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RE: Rear port pros and cons (not an unbiased opinion)

I chose not to use down-firing ports mainly because they are more difficult to access for changing port length, but otherwise have no objection to them for a floorstander. I'm not sure how practical they are for a stand-mount speaker, where you really don't have effective boundary reinforcement. For a stand-mount speaker, rear porting may be the better configuration for taking advantge of boundary reinforcement.

I don't understand what horn loading and concentric (coaxial?) designs have to do with port location. If you're saying that in some cases the port is supposed to contribute to the midrange output, then I'd disagree strongly with that design approach.

There are arguments for a rear-firing port aside from boundary reinforcement, as indicated in my previous post. If the port length is fixed (as is usually the case), then it could well be argued that a rear-ported speaker designed with boundary reinforcement in mind is particularly placement sensitive. On the other hand, a rear-ported speaker whose port length is user adjustable is extremely room-adaptable.

In my experience, the low-frequency acoustic environment changes very significantly from one room to another, so I place a high priority on the ability to make large adjustments to the low frequency characteristics of a loudspeaker. I have encountered rooms where speaker positioning alone could not give balanced-sounding bass, and significant adjustment of the speaker's output was necessary.

Duke

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