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Old 4th May 2012, 11:42 PM   #201
GM is online now GM  United States
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Quote:
Originally Posted by gafhenderson View Post
.......i didn't want his old crap *manly tears*
Hopefully, they were grabbed by someone that could appreciate them.

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Old 5th May 2012, 02:05 AM   #202
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Originally Posted by gafhenderson View Post
like this?
Certainly something to try.

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Old 5th May 2012, 04:12 AM   #203
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Originally Posted by chrisb View Post
- for serious music listening, I'd probably want to properly XO them (circa 3500-4k?)
Good guess! In theory, for best overall on/off axis blend = ~3553 Hz using published specs.

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Old 5th May 2012, 05:01 AM   #204
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am i actually doing that whizzer trick properly? any other ideas to try?
The official trick is a slice of low desity foam on edge wedged between the edge of the whizzer & the cone.

Your FR curves are measuring the surface, but any benefit will show up on the bottom (20-50 dB down).

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Old 5th May 2012, 07:48 PM   #205
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Blimey,
Things have really moved on.
Interesting to see the graphs showing where the dips in response lay and the way cone treatment shifts things around.
Is the plugs lack of parallel section below the the cone / voice coil former causing issues?
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Old 5th May 2012, 09:33 PM   #206
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Originally Posted by gafhenderson View Post

its actually better in most respects than the standard bullet shape was. i got very little improvement from the conventional bullet shape and i had an hunch that the whizzer was just too big for it to work well. so i've flared it out at the end as i've seen in a few other classics of the full range world and the difference was very impressive.
The shape has me thinking of mounting a modified FT17 on the end of the phase plug (bolt thru the pole vent to hold it in place.

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Old 6th May 2012, 12:09 PM   #207
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Dual Concentric Eminence 12LTA? I know the tweeter is normally mounted on the same baffle as the 12LTA - I wonder if you could get it to fit at the same plane within the whizzer cone. 2 Questions:

1)Would there be time/phase issues with mounting a tweeter there?
2)Would the fact that the tweeter blocks most if not all of the whizzer's direct output be a problem?

I'll hold off letting the the FT17H into the baffle to see what you guys measure on the DC version

Will be playing with 'pluff' around the whizzer and maybe some packing noodles cut into wedges and then some polystyrene as its a bit firmer. I don't think that I'll be painting anything on the cones at the moment. Maybe enABL dots later
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Old 6th May 2012, 02:48 PM   #208
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1)Would there be time/phase issues with mounting a tweeter there?
2)Would the fact that the tweeter blocks most if not all of the whizzer's direct output be a problem?
1/ can't be worsr than fitting it on the baffle.
2/ one should be able to make a tweeter-plug of very similar shape to gaf's. One would start by dremeling off the flat mounting part of the plastic bezel.

For this ap, a very compact horn is required and the FT17 is the most suitable i have.

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Old 6th May 2012, 02:59 PM   #209
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With a fs of 5k guess you couldn't use the ft17 for the 3553hz GM suggested. What would the xover point be? Would the rule of twice fs apply? If so 10k?
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Old 6th May 2012, 05:02 PM   #210
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I'm not familiar with that tweeter, but what is the driver type? Compression or direct radiator? I looked up quickly and Fs is 2600hz. Probably can go close to it depending on filter and the tweeter.
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