ClaudeJ1

On this I agree, but it's because of better DEVICES (IC's and Transistors) along with better circuit designs that create that difference. Sticking my original point about using 2 channels of a modern AVR works just fine with Klipsch Heritage. Room and positioning will make more sonic difference than believing older technology is better. YES, all of this is MEASUREABLE too, and not merely another unsubstantiated internet opinion in an echo chamber created by other people high on opinions with the typical 99.9% Opinion vs. 0.1 percent verifyable FACTS.

That should have read: "The difference you THINK your hear" is the real "difference." Many people have been humbled by a controlled listening session with an AB/X box. But you go on convincing yourself that your Quasi-religious experiences about amplifiers are technically or economically valid! To quote Paul W. Klipsch Himself: "BULLSHIT."

I was, and still am, learning to follow the expression: "Never argue with a fool, people might not know the difference." I just don't argue too much, and I DO know the difference!

Yes and "fun" is what people call out other people when they themselves have never designed an amplifier.

Great use of plywood. Perfectly cut.

Back in my days in Automotive Electronics, the micro code was written in Assembly Language because of ROM limitations. Assembly language is one level up from computer machine language. Programming in it is like trying to run a marathon on your kneecaps with no pads!! Now that memory is cheap and plentiful, is seem C+ or C++, or whatever derivation exists is the darling of the coders. It's memory capacity that allows for even inefficient/sloppy code to still work because hardware is so cheap. In 1996, I paid $500 for a full size PCMCIA drive, the size of a cigarette pack for my Kodak DCS-420 digital camera ($21,000 in today's money for only 1.5 BAD Megapixels). The drive had a whopping 100 Megabyte capacity, which was Amazing at the time as to how "small" it was. Now you can get 100,000 times that capacity in an SD card for 1/10th the price. So the price/memory ratio is 1 Million to one. That's what I call real progress!

We do have amazing tools to work with. I have a 1904 Zeiss catalog that talks about Planar an Tessar lenses. They are still being made today, with derivations, using newer glass formulas and a billion ray traces/second in simulation. I understood that it took over 2 YEARS to do the lens math by hand, so without modern tools, I think Roy would still only be working on Iteration #7 of the K-402, with 63 more to go before the "Eureka!" moment. All good things withstand the ultimate test: the test of TIME!

I think the udder is dry from all of us milking that one. We need a different sacrificial cow to discuss. How about the blending of passive networks' roll-off characteristic in conjunction with the acoustic roll-off of a horn coupled with different driver characteristics, including the impedance peak? Good start for the Chief or no??

Of course, new knowledge (whether read from the past, or created in the present), is never truly learned until it is applied and practiced!

That's what I get for not reading earlier responses before posting. I'm happy with 50%, but only half the time! HAH As to "Fitty Cent," I'd be happy with only half his money!

You're slowing down. You were a much quicker smarta$$ 8 years ago! HAH

I think I know exactly who you speak of. Michigan dude for sure.

It's possible. Meaning we have been around this industry for a while, aye?

I think I already named one of them. [E.G.] for example for example. Not a good impression 50 years ago with no improvement I could hear last time heard. Heavy on theory and math, light on personality and actually building stuff.

Dr. Earl Geddes is about 1/2 hour from me. His work on High Order Modes in horns deserves some credit. He's all about "waveguides" which, all horns are anyway, semantics. I heard him speak in 1976, after taking Mr. Klipsch's advice in his newsletters, and I joined the Audio Engineering Society. Met quite a few interesting characters here in Michigan. Like the SMWTMS engineers (David L. Clark and others) that invented the AB/X box. I was one of the first people to sit and listen with it, but I digress. Like PWK said: "a horn is a reasonably rigid air column. You just have to figure out what shape to make it."

I communicated with Dr. Floyd Tool about 3 years ago. He said Harman owns the patents on CBT's and let Don propagate the technology (probably needed the money). I read somewhere that Don officially retired, so I hope he's sipping fruity drinks on an island somewhere or playing golf, who knows. When I mentioned the JBL M2, this is what Toole said: "As far as horns are concerned, except for large sound reinforcement systems, the new JBL Pro M2 is state of the art in my experience. It is an exceptional performer - horn designed by Charles Sprinkle, then a consumer group engineer. I can detect no "horn" artifacts - a first." Having owned 3 pairs of Roy's K-402's in the last 10 years (still have a pair) I can detect Zero horn artifacts on that one either.

I had lunch with Don, back in 2014. We talked about his current designs mostly, but he did say that he could have designed some new horns for Klilpsch, but PWK wouldn't let him for some reason. IDK. As far as I know, it was John Pope's PHd thesis, with math and measurements done in the Hope Anechoic Chamber (exponential vs. Tractrix) using an EV DH-1a driver that convinced Paul that tractrix was better, which opened the door to Roy designing the first Tractrix horn for the Forte II and the Chorus II (which I owned for a while). There's a published article with smoke in the picture about it somewhere.

With an overly simplistic analysis of appearance only, it looks like a conical horn with a Tractrix Curve finish. A hybrid. If you read "What's so sacred about exponential horns" by Don Keele (who apparently did not get along well with PWK when he worked there). The idea of hybrids happened during his time at Electro Voice under Ray Newman's leadership. I have met all 4 of these gentlemen at on time or another since 1976 (also Saul Marantz as a 5th). Great evolution of the ART and science!

Great story of a great comeback with an Audio Vengeance!!

If sales of Stereo speaker systems had not been displaced by Apple Ear buds and the like, you'd have a different story to tell. Welcome to the reality of low sales to the young, who are the main buyers of music, as they were.

When you get your "Baby Cornwalls" finally done. Bring them to A/B with real Cornwalls for a surprise.

Dynamics are the key to a "live sounding" presentation. Higher efficiency means lower distortion and better dynamics. Hoffman's Law is still in effect, and horns are the most dynamic of all.

Don't worry, be happy. Ignore the internet noise/mostly BS about separate 2 channels. Just use your AVR as a 2 channel device. Modern electronics are better than the old stuff in every way. Besides, when you consider your "near future" Super Heresy's will only need about 1/2 Watt at sane listening levels (or any Heritage Klipsch for that matter), who needs lotsa watts anyhow. That's for the British branded "Space Heaters that make Sound" like B&W, which were totally STOMPED by my Super Heresys.

Somewhere between 40-60 Hz. Highpass. Let your ears, room, and bass tests be the judge. I gave you some wiggle room.

Also, since you saved over $100 on the woofers, you should put that money towards the Super Tweeters as a very important finishing touch to "complete the mod," as it were..............