4 Way loudspeaker project 15'', 12", 2" Comp., Tweeter
My new project is building a 4 way passive crossover loudspeaker stereo system.
The drivers are :
- BEYMA 15" 15LW30 Neodym
- BEYMA 12" 12LW30/N, same serie than de 15"
- 2" Compression driver + Horn (unknown for instance)
- Super tweeter
Fc will be 150 Hz, 900 Hz and 10000 Hz.
My new project is building a 4 way passive crossover loudspeaker stereo system.
The drivers are :
- BEYMA 15" 15LW30 Neodym
- BEYMA 12" 12LW30/N, same serie than de 15"
- 2" Compression driver + Horn (unknown for instance)
- Super tweeter
Fc will be 150 Hz, 900 Hz and 10000 Hz.
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A 4-way is pretty much what's needed, so, you're on the right track. I would advise against using a 12" for the upper bass, though. If you can reduce that to an 8" or 6", that'd be better. Then, you can move the 900 HZ x-over up past the range of musical instrument fundamentals. Say, maybe 1600-1800 Hz. This will also relieve the compression driver from having to deal with larger excursions. Move the tweeter down to 7000 Hz or so.
Then, you'll have a VERY nice speaker design, although I don't know anything about those drivers.
Then, you'll have a VERY nice speaker design, although I don't know anything about those drivers.
Hi, have you considered how the different ways horizontal patterns match? 12" has pretty narrow dispersion at 1500Hz. Also, 1" driver instead of 2" is fine at 1500Hz. With 2" throat driver one could cross much lower. Benefit would be to produce almost all of the human voice band with single driver. With 12" driver one would want to cross closer to 1khz where dispersion meets your horn dispersion.
I would try to get the middleband for one driver, or alternatively do 2 way + sub + super tweeter. 2 way would be 15" and a 1.4" driver in a waveguide with xover somewhere around 700Hz. Much like Earl geddes system 😉 still, next thing I'm gonna build is multiple entry horn though. Have fun! 🙂
I would try to get the middleband for one driver, or alternatively do 2 way + sub + super tweeter. 2 way would be 15" and a 1.4" driver in a waveguide with xover somewhere around 700Hz. Much like Earl geddes system 😉 still, next thing I'm gonna build is multiple entry horn though. Have fun! 🙂
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Serious question: why?
In my experience, the only time a 4-way system makes any kind of sense is for large-format PA systems. The only reason for increasing the number of crossover points is to improve power handling, and you can do this: PA system check at Batley Rugby Stadium - YouTube
With a 3-way system.
Which is more than loud enough for any domestic space.
So, why bother with the complexity of a 4-way system, when a 2- or 3-way system will easily do the job for a domestic environment?
Chris
I have a 4 way all horn system in my basement. And a fullrange (or two way KEF) + active sub in my work room. The point of the work room system is to enjoy music at sane volumes, the point of the other one is the same, but at insane volumes🙂
Edit: It all depends on the space you have. If well done, two way with a compression driver on a large horn + sub is IMHO the best compromise overall.
Edit: It all depends on the space you have. If well done, two way with a compression driver on a large horn + sub is IMHO the best compromise overall.
Ah Ah ! Speakerbuilding is a magic wold, many options are available.
What is the best charge for my 12"? Closed box or Bass-reflex?
The BEYMA 15" and the 12" come from for the same range, I thing it' s good for a homogeneous sound restitution
What is the best charge for my 12"? Closed box or Bass-reflex?
The BEYMA 15" and the 12" come from for the same range, I thing it' s good for a homogeneous sound restitution
Yes might be that they share same motor (magnet/voicecoil)
even 10LW30 looks the same +/- 4.75mm xmax
May be my friend, I won' t buy PRO drivers every day... 😀
Who can reply about the enclosure type for my 12"?
When I look at the drivers the 12" is really a midrange regarding the 15".
A friend give me a pair of CIARE CT440 Tweeters for tests; Those tweeters are really beautiful, a friend will make 3mm carbon mounts.
Who can reply about the enclosure type for my 12"?
When I look at the drivers the 12" is really a midrange regarding the 15".
A friend give me a pair of CIARE CT440 Tweeters for tests; Those tweeters are really beautiful, a friend will make 3mm carbon mounts.
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As for the enclosure
One way to go is 22-23 liters, low 60's tuning. This will give a usable F3 in the mid 70's.
One way to go is 22-23 liters, low 60's tuning. This will give a usable F3 in the mid 70's.
Ditch the 12" and the random crossover points, get a 2" compression driver that covers 500Hz to 5k (like an Altec 290) on a big enough horn and have a (for some people) "better" speaker.
To understand what you are trying to achive: what are you trying to achive and why did you pick that crossover points before knowing all drivers?
To understand what you are trying to achive: what are you trying to achive and why did you pick that crossover points before knowing all drivers?
It does have more output near the low end, but if you look at the midrange the sensitivity is the same.
Ok, now I need to choose a set of 2" horns constant directivity 90° x 40° and 2 models look good: BC Speakers ME 75 and P Audio PH-4525
https://www.bcspeakers.com/media/W1siZiIsIjIwMTMvMDMvMTEvMTUvNTMvNTkvNjk4L2ZpbGUiXV0
http://www.paudiothailand.com/uploads/pdf/products/PH-4525.pdf
https://www.bcspeakers.com/media/W1siZiIsIjIwMTMvMDMvMTEvMTUvNTMvNTkvNjk4L2ZpbGUiXV0
http://www.paudiothailand.com/uploads/pdf/products/PH-4525.pdf
I will buy a set of 2" compression drivers, today I order two BC Speakers 2" Horns ME 75.
Those horns are made of aluminium, they are constant directivity 90°x40°.
Those horns are made of aluminium, they are constant directivity 90°x40°.
