I have been throwing around the idea of building a BIB style subwoofer. For example, there is Scottmoose's
CSS TRIO12 design. While reading through the various BIB threads, I found this one, which has the driver
mounted facing into the enclosure. Please see the attached photo. Is there a reason to do ...or not do this?
CSS TRIO12 design. While reading through the various BIB threads, I found this one, which has the driver
mounted facing into the enclosure. Please see the attached photo. Is there a reason to do ...or not do this?
Attachments
No clue about their mids/HF sonics, though all else equal, I personally would opt for the 166 due to its stronger published motor as it's inherently better damped and also allows a bit more tuning flexibility.
Hmm, thought I posted some thoughts on theoretically optimum terminus/ceiling or floor spacings in this thread, but with my saved docs with links not being available to me for now, no way to quickly check what/where I posted it. IIRC, the rule-of-thumb way is to find the terminus effective radius, then multiply it x 0.613 to get the minimum distance. The more complex way is to calculate its rate of expansion to calculate a proper bend expansion. Done this way, corner loading may not be required.
Regardless, I recommend building it 'stock', but make the terminus with a minor recess such that you can drop in a flanged 'tophat' to both get it closer to the ceiling and mass load it a bit with this simple straight section if you feel the driver needs more loading on some music.
You may want to do it anyway as HornResp indicates it's a worthwhile tweak. I had planned to experiment/post results by now using TC's original 40-1354 BIB, but 'life' keeps getting in the way.
GM
Without taking the time to research it, I assume the driver is too deep to fit and since it's a 'sub' woofer app, the XO will roll it off long before it gets high up enough in frequency for the frame/motor to audibly affect its sonics.
The only real downsides AFAIK is having exposed wiring, so ideally need some shielding against contact, accidental or otherwise and of course it's hard to dust properly if you're not blessed with a very good home filtration system.
GM
So im thinking of building some of these for a commercial installation, 20ft x 60ft x 20ft.
would using these upside down work, probably wall mount them, or since its not critical listening put them up high in the corners?
would using these upside down work, probably wall mount them, or since its not critical listening put them up high in the corners?
Just brought back my BIB from basement storage...it has been a while! re-tuned and really enjoying! Fostex ff165k, external dimensions: 69"x16.25x8.625. I think I copied Scottmoose's BIB and built back then 🙂
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I added some stuffing below the driver to provide some more loading, helped to bring out the bass. These BIB's are good with the infrasonic bass.
I built these in 2006 🙂 for whatever reason I change my audio system. I have some 2a3 monoblocks in storage and not used in years; just using an lm3875 chip amp to power these.
I built these in 2006 🙂 for whatever reason I change my audio system. I have some 2a3 monoblocks in storage and not used in years; just using an lm3875 chip amp to power these.
Yeah, pipe horns need a bit of damping in the first ~2/5th of its path-length if used wide range.
These do < 20 Hz with any sort of power?! Must be a lot of room gain.
GM
These do < 20 Hz with any sort of power?! Must be a lot of room gain.
GM
An externally hosted image should be here but it was not working when we last tested it.
I had to try one this morning.
I need to work some with the stuffing.
J.
Try some stuffing on the bottom to absorb mids coming thru the top. I'd also recommend doubling up the front and back of the speaker so it doesn't resonate.
FOXYE,
Good bass means different things to different people! 🙂
The FE166en in the BiB works well. I built one last year. Please note, you will have to place BIBs near corners to bring out the bass. With corner placement bass is nice and powerfull. You will need to adjust the stuffing a bit to tune to your taste, so if the front panel has a removable part, it helps. You might also consider putting in phase plugs to improve the treble.
Good bass means different things to different people! 🙂
The FE166en in the BiB works well. I built one last year. Please note, you will have to place BIBs near corners to bring out the bass. With corner placement bass is nice and powerfull. You will need to adjust the stuffing a bit to tune to your taste, so if the front panel has a removable part, it helps. You might also consider putting in phase plugs to improve the treble.
What is the gray wadding you are using? I'm having real trouble finding something like that here in Denmark, having to resort to folded felt and polyfill.
It's acoustic foam (i think). A Pro Sound store would sell it for deadening sound. This look like the BBBIBs using the Eminence 12lta. It will need a tweeter. I bet it has a powerful sound! Awesome!
6.5 With Bass
It has probably been years since I posted anything on here. I just keep enjoying my Fostex 208 sigma BIB's in my spare time. I think the FE166 is a good driver. I used it in my first pair of speakers (Voigt Pipes). However, I remember once LONG ago Scottmoose had tried the FE166 and then the FE165 in a BIB. As I recall, he said he liked the FE165 quite a bit more, and that it subjectively had more bass. I believe the two drivers are about the same price. I don't have any experience with the 165 myself.
It has probably been years since I posted anything on here. I just keep enjoying my Fostex 208 sigma BIB's in my spare time. I think the FE166 is a good driver. I used it in my first pair of speakers (Voigt Pipes). However, I remember once LONG ago Scottmoose had tried the FE166 and then the FE165 in a BIB. As I recall, he said he liked the FE165 quite a bit more, and that it subjectively had more bass. I believe the two drivers are about the same price. I don't have any experience with the 165 myself.
The 165 sounds very balanced in a BIB (and probably the C&C speakers) but i wouldn't call them bassy. They just provide the right amount of bass for smaller rooms IMO. I setup H-frames (using 15" Alphas) which enhanced the bass of the 165s alone in BIBs. I also used a rear firing super tweeter to enhance the treble but it was barely noticeable and probably subjective in need.
I just completed my Fostex FE168 Sigma BIB. The Fostex is the older style with whizzer. I actually built a trial box last December, and the results were good enough to try and make it pretty. BIB dimensions: line length - 125 in; zdriver - 27.125 in; internal width - 7.75 in; internal depth - 11 in; a-b-c - 5.5 in. I used two sheets of sandeply 3/4 in plywood from Home Depot. It's advertised as void free, but next time around I will look for something better. My samples had lots of voids.
I used solid ash for the front and very thin oak plywood veneer for the sides. I glued the ash to the front just proud of the sides, and butted up the plywood veneer to the ash. The ash has a 5/8 in roundover. I finished without stain, using General Finishes Polyacrylic water based topcoat - satin for a topcoat. The polyacrylic finish went on like a dream - no dripping or brush marks, without only light sanding between coats with a 3m superfine pad. I used a foam brush to apply the topcoat.
Thanks especially to Scottmoose for starting the thread and his many contributions throughout. I am enjoying the speakers immensely.
I use either Wright Audio Mono 25 monoblocks (williamson based) or Bottlehead Afterglow 2A3 amps. I listen to these all day without fatigue. No they don't make me like free jazz, or let me stay awake for a Sibelius symphony but the music always sounds good. Not the last word in bass impact but good enough. I don't use or feel any need for bsc.
Here are some pictures of the speakers:
This one show the construction details
excuse my mess, i'm a bit of a slob while engaged in a project
I used solid ash for the front and very thin oak plywood veneer for the sides. I glued the ash to the front just proud of the sides, and butted up the plywood veneer to the ash. The ash has a 5/8 in roundover. I finished without stain, using General Finishes Polyacrylic water based topcoat - satin for a topcoat. The polyacrylic finish went on like a dream - no dripping or brush marks, without only light sanding between coats with a 3m superfine pad. I used a foam brush to apply the topcoat.
Thanks especially to Scottmoose for starting the thread and his many contributions throughout. I am enjoying the speakers immensely.
I use either Wright Audio Mono 25 monoblocks (williamson based) or Bottlehead Afterglow 2A3 amps. I listen to these all day without fatigue. No they don't make me like free jazz, or let me stay awake for a Sibelius symphony but the music always sounds good. Not the last word in bass impact but good enough. I don't use or feel any need for bsc.
Here are some pictures of the speakers:
This one show the construction details
excuse my mess, i'm a bit of a slob while engaged in a project
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Those are indeed quite pretty, masiebers
Very nice cover, that green one in the front. Which album is that?
Very nice cover, that green one in the front. Which album is that?
Thanks kistelifur. The album is Computer World by Kraftwerk. It's a great album. Pocket Calculator is my favorite cut. See the link for a review of the album.
Computer World - Kraftwerk | AllMusic
Computer World - Kraftwerk | AllMusic
Forehead-slap! Of course! I've heard every track on it a million times, but I've actually never seen that cover 🙂