MMurg Posted October 31, 2022 Share Posted October 31, 2022 After living with the Heritage Jubilee in my smallish (13’ x 17’) living room for about three months now, I have a few insights and tips that have improved my enjoyment that I’d like to share. Apologies for the length but I wanted to include as much detail as possible in the hope that this is helpful for anyone who has purchased them or may be considering a purchase. I also apologize if some of this may be old news to some, such as Underground Jubilee owners, but it was new to me. The first major insight has to do with positioning the Jubilee. About a month after getting the Jubilee someone on the Klipsch Forum asked me how I was liking them. My only complaint at the time was that I couldn’t listen to a lot of the not-so-great recordings on this system. I was unable to EQ them to sound decent the same way that I did on my other systems. So, I decided to use my UMIK-1 microphone with the REW software to see if I could figure out the bad recording mystery (which I had recently learned how to use during "the speaker project that must not be named" 🙂). Thanks to Klipsch Forum member @Chris A for all the help with REW, interpreting the measurements, and help with the solutions during this effort too. First, I made a few near field measurements at 1 meter on-axis horizontally to see the response in the mids and highs uninfluenced by the room (above the Schroeder frequency). My first measurements were at the height of the dividing line between the LF and HF sections, about ear height. I wasn’t sure where I should be measuring these speakers, and this seemed like a reasonable place to try. However, the response was not flat at that that location. It looked more like a bell curve. There was a broad hill from about 4 kHz to about 11 kHz and a tail off above that. So, I moved the measurement position to on-axis vertically as well with the K-402 horn. Now the response above the Schroeder frequency was nice and flat. This information turned out to be the key to what I was experiencing. When I moved the mic to ear height at the main listening position (MLP) to see what was going on there, the response looked similar to the 1m ear height measurement. Now I understood why the bad recordings sounded worse on this system. My initial setup was to place the Jubilee snugly in the corners at 45° just like Roy had them in the Hope lab listening room at JubFest. This gave me a smidge more separation than pointing them at the listening position as I usually do with speakers. However, doing that in my small room put the K-402 horns too far off-axis horizontally at the MLP. Also, the short distance to the MLP (a little over 9’) put them off-axis vertically as well. That was causing the upper mid and lower high frequency emphasis that was making the bad recordings sound even more shrill. So, I turned the speakers to put the K-402 on-axis horizontally with the MLP. I then tilted the horns down to put the K-402 on-axis vertically with my ear height the MLP. At this point I must mention what seems to be design issue with the Heritage Jubilee top-hat (HF section) that may not allow the horn to be tilted in the way that I was told was intended and what can be done about it. I’ve included pictures where you can see what I’m about to describe. The mounting bracket at the horn throat/driver is fully adjustable and is not the problem. The issue is with how the front baffle and base board are attached together with two L-brackets. I believe Roy mentioned a JubFest that these brackets are supposed to be bendable to allow the horn to be pointed down. However, because the front baffle is butted up against the front of base board and the L-brackets only have circular holes for the screws, any attempt to turn the front baffle down may be prevented as the bend in the L-bracket cannot move forward with the front baffle. I believe that the screw hole in the L-bracket at the base needs to be a slot so that the screw can be loosened allowing the L-bracket bend to move with the front baffle. ***** Update – @Chief bonehead replied to my Facebook post about this saying he had no problem pointing the horn down as is. So, I guess I was in error with my assessment of the L-bracket situation. However, I think I still prefer my method of tilting the horn described below as it doesn’t involve messing with the factory adjustment of the horn/driver bracket or deforming the L-brackets. ***** So instead of trying to tilt the horn down that way, I simply placed a spacer board under the rear of the top-hat base board on top of the bass bin. I determined the angle of tilt that I needed by placing my tripod-mounted UMIK-1 at the MLP at ear height, pointing it at the throat of the K-402, and measuring the angle from level. This was about 6°. So, I experimented with various spacer board heights until I got close to this angle. I ended up using a 2.5” x 2.5” x 18” long poplar square dowel wrapped at the contact edges with some three-layer Duralux shelf liner to prevent the edges from digging into the MDF. This was placed under the rear of the top-hat just behind the two rubber pucks that support the top-hat when it’s level. This got me to within 1/2° of my desired angle. You can’t really use a bigger spacer than this as the two front veneer panels are very close together, a little over 1/16” on one speaker, using a 2.5” high spacer. Any attempt to go to a steeper angle would require lifting the front of the top-hat as well. This might lift it off the three rubber support pucks at the front edge and cause it to slide forward. I can’t imagine needing a steeper tilt than this unless you had an even smaller distance from the speakers, which is unlikely. If you want to try this method of tilting the horn, I recommend that you temporarily put some cushioning material between the two front veneer panels before starting so that you don’t accidentally crash the veneer panels together. I used two pieces of Duralux for that. I’m glad I came up with this method of tilting the horn since it is so easily changed or undone. I wasn’t too keen on loosening the bracket holding up the heavy Celestion driver or bending the L-brackets. Once I had the K-402 on-axis in both directions at the MLP, the response there above the Schroeder frequency was now fairly flat. I put on a few of the not-so-great recordings. They now sounded like they do on my Palladium systems and are correctable with a similar amount of EQ. This also corrected an intermittent imaging issue I experienced. On some recordings, the instruments or vocals at the speaker positions would sometimes be higher than ones in the center, appearing to be at the horn throat height instead of level with the rest. Now, everything is always level and solid with the acoustic center always at ear height. So, my conclusion from this is get the main listening position on-axis with the K-402 horns in both directions for best results. My front wall may look even more like a wall of speakers now, but the improvement is worth it. The second major insight has to do with bass room gain. It might be expected that putting a speaker like the Heritage Jubilee in a small room corner might lead to some pretty large room gain. I could hear such a gain when I was close to the corners. However, I thought I was spared this at the MLP since I didn’t hear that when listening there. Well, it turns out that I just hadn’t put on the right program material yet. One day, I decided to listen to some tracks from the Lord of the Rings soundtrack. The deep organ bass on this was so overblown that I couldn’t continue listening. The measurements I made for the positioning issue showed my why. While there was some room gain in the mid-bass at the MLP, most of that gain was below 30 Hz, peaking in the mid 20’s. Only the sustained low bass the LOTR soundtrack made this obvious at the listening position. Luckily, the processor that I am using in the Jubilee system, the Emotiva XMC-1, has two equalization presets that allow up to 11 PEQs to be defined per speaker per preset. REW was used to determine two PEQs per channel that were enough to tame this at the MLP in my room. This very low bass room gain was quite large. The largest peak required more than a 10 dB cut to correct. So, if you are going to have Heritage Jubilee in a smaller room, you will need some way to do bass room correction. It’s unfortunately that Klipsch does not allow the end user to adjust the DSP in any way (apart from the gain knobs that allow different amplifiers to be used with the LF and HF which wouldn’t help with this). This would be a good way to do such correction. Now that I have the speaker position and room dialed in, the Jubilee sound better than ever. The response at the MLP goes out to 20 kHz close to spec and the -3 dB point for the bass is about 16 Hz. I even get useable response (-10 dB) down to about 10 - 12 Hz (depending on which channel is measured since the room isn't quite symmetrical). These speakers have not been over hyped. They are the real deal. Last week I went to a concert at Lehigh University featuring the Lehigh University Orchestra and Choir. (My son sings bass in the Choir.) It was another opportunity to hear what a live, unamplified orchestra and chorus sounds like. I have to say that of all the speakers I’ve owned over the years, only the Jubilee seems to successfully reproduce the detail, dynamics, and sheer power of a live orchestra and chorus. One other thing the Jubilee do best is producing the “performer in the room” tangibility, that feeling that you could reach out and touch the performer. A few days ago, I purchased a used CD at a thrift shot of the Persuasions, a “doo-***” a cappella group, doing covers of U2 songs. While it’s not something I would normally buy, I was mainly interested in the recording as demo/test material. It was done by the audiophile label Chesky Records and was recorded direct to digital (no overdubs or remixing) in a Manhattan church. The imaging of the semicircle of the singers with this recording is amazingly precise and realistic. The “reach out and touch” feeling is astounding, as is everything else with these speakers. After three months of owning the Jubilee, I have no regrets. 11 Quote Link to comment Share on other sites More sharing options...
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