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wlk
10-30-2005, 09:18 AM
I am soliciting opinions on the the desirability of retrofitting a pair of JBL L-100t's to use JBL LE14A LF drivers.

The cabinet specfications for the L-100t's and the 240Ti's are as follows:

L-100t
Internal Net Volume = Between 3.3 and 3.4 Cubic Feet (Apx.)
Port Size = 4.1" ID, 5.25" L
LF Driver = 2214H

240Ti (Courtesy Giskard)
Internal Net Volume = 3.5 Cubic Feet
Port Size = 4.1" ID, 5.25" L
LF Driver = LE14H

Is the internal net volume of the L-100T's close enough to the recommended internal volume to allow the LE14A driver to work properly?
Would the retrofit improve the quantity and quality of the bass?
Would the general quality of the sound improve?
How does the sound quality of the LE14A compare to the LE14H?
How does the sound quality of the LE14A compare to the 2214H?

Zilch
10-30-2005, 11:25 AM
My "standard" LE14 box is Citation 7.4 at 3.38 cuft, tuned to ~29 Hz with stock 4" dia. x 8" deep port.

This alignment falls between BB6P's suggested optimum hi-fi and extended-bass designs. Citation 7.4 was a subwoofer using LE14H-1 and a simple internal crossover.

I've used it with the entire spectrum of LE14 versions, and it works well as a general purpose full-range box.

I designed the yet-to-be-built Z1 cabinets around that volume.

[Johnaec (speaker builder extraordinaire) still cleanin' out his garage.... :p ]

duaneage
10-30-2005, 06:27 PM
The 2214 is a formidable driver, very good bass performance. The xmax is very long and the 14 may or may not have as much cone excursion.


The cabinet should work, question is what will you do about the crossover to the 104H? The L100T had an interesting crossover network that appeared to tame down the output of the 2214 a bit with 18 ohms of resistance across the woofer itself, something not ordinarily done since woofers are usually NOT more efficient than mids and highs.

FWIW Iwould just try the three drivers on a test baffle board to see how the crossover and midrange perfomance comes out. There is more to a speaker than just bass performance.

wlk
10-30-2005, 10:42 PM
Zilch:
Thanks for internal volume and port specifications for the LE14A box. It appears that the L100T cabinet would work with the LE14A if I adjust the port size.

Duancage:
My L100T networks are N100Ts which have a 39 Ohm resistor accross the 2214H. The LF section is very similar to the N240TI network used in the 240TI. The 240Ti uses the LE14H, 104H and the 044Ti.
Could you expand your explaination on the 2214H since it is a relatively uncommon JBL driver and I can not find any specifications on it?
Is the 2214H considered to be a good LF driver?
Is it a better LF driver than the LE14A?

Gentlemen:
In your opinions would the LE14A sound better than the 2214 in the L100T's?
Or should I just foget the idea of the retrofit and leave the 2214's in the L100T's?

Regards
WLK
(From the rainy & cold Pacific Northwest)

Robh3606
10-31-2005, 04:20 AM
The 2214 isn't all that rare. You should be able to find the T/S in the table. It comes preloaded in Win Isd. Download the program, model the 2 and see where the differences are. They are both good drivers the Le-14 has an advantage in VLF in smaller box sizes. The 12 has higher power handling and X-Max however I have never had my Le-14's get into trouble. On the top end of the range I would guess the 2214 would be smoother since the 4425 takes it up to 1.2K. I have never ran an Le-14A up above 300Hz or so I can't comment. I like both and don't see how you could go wrong with either. In that box size they are close.


http://www.linearteam.dk/default.aspx?pageid=winisd

Rob:)

duaneage
11-03-2005, 09:10 PM
The 2214H has a very deep cone compared to other 12's. When crossing over to a midrange this distance may need to be taken into consideration. Change the woofer to one with a shallower cone and it COULD affect the midrange response a bit.


As to bass performance the 2214 has a three inch voice coil and a stiff cone. It will move large amounts of air.

T/S for it are
FS 23Hz
Qts .21
Vas 10.8 cu ft
That is what I measured on the pair I have. YMMV