you could ask XRK971 for a punchy alignment in akabak with the little Eminence 8 specs
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
Or if you have Windows, get David McBean's wonderful hornresp program and make estimates as a series bandpass. I would do that for you if I still had access to hornresp.
You could probably make a decent guesstimate treating it as a bass reflex but shortening the vent somewhat as the front aperture acts partly as the vent.
Using an online reflex calculator that 8 inch Eminence should do 50Hz in 25 liters so one cubic foot is enough for the rear chamber and driver. The front chamber's volum might be chosen to be 1/3 that of the rear chamber. The vent's area needs to be made larger than in the example below. There should be online vent calculators for a given volume and Fb.
XRK971's original Beta8cx XKi is probably pretty close to what you could use
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
Or if you have Windows, get David McBean's wonderful hornresp program and make estimates as a series bandpass. I would do that for you if I still had access to hornresp.
You could probably make a decent guesstimate treating it as a bass reflex but shortening the vent somewhat as the front aperture acts partly as the vent.
Using an online reflex calculator that 8 inch Eminence should do 50Hz in 25 liters so one cubic foot is enough for the rear chamber and driver. The front chamber's volum might be chosen to be 1/3 that of the rear chamber. The vent's area needs to be made larger than in the example below. There should be online vent calculators for a given volume and Fb.
XRK971's original Beta8cx XKi is probably pretty close to what you could use
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Thanks X. - - I'll have to look at these two XKi and suggested vent mod to one. Seems to me Beta8CX would not be too untuned if in the B&C CX cabinet
hey X - - regarding your suggestions of an XKi for my P-Audio SN10C does this sketch look close enough?
The suggestion was 12"x12"x16" internal
I think there's about 23 liters in the rear chamber after driver displacement so a bit undersized vs 25.5 liter. The front is about right.'
How far would you gap the front edge of the vent to the inside of the aperture?
The suggestion was 12"x12"x16" internal
I think there's about 23 liters in the rear chamber after driver displacement so a bit undersized vs 25.5 liter. The front is about right.'
How far would you gap the front edge of the vent to the inside of the aperture?
Finally completed my little K5 cabs modified to add an XKi style duct feeding the shelf vent already in the cabs. The drivers are PA130-8s fed from a 50w x2 Chinese Bluetooth amp. I am sitting here listening to Amy Levere who accompanies herself with a contra bass. The bass is incredible for a 5" speaker in a small cab. Evaluation is subjective as I don't have windows or test software.
I experienced an interesting illusion. Anxious to hear the K5s I just had them sitting near my feet and was listening as I read a book on-line. It seemed that the sound was coming from across the room and I really had to concentrate to place its origin at my feet.
- anyone here game to make improvement suggestions on these two K-type?
larger one is for Delta10a but assume would work also for my Tymphany10
little one is for midrange only with an eight inch B&C.
larger one is for Delta10a but assume would work also for my Tymphany10
little one is for midrange only with an eight inch B&C.
The only short screws I had on hand were ¾" flat head #4, not the best for easy driving or removal. I will pick up some ¾" Phiilips or square drive pan head #6 so that I can easily remove the rear panels for padding experimentation. I only lined the speaker chamber with felt (laminate floor underlay)for starters.
I tried to make my "sketch" of a 10 inch driver XKi more legible.
What do you think of the vent and front chamber shape? - it was suggested years back by XRK971 to use an 8 inch long vent for Delta10A. I might want to use this cabinet with the 10" "pro" Tymphany driver.
Besides the front chamber and vent, how would you do the taper panels and their starting gap?
With half inch material it should be about 13"x13"x17" tall
What do you think of the vent and front chamber shape? - it was suggested years back by XRK971 to use an 8 inch long vent for Delta10A. I might want to use this cabinet with the 10" "pro" Tymphany driver.
Besides the front chamber and vent, how would you do the taper panels and their starting gap?
With half inch material it should be about 13"x13"x17" tall
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If you run a bass reflex calculator for the rear chamber and vent dimensions, that should work. No taper on vent, just straight parallel wall. One thing to be careful of is vent resonance frequency with longer vents. 8in long vent might cause a dip at 840Hz (1/2 wave). But usually not a problem as Karlson “W” is around there anyway.
might it help any to cut the duct length to say 6 inches - ? - - - cut a "V" or "K" notch on its back side. - ? Shelf vents often tune ~15% lower than some vent calculators show.
Freddi, I played your Steve Clarke link through my K5/XKi PA130 hybrids and it sounded pretty good. I am going to have to do some additional felt lining to reduce tunnel sound on some vocal passages.
Your proposed 10" cab makes for a neat sized cab, is it for guitar?
If I decide to modify my K8 (scaled from K12) I wonder if blocking the horizontal vent and adding a 2" PVC pipe duct would work . . . the cab is smaller so the PVC would have to have a downspout but that down section length could be an experiment . . . and maybe a K slot.
Your proposed 10" cab makes for a neat sized cab, is it for guitar?
If I decide to modify my K8 (scaled from K12) I wonder if blocking the horizontal vent and adding a 2" PVC pipe duct would work . . . the cab is smaller so the PVC would have to have a downspout but that down section length could be an experiment . . . and maybe a K slot.
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I had a listening session halfway through painting. The speakers have awesome bang and clarity for the buck. Here driven by B1K + ACA. I was surprised how well defined and low they get.
My woodworking skills have become better but need improvement. I had to do everything by hand without table saw.
I thought a report was in order for a thank you for a rewarding project.
Som pics in progress.
My woodworking skills have become better but need improvement. I had to do everything by hand without table saw.
I thought a report was in order for a thank you for a rewarding project.
Som pics in progress.
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sov. that's a beautiful build - good idea for damping material placement in the upper rear cavity too.
- did you have a powered circular saw? - - or literally a hand saw?
EddieT - yeah with Delta10A that should make a pretty good little bass cabinet. Would it help to more the "reflector" forwards on the shelf vent? (like in standard XKi builds such as sov's)
I'm liquidating all of my toys to try to survive month to month and hope sometime to get some hernia repaired.. - got one Kramer bass I'd like to keep.
There's also this "rock n' roll" bass 🙂
https://i.imgur.com/sqpPJHF.jpg
- did you have a powered circular saw? - - or literally a hand saw?
EddieT - yeah with Delta10A that should make a pretty good little bass cabinet. Would it help to more the "reflector" forwards on the shelf vent? (like in standard XKi builds such as sov's)
I'm liquidating all of my toys to try to survive month to month and hope sometime to get some hernia repaired.. - got one Kramer bass I'd like to keep.
There's also this "rock n' roll" bass 🙂
https://i.imgur.com/sqpPJHF.jpg
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This guy gets a lot of E₂ (82.4Hz) into his work;
Come Together - Michael Chapdelaine - Video (solo fingerstyle guitar) cover - YouTube
Come Together - Michael Chapdelaine - Video (solo fingerstyle guitar) cover - YouTube
I think one of these little track saws would be good for sheet goods but a bit expensive unless one has other uses for it.
I got a Graff Termit blade for my cheap Harbor freight angle grinder. Turns it into one of those mini saws for about a third of the proce, and it cuts nice and clean through thin Ply.