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
looks a lot like a mini onken to me....
Meet the Fonkens
Thanks for the link @turk 182 : I did not know those Fonken...
A+!
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+!
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+!
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+!
i like the guitar type "tone " control for the tweeter level knob! and the "fan" grills!
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+!
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Those little Audax tweeters are quite a bargain, I’ve used them before as ‘ambience’ Super tweeters.
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+!
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