BTS 15 alternatives
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i had a question has anyone treid to make a smaller BTS 15 for desktop use? or would that not really be smart to do. cuz i love the design of it but i dont have any space for them and the speaker i really wanna build doesnt have the plans online anymore which i still havent heard any info on if there gonna be able to be bought again anytime soon
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Desktop, you say.
Question: what’s the basic size for the speaker box? That will set the max size of the driver(s) you could use.
You could then go for a 2 way with a rounded horn, since you will be going near-field. Hmmm, maybe a 2.1 system, since desktops are usually a bit weak, unless you throw some decent power at them.
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should be about 40cm tall 30-40cm wide (i would need to move some stuff on my desk for 40 tho) and 20cm deep
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That gives us a box of somewhere between 0.7 – 0.85 CuFt or 19.8 – 24 L, using a 1/2″ or ~12mm plywood.
Take a look through the woofers / mid bass / full range drivers to see what would fit / work within those parameters. If you are really miniaturizing the BTS 15, make it a ported box. Once you find a suitable bottom end driver, we can look for some sort of horn type driver that will work for a 2-way speaker.
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ill try to but id geuss an 8 inch or 10 inch should fit right? ill have a look
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https://www.soundimports.eu/nl/sb-acoustics-sb20frpc30-8.html
https://www.soundimports.eu/nl/sb-acoustics-sb20pfcr30-8.html
these seem good to me but im not really good at choosing this type of stuff but i wanna try to make it not too exspensive -
i also still need to figure out if i want a center channel and so yes what would be good so maybe we could try something out for that too
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linked some below but like i said i dont really know what i should look for…
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That’s a nice driver, but the optimum box size for it in a bass reflex (ported) design is over 2 cu.ft. or 56.5L I think you’ll need to find something with a smaller Vas and Qts, somewhere close to 0.4 or so.
So, maybe 1/3 to 1/4 the Vas of the SB20, with a decent Fs and a SPL at least in the upper 80’s would be nice, but not necessary if it had a good BL and can take some power.
Have you used WinISD? It’s free, and Nick (Toid) has a couple tutorials to get you going. Most important, for starters, is the one where he teaches you how to put in the driver parameters so it works every time. I use it when I want to confirm or refine my ideas.
So what it boils down to is that you need to find a driver to work with your box constraints, while delivering “the goods”. I think a smaller driver will work better, maybe a 5-1/4″ up to a 6-1/2″ max. (135 – 165 mm)
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alright i did just download winISD just to be sure but ill look for some smaller drivers then
https://www.soundimports.eu/nl/markaudio-chbw-70.html
https://www.soundimports.eu/nl/markaudio-chn-110.html
these should fit most likely
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you should be able to fit two chn 110 in the box as it fits in a 27L box. is that suggested? I would love to have two woofers and then one horn on the top.
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Referring back to the box sizes determined above: “That gives us a box of somewhere between 0.7 – 0.85 CuFt or 19.8 – 24 L, using a 1/2″ or ~12mm plywood”, I’ve run the “70” and the “110” through some scenarios. Read on.
You could fit a pair of the “70’s” in the smaller box, but not really have enough room for a horn tweeter up top – if you were lucky, maybe 14.5 cm. And that is if all drivers are touching. You “might” find a horn skinny enough to fit. The box would be tuned to 52 Hz with an F3 of 45 Hz. a 3.8 cm round port 3.6 cm long would work – pending design review in WinISD.
**note – I looked on the horn tweeter page of Sound Imports, and there are number of round and square ones that would fit and still leave a bit of room top and bottom. But it’d still be pretty tight.The “110” in a single driver + Horn tweeter in the 24L box will tune to 44 Hz. The same 3.8 cm port would be slightly longer – 4.3 cm long. This driver is slightly more sensitive then both of the 70’s put together, and tunes a bit lower. Again, WinISD to check.
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im fine with having the from part bigger so i can fit a horn should not be an issue
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liek i said adding some height to it so i can fit a horn
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Sorry, I’ve been in the hospital for knee revision surgery. Plus all the spam that’s been hitting this forum and others I am involved has been taking up time. I’m hoping to get home tomorrow, but we’ll see.
Basically, if you have 2 of the same bass drivers on the baffle, side by side-ish ( not face to face like the ISO 100 ), you double the Vas which makes the box twice as large for the same result other than a change in dB output. That means that for the 110’s, you’d need a 48 L box. I’ll let you figure out how big they’d be on the desk.
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ah fair so one 110 and then there should be enough space for the horn then also the bts 15 design had the ports/holes at the bottom. would you perhaps know if thats needed/ possible in this version? Just respond when you can.
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I believe there would be enough room to make up a single or double port on the bottom, even if it were more to the sides of the 110. You could even do a single slot port at the bottom or 2 triangular ports on the corners. You’d just have to run the simulation in WinISD to make sure the port is big enough to prevent noise and then tailor it from there.
That’s the fun of designing a custom fit unit, you can make it pretty much just about anything you want , even if it’s based on another design. Your options are limited only to your imagination and physics.
😉
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this is what i get when i have two vents of 10cm in diamiter and a box of 24 liter tuned to 20hz
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btw i cant seem to find info about focal drivers and i cant figure out which are full range
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that doesnt seem right
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seems fine right? else ill just use the ones i was using before
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i might also make another thread for making a center channel based of a focal utopia center channel and maybe those big utopias cuz id love to have more then 2 speakers at my setup.
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I’ll have give them a quick run when I get home, hopefully tomorrow or Tuesday.
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alright but ill make a thread for the focal speakers rn cuz i dont wanna clog this up with that
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any update?
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Not yet. Of course, as soon as I get back home, there’s a mad rush of stuff that needs my attention at work (thank goodness I can work from home) plus keeping on track with healing from the surgery. I promise to look at it closer in the next few days. Just wanted you to know I haven’t forgotten.
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alright ill wait i got exams to focus on anyways XD
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So, I’ve found the T/S sheets for the drivers and put them in WinISD. I like the CHN110 best in a 28.1 L box. It will handle it’s rated power at or just a hair above XMAX and has the smoothest response, as well as the best response. Says it’s tuned to 42.4 Hz, but I believe its a touch higher, F3 of 40 Hz, and a F10 of 31.6 Hz. Using a 7.6 cm port, 21.4 cm long keeps you at a max of 18 M/S. Perfect.
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ah so i should get the chn110 will do but the focal ones could be nice to maybe use for the focal utopia copies
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Oh, I haven’t even gotten to the Utopias yet. Other than to see they are 2- 8″ woofers, a 6-1/2″ mid, and a beryllium tweeter. Plus an overall height, which I have to figure out what one listed is without the stand.
Its not easy sitting at this computer for long stretches of time with a healing leg. I am looking into it, but work comes first. I will get to this on that thread.
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yea i get it XD its better for you to be healing then to be doing something that could hurt you
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This is using the CHN110 as a single driver. Box, Port, Cone Excursion/filter, and Power.
This, in my opinion, is one hell of a driver. Now all you need is the horn to go with it. and it’s quite loud at 45 Watts (105 dB). Even the -10 dB (95dB) is down at 35 Hz. Nice!
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ill look for some horns but if i cant find any that fit the bill i could also 3d print one
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https://www.soundimports.eu/nl/dayton-audio-h812.html?_gl=1*k1iq07*_up*MQ..&gclid=Cj0KCQiA88a5BhDPARIsAFj595hH5akW2tP1hbhP6onzP4xushQQFxs0yf4LzEyWHr2WxD5Ft0yLq0UaAlv-EALw_wcB this one seems nice and then i would need a compression driver aswell correct?
theres also horns with ribbon tweeters but i dont know about how good they would be for this those might even be better for the utopias
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The lovely thing about horns, especially the flange style you show here, is that they “can” accept regular tweeters that have up to the throat diameter. That doesn’t mean they’ll work well, but it doesn’t mean they’ll be horrible either.
Watch: https://youtu.be/yC_HTPYiMTU?si=TJDeNJ4Q2j7bq-qd
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Looks like the Monacor DT-25N Dome Tweeter would work, and might even bolt right up. I had to go elsewhere to get a graph. Soundlabs Group has one.
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Here you go. I’ll let you design your box. For a starting point, check out my Useful Conversions post.
Listings from Sound Imports with VAT included.MarkAudio CHN110 €59.95
Monacor DT25N €39.95
R1 12.5 ohm Resistor €6.95
C1 5.1uF Dayton Audio Poly Cap €2.95
C2 1 uF Audyn MKTA Poly Cap €1.49
C3 10 uF Audyn MKTA Poly Cap €5.65
C5 330uF Mundorf Electrolytic Cap €6.95
L1 0.65 mH Jantzen coil €6.85
L2 47 mH Jantzen coil €18.45
L3 1.2 mH Jantzen coil €6.85
**Note – there is NO C4Total per speaker, not including terminals or wood, €156.04
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thx man! ill try to make something some time but school goes first rn
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I haven’t forgotten you. I’ve been busy and am going in for the 2nd half of my knee revision in a couple of days. Once back home, I will hop back in. This one should be a fairly quick box to come up with.
BTW, all the values in the crossover are the actual values available on the website. No need to worry you can’t get anything.
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will try to make something some time thx
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I’ve got a box with slot port penciled out. I just need to transfer that into some sort of drawing program with dimensions. Should be a banger when done.
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tbh if you have some measurements of that i could maybe build my own ones as i do still have wood to build em tho i would have to figure out how in gods name i will mount em XD
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ive also seen these insane looking speakers named Tekton Design Encore that might be worth making a smol boi of but maybe i should try something myself sometime instead of always hoping others have the knowledge XD
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As much as it would be interesting to try to figure out a design like that, the hub-bub that the designer / owner started last year over reviewers having even the tiniest criticism over his products, I wouldn’t even consider it. If he’s going to be that way, I want nothing of him or his products.
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yea thats kinda why XD i want something like that some day but i def dont want to buy it from that duchebag
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Let me get that design at least cleaned up and scanned in. Too many scratchy numbers all over the place trying to figure out the port and size / placements of everything.
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once you do that i might build em and then have my lil klipsch r40m as secondarys just above my monitor
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any update?
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Scans coming tomorrow.
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just in time for my avr to come in XD
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Here is what I put together. Hope it all comes together and they do you well for years to come.
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Thank you 😀 ill prob build them for rears or as second surround as i got a 7.2 surround system now
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👍
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with how thin and small they are i might accually be able to build like 3 or 4 of these with the wood i have but i might use that to build a center as i still want one
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Still working on these. – got a crossover done, I believe.
Done. See thread up above. -
bump
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