Boundary control BC subwoofer BC218/2 Design

Build is completed

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Testing with 18SW115 drivers for now, those things are brutal, go to 30hz with real authority, modulate voice, you name it 🙂

Subjectively quite a bit more output than 4 tapped horns (similar to Xoc1 th18).

Directivity is excellent also, a lot better than i expected, paired with synergy horns this setup offers excellent rear rejection, bass is almost non-existent behind.

Will make some measurements in following days, it depends on weather
 
Testing with 18SW115 drivers for now, those things are brutal, go to 30hz with real authority, modulate voice, you name it 🙂
Wow!!!
Congratulations Amigo!
The build looks fantastic and very symmetrical!!

What's the configuration possible with those cabs, just the big eye?
Or you can put a pair with the ground plane as half eye? 👁️

I will call your build "Big Eye" 😎
 
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Yes, this design actually offers more possible configurations than original design, there is eye, half eye pointing down, standard flh stack and even half eye config consisting of 2 cabs horizontal for not high enough stages (2 cabs are then 3x0.75m in dimension)

Ofcourse listening test are possible, I am located near Brežice in Slovenia @noname7, tell me when are you free and we could test them a bit more, for now fitted with 18sw115, waiting for 18ipals, pressure sensor hole was blocked for now for obvoius reasons.
 
true, having 4 individual boxes instead of 2 doesn’t just make it easier to transport, it also gives more stacking options! Really like what you did here and thanks for the invite.
I’m not too far away, but snowed in at the moment, let’s make it happen when the weather is better 😉
 
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Here are response graphs, really close to original I think

No EQ, only crossovers BW24@22hz and LR24@80hz
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Corrected response, same filters:
1736083562949.png

Flat 28hz, -3db is at approx 25-26hz, -10db at about 22-23hz. In corrected response only high shelf is applied to upper frequency reduction and gentle 40hz bell boost, Measured at about 5m distance from 4 cabinets in eye configuration.

Directivity is excellent and VERY noticeable, I expect at least 10-15db reduction, will measure it when weather gets better
 

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Yes 18sw115 is an amaizing driver, very usable in almost every box design.

The thing I like about those cabs is their "quick response" with normal program they do not sound "overly deep" like most BR cabs do IMO. They sound quite neutral and sound smaller than their size if that makes sense. Ofcourse that could be changed with DSP to suit preferences

But when songs with good low frequency content below about 35hz are played, the difference is massive and they really turn into beasts, every note is deep and effortless while still maintaining tight kick.

One "downside" is that bass seems quiter than it actually is, you can turn them much higher compared to tops and nothing will sound boomy. That can be a good thing or bad thing, depending or preferences

My favourite subs till this day for sure, was never really really happy with tapped horn sound quality (love output tho) but those cabs are really on another level. To simply put they can sound however I like and how i tune them. Can't wait too see how IPALs open even more possibilities. Hope boxes survive them 🙂

@noname7 , yes there is plan for more testing, probably this weekend

But for sure this design is working and I am already having something like 2x15" on my mind that goes to about 33-35hz -3db
 
Yes, It is possible. Each box has 6 M10 threads on one side that you could use to ''connect'' 2 boxes together using some additional hardware. Even if using in eye configuration it should be beneficial since it would cancel out movement of drivers. When pushed really hard boxes like to ''jump'' a bit when used in singles.
 
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