Looking for a mid driver for a 3-way system.
So far the search came down to those 2 drivers.
Or maybe some can say which they prefer for which reason.
Mid will be crossed around 300 - 3K .
There isnt much between them I guess.
Visaton + : 8ohm, smaller, lighter
- : sensitivity = 85db. (woofer used is SB23NRXS45-8 88.5db)
SB acoustic + : sensitivity =90db
- : 1"bigger, 4ohm
I dont have any information about off-axis and distortion....
https://en.toutlehautparleur.com/parametres-thiele-and-small/
[Moderator edit: Removed malformed table]
So far the search came down to those 2 drivers.
Visaton B 80, 8 ohm or SB12MNRX2-25-4
Dont know if one have experience with both these drivers.Or maybe some can say which they prefer for which reason.
Mid will be crossed around 300 - 3K .
There isnt much between them I guess.
Visaton + : 8ohm, smaller, lighter
- : sensitivity = 85db. (woofer used is SB23NRXS45-8 88.5db)
SB acoustic + : sensitivity =90db
- : 1"bigger, 4ohm
I dont have any information about off-axis and distortion....
https://en.toutlehautparleur.com/parametres-thiele-and-small/
[Moderator edit: Removed malformed table]
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Hmm......(300*3000)^0.5 = ~948.68 Hz mean = ~34400/pi/948.68 = ~11.5422 cm effective diameter = ~11.5422^2*pi/4 = ~104.632 cm^2 (Sd), so what's available around this size or a little bigger?
Which bit of that maths above takes the mean frequency of 948hz decides that a piston of 11.5cm is the best....the 34400 bit.?
And is sd directly related to diameter or is the 'dish' of the cone a factor too.....surely a perfectly flat 11.5cm driver like a bmr may have sd=104cm2 but if we heavily dish that cone in towards the dust cap we have a greater sd?
And is sd directly related to diameter or is the 'dish' of the cone a factor too.....surely a perfectly flat 11.5cm driver like a bmr may have sd=104cm2 but if we heavily dish that cone in towards the dust cap we have a greater sd?
But as far as general choices for a 3 way mid....wow...big choice..
Dayron PS95, RS100
Seas MCA12 or 15
Scan 10f
Ubiquitous Vifa tc19
Faital 3fe or 4fe
Just ones that are on my radar.
I though the general thinking was a smaller mid is best, around the 3" mark
Dayron PS95, RS100
Seas MCA12 or 15
Scan 10f
Ubiquitous Vifa tc19
Faital 3fe or 4fe
Just ones that are on my radar.
I though the general thinking was a smaller mid is best, around the 3" mark
Having a mid with lower sensitivity then the wof is a big problem so that that should be avoided - if one is planning for a passive filter.
The design and properties of the back chamber for the mid will probably have more impact on the sound than the driver choice itself.
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The design and properties of the back chamber for the mid will probably have more impact on the sound than the driver choice itself.
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A pyramid perhaps? They discuss it here a lot (called a "dagger"). I seems good.
https://www.diyaudio.com/community/...t-waw-ref-monitor.273524/page-51#post-5328700
Its visible in the second pricture.
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https://www.diyaudio.com/community/...t-waw-ref-monitor.273524/page-51#post-5328700
Its visible in the second pricture.
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Yes the plastic 'sports cone ' like kids would dribble a football round is what is recommended in the above thread. About 1.2 litres and a good shape for standing waves.
those plastic ones? are they good material for speakerbuild. I came across this one. 8cm tall perfect for my speakerdept. Dont know if the magnet fit into them.
https://www.bol.com/be/nl/p/mini-co...w.2_17.19.ProductImage#product_specifications
I suppose stiff would be better? A version made out of 4 pcs of mdf is better as there are no equal distances in such a construction. But this is easy and probably 95% OK 🙂
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It isn't necessarily. By for example a 2nd order crossover the tweeter and woofer normally adds a fair amount to the output at frequencies primarily handled by the mid. This is an example
The summed response:
(the 50 Hz in the tweeter response is my mic preamp - huge rookie mistake in power supply design)
By high order crossovers the mid needs higher sensitivity. So there you may have a point.
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If you have the SB12 in mind, consider the woofer with foam surround instead of the mid. The foam version is very responsive in the midrange, whereas the mid version has a high loss rubber surround as far as I recall. If you wan't to cross it low you'll also have the extra stroke from the woofer, in case you'll have a party.
I've used the foam version in these. Highly recommended.
Look like a very interesting design. All SB drivers?
the foam version has higher Qms &Qts (good), higher mass (bad), higher voice coil inductance (bad) then the MID version. I don't know what parameters have more influence/importance for a mid....
I had same in my SIMs, using low order filters. Even had to bring the SB12 MID down a bit.
Your focussing too much on numbers. A high loss suspension is bad for midrange. Think about it, you have great speakers designed with far higher Mms than the SB12 woofer with foam....
The pioneers originally worked out driver sizes by acoustic power balance, i.e. power load sharing for highest SQ over the widest BW, so a good plan regardless of average power used.