of coaxial speakers too.
If you look at my control room pic again there is a pair of Tannoy SRM 12X monitors in the background, just above and behind the multicellular
horn. I love them lots.

Thnx Bassmec, the goal for this cab was to make the best 210 possible, no coloration, low distortion and good dispertion. You can read it all here Building a superior 2x10 cab
I allready saw those tannoys in your picture, great man!
Great horn btw, you don't see those multicells anymore...pitty