@mikld wrote:
can expand upon your criticism of the new Jubilees’ ported bass horns ... do any other manufacturers’ or DIYers bass horn place the woofer is in a ported enclosure (vs the typical sealed)? I think Roy said this was his invention and he patented it. I understand the intent is for lower extension, what is the tradeoff in your opinion? Is the bass horn just being asked to perform too far out if its range and start impact the sound negatively?
In the domestic Jubilee’s the ported output via the back wave of the woofers comes out of phase in relation to the output of the front wave of the woofers, as per usual with ported designs, but here it is then - as a summed output - horn-loaded. Quite a few folded bass horns I’ve seen use ports in the woofer chamber, that’s usually sealed, to assist the lower end, but in those cases the ports radiate their output independently of the horn loading, and not into the horn itself like the Jub’s. Both options seem dubious to me being they impact the impulse response in the effort to squeeze out some extra extension/gain in the lower range from a limitedly sized package. Moreover, even though this mayn’t be a practical issue, there’s port noise to deal with, but the horn acts as a low pass filter, so with the Jub’s at least this may be a non-issue.
I have seen some folks on the klipsch forum with the older underground jubilee’s who have done what you recommended, ie, tapped horn for the lowest octaves, Jube horn up to say 400-500hz, then let the K402 take over. I’m not sure Klipsch would dip into tapped horns, as that tech belongs to Danley sound labs, no?
Yes, the tapped horn design is patented by DSL, but my suggestion wasn’t for Klipsch to make/design TH’s, but rather that the users could choose to implement TH’s from either DSL or DIY (DIY’ers are allowed by Danley to fiddle with the TH design as they choose, and who could prevent them) in their setup in conjunction with the Jub’s in their older, non-port incarnation. Or, a classic Front Horn Loaded design for subs, but they’re often hampered by being too small with a stunted mouth area to be their best; if people think TH’s take up a load of space (which they do covering down <25Hz, certainly with 12-15" on up woofers), wait till you see a more all-out FLH with a mouth area to match..
To reiterate: I haven’t listened to the domestic Jub’s, so I wouldn’t know how they perform in the lower mids on down. Maybe Roy has got his patented solution to work just fine sonically, but I suspect there’s a price to pay.