Originally Posted by kjfalls
What does he say about loading? A port loaded speaker of the same size will have deeper bass, higher sensitivity over an acoustic suspension loaded. A horn loaded speaker will have similar increases over port loading. All without increasing the size of the cabinet.
I don't argue the current Klipsch' may not be as efficient. It may be why I prefer the earlier models. Thanks for the feedback.
If a given driver works well in both a sealed and ported enclosure, the ported enclosure will be larger in almost every case. The sensitivity will be the same between the two except near the tuning frequency of the port, but it's going to be a larger enclosure than a sealed one. I've never seen a small horn loaded bass enclosure before.
Now Hoffmans Iron Law applies to bass frequencies of course, but if one wants a small enclosure and deep bass, sensitivity will be low. If they want a small enclosure and high sensitivity, low bass will be very limited. If they want low bass and high sensitivity, the enclosure will be large. Think of pro audio woofers, their sensitivity is generally pretty high, but so is their Fs, and they also need fairly large enclosures.
There are ways to increase bass frequencies and the sensitivity, but it's always at the expense of a larger enclosure.
Klipschhorns are massive as are other high sensitivity speakers such as the Altec Lansing Model 19, and even with those two examples, the lowest bass frequencies are still limited to a degree. When Klipsch sells a small bookshelf speaker, and if the frequency spectrum is to be balanced, using a horn loaded tweeter, they either have to pad the tweeter way down which of course lowers the overall averaged sensitivity, or they would have to make an awful sounding, very unbalanced speaker. I have no idea where they pull some of their sensitivity numbers from, but it can't be from actual measurements.