pcbiz

A solid state rectifier for your ST70 amp would be perfect for him.

Welcome to the forum! I purchased a Heresy and Chorus II pair before I got my La Scalas. So when I began modding my vintage La Scalas, I had a little more experience, and went straight to the high quality stuff. If you followed the same simple mods I made initially, your results would be more dramatic, as you have a substantially more advanced audio setup than I started with. You can follow my La Scala upgrades here:

I tried changing the midrange settings for the ALK-450, but I put the Volte crossovers back in. They're just right. I'm sure I'll experiment with the ALK-450s again and/or use them for another project. I also threw a new amp into the mix. A local engineer built this for about $700 in parts and labor. I already had the KT-150s and the rectifier tube from a guitar amp. He had already started when I realized I wanted mono blocks.... so this is how amp accumulation starts. My MP-301 is now used for headphones.

Well said! I just got the GR Research power cable; $287 for five feet. It sounds deep, robust and dynamic, which is exactly how it looks. Kinda funny. So far, the GR Research cable is just a cut above the $90 cables I bought from a local electrical engineer, which are really great as well. Per Gary's advice, I'll run his cable for about 100 hours to hear its full potential. If you could post a link to your Chinese high end cables, that would be very helpful.

Hmmm.... I'll try that. To be fair, I adjusted the Volte crossover levels to taste. We shall see.

That's definitely a better idea. Thanks.

I received my ALK-450 crossovers and my Eliptrac 400 kit a week apart. The last of the ALK crossovers, and the last of the Eliptrac kits. So far I've installed the ALK-450s for comparison with my Volte VTK 400 crossovers. My first observation was that the ALKs gave the tweeters a bit more push, which was pleasant. However, the Volte crossovers are better at distinguishing between each instrument, the vocals are more present and engaging, and the bass is well defined and balanced. Drums and percussion are more detailed as well. The Volte's are also twice the price of the ALK-450s. The next experiment will be with my Eliptrac 400 kit. I initially thought about cutting the new horns into my La Scala cabinets. However, a better option would be to create a separate cabinet for the Eliptrac horn, and a separate cabinet or holder for Beyma CP-25 Tweeters. The drivers would also be a nice fit for hot rodded vintage Klipschorns.... maybe later.

I separated the 10awg into two strands on the end. The half strands fit the terminal holes perfectly. You can cut or twist the excess.

I'm using this for lightning protection. Absolutely necessary around here. https://www.amazon.com/AC-Power-Filter-Conditioner-Protector/dp/B00XWL2VVK/

https://norfolk.craigslist.org/ele/d/yorktown-klipsch-model-heresy-ii/7480892651.html

Wow... that was pretty fast. The used market prices are getting back down to normal. Crazy inflation tends to do that.

https://www.facebook.com/marketplace/item/747299459761190/

I took a similar approach with my Heresys, but I purchased the ALK Universal crossovers, as I have no crossover design skills. Changing out the wiring to 10AWG and upgrading with new SMAHL tweeters were big improvements with my newly capped stock crossovers. However, upgrading to the ALK crossovers was a substantially larger and very engaging upgrade in sonics.

Only when the EL34s are in a better amp than my MP-301. In the same amp, the KT150 always outshines the EL34 in a big way. I haven't done a live KT150 vs 300b comparison yet. However, I have also listened to a KT120 vs 300b comparison on Youtube. I couldn't tell the difference through my setup. I'm assuming the difference would be more noticeable with KT150s.

If you heard that, then your assessment is 100% correct. My first and current tube amp is the MP-301 Mark III. It had a great sound with 6L6 and EL34 tubes. However, it really came to life with KT150s. Your observations of KT150s are pretty much the same as mine. I'm getting Quicksilver mono blocks to better accommodate that KT150 sound.

The K-55V will definitely work on the Heresy 700 Hz horn. That's what I had in mine. Crites sells them as the Atlas PD-5VH Alnico Midrange driver. $365/pair. I also got a nice boost in presence, detail and volume from my K-55Vs by swapping out the steel crossover to driver wiring with 10AWG pure copper wire. It actually improved every driver in perfect sonic proportion. Give it a try if you'd like, and share the before and after measurements if you can.

Good work. Materials definitely make a sonic difference. I changed the tin terminals on my 'crossover to driver' connectors with copper terminals for my vintage La Scalas. The sonic upgrade was pleasantly surprising. I need to start taking measurements like yours so I can quantify these experiments.

My Chorus II risers were pretty beat. I replaced them with modern Klipsch solid risers. They actually tightened up the bass very nicely.

Maybe not. Try it and see. As far as paying, you and the seller probably both have Zelle in your bank accounts. It's fast and free. I used it to buy my La Scalas at $600, and they are a work in progress.

Ad title says $600, the actual ad says $800. https://washingtondc.craigslist.org/mld/ele/d/bethesda-klipsch-forte-ii/7480220695.html

For my Heresy I and Chorus II pairs, damping material on the mid horns made a substantial difference for the better. For my La Scalas, not as much. However, when I used the Dynamat brand for damping my La Scalas, the difference was substantial. The off brand I used for my Heresy and Chorus speakers was too thin to make a difference in my La Scala mid horns.

Sorry, I don't have any measuring devices, but I'm sure someone else doing the mod has.

Wow! Never thought about two layers of damping; I've always used one. I think I'll try that on my vintage La Scalas.

Some China amp distributors have inventory in the US. Click around Amazon to see what you can find.

The wait is about six weeks. I definitely prefer the new QuickSilver designs. A DAC with a volume knob would work, but you would probably prefer a preamp if you did an A/B test.