Ok, might as well start a topic. 😎
I'm playing with some recipes here to get the maximum performance (in-room SPL) and quality (9½-10 octaves bandwith)... with a very limited footprint, base included. The kind of thing you can almost push against the wall and it won't annoy anybody because of his size.
For starters, here is my 1st attempt:
F.A.S.T. sealed box + OB
JL audio 8W1v3 + Airborne FR151
Final version will have massive steel base that will have the same width as the bamboo enclosure (+/-224mm), flush on the front and maybe only 2-3cm on the back for better balance. Ultra low center of gravity to keep the whole thing stable.
For the pair, i'm looking for less than 0,9 ft² (0.09m²) of footprint.
I'm playing with some recipes here to get the maximum performance (in-room SPL) and quality (9½-10 octaves bandwith)... with a very limited footprint, base included. The kind of thing you can almost push against the wall and it won't annoy anybody because of his size.
For starters, here is my 1st attempt:
F.A.S.T. sealed box + OB
JL audio 8W1v3 + Airborne FR151
An externally hosted image should be here but it was not working when we last tested it.
Final version will have massive steel base that will have the same width as the bamboo enclosure (+/-224mm), flush on the front and maybe only 2-3cm on the back for better balance. Ultra low center of gravity to keep the whole thing stable.
For the pair, i'm looking for less than 0,9 ft² (0.09m²) of footprint.
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The 8W1v3 requires 8-10 liters only in a sealed box. The one shown in the picture is about 13 liters, for the sake of testing.
So far, so good. Non-EQ, it makes a solid 30-35hz which is lower than the Fs. Only powered by a ICE 125asx2 on 1 channel (so 125w), already have some good in-room SPL and the driver seems to be able to take much more than that.
Tomorrow, i will EQ the whole thing and see how it goes. I expect to have something decent starting from 25-27hz.
Next: i'll copy the concept but using a 10W1v3 this time... Fs of 25hz and only 15.5 liters requirement! Footprint for a pair would probably be less than 1.3 ft², which is still very good.
So far, so good. Non-EQ, it makes a solid 30-35hz which is lower than the Fs. Only powered by a ICE 125asx2 on 1 channel (so 125w), already have some good in-room SPL and the driver seems to be able to take much more than that.
Tomorrow, i will EQ the whole thing and see how it goes. I expect to have something decent starting from 25-27hz.
Next: i'll copy the concept but using a 10W1v3 this time... Fs of 25hz and only 15.5 liters requirement! Footprint for a pair would probably be less than 1.3 ft², which is still very good.
This one has EL70 in it (NLA). Alpair 10.3 fit in the same box. Althou not optimum Alpair 10p and FF165wk also fit. 395 cm^2 (.0395 m^2/61 in^2/0.425 ft^2) without the optional base.
dave
Unless the highpass on the OB section is high enough 🙂
I'm not planning to strictly use this 8W1 in the ''subwoofer range'', i'll push it north of 200hz.
Minimum foot print, backed up pretty close to the wall... I can do that...
that sure is tall! 😉
you know the space it takes on the floor, wesayso ?
your logic is flawed in every sense...you want to have direct and reflected sound separated by significant amount of time, tens of milliseconds, for brain to clearly distinguish these two, one as direct, the other as room reflection, no matter what frequency, these two have to be separated by significant amount of time
(lots of books about this)
for majority of frequencies
only placing ob far enough can achieve that
according to your logic, if you cross dipole tweeter high enough, you can place is close to the wall...what flawed thinking, total fail
While the enclosure itself still fits on an A4 size paper, the feet are a bit bigger to provide balance to these columns. They are ~31 cm wide by ~39 cm deep, though the back of the feet is less wide to get it closer to the chimney you can see on the right.
(one of the benefits of DIY where we get to tailor it to our room or needs)
The enclosure itself is 220,5 cm tall and the feet add another ~6 cm to that.
The enclosure can rotate a full 360 degrees within the feet to provide all the adjustability I'd ever want with toe in/out.
Thanks for your input Adason. You make it sounds like something gonna explode, though 😉
I can assure you: there IS sound coming from them, positionned as seen on the pictures.
Nothing odd so far. Sure it's better 3-5ft from the wall, like many speakers (OB or not) but nothing odd to my ears.
Will sure get the RTA on it, i want to make sure i'm not getting some cancellation. Anyway, that's not against the wall per se since it's physically impossible (depth of the enclosure + baseboard)
You are missing the point, it's not so much about cancellation it's about the time delay between the direct and reflected sound and the way the brain interprets them as adason says. If you are serious about getting the best out of OB you should immerse yourself in Linkwitz Lab
I have serious questionning (doubt) on two things:
1. Time delay being tens of ms, i'd say rather less than 15-20ms.
2. Deterioration (of sound quality and/or performance) and audibility to the ears -in any given normal listening session- of said time delay.
Got exactly 233mm from the wall to the front of the baffle right now. Listening at moderate volume and, again, nothing odd. My brain interprets the sounds coming from the driver as...music. Really nice sounding music, i must say.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
... and on top of that, if any serious (audible) problems occur, you can put some acoustic treatment on the wall, various density foam to cover a wide bandwith (if needed)...
I seriously fail at one thing: to see how this is a deal-breaker of a problem.
I seriously fail at one thing: to see how this is a deal-breaker of a problem.
More interested in your Wall shelf (?) things. Their curved design intrigues.
Headphones (if you can live with them ) have Far less footprint than any speaker 😉
Headphones (if you can live with them ) have Far less footprint than any speaker 😉
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