narrow and wide baffles and imaging


According to all the "professional" audio reviews that I've read over the last several years, narrow baffles are crucial to creating that so-desired pin-point imaging.

However, over the last few weeks, I've had the opportunity to audition Harbeth 40.2, Spendor Classic 100, Audio Note AN-E, and Devore O/93.  None of these had deficient imaging; indeed I would go so far as to say that it was good to very good.

So, what gives?  I'm forced to conclude that modern designs, 95% of which espouse the narrow baffle, are driven by aesthetic/cosmetic considerations, rather than acoustical ones, and the baffle~imaging canard is just an ex post facto justification.

I can understand the desire to build speakers that fit into small rooms, are relatively unobtrusive, and might pass the SAF test, but it seems a bit much to add on the idea that they're essentially the only ones that will do imaging correctly.



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Showing 7 responses by twoleftears

@prof  Hmmm.  In my auditioning of the 40.2's in a big room in which they could well and truly breathe, they both imaged and sound-staged extraordinarily well.  The Classic 100's in another set-up also did very well on both scores, to my mind.

@analogluvr I agree.  I mean, if it were as simple as narrow good, wide bad, why would these modern wide speakers perform as well as they do, even if they are not perhaps the equal of the absolute imaging champs.

@mindlessminion I think I'd have to say the 40.2's, though the Classic 100's were at a different place, in a different room, with totally different equipment.  Both very good indeed.  The Audio Note's had perhaps the greatest purity of sound, the highest truth-to-timbre, more like the live acoustic instruments than perhaps anything else I've ever heard.  But despite their claims to the contrary, I did think their positioning close to the front wall, as is traditional with them, did tend to foreshorten a little the soundstaging, and reduce a little the general airiness.  Of the four mentioned, I liked the Devore least, though they were fine. 

@shadorne Interesting.  If I understand correctly, those parameters would put both the Harbeth and the Spendor into your "worst" category.

@kosst_amojan How wide is wide in your reckoning?  Also wondering how proper radiusing of corners mitigates other problems.

So what about the SF Elipsa series, which if memory serves is a good deal wider than any other SF models?  Did SF ever provide a rationale for why they did the Elipsa's that way?

@prof  Exactly!  That's precisely what struck me--and impressed me--auditioning the 40.2s and Classic 100's.  The "sound launch", for want of a better term, seemed more substantial, had more body, than just about anything else I've heard.  Besides narrow/wide baffles, made me wonder too about woofers located on the sides or back of the box, rather than on the front.

@kosst_amojan OK, I'll bite.  By imaging I understand individual sound sources (voice, instrument) being well defined and easily localizable within the overall sound stage.  Ideally, the listener should be able to map, more or less precisely, where each "instrument" is on the left to right axis and, at least to some extent, on the front to back and high/low axes.  Also, importantly, the instrument should not appear to be substantially larger or smaller than the other instruments in the soundstage than it is in real life.  Example: a three foot wide clarinet.

Here's an interesting design.

http://www.troelsgravesen.dk/PMS.htm

Notice that there's no attempt to take advantage of what could be the total internal volume; the enclosure remains a box, and the front and rear baffles, as far as I can see, don't even join up at the sides.

So what we need is a 19" front baffle?

An additional advantage is we can then install a nice large front-firing woofer.