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|22nd November 2006, 07:13 AM||#1|
BLH of LE8T
Please, anyone has plan for Back Load Horn of JBL LE8T? I've found on our 4R but I couldnot find out. Have you ever seen that one be build already? Or I can use BLH of Fostex FE206 (FE208) b'cuz they are 8' driver?
Do you have any comment if LE8T goes with some kind of tweeter like JBL L20 or L25? And x-over is just simple only one cap or they need more?
Ill do it by myself
|23rd November 2006, 08:15 PM||#2|
Join Date: Sep 2004
Location: Paris' suburbs
these speakers will be better in bass reflex or closed enclosures.
my 70 liters @35Hz were terrific !
add a tweeter with a simple cap from around 12 kHz or a little less.
ribbon or VIFA XT25 will perform very well with those Le8
|23rd November 2006, 10:01 PM||#3|
Account disabled at member's request
Join Date: Mar 2005
Got any T/S parameters or a link to them? I don't have time to go seeking them out at present, as I feel rotten, and I've a ton of work to do, but we can give a more detailed answer with some more data.
FWIW, there's no reason why they won't work in a BLH: any dynamic driver will, if you're prepared to go large enough, just how large depending primarily on their Q and Vas.
|24th November 2006, 07:45 AM||#5|
Thanks for your attention.
Pls, find here attachment:
Thanks for the link; I missed that thread the first time. It makes sense that there would be a consumer labeled version of the 2115.
But I was thinking there was something older than the Aquarius, and went looking in the catalogs. Is this site's library a great resource, or what!? Here is the one I remembered; I have a dim memory that someone posted about it several months ago:
This shows a LE8 from the 1962 catalog, which apparently introduces the "new" LE series in a separate section. The picture is a little blurry, but appears to me to show a black cone with a large whizzer cone, and an aluminum center dome.
Only two years later, in the 1964 catalog:
there is an LE8T with no whizzer, and a white cone.
In the 1969 catalog:
there is a D280, which appears to be a D208 with a white cone, supposedly "water resistant".
The 2115 appears in the 71 Pro catalog.
All of these have a white surround - didn't someone post a while back about this white plastic/rubber stuff getting stiff and cracking? My LE8Ts - I don't know when they were manufactured - had rotted dark gray surrounds when I got them, and the current kits have what appears to be the same. The dark surround first appears in the 1974 pro catalog on the 2115, though the 74 home catalog shows an LE8T with white surround.
In the 1979 components catalog, there is the LE8T-H, which I assume is the ceramic magnet version. I suppose that dates mine to between 74 and 79.
So .. all these appear to be different 8" fullrange speakers:
I haven't even tried to figure out the 8" midranges ... "
(Copy of Paul Joppa from http://audioheritage.org/vbulletin/s...&highlight=le8)
Some more infor:
"Fs = 55 Hz
Qms = 4
Vas = 36 liters
Cms = 761 µm/N
Mms = 11 g
Rms = 0.95 mohms
Xmax = 5.588 mm
Xmech = 11.18 mm
P-Dia = 152.4 mm
Sd = 0.0183 sq.m
P-Vd = 102 cu.cm
Qes = 0.54
Re = 5.5 ohms
Le = 0.3 mH
Z = 8 ohms
BL = 6.2 Tm
Pe = 30 watts
Qts = 0.48
no = 1.07 %
1-W SPL = 92.4 dB
2.83-V SPL = 94.1 dB
(The LE8TX is a 16 ohm version.)
Hope that it fullfill your request.
Ill do it by myself
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