1) Why would you use a horn with a curved wall? This results in a "horn sound". This especially includes any Oris horn, unless you are going 4- or 5-way to avoid the problem, of course introducing problems in the process.
2) Why would you ascribe direct radiating drivers (woofers) the most important portion of the loudspeaker design: bass frequencies...where you can hear all the harmonic distortion and modulation distortion products, as well as compression distortion? Why not La Scala, Belle, or quarter pie bass bins (if have personal or WAF issues with size), or Khorn/Jubilee horn-loaded bass bins (for those that have more room to do a better job). They have much lower modulation distortion--which determines the "cleanness" of sound and dynamic range that you'll likely want for rock--n-roll and pop, up to A440 tuning fork frequencies.
I'd recommend rectangular conical horn profiles of 90 x 60 degree coverage angles with mouth flares, and horn-loaded midbass or bass bins if your decision criterion actually is (and is limited to...) your stated one.
A pair of K-402s (which are big) (American Cinema Equipment [Cinequip]) would be either $600 (horns only), or $2400 (horns with adjustable bases and K-69-A drivers). I recommend horns only if using a K-402 to save a lot of money. I assume that you can fabricate a base to hold onto the throat of the horn That leaves you $2400.
You'll need a good crossover - you can use passive, active-analog, or active-digital. All have their advantages and disadvantages. You'll have to do EQing since the K-510 and the K-402 are "constant coverage" horns.
Okay, so you really, really don't want horn-loaded bass bins, then I'd recommend the Crites Cornscala cabinets, which are a bit nicer sounding than Cornwall bass bins. Bob would probably make you a deal on those.
I dont get into the tech side as Chris does, I can tell you I have owned 4 and heard another 4 oris horn setups and they are SUPERB when dialed in with the right gear, Nothing Klipsch offers up to & including the khorn can touch them IMHO (I have not heard the jubilee so cant comment) The oris truly need to be Bi or Tri amp'ed to sing
for your current gear I would go along with chris and look at the cornscala, lascala. k-horns (I would not consider the belle unless looks are an issue, when I had the belle they were nice but sounded no better than lascala)
Thanks everyone I was really thinking on getting a pair of the KPT-Jubilee/535-B since finding one in the used market is impossible, I have heard both Lascala and cornscala and lascala lacks thight and power at the bottom end. Thats the reason that Bob Crites created the cornsala (the mid of lascala and the bass of the cornwall, Please educate me why you guys love so much the bass horns.
[Comment: Higher-order modulation distortion products, both positive and negative on the higher frequency dual-tone, will be much more objectionable to the human hearing system due to the phenomenon known as "masking". This means that horn-loaded bass bins will have a 18-20+ dB lower level of audible modulation distortion spikes on either side of the higher dual-tone frequency.]
For me, it's one of the critical few differences between real hi-fi and everything else. Vented boxes (bass reflex) have never sounded real to me - and is always very sloppy to my ears and opaque (i.e., modulation distortion abounds), even if the radiating area of the woofers equals or surpasses the mouth area of the horn-loaded bass bin.
I'd be willing to discuss the differences between K-402s/K-510s and other horns, but probably not in this thread: this thread is supposed to be about recommending loudspeaker configurations for the OP.
After playing mix match with drivers and horns with a budget set of K-horns I have a different take now. I bought these things stock and figured I would be satisfied and never have to look at speakers again. After dropping a little over 3K in them for BMS drivers, V-trac mid horns, Beyma tweeters and some very upscale, great sounding Jupiter flat stack X-overs from Dean, I had the opportunity to hear Mr. Crites Jubilee's. Well as great as my K's sound, they don't have the spacious, effortless sound of Jubilees. If possible, save your money. The Jubs with the 402's are worth the wait and the extra dough and then some.
I have heard Bobs' jubilee's also. They are the best sounding speaker I had ever heard!! I new I could never afford a pair, so I built some jamborees. I have a bass now that is very close to the jubilee, but that horn on top, I wished I had a pair. The horn and driver they use is just magic to my ears, buy them you will not regret it!!!!!
Trucks like these were everywhere in India. The drivers had a lot of pride in their vehicles, painting them like you see here. Use of the horn was compulsory so you can imagine the noise pollution this caused. Horns and flashing lights (at night, hence reference to the 'dipper') were how the drivers communicated with each other, especially when passing.
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