seems like an XKi - maybe with decent 12" speaker, would make a fun little bass guitar cabinet. When I first heard a 0.8 scale K15, I noted how thick and good notes on the "G" string sounded compared to direct radiator.
A regular K12 has around a 16 liter front chamber - an XKi might have somewhat less so resonates higher. A smoothing stub could be used but might detract from tone. Response reasonably solid to the mid - 60's would probably suffice for a 4 string bass.
A regular K12 has around a 16 liter front chamber - an XKi might have somewhat less so resonates higher. A smoothing stub could be used but might detract from tone. Response reasonably solid to the mid - 60's would probably suffice for a 4 string bass.
I am fascinated with this design. I admit I read a lot of the earlier 2015 entries and then skipped ahead, though. It seemed like the designs presented were intended for full range, but I'm assuming it's acceptable to run as a midbass/woofer to compliment a DML, perhaps XO'd @250 or so?
It seems like an Eminance 8" paper cone pro might be a good budget candidate? Eminence 8" Paper Cone Professional Woofer 8 Ohm
Could this be executed with 1" Xps as well, with a front panel, or maybe 1.5"?
It seems like an Eminance 8" paper cone pro might be a good budget candidate? Eminence 8" Paper Cone Professional Woofer 8 Ohm
Could this be executed with 1" Xps as well, with a front panel, or maybe 1.5"?
if maybe a "FAST" or a 3 way - - FWIW I don't like the looks of that ~7dB dip. PE's graphs are a PITA for my old eyes to read. It's 5mm xmax is attractive if pounding bass.
Beta 8A should be smoother. There might be better choices overall for the same money or less. PE also has a midrange version of similar motor used by Community,
Diysoundgroup has Volt8 coaxial for ~$45 sans shipping - don't know how much they differ from Beta8CX. Ask Erich
Volt 8 woofer
Delta10A would be punchy as tuned for Karlson - have to ask X what it would do in XKi as I don't have
a way to run hornresp anymore.
1" XPS should work pretty well if braced.
Hopefully XRK971 will have some ideas
Beta 8A should be smoother. There might be better choices overall for the same money or less. PE also has a midrange version of similar motor used by Community,
Diysoundgroup has Volt8 coaxial for ~$45 sans shipping - don't know how much they differ from Beta8CX. Ask Erich
Volt 8 woofer
Delta10A would be punchy as tuned for Karlson - have to ask X what it would do in XKi as I don't have
a way to run hornresp anymore.
1" XPS should work pretty well if braced.
Hopefully XRK971 will have some ideas
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if you're intrigued by a big magnet motor - here's a 10". Due to the stupid CV19 situation, I could not get anyone to look up its specs at Eminence,
with its label and looking down the vent, it almost does look like a CX which has had an opaque dustcap added (??). That may be an 80oz slug. If so, I'd like to know if the internal horn were retained.
Eminence 500? Watt 4 Ohm 10" PA Woofer Speaker 1025CXK/105-6 Cast Basket OEM USA | eBay
with its label and looking down the vent, it almost does look like a CX which has had an opaque dustcap added (??). That may be an 80oz slug. If so, I'd like to know if the internal horn were retained.
Eminence 500? Watt 4 Ohm 10" PA Woofer Speaker 1025CXK/105-6 Cast Basket OEM USA | eBay
Thanks so much, Freddi. I know the beta is tried and true, and a 10 would would give me more depth and spl potentially but enclosure size and power limitations are what have me looking at something smaller and less power hungry. I have a concept for this combo as a small, lightweight and low power PA setup with a sort of line array design. A novel and sexy alternative to 4 powered PA cabinets. Power would be from a pair of Tpa3116d2, so 110wrms per channel. Slightly under the RMS rating for the 8" paper cone pros. Not even sure if the combo would work as intended as I'm just starting development of the DML's, so I don't want to over invest. Of course I have some 6s and 8s laying around but they're all high QTS and/or DVC units better suited for OB/IB use. Anyhow, If proof of concept works out I could scale up from there.
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If building with plywood how are the rear panel and wings sealed? I am considering gaskets made of thin cardboard as my ⅜" fir is not as smooth as Baltic birch.
That dip doesn't concern me as it's above 500hz and I would be crossing it over well below that. This would be more or less a party woofer to complement a full range driver without much extension below 150. I'm just looking for punch for dance music that would work well in both open and enclosed spaces. I have run cheap single reflex 8 inch PA speakers at outdoor receptions and garden parties and they gave me adequate thump for the situation, and I'm assuming an XKi would perform better in both spl and extension. Room acoustics indoors will only help I would think, and I will have the ability to EQ for either. My goal is a lightweight build that will hit the sweet spot between size and output. Tapped horn design like a Spud would be larger than I'd prefer and single reflex ported would be less efficient. XKi seems like the best compromise? The low Fs and High Xmax on that Eminence 8 pro along with the low qts and rms power handling near my limit all make it look like a good candidate but I'm open to other options. I didn't see any T/S parameters on the volt-8 woofer and the Fs and xmax on that delta 10 look high and low, respectively.
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that Eminence is for you and imagine Volt8 to be spec-ed by Eminence to have 3.2mm xmax. I too like the idea of things to run off a battery and 3116. A 20V tool battery will work - but don't know how long one can play - any idea?
Thanks, man. Now what would it take to get a build sheet for one of these enclosures? I can build stuff but I have no clue how to spec this out in software ��
I'm not sure how long it would run. I'm presuming I would have access to mains power in most cases but I also have one of these - https://www.amazon.com/dp/B07SG4QG47/ref=cm_sw_r_cp_apa_fabc_dlC_vIqQFbYEEBKWF?_encoding=UTF8&psc=1 and I was able to run an 800w class D amp pushing 2 10" PA's for about 3 hours at party volume and still have juice to spare. So I'm guessing I would be able to push a pair of tpa3116d2 for almost twice that long or more.
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Unfortunately I already have 2 3116d2 and a 24v psu and would rather not spend almost double that to move up to 3255s right now. Good to know, though.
Same DCDC step up gets you 22v from 12v lead acid battery for max power from your 3116 if using battery.
A 3116 amp is really nothing - about $6 for Sanwu mono PBTL unit nowadays? I used that for years and was very happy. It won’t make much more than 25w clean into 8ohms though.
A 3116 amp is really nothing - about $6 for Sanwu mono PBTL unit nowadays? I used that for years and was very happy. It won’t make much more than 25w clean into 8ohms though.
Their spec is 110w into 4ohms and 50w into 8ohms. But that’s 10%THD. I meant keeping it below ~0.5% THD. Look at Fig 10 in the data sheet for 24v BTL and 8ohms distortion. The curve hits a wall and goes up really steep. So keeping it 25w at 8ohms is a practical number for good sounding music.
https://www.ti.com/lit/ds/symlink/t...06261&ref_url=https%3A%2F%2Fwww.google.com%2F
https://www.ti.com/lit/ds/symlink/t...06261&ref_url=https%3A%2F%2Fwww.google.com%2F
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did you decide on cabinet size and vent yet for the XKi?
here's the numbers for X to run
Def_Driver ‘Parts Express 290-4007’ | Eminence 8 inch Buyout woofer, 5.1mm xmax
Sd=214.2cm2
Fs=37Hz
Mms=22.3g
Qms=8.34
Qes=0.34
Re=5.19ohm
Le=0.87mH
Vas=53.525L
here's the numbers for X to run
Def_Driver ‘Parts Express 290-4007’ | Eminence 8 inch Buyout woofer, 5.1mm xmax
Sd=214.2cm2
Fs=37Hz
Mms=22.3g
Qms=8.34
Qes=0.34
Re=5.19ohm
Le=0.87mH
Vas=53.525L
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Thank you. I was looking at a 3rd party sheet rather than a TI sheet, so THD specs were unclear. That will teach me. I was specing the test rig for biamped DML's, which the 3116s would have more than adequate power for. If I decide to go the FAST / WAW route I will probably just add a 3255 with its own power I guess. Thanks for the heads up
No. Like I mentioned earlier I have no real idea how to calculate something like this. I am a carpenter and a mechanic but I know nothing about akabak, etc. And then even if I had the numbers I wouldn't be sure how to translate them into a design. My skill set ends at basic sealed and single reflex ported box design, I'm afraid.
It seems like X has often used Vas as a baseline and made recommendations from there depending on the first Sim outcomes?
I alternatively have deep interest in a variation on X's "Light as air" design and I have attempted to briefly revive that thread, as the original drivers are no longer available.
https://www.diyaudio.com/forums/sub...slot-loaded-band-pass-sub-16.html#post6405201
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There are other drivers that can be used. I have a thread for Alpine 10SWD2 or 12SWD2 driver on the same type of cabinet. That’s much bigger of course but if you are looking for PA style SPL, might be the way to go.
Alpine | S-W10D2
Alpine | S-W12D4
PP Slot Loaded Sub with Alpine SWR 12D2
Alpine | S-W10D2
Alpine | S-W12D4
PP Slot Loaded Sub with Alpine SWR 12D2
Again, trying to keep the cabinet small and extra light and the power requirements low. Cheap 8" PAs have been adequate for the scenarios I have in mind. That's why I'm leaning towards an 8" XKi or a 5 or 6 inch Lighter than air. For bigger sound I would haul out larger powered PAs, but this is an experiment in elegance and efficiency.