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typical sensitivity of 4-5" cone driver on mid horn?
typical sensitivity of 4-5" cone driver on mid horn?
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Old 11th December 2015, 05:59 PM   #1
freddi is offline freddi  United States
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typical sensitivity of 4-5" cone driver on mid horn?
Default typical sensitivity of 4-5" cone driver on mid horn?

20 some years ago I ran JBL LE5-2 on 2.5" x 2.5" 250Hz tractrix horns as mids. I don't know if those LE5-2 were even in spec then. Today the one I tried has fs ~340 and qts ~2. It seems to behave well on the horn gapped around 1/4" from the throat.

I have a new 7 cubic foot folded midbass horn loaded with a Community "buyout" 12" speaker, so pulled out the LE5-2/250H tractrix and guess its around 100dB. Below is a comparison of it vs the midbass horn vs an Altec 511 with ancient alnico University SA-HF. Then a comparison of somewhat stronger but more limited on top Selenium Trio 250 also on a 511.

I would have to biamp if using the JBL cone-driven horn. Out of laziness I'll probably try to blend the Selenium to the midbass and add a tweeter around 2K5.

There's an "RT4" sealed back midrange at Ebay - I wonder if its about as hot as the LE5 and roughly its extension on tractrix like mine.

Are there inexpensive 4-5" cone speaker candidates today which work well on midhorns like mine? What kind of sensitively can one expect?


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typical sensitivity of 4-5" cone driver on mid horn?

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Old 11th December 2015, 07:21 PM   #2
POOH is offline POOH  United States
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The closed back RT4 doesn't load so well below 350 hz but compared to LE5 will be more sensitive (maybe 3-4db) in the midrange and more extended and smooth on top compared to the JBL.

I like the B&C 6pev13 and Faital proM5N12 - both will go lower and outperform LE5 in a front horn
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Old 11th December 2015, 07:31 PM   #3
freddi is offline freddi  United States
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typical sensitivity of 4-5" cone driver on mid horn?
thanks for the info POOH - do you use RT4 like a Unity or clustered together at the throat in your mono rig?
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Old 11th December 2015, 07:39 PM   #4
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Quote:
Originally Posted by freddi View Post
thanks for the info POOH - do you use RT4 like a Unity or clustered together at the throat in your mono rig?
No in a line. Of the above I mentioned I would take the B&C but it's only good to around 2.5k on top in round 180 flare tractrix with 4: throat, maybe 2.6 in a 3" thraot
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Old 12th December 2015, 01:20 AM   #5
freddi is offline freddi  United States
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typical sensitivity of 4-5" cone driver on mid horn?
is that a line as with a rectangular horn throat ? - or as a direct radiator line array ?
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Old 12th December 2015, 01:43 AM   #6
POOH is offline POOH  United States
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Horn loaded rectangular throat - conical plywood horn with 1" driver centered with 2 of the 4" below and two above in the throat, sounds great in mono - too lazy to build a second horn 32" square mouth , maybe someday- these are really nice sounding horn drivers for cheap
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Old 12th December 2015, 07:14 AM   #7
freddi is offline freddi  United States
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typical sensitivity of 4-5" cone driver on mid horn?
Cool - there's plenty of good music in mono - or you can listen twice to stereo recordings - one channel at at time
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Old 12th December 2015, 01:00 PM   #8
POOH is offline POOH  United States
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Mostly feed it mono signal from laptop to soundcard to triode streaming audio from Tapin Radio software - Like 75 thousand stations - plenty of opera

Raimersoft - TapinRadio

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Originally Posted by freddi View Post
Cool - there's plenty of good music in mono - or you can listen twice to stereo recordings - one channel at at time
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Old 12th December 2015, 06:17 PM   #9
freddi is offline freddi  United States
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typical sensitivity of 4-5" cone driver on mid horn?
big thanks POOH for the radio app.

there seems to be a lot of mono albums uploaded to Youtube


There's a lot of older public domain music at Archive.org and pretty good transfers - here's some


public domain 78 and lp transfers by F. Reeder - huge amount of classical stuff

http://archive.org/search.php?query=...e_audio&page=3

great transfer of the first act of Die Walkure 1935 with Lauritz Mechior, Emanuel List, Lotte Lehman by "Bigshot"
http://www.vintageip.com/xfers/walku...walter1935.mp3

details in a post 78RPM/Shellac discussion thread!

F. Reeder's transfers of 1920's Pop music
https://archive.org/details/1920sPOP...teNewTransfers

!920's to 40's music from a radio show "The Big Broadcast"
https://archive.org/details/1920s78Recordings

Voices Of Christmas Past 1898 to 1922
https://archive.org/details/Voices_o...t_1898_to_1922

Collected works of Enrico Caruso Vol. 1
https://archive.org/details/Caruso_part1

Vol. 2
https://archive.org/details/Caruso_part2
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Old 12th December 2015, 07:48 PM   #10
freddi is offline freddi  United States
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typical sensitivity of 4-5" cone driver on mid horn?
that little C-path midbass built for me is cute in 2-tone and light for its stiffness as most of the cabinet is made of 5/8" Baltic birch other than the baffle and lid which are 3/4" BB
http://i.imgur.com/7E9h3Bz.jpg
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