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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: RE: I do agree that designers probably can make the best use of measures, but two questions. posted by tomservo on January 5, 2008 at 08:43:53:
Yes, damping IS a loss mechanism; the idea is that it dissipates stored internal energy.
And for an electro-mechanical/acoustic conversion is lossiness ideal to preserve signal integrity?
cost factor is why many / most of drivers used here, in total or in part come from China now where it is much cheaper to build
Cost is certainly a factor when I design, as my disposable income is finite. But the cost of a rigid vs soft cone is negligible in the overall price of the driver. Look at Harman, Seas, Aura, Tymphany, etc.
I can tell you for sure that regardless of market appeal, an exotic driver which also has a large feature in its breakup range, is not as good as one without.
The logic is that this feature is “safe†when above the crossover point, a logic which ignores the less obvious downside.
We've been through this before on DIYAudio :-). I don't design for "exotic appeal" any more than Linkwitz does. Your argument against hold no water in (competently designed) real world applications. The rigid cones are certainly much harder on XO & system design, but the benefit is lower overall distortion and greater transparency and clarity than soft lossy cones. Some find this microscope (accurate) viewing of their recordings offensive and would rather have some softening cream applied. Some don't.
I have not heard Earl’s speakers and I am not what Norm has but the B&C de-25 had a polyester diaphragm and was a very nice driver. Understand, I am not saying there is no room for other materials, just that usually for cones, it turns out treated paper fiber is very hard to beat.
Nor have I, but I linked some non-audiophool listening tests. Well, unlike paper, which is so great that it is utterly useless for HF diaphragms (I note you said "cones"), aluminum/ceramic composites, etc can be used for any frequency, remarkably well too :-).
Norm's speakers are quite amusing.
http://www.aaudioimports.com/store/ProductDetail.asp?catID=43&subCatID=1&productID=58
Sit down when you read the price :-). Look at the size of that horn maintaining pattern control to (750?)700hz! (I estimate the flare around 10-12" at best). They did a funky oval shape to create varying path lengths to spread the diffraction signature.
"6db" filter (they know better than to state electro-acoustic) fools the buyers into thinking that it is 1st order since audiophiles associate this with "purity" and so much more marketing BS.
The narrow cabinet for visual appeal of course comes att the price of lower frontal area - raising the baffle diffraction loss frequency (or so called step) for the already displacement/efficiency challenged 4x6.5" drivers. An stored energy release resonant port completes the "magical sounding" package :-). Yes, I've heard these and other Acapella's. Awful would be a kind description of the sound.
As far as acoustic considerations for domestic living rooms go, this thread at DIY addressed quite a bit
http://www.diyaudio.com/forums/showthread.php?s=b4f818309b2124ea0bd8f6cb3db880fd&threadid=103813&perpage=25&pagenumber=1
cheers,
AJ
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Follow Ups
- RE: I do agree that designers probably can make the best use of measures, but two questions. - AJinFLA 01/6/0817:09:34 01/6/08 (1)
- RE: I do agree that designers probably can make the best use of measures, but two questions. - tomservo 20:23:46 01/6/08 (0)
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