In Reply to: RE: It was JA, answering his own question after hearing ESP Concert Grands at my place posted by tad on August 4, 2012 at 21:48:49:
But that doesn't make much difference.
ProAc: The cocktail stirrers/straws (I think they were narrower than regular drinking straws) were a clever idea. The cumulative thickness of the sidewalls of the stirrers did not reduce the width of the port by much, so in terms of frequency reinforcement the port worked pretty much as if the stirrers/straws were not there, but!
The surface area of the insides of the straws was surprisingly large, and that much surface area presented friction resistance to the air moving in and out. I believe that the intent was to minimize "port noises" such as "chuffing," the characteristic sound as an organ pipe starts to speak. The straw approach can be regarded as an early "Variovent." Or not.
Also, by dividing the airflow into a multitude of narrow columns, the "vertical" magnitude of any turbulence within the port would be sharply limited. However, I am not sure how much turbulence there would be in the port of a speaker with a "woofer" as small as the Tablette's.
Why was this dropped? I have no idea. Perhaps the designer decided that developments such as radiusing the ends of ports, etc., gave an overall better result.
JM
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Follow Ups
- Just to clarify, it was my sidebar, in which I quoted JA - John Marks 07:28:26 08/05/12 (2)
- RE: Just to clarify, it was my sidebar, in which I quoted JA - hahax@verizon.net 20:32:56 08/08/12 (0)
- RE: Just to clarify, it was my sidebar, in which I quoted JA - tad 18:25:35 08/05/12 (0)