Yeah, that's where it ended up after I got done messing with it. It's probably better up as high as it can go anyway, less work for your tweeter 🙂
I'm still gonna try your X-over, the tweeter will be mounted about a 1/4 inch from the woofer which gives me a 4.25 inch C-T-C spacing ! I would probably bet not all designs follow the spacing rule to the letter anyway. Your response graph looks to good to not give it a shot, and the X-over parts count is low. I have some 0.6mh coils, once I can get my hands on some 0.06mh coils and wire them in series she will be a go ! Thank-you for all your work, I,ll let you know my progress when all the parts arrive and I get them built.
I think I got it now ! So would it be safe to say a C-T-C spacing based on the above graph could be about 8 inches or less ? If so DrDyna please forgive my ignorance !
This is still some of the stuff I'm learning myself. If it's 1/4 wavelength at that crossover point, that would make it a little more than half an inch I think, which would be very difficult.
I'd probably settle for "as close as possible."
You could always give this a look but beware, your brain might hurt. Mine did after about 5 minutes.
Ouch ! "I knew I should have learned Greek" From what I don't understand C-T-C spacing has something to do with baffle step correction ect....
Last edited:
It was that article that really lit some things up for me re MTMs.
Most cone/dome speakers are compromised wrt driver spacing and my calculation was intended to exemplify that. The less than optimal CTC are what cause lobing, and to a lesser extent the flare in the dispersion at the bottom of the tweeter passband.
dave
Like I said its all Greek to me ! I tend to read alot and absorb little ! Thanks for clearing things up !
I found this looks like a good tool, and some interesting reading as well ! Link > Driver Offset Calculator
As long as your xover is below the CTC corresponding wavelength, you are okay.
I understand that P10 is saying you avoid the lobing issues entirely when using a 1/4 lambda CTC, but we just can't accomplish that most of the time.
13560/CTC = highest xover frequency recommended.
Some optimization criteria... and some tips... - Techtalk Speaker Building, Audio, Video, and Electronics Customer Discussion Forum From Parts-Express.com
Later,
Wolf
I understand that P10 is saying you avoid the lobing issues entirely when using a 1/4 lambda CTC, but we just can't accomplish that most of the time.
13560/CTC = highest xover frequency recommended.
Some optimization criteria... and some tips... - Techtalk Speaker Building, Audio, Video, and Electronics Customer Discussion Forum From Parts-Express.com
Later,
Wolf
http://www.diyaudio.com/forums/css/176790-el166-mtm-ml-tl.html
3+ octaves from the woofers, 6+ from the mid-tweeter.
dave
3+ octaves from the woofers, 6+ from the mid-tweeter.
dave
That's what I thought. I was referencing for a typical midbass-tweeter arrangement- it's not possible for most of those type of applications.
Later,
Wolf
Later,
Wolf
I found it !
Trying to explain the C-T-C spacing thing, here is the chart I had been talking about ! Link > Techtalk Speaker Building, Audio, Video, and Electronics Customer Discussion Forum From Parts-Express.com - View Single Post - 2 way or 2.5 way MMTMM?
Trying to explain the C-T-C spacing thing, here is the chart I had been talking about ! Link > Techtalk Speaker Building, Audio, Video, and Electronics Customer Discussion Forum From Parts-Express.com - View Single Post - 2 way or 2.5 way MMTMM?
Tang Band W4-1720/Series X-over
Once again I managed to get off topic. Could someone respond to this thread before it gets lost in the archives ? What I would like to do is construct a 2-way using the TB 1720 with a SB Acoustics tweeter, here is the data > http://www.solen.ca/pdf/sb/sb25stncc0004.pdf Any help would greatly appreciated ! Thank-you
Once again I managed to get off topic. Could someone respond to this thread before it gets lost in the archives ? What I would like to do is construct a 2-way using the TB 1720 with a SB Acoustics tweeter, here is the data > http://www.solen.ca/pdf/sb/sb25stncc0004.pdf Any help would greatly appreciated ! Thank-you
- Status
- Not open for further replies.