Malcolm

Type C was used in Heresys with alnico woofer and K700 horn from the mid sixties into the mid seventies. Type D came around the time of the advent of the ferrite woofers, quickly replaced by Type E which simply incorporated a phase change. The E2 came toward the end of the run when the K55V was replaced. I don't think the Type B was ever meant to be used officially. But some unexpected combinations seem to have come out of Klipsch due to parts shortages or special requests.

IIRC the KV-2 was marketed as a center for the KG 3.5 in the late 90s. And IIRC the difference between a KV-2 and a KV-3 is slightly better low end response and efficiency.

The only down side would be if you are planning on using them with other Heresys. They don't sound exactly like earlier Heresys using the K55V. And they don't sound exactly like Heresy 2s. I had earlier Heresys for the front speakers in my HT system, and ones like yours for the back at one time. The difference was enough to be noticeable to me. I wound up replacing the rears with ones that matched the fronts. OTOH others have reported that they cannot hear a difference. So, it depends on you.

Uh, it clearly says KG4.5 on the label of one of them.

That is a funny question from a guy in a country that doesn't even produce a $1 bill any longer.

Yes, they blend seamlessly, as long as they are matched. Don't mix late Heresy with K-52K, or Heresy 2, with earlier ones. And yes, a good sub is necessary.

Goo Gone should not be a problem. It is mostly petroleum distillates.

Lemon oil furniture polish should remove it just fine if that is what you have. You could use mineral spirits, or even acetone. The finish has long since polymerized and is not likely to be affected by it. Use a soft cloth as recommended above. No need to use anything abrasive. FWIW lemon oil intended for furniture use is typically lemon scented mineral oil. And Goof Off products are made from a variety of things that have little resemblence to the oil from a lemon. It is all laid out in the MSDS.

No, you want your surrounds to be from the same series as the mains.IMHO unless you are a very uncritical listener, you will be disappointed by the difference in timbre.

EV 15WK would be original IIRC. That was a version of the 15W made to Klipsch specifications with the same impedance but lower resistance.

Us it two speakers, but only one serial number? If so, sounds like the second speaker is 1975 or earlier.

Red cloth surrounds were used on EV and CTS woofers used in earlier Heresys. I don't recall seeing a red surround in anything from the 80s, just black paper surrounds, but I guess anything is possible. Klipsch bought woofers from lots of sources. Other possibilites are that someone replaced the woofer with one used in an earlier Heresy, or one that was never used in a Heresy. Are there any numbers on the woofer? Got pictures or links? Are the surrounds cloth, paper or foam?

Looks like ash veneer to me. I have ash cabinets in my kitchen.

Sequential serial numbers don't mean a thing unless you are talking about matched veneers.

Stamped would be CTS. ALNICO standards for aluminum, nickle, cobalt, the magnetic material commonly used in the day.