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Multi-Way Conventional loudspeakers with crossovers

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Old 4th March 2012, 05:38 PM   #11
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RS stands for what ever you like. It's just sounded better than the NaO IIa. Let's just say it distinguishes this model from the previous one. Of course, if I worked for Infinity.....
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Old 4th March 2012, 06:14 PM   #12
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very interested in the woofer configuration. Will you have any info on your site?
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Old 4th March 2012, 09:08 PM   #13
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Interesting woofer setup. So are they 2 woofers and the u-frame tapered at the back?

And so why can't this be blocked as sealed as well. I thought this was a really nice feature which dipole frames can't do.

Regarding the look, it is less "industrial" than NaO II, but I personally dislike the side panels? Some Orion buildiers also trying to get away from it! Also the plain baffle seems to be acoustically more correct?
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Old 4th March 2012, 10:10 PM   #14
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Quote:
Originally Posted by buzzforb View Post
very interested in the woofer configuration. Will you have any info on your site?

It still follows the design concept for U-frames as on my web site.

NaO U-frame

Quote:
Originally Posted by gainphile View Post
Interesting woofer setup. So are they 2 woofers and the u-frame tapered at the back?

And so why can't this be blocked as sealed as well. I thought this was a really nice feature which dipole frames can't do.

Regarding the look, it is less "industrial" than NaO II, but I personally dislike the side panels? Some Orion builders also trying to get away from it! Also the plain baffle seems to be acoustically more correct?
Yes, still two woofers. The back could be blocked off but ultimately it [only] yields 6dB greater max SPL at 30 Hz. And the sealed woofer just doesn't sound as good.

If anyone prefers to build the older NaO II all they have to do is ask for that plan set. But from the feedback I have received so far I would say that they would be in the minority.

The side panels on the II RS are not very wide and have no significant impact on any aspect of the system performance. As you can see from the picture, the rear of the speaker remains very open. The side panels don't widen significantly until below the lower midrange driver. That, coupled with the removal of the braces and the slanted woofer enclosure opens up the rear considerably.
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Old 5th March 2012, 08:35 PM   #15
ttan98 is offline ttan98  Australia
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John,

Is the speakers tilted backwards, if yes how many degrees?
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Old 5th March 2012, 11:11 PM   #16
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John,

Is the speakers tilted backwards?
No.
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Old 7th March 2012, 09:12 PM   #17
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Ah- a tapered U-frame. Nice idea! I suppose the Note could also be done this way?

Better looking than the IIa I think. I always thought the 'stick' braces spoiled the appearance, even though they are perfectly sensible in engineering terms. Does tapering the frame mitigate or distribute the 1/4 wave resonance?

Last edited by Toaster; 7th March 2012 at 09:20 PM.
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Old 7th March 2012, 10:13 PM   #18
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Yes the Note can be and will be done this way. The original woofer cabinets can be converted with a little effort and careful saw work.

The tapering doesn't seem to do much about the resonance. Slight change in frequency but just as high Q undamped. However, since the volume velocity is higher (rear opening is approximately = to the total Sd of the woofers) the damping is more effective and less stuffing seems to be required.
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Old 7th March 2012, 10:28 PM   #19
Toaster is offline Toaster  United Kingdom
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Neat. The only thing I've built so far is the bass bin, so it's handy it can be converted. I'll 'mail you about the plans for this new version John. I really must get the bass section built at least...
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