2” K703 3D Printer help

Sorry for the delay - family vacation followed by a busy return. Bummer on the 2” not working out but I really appreciate the help. Is there any reason to think simply putting some new capacitors on the board and maybe even a new diaphragm on the k52s is all I’m chasing? I have the right caps for a klf30, the universal crossovers, and the old crossovers that came out.
 
DirtyErnie said:
It has the full K703 mounting flange, Drew it up to go into my CF2s. Not sure how much advantage the bigger aperture horns have above ~800. Might be possible to adapt a 1.4" driver to the K703 size mouth using OS techniques, but I think 2" is right out.

If MBoxler wants to have a look, pm me, I'll send it over.
Click to expand...
So are you saying you have a file with a k703 with a flat mounting flange? If so, that might be interesting for my Frankenstein lascala center channel.
 
ProHornResto said:
Sorry for the delay - family vacation followed by a busy return. Bummer on the 2” not working out but I really appreciate the help. Is there any reason to think simply putting some new capacitors on the board and maybe even a new diaphragm on the k52s is all I’m chasing? I have the right caps for a klf30, the universal crossovers, and the old crossovers that came out.
Click to expand...
New diaphragms for the k52 are an option. Have you tried attenuating your k52 less than the klf30 network using the crites universal?

Any thoughts about trying the forte iv mid driver? The iv uses the mumps version k-703m horn. Mid driver is a klipsch labeled Celestion CDX1-1748
 
Thanks for looking at it. My priority right now is a 14"w 1.4" throat version for some 2-way horns I'm trying to build for the living room. Although I did find the wireframe for this one when I went back through all the files.

but who am I kidding, My priority is surviving having a 3-month-old in the house.
 
Last edited:
Thank you all for the continued attempts. I would be game with trying the cele mid if it fits. I have experience with their tweeter on my lascala bodied center and like it a lot.
 
winglet said:
New diaphragms for the k52 are an option. Have you tried attenuating your k52 less than the klf30 network using the crites universal?

Any thoughts about trying the forte iv mid driver? The iv uses the mumps version k-703m horn. Mid driver is a klipsch labeled Celestion CDX1-1748
Click to expand...
Now that I’m looking, the CDX’s recommended low end is listed quite a bit higher than the crossover point, but Forte IV crosses 350hz below their recommendation. Looks like it extends to the moon too - why even use a tweeter
 
DirtyErnie said:
Thanks for looking at it. My priority right now is a 14"w 1.4" throat version for some 2-way horns I'm trying to build for the living room. Although I did find the wireframe for this one when I went back through all the files.

but who am I kidding, My priority is surviving having a 3-month-old in the house.
Click to expand...
If you would like I could run numbers through Bruce Edgar's Trachorn calculator to find out the Fc of the 14" horn. I assume you mean 14" mouth width. What is the mouth height? These horns are fairly easy to model in Fusion 360.
 
I think I used that calculator (or similar) to design it. I'll put those dimensions up later, if I get a chance to look at it.
 
From 'greg's tractrix calculator' spreadsheet. I used the round horn calc to start, manipulated a couple columns to make it elliptical.

Only about 1/3 of the horn is tractrix, towards the mouth.
EK

703-clone.PNG
 
Problem there is that a pure tractrix horn is too short to actually load down to the design frequency. For example, to get a horn that will cross above 400, you have to do the math for ~310 or something.
Wouldn't surprise me if the 575hz horn doesn't get below 700
 
My attempt to print a usable 1" Trachorn was unsuccessful. Instead, I thought I'd try to use a PRV WGP26-50 I had. It has a 2" throat.

I just got a single Chorus 2 to play with. The PRV horn fits nicely into the K-61-K opening, so I printed an adapter to mount the horn with a PRV D2200ph driver. Although it's an 8 ohm driver, I had a feeling the stock high pass would be pretty close since the D2200ph has a massive impedance peak around 600hz.

I measured the woofer earlier this week and measured the new mid horn combo this morning. It's not bad. Trying to deal with the 1khz dip with a newer version of the adapter.

I have a DE10 attached to my tweeter horn and will design a crossover for the speaker...some day. Not a fully 3D printed project but fun nonetheless.

Mike

thumbnail_IMG_0871.jpg

PRV Extension.jpg
 
mboxler said:
My attempt to print a usable 1" Trachorn was unsuccessful. Instead, I thought I'd try to use a PRV WGP26-50 I had. It has a 2" throat.

I just got a single Chorus 2 to play with. The PRV horn fits nicely into the K-61-K opening, so I printed an adapter to mount the horn with a PRV D2200ph driver. Although it's an 8 ohm driver, I had a feeling the stock high pass would be pretty close since the D2200ph has a massive impedance peak around 600hz.

I measured the woofer earlier this week and measured the new mid horn combo this morning. It's not bad. Trying to deal with the 1khz dip with a newer version of the adapter.

I have a DE10 attached to my tweeter horn and will design a crossover for the speaker...some day. Not a fully 3D printed project but fun nonetheless.

Mike

View attachment 3625652

View attachment 3625651
Click to expand...


I was 5 minutes from picking up the phone to special order a $200 pair of celestion 1757 mid drivers. I think I may try this first!
 
ProHornResto said:
I was 5 minutes from picking up the phone to special order a $200 pair of celestion 1757 mid drivers. I think I may try this first!
Click to expand...
I didn't realize that the mid and tweeter filters of the KLF30 and the Chorus 2 are almost identical. I'll try to design a daughter board that will connect to the stock crossover for the D2200ph. Are you planning on keeping the stock tweeter?
 
mboxler said:
I didn't realize that the mid and tweeter filters of the KLF30 and the Chorus 2 are almost identical. I'll try to design a daughter board that will connect to the stock crossover for the D2200ph. Are you planning on keeping the stock tweeter?
Click to expand...
I have crites universal in there now but I have the stock crossovers I can put new caps in and modify if that’s the move. (I liked the low frequencies on the stock crossover more)

I have the LMAHL with de10 in there now. I also have a tactrix lens with a de120 I really like. I go back and forth with them probably every 6 months/year.
 
You must log in or register to reply here.
Back
Top Bottom