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Small format cone driver in horn thread
Small format cone driver in horn thread
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Old 18th April 2019, 06:38 AM   #111
frangus is offline frangus  Australia
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guessing it sounds a touch sibilant?
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Old 18th April 2019, 10:39 AM   #112
kipman725 is offline kipman725  United Kingdom
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Quote:
Originally Posted by kec View Post
I didn't give up, just got sidetracked

I've been playing around with some more horns and 2 incher's.

This time the Eminence Alpha-2. Mated to a JBL clone I believe. 17.5" x 11" x 12" found here 11" x 17" ABS 2" Bolt-On Long Throw Horn 90deg x 40deg For Many 2" Exit Driver 647356202421 | eBay
This looks good, whats the sensitivity like?
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Old 18th April 2019, 02:54 PM   #113
phivates is offline phivates  United States
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Thanks kec.
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Old 18th April 2019, 04:03 PM   #114
kec is offline kec  United States
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Quote:
Originally Posted by kipman725 View Post
This looks good, whats the sensitivity like?
93dB @ 2.79V 3ft.
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Old 18th April 2019, 07:14 PM   #115
kec is offline kec  United States
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Default PRV WG45-50

Swapped the Alpha-2 driver to the PRV WG45-50 horn. This is a well made thick ABS horn. The 2" entrance is perfectly round and smooth. I did have to block sand the flange to flatten it a bit, but that's usually the case with most plastic horns. I put a thin narrow piece of adhesive foam tape around the hole - which I normally do.

Regarding the driver. I used a 4" plumbing cap as the enclosure. The plate was made from baltic birch slightly less than 3/4" thick. 1/4" x 1-1/2" screws are used as studs (see the previous pictures I posted) and were drilled and tapped with threads - yes, you can tap baltic birch. A 1" piece of bonded dacron was used for stuffing.

Measurements attached.

Actual SPL 92dB @ 2.77V 3ft.
Attached Images
File Type: png ALPHA-2 PRV WG45-50.png (30.8 KB, 199 views)
File Type: png ALPHA-2 PRV WG45-50 AXIS.png (31.4 KB, 206 views)
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Old 18th April 2019, 09:48 PM   #116
phivates is offline phivates  United States
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Screws meaning machine screws, of course. Curve on the PRV horn looks better and I presume sounds better, plus it's from PE not ePrey. Inspiring!
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Old 19th April 2019, 04:12 AM   #117
kec is offline kec  United States
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Listening to the Alpha/PRV right now. Very good so far. I'm very susceptible to poor sounding (harsh) horns/drivers and can usually tell in a few minutes whether or not i like it.

The horn coverage is very good - which is what my off-axis measurements showed. I have a 15 ft. X 30 ft. room and can walk around with no sign of dead spots. It's smooth and consistent from one side of the room to to the other. I'm impressed.

On the low end I'm using a Dayton PA200 8" woofer crossed at 500Hz. I haven't measured the complete system yet.
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Old 20th June 2019, 05:44 PM   #118
CFT is offline CFT  United States
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Any interesting development to share, gentlemen?
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