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Multi-Way Conventional loudspeakers with crossovers

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Old 6th September 2016, 12:17 PM   #121
EarlK is offline EarlK  Canada
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Bill, I suspect that P.E. is preparing the way to carry the larger 44mm ( diaphragm sized driver ) by relieving itself of all inventory belonging to the 35mm ( sized driver ).

That ( sort of pre-emptive ) move would make sense if the final consumer cost isn't that great of an increase.

Power handling increases to 60 watts ( from 25 watts ) going to the 44mm size driver.
- One does need to consider the ( apparent ) fact that Tymphany aren't offering replacement diaphragms for these drivers ( effectively making them disposable items ).

( OTOH ), the smaller diaphragmed driver looks to be smoother in the FR ( according to the spec-sheets ) with a nicer impedance curve to boot.

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Old 9th September 2016, 02:26 AM   #122
bwaslo is offline bwaslo  United States
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But then the 60W version is rated at 3dB lower sensitivity, so net output increase is ~0.8 dB? Who knows what is going on with Tymphany.... I wrote them (no reply so far). I also wrote Parts Express (answered online that the one I designed with is discontinued and a new version is to come out 'soon', but no word on what exactly or how soon). Pretty discouraging, particularly since in this design I was specifically wanting to use available, still in-production drivers so I'd have something someone could actually build if they wanted. I guess I could still go back to the Celestion CDX1-1445, which wasn't bad sounding (though had more measurable distortion).

Anyway, here is a photo of the shelf ported cabinet still with bare unfinished wood. I finally got around to mounting things into it temporarily to adjust the port length.
Click the image to open in full size.
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Last edited by bwaslo; 9th September 2016 at 02:28 AM.
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Old 9th September 2016, 02:53 AM   #123
Patrick Bateman is online now Patrick Bateman  United States
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How hard would it be to adapt it for the Celestion you're using in the other Synergy Horn you've made?

That CD is still available I think?

I bought me a pair of BMS neodymium CDs, but was a bit bummed when I took them apart and realized there's a 90 degree bend in the design, that can't be good for HOMs.

The Celestion might be the best option for under $100
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Old 9th September 2016, 03:15 AM   #124
bwaslo is offline bwaslo  United States
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I was just looking at some of the crossover sims from earlier when I was using the Celestion still. It's not as smooth, and has a bit of a fight going down low enough, but not really bad.

It could be made to work, but it's hard to get enthused about taking all the driver design measurements again to get the delay exactly right, re-optimize for off-axis again, go outdoors for polars, all for something that won't be quite as good as what I already have. It's not like the world is falling all over itself to build up sets of these at the moment (only a few people have even heard them).
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Old 9th September 2016, 03:59 AM   #125
Pallas is offline Pallas  Pakistan
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That's really too bad about the CD. This is one I had bookmarked as something really cool I could actually construct (unlike other Synergy/Unity designs).

On a less depressing topic, are all of your measurements posted taken with the baffle recessed in the cabinet like that?
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Old 9th September 2016, 05:08 AM   #126
bwaslo is offline bwaslo  United States
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Quote:
On a less depressing topic, are all of your measurements posted taken with the baffle recessed in the cabinet like that?
Yes, but it's only recessed 1/4" (6.3mm), for grille foam. The shadows make it look deeper than it is.
It's a concession of appearance (for domestic living room) over performance. But, realistically, the waveguide pretty much keeps high frequencies away from the edge, and 1/4" is too small to do much down below 800Hz where the waveguide is losing directivity.
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Old 9th September 2016, 05:51 PM   #127
Eldam is offline Eldam  France
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We can hope the new Thymphany should be not too far in spec around the XOyou choosed... Best is too wait

Do you need a compression because the BL ? Is a SB acoustic 96 db sensivity tweeter strong enough to loose not too much directivity in this horn ? One can be crossed at 1500 Hz iirc. and if the horn is adding a little spl, their aluminium tweeter dome can be crossed relativly low seing the Troels Gravsen curves ! Now does it match to a horn like the Seos 15 is an other story !


this compression is not too expensive here but duno in your country : http://www.toutlehautparleur.com/med...a/CP380M-8.pdf : has certainly a sound signature not too far !
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Old 9th September 2016, 06:08 PM   #128
bwaslo is offline bwaslo  United States
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That Beyma looks very nice on it's data sheet, but it is quite expensive here (about $180 each). Still, might be worth it if Tymphany doesn't get its act together (which would mean I'd never design with any of their drivers again!).

I'm also going to try some DIYSoundGroup DNA360 for this. They have very smooth response and go low, the only problem may be that the distance from the diaphragm to the exit is kind of long for use on a Synergy arrangement (it limits how high I can get the midrange to go).
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Old 9th September 2016, 06:47 PM   #129
Eldam is offline Eldam  France
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And this one : Dayton Audio D250P-8 1" Polyimide Compression Horn Driver ?

It had been already tested with sucess in a synergy design in the other synergy bar
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Old 9th September 2016, 07:00 PM   #130
bwaslo is offline bwaslo  United States
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The D250P is a quasi-clone of the B&C DE250 (as is the DNA-360). They are structurally almost identical inside (though of the three, the DNA-360 had the smoothest and slightly wider response when I tested them).
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