Hi all,
I'm thinking of making a 2-way OB using parts from a very old buy order that never were used:
The initial plan on the day was to make a 3-way using Raal as tweeter (maybe for sale soon), but my hearing today is almost non existent on >9khz, and that's why I'm thinking of using only the Neo's from around 200/500hz and up.
I would be going active with a MiniDSP, so maybe EQ the rising response is not a problem, but I've read about Neo10 beaming on 5-6Khz and up.
Not pretending the ultimate system, but yes something with very good bass and mids (I'm not a bass head and my music preference is mostly vocal).
Open to read opinions. Thanks!
I'm thinking of making a 2-way OB using parts from a very old buy order that never were used:
- 2x Eminence Deltalite II 2515
- 4x BG Neo10
The initial plan on the day was to make a 3-way using Raal as tweeter (maybe for sale soon), but my hearing today is almost non existent on >9khz, and that's why I'm thinking of using only the Neo's from around 200/500hz and up.
I would be going active with a MiniDSP, so maybe EQ the rising response is not a problem, but I've read about Neo10 beaming on 5-6Khz and up.
Not pretending the ultimate system, but yes something with very good bass and mids (I'm not a bass head and my music preference is mostly vocal).
Open to read opinions. Thanks!
Your big issue is going to be directivity at the higher frequencies, in the range of 2-9K. The Neo 10 will beam very narrowly in both horizontal and vertical, It will make it difficult to get the balance right in anything other than a narrow window. You may be able to use absorption and blocking to widen the directivity, but you will give up a lot sensitivity in the process. Instead, you may want to use the less expensive Neo3, or now the GRS PT2522. Still a very good tweeter.
Neo 10 varies 30 db on-axis to 45deg. The notch filter you will need not help with the off-axis response.
Neo 10 varies 30 db on-axis to 45deg. The notch filter you will need not help with the off-axis response.
Tks @drewmc; Sorry, I can't quote you, I don't know why.
That was the answer I was afraid to hear.
Do baffle shape (height/width) affects the overall off-axis response in any way? Has someone experimented with this?
Edit: I mean, in this particular case, if baffle shape can potentially make on/off axis response be not too far appart.
That was the answer I was afraid to hear.
Do baffle shape (height/width) affects the overall off-axis response in any way? Has someone experimented with this?
Edit: I mean, in this particular case, if baffle shape can potentially make on/off axis response be not too far appart.
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I would try making some pads for the neo10 to narrow the radiating surface at higher frequencies. Like the Raal foam pads, but down the outside edges of the neo10. I'd start with some rigid acoustic felt.
Yes, offset on the baffle and overall shape will effect off axis response
But what you’re working with can’t be helped…….add a tweeter. It doesn’t have to be a planar……domes work too with reverse phase rear firing
Since you are DSP active I think you can certainly make a very nice OB with those drivers.
I would still add a tweeter, Xover with a gentle slope starting (2nd order, maybe even 1st order acoustic) around 3 to 5 KHz so the Neo 10 is still doing a good amount of work in the upper mids.
I would still add a tweeter, Xover with a gentle slope starting (2nd order, maybe even 1st order acoustic) around 3 to 5 KHz so the Neo 10 is still doing a good amount of work in the upper mids.
I haven't used Neo10, only Neo8 and Neo3 as dipole. The problem with Neo10 is it's width (radiating area and frame)
To get smooth directivity (to get even off-axis response) an OB (or dipole) speaker must use at leas 3 drivers and baffle shape that gets more narrow towards higher freq/drivers
Anyway since you have those drivers and dsp, first make simple and cheap test baffle, take measurements and modify baffle shape and see what happens and how it sounds. I you get annoying problems with sound, get a tweeter too and make it 3-way. And perhaps a sub...
Linkwitz and Kreskowsky as well as Finke went to narrow mid-treble baffles and 4-way designs for a good reason!
https://www.linkwitzlab.com/models.htm
https://musicanddesign.speakerdesign.net/NaO_Notediscus.html
http://www.dipolplus.de/thema4.html
To get smooth directivity (to get even off-axis response) an OB (or dipole) speaker must use at leas 3 drivers and baffle shape that gets more narrow towards higher freq/drivers
Anyway since you have those drivers and dsp, first make simple and cheap test baffle, take measurements and modify baffle shape and see what happens and how it sounds. I you get annoying problems with sound, get a tweeter too and make it 3-way. And perhaps a sub...
Linkwitz and Kreskowsky as well as Finke went to narrow mid-treble baffles and 4-way designs for a good reason!
https://www.linkwitzlab.com/models.htm
https://musicanddesign.speakerdesign.net/NaO_Notediscus.html
http://www.dipolplus.de/thema4.html
Try also covering the back of the Neo10 with absorber so it tends towards cardioid at higher frequencies.
Back to your original about baffle size and shape, it will not have a significant effect on beaming of frequencies between 2-9 kHz. You would need to reduce the radiating area at high frequencies using foam or felt as Studiotech recommended. This will reduce efficiency at high frequency considerably, and you will still need a notch filter, although probably less dB.
I would start with thin melamine foam, as this material has high absorbance at high frequency, and progress to felt or polyurethane foam if the melamine is not sufficient.
Thanks for suggestions.
I'm quite clear now that I'll need a tweeter on top of the 10's from maybe 5-6khz and up, but still I'll try adding some foam/felt before and see what happens.
This is not a project that will begin shortly (just collecting info by now), so it won't be real updates on construction in a while.
I'm quite clear now that I'll need a tweeter on top of the 10's from maybe 5-6khz and up, but still I'll try adding some foam/felt before and see what happens.
This is not a project that will begin shortly (just collecting info by now), so it won't be real updates on construction in a while.
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I have made other people's OB designs and the best ones were preceeded by well documented driver testing and a careful selection process, something I cannot do in this life. The 2 way OB I listen to now is about 91 spl and uses a modest 10" pro driver ( MCN 552981) and an equally modest Vifa. Probably the best I've made.
Well, my initial intention (something like 12 years ago) was exactly that, something like a clone of an existing 3-way OB design with 1x Deltalite 2515 + 2x BG Neo10 + 1x Raal 140-15D per side... but then life changed its plans and that project has stayed paralized forever. Now my hearing is far worse than before and I'm now more focused in enjoy midrange and vocals (using mostly headphones for serious listening), and less in upper treble that I can't hear anymore.
I'm just trying to put what I have to good use -if possible- while I wait for the right time to begin.
Well I am sold on near field listening with my OB's now. And I would move to headphones if I needed too.
These mini speakers look interesting for a small very near field set up;
https://www.parts-express.com/Tang-...eaker-Module-2-3-4-x-2-3-4-264-938?quantity=1
https://www.parts-express.com/Tang-...oofer-Module-6-7-8-x-2-3-4-264-940?quantity=1
TB advises to high pass the T2 full range at 80 Hz iirc. Think these might work without a box or baffle... Probably could listen in the wee hours without disturbing the household. The full range sounds like it does well on it's own too.
https://www.parts-express.com/Tang-...eaker-Module-2-3-4-x-2-3-4-264-938?quantity=1
https://www.parts-express.com/Tang-...oofer-Module-6-7-8-x-2-3-4-264-940?quantity=1
TB advises to high pass the T2 full range at 80 Hz iirc. Think these might work without a box or baffle... Probably could listen in the wee hours without disturbing the household. The full range sounds like it does well on it's own too.
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