It's quite impressive to see that simple enclosure being able to achieve both 20hz and 110db simultaneously.
But, it looks like a tapped horn reversed (inward-radiated), what's the science behind that?
Thanks guy!
Hoffman's Law...loud, low, small...pick 2. A negative flared TH (T-TQWT or T-TQWP) plays low in a small enclosure.
Yes, 90* = 90 degrees.
I know it's a BP6P. Why aren't both ports firing in the same direction?
I'm curious of such deep-digging subwoofers and thinking about a pair of these (cos it's already been simmed) for my large room of 4000 cubes. How much spent (building cost)? 🙂
I don't understand why they shouldn't be, some PARALLELS are off-axis (I've posted one found online on page 6) and some are on-axis (like my design), teach me, I'm a novice???
In their simplest form, a single fold TH can be made with 7 panels just like a BR enclosure. The enclosure will be tall, skinny, and have a small footprint. A double fold TH will be physically bigger than a BR of the same internal volume due to the horn path.
BR = enclosure and port.
TH = the port is the enclosure.
Note the difference in port exits in both BP6P's.
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'We' don't unless the needs of the app dictates it, then 'we' do whatever is necessary to make it fit. I merely agreed with BW and noted what distance summed best overall in case someone wanted to build it.
Well, IMNSHO your simple two chamber vented box is a poor choice for the B&C 12TBX100.
Well, you didn't indicate that you were, so not being a mind reader I just responded to what you asked for.
Take the air and squeeze it after it collected momentum in its wave pattern of oscillation groups of 3rds or 5ths (or.whatever) but pick whatever interval, theres a use ful pattern regardless and the area of which is always the pipe harmonics. You can mass load or constrict an are between those which helps break it down in the respect to a physics atvantage as a pumping action by using the other side of the drivers output phase simultaneously.
Its quite obvious an abbreviated version of this is expressed in the sim softwares math and by design. However, hints of more exist in the TH sim and a compound version of it that does not separate the exits or it fouls that connection in phase if it exists by thr lengths in the distance from pumps or behind them as an offset standpipe would to irrigation, electrical(?) etc..
GM has always had the idea since long before some of it was pointed out by a guy with a computer and an engineering degree. the effect still being teased out of length from either side to a converging point within is up into the longer pipe if a person was wanting to reference a fulcrum.
It you place landmark on that point, like size change and a old or a driver entry(?).. i dunno, but im not running out if ideas to use... i think its a curse 😀 i hope you heed the warning, lol! once bitten youre stuck chasing something and each time you get a little bit more of whatever kinda us hiding in all that.
Sounds kinda silly. But go look at the that outside of a speaker box and youll see things that pump, prime and/ or bounce an imaginery force of pressure phase that drives from a fulcrum. (It appears to be one third in one pipe with a closed end, or at the closed end. But if using the other side of the driver its now moved ir ‘offset’ to a place based on the result of them both in length. (middle of the long pipe) the long pipe isnt cut in half. and middle isnt its middle, its the mid point it shared with the other end(and pump). Do the math... and research a thermo acoustic engine.with a single pipe and a closed end from which it bounces pressure. I dunno if thats what youve been drawing, but thats all i can
say or all i do in my own stuff.
I currently have 3or 4 versions of that. None of them suck. Theyre all a good speaker
Vent it seems. So i just keep using, but also abusing it to try and find a better fulcrum;(?) if it exists..
Its quite obvious an abbreviated version of this is expressed in the sim softwares math and by design. However, hints of more exist in the TH sim and a compound version of it that does not separate the exits or it fouls that connection in phase if it exists by thr lengths in the distance from pumps or behind them as an offset standpipe would to irrigation, electrical(?) etc..
GM has always had the idea since long before some of it was pointed out by a guy with a computer and an engineering degree. the effect still being teased out of length from either side to a converging point within is up into the longer pipe if a person was wanting to reference a fulcrum.
It you place landmark on that point, like size change and a old or a driver entry(?).. i dunno, but im not running out if ideas to use... i think its a curse 😀 i hope you heed the warning, lol! once bitten youre stuck chasing something and each time you get a little bit more of whatever kinda us hiding in all that.
Sounds kinda silly. But go look at the that outside of a speaker box and youll see things that pump, prime and/ or bounce an imaginery force of pressure phase that drives from a fulcrum. (It appears to be one third in one pipe with a closed end, or at the closed end. But if using the other side of the driver its now moved ir ‘offset’ to a place based on the result of them both in length. (middle of the long pipe) the long pipe isnt cut in half. and middle isnt its middle, its the mid point it shared with the other end(and pump). Do the math... and research a thermo acoustic engine.with a single pipe and a closed end from which it bounces pressure. I dunno if thats what youve been drawing, but thats all i can
say or all i do in my own stuff.
I currently have 3or 4 versions of that. None of them suck. Theyre all a good speaker
Vent it seems. So i just keep using, but also abusing it to try and find a better fulcrum;(?) if it exists..
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Guys, was reading your replies, misconceptions all over, will reply in the evening (+5.30 GMT)... 😀
Yup, some audiophiles prefer QWR over HR in terms of musical bass reproduction (seems true).
BTW, if you've actually built this "T-TQWT" (love its awkward shape!), can I have a photo?
Sorry mate, it was a misreading, you wrote AREN'T but I read ARE (quite busy nowadays), so replying again, yes they ARE, look at the arrows...
Well, looking at those 2 pics you referred me to, coloured one is OFF-axis (one horizontal exit & one vertical exit), other one (Devastator) is ON-axis (all exits are horizontal), what am I missing...?
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Alright, if you were referring to the 90°s marked in the 1st pic, how about the 2nd pic then?
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Thanks for your great support... 🙂
I got those txt files, will install HR and check, but I still don't get what you're asking for, if it's about placement I have enough space (300 cubes approx.) to place it, thus enclosure volume doesn't matter (for me), just worrying about the quality. 😕
I'll tell you a reason (if you're implying 12TBX100 isn't for 6bp), I know B&C is generally a pa (pro) brand, which is why 12TBX100 plays really well at horn-loading, but I have no other choice, no specific home audio (hi-fi) brands available here, otherwise would be genuine car audio drivers, they can go below 25hz all by themselves (fs) but I'm not sure if they fit at home listening (I really don't know), you might ask me "why bothering on diy?, just go for a factory setup", of course we have showrooms, like takeaways, we buy them, how much is a 1000w 5.1 with amp/receiver (all-in-one system)?, just $150 (you know the story), tired of buying cheap-cheats.
However, if you're explicitly talking about my design, whether "simple" or not, a both-chambers-ported-to-outside enclosure is theoretically called a "PARALLEL" 6TH ORDER BANDPASS.
I'm being a fan of your writings, trying so hard to figure out what's really happend like in a "Fincher" movie...
My double fold T-TQWT.
