Thanks ! 🙂
Edges radiused at R=12mm :
This is a pair of small 2-Way bookshelf enclosures, using a 1/2" AUDAX TW51A tweeter and a 4" ELTAX S106 or MONACOR SP-100/8 woofer.
The dimensions are 200x200x200mm, hence the name "The CUBE". 😉
Beech wood glulam 18mm thick for the cabinet.
Plywood 10mm thick for the vents walls.
Principle : laminar decompression + full cotton wool stuffing matress.
-tbln
Edges radiused at R=12mm :
This is a pair of small 2-Way bookshelf enclosures, using a 1/2" AUDAX TW51A tweeter and a 4" ELTAX S106 or MONACOR SP-100/8 woofer.
The dimensions are 200x200x200mm, hence the name "The CUBE". 😉
Beech wood glulam 18mm thick for the cabinet.
Plywood 10mm thick for the vents walls.
Principle : laminar decompression + full cotton wool stuffing matress.
-tbln
Woofer break-in operation :
- on variable break-in / Xmax inspection generator (left)
- on 50Hz break-in generator (right)
Fs values decreased from 88 and 92Hz as is, to 80 and 81Hz once broken-in.
Those Eltax 4" are neat looking but the Monacor SP-100/8 should show a lower Fs at 60Hz. By he way, I'll make a complete T/S parameter mesurement for each.
So wait and See... 😉
A+!
- on variable break-in / Xmax inspection generator (left)
- on 50Hz break-in generator (right)
Fs values decreased from 88 and 92Hz as is, to 80 and 81Hz once broken-in.
Those Eltax 4" are neat looking but the Monacor SP-100/8 should show a lower Fs at 60Hz. By he way, I'll make a complete T/S parameter mesurement for each.
So wait and See... 😉
A+!
Very interested to see more as this progresses, and to hear how it turns out with regard to sound. Something about the 'Onken' layout is fascinating to me, beyond any rational explanation, and it looks really good with the glued-up wood.
Thanks @kd1yt ! 🙂
The cabinets are ready for tests - finishing will come later :
I have the choice between two speakers :
The ELTAX S-106/8 is nicer, but the Monacor SP-100/8 has probably better performances, so I went for the Monacor...
Next step : stuffing, insatlling speakers, crossover tests...
I'll start with a 12dB/oct 2nd order L-R or Bessel type, @4KHz, adjustable constant Z L-pad for the tweeter.
I'll also do a test with a 6dB/oct 1st order, as the speakers are very close and small, in order to see if it can work (I'm skeptical, though... 😕)
Yes : in that micro-Onken/Jensen style, a French company named AdeLine offered the model A323 in the early 80s, a bit bigger than mine, with a larger dual-coil 5" woofer :
Wait and See... 😉
A+!
The cabinets are ready for tests - finishing will come later :
I have the choice between two speakers :
The ELTAX S-106/8 is nicer, but the Monacor SP-100/8 has probably better performances, so I went for the Monacor...
Next step : stuffing, insatlling speakers, crossover tests...
I'll start with a 12dB/oct 2nd order L-R or Bessel type, @4KHz, adjustable constant Z L-pad for the tweeter.
I'll also do a test with a 6dB/oct 1st order, as the speakers are very close and small, in order to see if it can work (I'm skeptical, though... 😕)
Yes : in that micro-Onken/Jensen style, a French company named AdeLine offered the model A323 in the early 80s, a bit bigger than mine, with a larger dual-coil 5" woofer :
An externally hosted image should be here but it was not working when we last tested it.
Wait and See... 😉
A+!
Stuffing material :
Placement :
Crossovers (tentatively external for tuning) :
Ready for tests (with provisional back plate) :
Wait and See... 😉
A+!
Placement :
Crossovers (tentatively external for tuning) :
Ready for tests (with provisional back plate) :
Wait and See... 😉
A+!
Last edited:
If that is meant to be a reflex cabinet, I think that much stuffing will just turn it into an aperiodic cabinet and you won’t have any bass. I would line the walls with it but not fill the main volume with it. Keeping the wool away from the vent and the back of the driver.
@xrk971 :
Yes : it was intended to be a laminar decompression "as aperiodic as possible" cabinet, hence the important stuffing quantity vs the volume (3L neat, stuffed circa 70-75%).
With that, I measured 1st resonance at 50Hz and 2nd resonance at 110Hz. So it's rather a "wannabee aperiodic damped bass-reflex"...
The bass level is not so bad for the very small size, and is most of all regular without muddiness, enhnaced by a bookshelf / corner placement.
That said, what you suggest is to be experimented... 😉
A+!
Yes : it was intended to be a laminar decompression "as aperiodic as possible" cabinet, hence the important stuffing quantity vs the volume (3L neat, stuffed circa 70-75%).
With that, I measured 1st resonance at 50Hz and 2nd resonance at 110Hz. So it's rather a "wannabee aperiodic damped bass-reflex"...
The bass level is not so bad for the very small size, and is most of all regular without muddiness, enhnaced by a bookshelf / corner placement.
That said, what you suggest is to be experimented... 😉
A+!
Those little Audax tweeters are quite a bargain, I’ve used them before as ‘ambience’ Super tweeters.
Thanks @turk 182 ! 😉
Well, it's a provisional back plate, for the setup/tuning of the X-over...
I'm now instant A/B comparing in mono a simple 4KHz 1st order Butterworth (one speaker) with a 4KHz 2nd order Linkwitz-Riley plus Zobel network (the other speaker) : very different tonal behavior between the two... 😕
And yes : the fan grids is a simple rather and unseen way to protect speakers - it's not the 1st time I use this "trick" 😀
A+!
Last edited:
True @moutainman bob !
They are super-small, quite efficient (91-92dB IIRC), omnidirectional, ruggered... Their only drawback is their 2900Hz resonance which is the reason why I cut them (HPF) at 4KHz - which is I think the minimum. 😱
A+!
Yah, 4K is safe I’d say.
I think I ran just a small value cap that filled in over 12k or so.......love your work btw
The new ‘bread boards’ would look good on any kitchen counter!
I think I ran just a small value cap that filled in over 12k or so.......love your work btw
The new ‘bread boards’ would look good on any kitchen counter!
