Deang

It’s an AL-3. Using your fully functioning La Scala, loosen the two screws for the tweeter and remove the tweeter connections. Now connect your non working tweeter to those connection points on the barrier strip. Play some music. If you hear the tweeter the other network has an issue.

Seller was confused. Those are AL-3’s. HIE is basically a Heresy tapped out like an AA, and uses an 8uF instead of a 13uF.

AL-3

It’s the right choice because of the drivers you are running. If you want the sound to be a bit more crisp and detailed - replace those 40 year old capacitors. Be sure to use their modern factory equivalents.

Nice job. Sounding pretty good I would imagine.

It’s always a crossover issue.

I read through this entire thread, only to find that no one knows the answer, which is 1 Hz. 🙂

I don’t remember that measurement but I do remember my personal experience. After changing out the diaphragms in my two port phase plug K-55-V’s, I had a hard time pinning down if I was really hearing a difference or just thought I was hearing a difference. Speaking of the A-55-G, if you have version one, someone should have told you by now that the diaphragms for version two will not work in it (and I presume vice versa).

I’ve been thinking about this statement for a few days and how to respond to it. I appreciate opinions from people about what they hear, but since everyone hears differently, opinions are largely subjective. I didn’t think you were lying to me, but I now tend to take everything with the proverbial grain of salt. I have issues with measurements too. Not everyone measures the same and they are usually done in listening areas. How much is the speaker and how much is the room? Microphone placement also varies, and most are not very forthcoming about their test set ups. I also take issue with the fact that Klipsch isn’t very forthcoming with data. We are all left to scramble, trying to figure out the right way to do a thing with very little input from the professionals who should be providing guidance. It’s like being on a treasure hunt, and the captain has made off with the map. I think it’s sad that someone like you has to track down somebody from Atlas engineering to get an answer about why the new driver is different. By the way, have you put a new diaphragm in an old driver and curved it? I’ve gone over the Klipsch update sheets you provided me several times. I have very little confidence in what I’m reading. It doesn’t add up. I have found a satisfactory answer, but you won’t like it. Yeah, I’m cranky.

About 15 years when they were released. Just don’t know if it’s reasonable to expect a loudspeaker company to keep spare parts indefinitely for discontinued product. It’s very possible that the manufacturer of that tweeter either still makes or the model that replaced it.

One hits 6kHz, the other one doesn’t. I’m in distress. Could someone DoorDash a pizza for me?

Actually a “Belle Klipsch”. “K-500” stamped right on the horn.

There is a very long Plane Wave Tube mounted above the chamber in Hope (or was it Indy). One can presume that PK probably used it at least once or twice. 🙂

Good post.

Hi Jim, Sounds like you are just saying the current version of the PD5-VH can’t play as high as the older single phase plug versions. However, their current data sheet is exactly the same as the one that they’ve been using for as long as I can remember. At any rate, I have no reason to doubt your word. It’s interesting. As for the collapsing verticals - if that’s not true, then Klipsch misinformed me. Person shall remain anonymous unless they prefer to reveal themselves and clarify. There is always the possibility I misunderstood.

@OO1 Please explain this set up.

“K-55-M hotter”. That was addressed in a very long thread that eventually got moved into the historical section. That myth was busted by John Allen, and I confirmed it with Jim Hunter. Only the engineering samples were hotter, when the production samples arrived, they were the same sensitivity as the K-55-V. That doesn’t mean the frequency response was identical. People get confused by this. You can have variations in frequency response, but still have the same sensitivity. This is why it is important to use the right driver with the right network. This was also confirmed with Jim Hunter and Roy. Mike Boxler was kind enough to confirm all of this with measurements because he was tired of watching me agonize over it.

The old K-55-V reached 6kHz because of the collapsing verticals of the K-400 horn. Like Mike pointed out, it’s doing it, but it’s not happy about it. This is the primary reason Roy lowered the crossover point. The driver is beaming, and not providing a smooth power response (polars aren’t lining up). On the Atlas spec sheet for the PD5-VH, they tell you that the frequency response was taken using a plane wave tube, not on a horn - and that if you want to know what the driver is doing, you need to put it on the horn of your choice and measure it.

In that plot, the single port phase plug version is in red. It’s “hotter” than the K-55-M, which is in blue. This is the opposite of what you claimed. Do you have an explanation?

Bad idea. Wrong network for the drivers he is using. You have been told this at least a half dozen times. Also, JEM “has no missing parts”, only I do. I think I am done with this nonsense along with everything else that has come with it. @Chief bonehead Please remove me as a Klipsch Authorized builder.

I think you need to feed him while you’re teaching him. Hard to learn anything when you’re stomach is empty.

They look fine to me. Definitely not “HIE”.

AL-3

Just realized normal people can’t afford my stuff either, lol.

Normal people can’t afford that stuff.