dhsettim Posted August 15, 2011 Share Posted August 15, 2011 Has anyone (and I guess I mean DJK) thought of porting a Jubilee clone bass cabinet? It seems to me that it is not dissimiliar (very roughly) to the La Scala bass bin and DJK has described successfully porting that speaker. Just thinking....... regards, tim Quote Link to comment Share on other sites More sharing options...
DrWho Posted August 15, 2011 Share Posted August 15, 2011 I know Roy Delgado (designer of tbe Jub) has thought lots about it... Quote Link to comment Share on other sites More sharing options...
seti Posted August 17, 2011 Share Posted August 17, 2011 There was also lots of thought of putting a passive 12 woofer or drone similar to say a chorus II between the two 12 inch drivers in the jubilee. I'd love to hear one of those : ) Quote Link to comment Share on other sites More sharing options...
PrestonTom Posted August 17, 2011 Share Posted August 17, 2011 My understanding was that the porting would be done via a drone. In turn, the drone would be horn-loaded. I beleive there were some prototypes of this made but not necessarily fine-tuned. Yes, we would all love to hear one of those. Quote Link to comment Share on other sites More sharing options...
dhsettim Posted August 19, 2011 Author Share Posted August 19, 2011 Thanks for the comments guys, I had forgotten about the passive radiator versions when I posed my question. I guess I was thinking more along the lines of DJK's mod to the La Scala bass bin as I understand the back chamber of that (and the Khorn) are marginal in volume. I thought maybe the Jubilee back chamber might also be improved. cheers tim Quote Link to comment Share on other sites More sharing options...
seti Posted August 19, 2011 Share Posted August 19, 2011 Thanks for the comments guys, I had forgotten about the passive radiator versions when I posed my question. I guess I was thinking more along the lines of DJK's mod to the La Scala bass bin as I understand the back chamber of that (and the Khorn) are marginal in volume. I thought maybe the Jubilee back chamber might also be improved. cheers tim I'm curious how big of a difference the passive would make but only one way to find out.... SOMEONE HAS TO DO IT!!!!!!!!!! Other than that I'm not sure how much more can be done to improve the jubilee. Quote Link to comment Share on other sites More sharing options...
garyeanderson Posted August 19, 2011 Share Posted August 19, 2011 The Search feature is great. So much info that has been gathered and is available to all that look. those that ask will get the current thinking but there seems to be more available if we just look. I searched on Jubilee AND port with this I found drone so I searched for Jubilee AND drone this found http://forums.klipsch.com/forums/p/77082/761348.aspx#761348 Good reading and great insite. Thank you Seti for getting the discussion going previously. Quote Link to comment Share on other sites More sharing options...
DrWho Posted August 19, 2011 Share Posted August 19, 2011 The problem with rear porting on a horn is that the port SPL is a function of driver excursion. When you've got 110dB coming out of a horn that provides 10dB of gain, the port will only be putting out 100dB. If you aligned the port tuning to where the horn is 10dB down, then you'll be at 106dB assuming you can get the wavefronts in phase. In practice, this only buys a small increase in bandwidth at the expense of a much steeper roll off that is now not excursion controlled. Roy's goal of porting into the throat was to take advantage of the extra gain from the horn. I believe you get a wider Q on the port bandwidth too. Quote Link to comment Share on other sites More sharing options...
DrWho Posted August 19, 2011 Share Posted August 19, 2011 Thanks for the comments guys, I had forgotten about the passive radiator versions when I posed my question. I guess I was thinking more along the lines of DJK's mod to the La Scala bass bin as I understand the back chamber of that (and the Khorn) are marginal in volume. I thought maybe the Jubilee back chamber might also be improved. cheers tim I'm curious how big of a difference the passive would make but only one way to find out.... SOMEONE HAS TO DO IT!!!!!!!!!! Other than that I'm not sure how much more can be done to improve the jubilee. I think the difficulty of this working on the Jubilee is that the distance between the rear wave of the active driver and the drone is too close... Quote Link to comment Share on other sites More sharing options...
PrestonTom Posted August 19, 2011 Share Posted August 19, 2011 Mike, I don't disagree with your comments, but remember there was a drone version of the Jubilee that HDRBuilder posted about. It was mentioned in another post that the prototype had a deeper low end as well as lower distortion. I am not sure how they did it since it is "pretty cramped quarters" in there. I suspect, and we will probably never know, that the vertical ramps (which create the initial rapid flare / rubber throat) were substantially different than what we see in the conventional Jubilee. Quote Link to comment Share on other sites More sharing options...
DrWho Posted August 19, 2011 Share Posted August 19, 2011 If it was better, then why is it not in production? [] Quote Link to comment Share on other sites More sharing options...
PrestonTom Posted August 19, 2011 Share Posted August 19, 2011 If it was better, then why is it not in production? Maybe that will be my next project. I'll tell you, when I built my Jub clones/copies there was not much extra room in there. Note to self: get a large shoe horn Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.