I have 2 pair of WR125ST's to recycle from an earlier project. (Fatally low WAF!)
Is it feasible to mount them together (flat-to-flat) in a BIB?
What adjusted values should I enter into the BIB calculator if I wanted to do this?
I'm assuming that the calculated "z" would actually be the centreline ie where frame touches frame.
Note that a helper tweeter or supertweeter would be needed. I'm just assuming that that's not a big issue once the basics are sorted.
Can anyone assist? For that matter, has anyone tried this?
Thanks
Doug
Is it feasible to mount them together (flat-to-flat) in a BIB?
What adjusted values should I enter into the BIB calculator if I wanted to do this?
I'm assuming that the calculated "z" would actually be the centreline ie where frame touches frame.
Note that a helper tweeter or supertweeter would be needed. I'm just assuming that that's not a big issue once the basics are sorted.
Can anyone assist? For that matter, has anyone tried this?
Thanks
Doug
Driver orientation?
OK. Thanks Scotmoose.
Next question ... Is it better to orient the pair side-by-side or under-and-over?
Side by side would mean, I think, that the actual line length would be the calculated value, but the under and over arrangement would perhaps "smear" the positioning?
Would this "smearing" be detrimental? Or perhaps beneficial, if the FR response was smoother?
cheers
Doug
OK. Thanks Scotmoose.
Next question ... Is it better to orient the pair side-by-side or under-and-over?
Side by side would mean, I think, that the actual line length would be the calculated value, but the under and over arrangement would perhaps "smear" the positioning?
Would this "smearing" be detrimental? Or perhaps beneficial, if the FR response was smoother?
cheers
Doug
Assuming you can get away with it, yes (although our critical hearing BW is 200Hz - 4KHz &, preferably an octave either side 
). MTM should help a little with that, although nominally you're destrutive interference is going to start from the point at which the c-to-c spacing of the drivers exceeds 1 wavelength.
). MTM should help a little with that, although nominally you're destrutive interference is going to start from the point at which the c-to-c spacing of the drivers exceeds 1 wavelength.
Hi Brisso,
Scott designed a double horn box for the two WR's as well. Something to consider and it's an easy build. It's called the Calhoun. I would recommend running the drivers as I have to remove any problem with combing and to act as a BSC. You have to squeeze every ounce of goodness from those drivers so I chose that route. I am not disappointed.
Scott designed a double horn box for the two WR's as well. Something to consider and it's an easy build. It's called the Calhoun. I would recommend running the drivers as I have to remove any problem with combing and to act as a BSC. You have to squeeze every ounce of goodness from those drivers so I chose that route. I am not disappointed.
Attachments
Yes it's a TB similar to this one but with a heatsink added to the magnet.
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=264-804
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=264-804
Alternate tweeter?
How about this Visaton unit?
www.soundlabsgroup.com.au/p/V-9002-TW70/TW+70+-+8+Ohm
Doug
Cal Weldon said:
How about this Visaton unit?
www.soundlabsgroup.com.au/p/V-9002-TW70/TW+70+-+8+Ohm
Doug
One likes the high power handling and relatively flat impedance curve. On the other hand, that Fs peaking is brutal. Should be easily controlled in XO tho since the impedance spike is negligible.
I've been thinking about picking up some of the old alnico cone tweeters they have at the local TV repair shop for a little testing.
I've been thinking about picking up some of the old alnico cone tweeters they have at the local TV repair shop for a little testing.
I would be interested in how two drivers compare to a single 8 inch driver. If the new TB is very good and much less than the Seas, perhaps we will find out.
I'm still inclined to believe that a bigger sound is best produced by keeping a single driver as a broad midrange. Maybe the first reflection from the side firing driver is a problem in a typical home setup. That it arrives too close in time to the front firing driver and in the same ear as the direct sound. In addition, trying to understand the off axis performance of a system with right angles drivers is difficult for me.
I do think the front/back is easier to understand, especially with OB. Perhaps the best way to put a bigger bottom on FR drives is the OB design of front/back woofers with the back firing woofer out of phase.
The only design I ever liked from "the one whose name shall not be spoken" (bose) fired higher frequencies that need to bounce twice before being heard (bose 601). It seems like that setup of backward firing guarantees the reflection arrives late enough to be perceived as room ambiance.
We don't really need more drivers for bigger sound, do we? I seems to me we need more reflections arriving late enough and close to the ideal phase.
I'm still inclined to believe that a bigger sound is best produced by keeping a single driver as a broad midrange. Maybe the first reflection from the side firing driver is a problem in a typical home setup. That it arrives too close in time to the front firing driver and in the same ear as the direct sound. In addition, trying to understand the off axis performance of a system with right angles drivers is difficult for me.
I do think the front/back is easier to understand, especially with OB. Perhaps the best way to put a bigger bottom on FR drives is the OB design of front/back woofers with the back firing woofer out of phase.
The only design I ever liked from "the one whose name shall not be spoken" (bose) fired higher frequencies that need to bounce twice before being heard (bose 601). It seems like that setup of backward firing guarantees the reflection arrives late enough to be perceived as room ambiance.
We don't really need more drivers for bigger sound, do we? I seems to me we need more reflections arriving late enough and close to the ideal phase.
Calhoun's bigger sibling???
Here's a thought experiment ...
"I thought the vacuum cleaner looked a bit tentative ..."
(Vivian - "The Young Ones)
See www.occamaudio.com/free.html
ie 2 x CSS SDX7's and a Wavcore tweeter
Is it feasible to resize the (side-firing) Calhoun box to utilise the above drivers?
Doug
PS Can I put in an early bid that such a box be dubbed the "Nelson"?
*Oz readers would know of HG Nelson "... when too much <...> is barely enough!"
Here's a thought experiment ...
"I thought the vacuum cleaner looked a bit tentative ..."
(Vivian - "The Young Ones)
See www.occamaudio.com/free.html
ie 2 x CSS SDX7's and a Wavcore tweeter
Is it feasible to resize the (side-firing) Calhoun box to utilise the above drivers?
Doug
PS Can I put in an early bid that such a box be dubbed the "Nelson"?
*Oz readers would know of HG Nelson "... when too much <...> is barely enough!"
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.