Inspired by a friend and his new OB, I finally decided to take the plunge on the endgame design (for me). A few years ago I was trying to figure out how to make a stable 3-way with a larger woofer and there was always something wrong...
A friend of mine has already created beautiful 4-way OB based on BlieSMa beryllium domes. I want to use slightly cheaper versions of the BlieSMa midrange dome - TeXtreme version. The whole thing is to be controlled from miniDSP Flex Eight and actively powered. Of course, someone familiar with the subject will come to help with tuning.
I'm getting ready to assemble a set of speakers and today it looks like this (almost TeXtreme team):
Bass: SB SB42FHCL75-6 - interesting loudspeaker with a stiff diaphragm - it can be extended to around 300 Hz (planned closed housing and cut around 150 Hz)
Low-mid: Satori MW19TX-8 7.5" version with TeXtreme diaphragm. (planned division 150Hz to approx. 600Hz)
Diameter: BlieSMa M74T-6 version with TeXtreme diaphragm (planned division 600Hz to approx. 3500Hz)
High: SATORI TW29TXN-B-8 version with TeXtreme diaphragm (planned division from approx. 3500Hz)
I wonder if, for highs, e.g. BlieSMa T25B-6 (Beryl) would be better? I think the 34mm BlieSMa T34B-4 would be an unnecessarily large dome (when used with a midrange dome)? It seems to me that the low-mid Satori MW19TX-8 7.5" would be a good choice. I considered the 6.5" version but it seemed too small. Maybe it's worth considering a different speaker?
A friend of mine has already created beautiful 4-way OB based on BlieSMa beryllium domes. I want to use slightly cheaper versions of the BlieSMa midrange dome - TeXtreme version. The whole thing is to be controlled from miniDSP Flex Eight and actively powered. Of course, someone familiar with the subject will come to help with tuning.
I'm getting ready to assemble a set of speakers and today it looks like this (almost TeXtreme team):
Bass: SB SB42FHCL75-6 - interesting loudspeaker with a stiff diaphragm - it can be extended to around 300 Hz (planned closed housing and cut around 150 Hz)
Low-mid: Satori MW19TX-8 7.5" version with TeXtreme diaphragm. (planned division 150Hz to approx. 600Hz)
Diameter: BlieSMa M74T-6 version with TeXtreme diaphragm (planned division 600Hz to approx. 3500Hz)
High: SATORI TW29TXN-B-8 version with TeXtreme diaphragm (planned division from approx. 3500Hz)
I wonder if, for highs, e.g. BlieSMa T25B-6 (Beryl) would be better? I think the 34mm BlieSMa T34B-4 would be an unnecessarily large dome (when used with a midrange dome)? It seems to me that the low-mid Satori MW19TX-8 7.5" would be a good choice. I considered the 6.5" version but it seemed too small. Maybe it's worth considering a different speaker?
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For ultimate setup i would probably change woofers to TD12M and TD18h+; but in Europe they are $$$. Tweeter is a matter of taste, and You could even consider cheap Dayton AMT.
Why TD12M not TD10M? 18" woofer is a bit too big 🙂 I brought it home SB Audience BIANCO-18SW450 and it was monstrum 🙂
Midrange and tweeter are in their own sealed cavity, so the open baffle concept goes out the window.
The so called wide sound stage with narrow instrument identity or whatever stuff people make up these days.
Is heard within the mids and highs of a open baffle.
Fighting the dipole cancellation to be expected in the bass region will be just that.
Doesn't add much to the illusion of what people like about open baffle.
The driver selection is high budget, so likely be rather impressive if done well as normal 4 way.
Detail yes from a metal dome is rather amazing. And yes a smaller tweeter can be used.
Depending on how large the mounting ring is of the tweeter, the center to center distances can be beneficial.
If to large regardless most the benefits are lost, aside from the sound quality of the tweeter itself.
The so called wide sound stage with narrow instrument identity or whatever stuff people make up these days.
Is heard within the mids and highs of a open baffle.
Fighting the dipole cancellation to be expected in the bass region will be just that.
Doesn't add much to the illusion of what people like about open baffle.
The driver selection is high budget, so likely be rather impressive if done well as normal 4 way.
Detail yes from a metal dome is rather amazing. And yes a smaller tweeter can be used.
Depending on how large the mounting ring is of the tweeter, the center to center distances can be beneficial.
If to large regardless most the benefits are lost, aside from the sound quality of the tweeter itself.
Very good idea for bass reproduction solves that problem.
Midrange is what creates the illusion that people like.
So anything from 450 Hz on up to standard tweeter crossover at 1.5k , 3k , 5k
Should ideally be the open drivers.
3k and higher can be further emphasized also using planer / amt
As mentioned a dome mid is very good idea for sound reproduction.
Far as the illusion of open baffle. It is closing off those frequencies from the closed rear chamber.
Standard open cone drivers to AMT or planar is what is useful for most the bandwidth that creates
the open baffle sound
Midrange is what creates the illusion that people like.
So anything from 450 Hz on up to standard tweeter crossover at 1.5k , 3k , 5k
Should ideally be the open drivers.
3k and higher can be further emphasized also using planer / amt
As mentioned a dome mid is very good idea for sound reproduction.
Far as the illusion of open baffle. It is closing off those frequencies from the closed rear chamber.
Standard open cone drivers to AMT or planar is what is useful for most the bandwidth that creates
the open baffle sound
Depends what You want to achieve. TD12M seems way more capable then TD10M. I tend to think that sensitivity describes in a way how dynamic and potent speaker is, and 12M is better in this regard. You'll also pump it harder than You think as it plays in the most demanding region of BS, and before room gain for bass. In a way midwoofer in this region needs to be 6dB more potent to reach level of the rest of transducers.
