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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: RE: Really?!!!!!!!!! posted by villastrangiato on April 18, 2012 at 11:20:36:
that a sphere has the smoothest diffraction behaviour and the smoothest frequency response.
'Heavy Eq' needed to compensate? By the time the curve has flattened again about a 3db shelf is enough IME and that of most others who have built BDS shelf Eq.
Where did I deny that BDS losses occur with spheres or that it is theoretically more lossy? It does but slowly and smoothly. In real rooms by about 3db by where the FR response flattens again. Heavy Eq?
I am not so much concerned with FR, but with the effects on timing, interplay, expression and nuance which are what acoustic music is about. Villa knows most of the market doesn't much care for acoustic music.
Villa is shrieking to the rooftops that BDS loss is a FLAW of spheres, yet it is by definition present in almost all speakers, but far less smoothly than with a sphere. Right in there between 200 and 400 hz where much that is fundamental in acoustic music happens.
Eq'ing for BDS is built in to almost all 'practical' dynamic speakers even the big ones, 2-ways, even 3-ways, no matter what the shape of the enclosure.
Viz. A '2 and a half way' column with two or more woofers, one covering bass and mids, and one doing bass below the BDS only. OR The tweeter and mids get padding resistors up to -6db worth.
The 2.5 way might seem to be a more transparent way, than using padding R's but doesn't always get good reviews.
The easy way to compensate for BDS - from a sphere - is not heavy Eq or a parametric, but a shelving response circuit in place of or in addition to a bass tone control. Sitting in the near-field and playing a bit louder works for me. So, I'd rather have less circuitry and not bother.
With boxes the FR is no longer smooth, and the compensation ought to be more complex. But most mfrs don't bother to fully compensate the peaks and dips, if at all.
I'd rather have good diffraction behaviour with a smooth BDS curve below about 200hz, than use a box with poor diffraction behaviour.
;-)!
That I happen to have chosen to use spherical enclosures is an educated choice, and I did it because I found that they got out of the way of the music. As predicted by the science.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
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Follow Ups
- For the record, Villastrangio continues battering his way through the fact - Timbo in Oz 17:35:11 04/18/12 (2)
- RE: For the record, Villastrangio continues battering his way through the fact - jimdgoulding@yahoo.com 22:49:21 04/18/12 (1)
- RE: For the record, Villastrangio continues battering his way through the fact - villastrangiato 04:39:08 04/19/12 (0)
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