I have read now and then some people like very limited directivity speakers. There have been some discussion to avoid diffraction also. I have tought many kind of three way speaker lately. I figured out following requirements:
Low directivity (at least horizontal)
Narrow baffle
500-4000 Hz mid (or something like that)
Cone tweeter
Not low Qms woofer(s)
Some toughts to avoid diffaction
Not expensive
No need to high volume
Something behind project is idea about short full range line top with separate bass box. (like PA-speakers), Why not put them in the same box. To reach down to 500 Hz with minimizing distortion I use two drivers. Full ranges are too directive at tweeter frequencies. I tought to avoid it using separate tweeter.
My plan is to try pair of FaitalPRO 3FE25 as mid and Monacor HT-22/8 or SPP-90-8 tweeter. Bass could be SB racetrack.
Low directivity (at least horizontal)
Narrow baffle
500-4000 Hz mid (or something like that)
Cone tweeter
Not low Qms woofer(s)
Some toughts to avoid diffaction
Not expensive
No need to high volume
Something behind project is idea about short full range line top with separate bass box. (like PA-speakers), Why not put them in the same box. To reach down to 500 Hz with minimizing distortion I use two drivers. Full ranges are too directive at tweeter frequencies. I tought to avoid it using separate tweeter.
My plan is to try pair of FaitalPRO 3FE25 as mid and Monacor HT-22/8 or SPP-90-8 tweeter. Bass could be SB racetrack.
Hi, nice! do you mean low Directivity Index = wide pattern? Direct radiating drivers usually deliver this. Pattern is very wide and narrows some due to baffle width and then some more on the high treble where wavelenght is relatively small to the tweeter.
While 2" cone tweeter is smaller than the 3fe25 I think you could do a side by side comparison with and without the tweeter to figure out if it is needed, if you can put time on the process and do such comparison. You might notice the top end be similar (dispersionwise) in which case smaller tweeter or no tweeter could work better. Going without tweeter would simplify the system a lot.
I'm speculating, I never had or heard such speaker 🙂 Have fun!
While 2" cone tweeter is smaller than the 3fe25 I think you could do a side by side comparison with and without the tweeter to figure out if it is needed, if you can put time on the process and do such comparison. You might notice the top end be similar (dispersionwise) in which case smaller tweeter or no tweeter could work better. Going without tweeter would simplify the system a lot.
I'm speculating, I never had or heard such speaker 🙂 Have fun!
Yes, wide pattern. Tweeter would be at 79 cm height, midranges above it. This part is rounded edges (sides and top). 9 cm straight baffle and total width 16cm. So radius of roundings is 3,5 cm.
In my opinion full range speakers are bad idea. I think at least principled reasons demand tweeter. 🙂
In my opinion full range speakers are bad idea. I think at least principled reasons demand tweeter. 🙂
Yes, besides possible electro-mechanical reasons multiway makes sense by having similar sound to various directions. By choosing smallest possible tweeter you can push the frequency up, where narrowing of the pattern happens. 2" will beam below 10kHz, 1" would beam octave higher, 0.5" one octave higher still.
Between ~3" and ~2" there is not too much difference in this regard, where the beaming starts.Both would result quite narrow at 20kHz. None of this perhaps matters, or it is just the difference you are looking for?
Thinking with the dispersion in mind: to me it would make most sense to use smallest tweeter that sounds good, to keep the pattern wide to as high frequency as possible if crossover can be so high that practically any tweeter works, like >3kHz. Patternwise, 1" or smaller tweeter hould have more meaningful extension to a 3" fullrange driver than 2" has.
Of course you are free to use the 2" cone tweeter, especially if you like how it sounds! I'd try and make protype of the mid-high box and when it sounds nice go on to make a complete system with the bass box and all. Have fun!
Between ~3" and ~2" there is not too much difference in this regard, where the beaming starts.Both would result quite narrow at 20kHz. None of this perhaps matters, or it is just the difference you are looking for?
Thinking with the dispersion in mind: to me it would make most sense to use smallest tweeter that sounds good, to keep the pattern wide to as high frequency as possible if crossover can be so high that practically any tweeter works, like >3kHz. Patternwise, 1" or smaller tweeter hould have more meaningful extension to a 3" fullrange driver than 2" has.
Of course you are free to use the 2" cone tweeter, especially if you like how it sounds! I'd try and make protype of the mid-high box and when it sounds nice go on to make a complete system with the bass box and all. Have fun!
I am prepared to make experiments with foam and felt to adjust tweeter directivity. Mid-high protobox is almost ready.
Last edited:
