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| The CUBE http://www.diyaudioprojects.com/Forum/viewtopic.php?f=11&t=6893 |
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| Author: | tubelectron [ 29 Aug 2020, 16:28 ] |
| Post subject: | The CUBE |
Not a subwoofer, but a pair of bookshelf loudspeaker enclosures...  OK - I'll pass quickly on construction details - just enough for understanding :     Made from 18mm thick glulam Beech wood, cubical shape (hence the name) at 200x200x200mm, fully stuffed laminar decompression principle, 2-ways with 4" Woofer ( Eltax S-106 or Monacor SP-100/8) and 1/2" Tweeter (Audax TW51A). Next step : radiusing the edges at R=12mm all around with a router.  And... Waxed finish? Oiled ? Tinted ?  -tbln. |
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| Author: | tubelectron [ 30 Aug 2020, 08:17 ] |
| Post subject: | Re: The CUBE |
Radiused :  -tbln. |
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| Author: | tubelectron [ 06 Sep 2020, 15:04 ] |
| Post subject: | Re: The CUBE |
Break-in of the speakers :  These ELTAX S106 woofer hed a Fs at 88 and 92Hz as is, decreased to 80 and 81Hz once broken-in.  I'm waiting for a pair of Monacor SP-100/8 that should show a Fs at 60Hz. So Wait and See...  -tbln. |
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| Author: | Woodo [ 07 Sep 2020, 00:14 ] |
| Post subject: | Re: The CUBE |
Very nice! Trust they sound good. |
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| Author: | tubelectron [ 07 Sep 2020, 14:09 ] |
| Post subject: | Re: The CUBE |
Thanks Woodo ! According to the simulations, I can expect a F3 at 70-75Hz with the Monacor SP-100/8. The Eltax is nicer looking, but has a measured Fs at 80Hz instead of 60Hz spec'ed for the Monacor :  I'm waiting for the Monacor to be delivered, in order to see if I can arrange an universal mounting drilling for both. I'll measure their respective T/S parameters and redo simulations... For the moment, I'm working on my 3-way enclosure. -tbln. |
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| Author: | tubelectron [ 13 Sep 2020, 15:38 ] |
| Post subject: | Re: The CUBE |
Work is on progress...  Cabs drilled :  Speaker choice - I choose the Monacor, not the nicest, but probably with better performances :  Stuffing material and placement :   Crossovers - testing 2 options :  Ready for listening and measurement :  Wait and See... -tbln. |
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| Author: | tubelectron [ 15 Sep 2020, 12:51 ] |
| Post subject: | Re: The CUBE |
First listening tests & comparisons in my small and messy listening room...  The 1st Order 4KHz Butterworth X-Over behaves quite differently compared to the 2nd Order 4KHz Linkwitz-Riley X-Over plus Zobel network... I'm instant A/B-ing them in mono : one speaker with the 1st BTW, the other with the 2nd L-R. No definitive conclusion for the moment -tbln. |
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| Author: | tubelectron [ 19 Sep 2020, 07:39 ] |
| Post subject: | Re: The CUBE |
I'm experimenting / listening new X-overs :  Wait and See... -tbln. |
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| Author: | tubelectron [ 20 Sep 2020, 12:46 ] |
| Post subject: | Re: The CUBE |
After several listening tests in 6 and 12dB/oct, Butterworth/Bessel/Linkwitz-Riley/Chebyschev designs, with and without Zobel networks, Fc at 4000 and 4500Hz, the most satisfactory design listened is this one :  Which is a Linkwitz-Riley design tuned to 4500Hz. It offers a nice tonal balance, low directivity and intermodulation distortion (at high level). The other showed a more or less forward midrange register, very lively at first listen but quickly tiring and ultimately unrealistic. The 6db/oct. configurations showed directivity lobes and "dirtyness" at high volume due to IMD. Also, Fc=4000Hz proved too low (for a tweeter resonance at 2900Hz), accentuating midrange register much more than 4500Hz. I keep all the version of X-overs in order to do some measurements, in order to see if it correlates (or not) the listenings... -tbln. |
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| Author: | Woodo [ 20 Sep 2020, 17:30 ] |
| Post subject: | Re: The CUBE |
I like your analytical approach. I have a lot to learn about diy xovers. In the past I have purchased ready made ones, not really understanding the calculations. I should try harder. It’s Interesting you used ferrite core inductors. For my BSC I used air cored but also bought a pair of ferrite core. In the end the air core fitted the small space better as I originally figured I wouldn’t use a BSC. Next time I will make some space under the box. Do you find the ferrite core sounds better? |
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