Invidiosulus
Well-Known Member
I’m using a crossover with a .25mH coil on the mids and it sounds great.
Three-Way Horn System w/ PRV D2200Ph Midrange & ZXPC 18x10 Horn
- Thread starter THD+N
- Start date
Invidiosulus
Well-Known Member
I think one of the main issues people thought they had with the GRS K33 was the low FS coupled with the higher Qes resulting in a higher mass roll off frequency which should translate to weaker midrange on the bass horn.
I’m pretty sure I’ve seen TS parameters pulled from vintage K33’s that were similarly “bad” so the performance might be similar in a Khorn or LS but it might not be mathematically ideal.
I’m pretty sure I’ve seen TS parameters pulled from vintage K33’s that were similarly “bad” so the performance might be similar in a Khorn or LS but it might not be mathematically ideal.
lissenup
Super Member
I’m confused by this. I thought the wire from the #3 tap goes to the negative of the mid in a B-2 crossover. Are you saying to change that so #3 tap goes to positive of the PRV?
Just follow my B2 schematic I posted and pay attention to the connections to the drivers.
Not sure how much the autoformer affects the phase. For some reason, I lack the curiousity going on with it and just use it.
I found one of these on eBay that I am going to modify into the 40Hz EQ/infra-sonic filter for a ported LaScala. It was cheap; $25. You can't buy a transformer and enclosure for that. Anyway, my thought is to send it to members who have ported their LaScala's to see if they want to make the most of the port mod. I'll document the phono EQ mod, if anyone wants to tackle it themselves.
Invidiosulus
Well-Known Member
That looks like a great option.
If you get a guide worked up I’ll build one.
It can’t be any harder than modding guitar pedals.
About the same skill level.
lissenup
Super Member
Just out of curiosity, are you suggesting this schematic if using the K55 (without the .25mH choke) as a standard B-2 crossover?
No. Only for the D2200Ph.
lissenup
Super Member
Thanks.
What speaker is the B2 for? A Cornscala?
yeah, I was going to start off with a B-2, but after listening to a converted B xover(from an old E); I'm putting together something very similiar to a B-2 in form; but with a 68uf cap parallel to the woofer, using either 6uf or 7uf cap to the autoformer, most likely 6uf to not push the PRV too low and possibly effect it's performance on it's higher end. And then use a 4uf cap on the tweeter (I'll be using a DE-10 or most likely the 120 in a smahl lense since they can cross lower than a k-77. As far as the inductor for the mid I've got .500mh and .245mh to try out....Bob Crites initially suggested such during his Cornscala 2 experiments.
my question about the inductor for the mid driver and crossover as a whole, is regarding the DCR instead of millihenry value.....I've read so much about improving these earlier heritage models that it all blurs together sometimes, but I wanna say if using a B or classic Klipsch xover with modifications to taste, of course, that one should use an inductor with DCR values around 0.3 ohms??? The reason I'm curious is because I looked at my air cores last night and parts express sent me my ,245mH inductors with a thicker winding, like damn 14guage.... and Rdc of 0.11ohms? Anyone with more experience know how that's going to effect the results? I didn't notice until I was going to A/B the different inductors last night and I'd hate to count out the .245 like what was suggested to me earlier in this thread.
Thankfully, my new listening chair arrived last night so I got distracted and avoided all tweaking frustrations putting it together. FWIW, it may not be a name brand Henry Miller Eames chair, and definitely not last for decades, but I've wanted one of them ever since my only other audiophile friend from college inherited a 1st series original and forced me to sit in it as I was totally ignorant....yeah, it may....or is definitely such a cliche to have one, but the day my franken cornscalas played music the 1st time, I somehow won an open box Ebay auction that I had forgotten about as I just placed the initial bid and figured it was impossible I'd win. Much like me almost randomly buying the PRV driver in the 1st place and it somehow impossibly ended up interchangeable with my K55 driver....and I have the dual phase plug variant that's desired by most. I myself am thrilled. I may sell my K55s while they are deemed valuable now. I understand keeping official klipsch parts for reversions/potential resales etc. I could care less. Maybe if it involved selling some heresies down the road, but I'll never sell these speakers.
Sorry for the long post, but lastly, can anyone share some quick links of comparison measurements between the official drivers in the top hat of the La Scala vs the PRV and zxpc horn with B&C 120 with Smahl? I've tried to search for a friend, I know they are better....but in the vein of this thread, my friend believes it's too good to be true. Even with the simplification of a dramatically larger horn and a 2inch vs 1 inch driver that inherently should produce 4 times less distortion , both harmonic and intermodulation variety, all things equal.
I wonder how long PRVs pricing will remain at such a bargain (zxpc, too)....heck I was considering laser printing to forking up for a joseph crowe designed horn at one point. It's an awesome relevation that options exist for those who want such large quality speakers. I thought I'd never be able to afford a set until the age wherein I couldn't hear well anymore. Much less, build something better than stock by myself. It's one thing to repair gear, but building speakers of this quality, regardless if they are even clones or not, on my 1st attempt isn't supposed to be possible without voodoo from selling your soul. Between the physics, woodworking, luck, and xover voodoo...I feel like I've accidentally made a work of art. But yeah, I need to find links of measurements, as I'd like to build a set for a couple people who can't buy Klipsch off the shelf (or their wives won't let em) and need to save measurements to help decide on my final xover and to just show them that they can own better speakers and give them a project they can build with their sons. Even if measurements were worse, nothing rivals the pride of a large project, but I can push 2 people over the ledge into big horn speakers, by showing them on paper. Unfortunately, that's needed these days since there aren't any stores to even listen to new cornwalls, belles, K-horns, etc.
my question about the inductor for the mid driver and crossover as a whole, is regarding the DCR instead of millihenry value.....I've read so much about improving these earlier heritage models that it all blurs together sometimes, but I wanna say if using a B or classic Klipsch xover with modifications to taste, of course, that one should use an inductor with DCR values around 0.3 ohms??? The reason I'm curious is because I looked at my air cores last night and parts express sent me my ,245mH inductors with a thicker winding, like damn 14guage.... and Rdc of 0.11ohms? Anyone with more experience know how that's going to effect the results? I didn't notice until I was going to A/B the different inductors last night and I'd hate to count out the .245 like what was suggested to me earlier in this thread.
Thankfully, my new listening chair arrived last night so I got distracted and avoided all tweaking frustrations putting it together. FWIW, it may not be a name brand Henry Miller Eames chair, and definitely not last for decades, but I've wanted one of them ever since my only other audiophile friend from college inherited a 1st series original and forced me to sit in it as I was totally ignorant....yeah, it may....or is definitely such a cliche to have one, but the day my franken cornscalas played music the 1st time, I somehow won an open box Ebay auction that I had forgotten about as I just placed the initial bid and figured it was impossible I'd win. Much like me almost randomly buying the PRV driver in the 1st place and it somehow impossibly ended up interchangeable with my K55 driver....and I have the dual phase plug variant that's desired by most. I myself am thrilled. I may sell my K55s while they are deemed valuable now. I understand keeping official klipsch parts for reversions/potential resales etc. I could care less. Maybe if it involved selling some heresies down the road, but I'll never sell these speakers.
Sorry for the long post, but lastly, can anyone share some quick links of comparison measurements between the official drivers in the top hat of the La Scala vs the PRV and zxpc horn with B&C 120 with Smahl? I've tried to search for a friend, I know they are better....but in the vein of this thread, my friend believes it's too good to be true. Even with the simplification of a dramatically larger horn and a 2inch vs 1 inch driver that inherently should produce 4 times less distortion , both harmonic and intermodulation variety, all things equal.
I wonder how long PRVs pricing will remain at such a bargain (zxpc, too)....heck I was considering laser printing to forking up for a joseph crowe designed horn at one point. It's an awesome relevation that options exist for those who want such large quality speakers. I thought I'd never be able to afford a set until the age wherein I couldn't hear well anymore. Much less, build something better than stock by myself. It's one thing to repair gear, but building speakers of this quality, regardless if they are even clones or not, on my 1st attempt isn't supposed to be possible without voodoo from selling your soul. Between the physics, woodworking, luck, and xover voodoo...I feel like I've accidentally made a work of art. But yeah, I need to find links of measurements, as I'd like to build a set for a couple people who can't buy Klipsch off the shelf (or their wives won't let em) and need to save measurements to help decide on my final xover and to just show them that they can own better speakers and give them a project they can build with their sons. Even if measurements were worse, nothing rivals the pride of a large project, but I can push 2 people over the ledge into big horn speakers, by showing them on paper. Unfortunately, that's needed these days since there aren't any stores to even listen to new cornwalls, belles, K-horns, etc.
The DCR of the choke won't affect things too much depending on where the choke is in the circuit. The 0.245mH is the choke in question? You'll be putting this in series with the D2200Ph for a lowpass at 6kHz?
I don't have any B&C drivers or SMAHL's but below is the frequency response of my system with the PRV D2200Ph integrated into my ported LaScala. Don't mind the tweeter part of the curve above about 5200Hz... it was a K-77 that I experimenting with the crossover and dB setting.
As you can see the D2200Ph blends very well with the 400Hz crossover of the woofer.
PRV D2200Ph vs. K55V on 18x10 horn (red curve 2200Ph)
Last edited: