Results 1 to 15 of 16

Thread: Difference? LE-20, LE-25

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Senior Member
    Join Date
    Apr 2009
    Location
    New Orleans, Louisiana
    Posts
    521

    Difference? LE-20, LE-25

    What the difference in the LE 20s and the LE 25s? Size? Sound? Efficiency? thanks!

  2. #2
    Senior Member
    Join Date
    Apr 2009
    Location
    New Orleans, Louisiana
    Posts
    521
    Quote Originally Posted by midlife View Post
    What the difference in the LE 20s and the LE 25s? Size? Sound? Efficiency? thanks!
    Come on, someone knows this.

  3. #3
    Moderator hjames's Avatar
    Join Date
    Nov 2005
    Location
    NoVA - DC 'burbs
    Posts
    8,547
    Quote Originally Posted by midlife View Post
    Come on, someone knows this.
    have you tried doing a search??
    2ch: WiiM Pro; Topping E30 II DAC; Oppo, Acurus RL-11, Acurus A200, JBL Dynamics Project - Offline: L212-TwinStack, VonSchweikert VR-4
    7: TIVO, Oppo BDP103D, B&K, 2pr UREI 809A, TF600, JBL B460

  4. #4
    Senior Member grumpy's Avatar
    Join Date
    Oct 2003
    Location
    SoCal
    Posts
    5,742
    What is the reason for the question? round flange vs. square flange...
    hard flange vs. foam, diffraction-reducing ring, possibly different magnet
    material later (?). They're paper tweeters that evolved and were used in
    many designs. Hard to get too excited about it.

  5. #5
    Senior Member
    Join Date
    Aug 2003
    Location
    La Habra, California USA
    Posts
    1,546
    Well, if you're talking about the LE20, or more commonly the LE20-1, these were both Alnico based paper cone tweeters. Most of the time, these were 8 ohm drivers, nominally 1.4 inch diameter, with a voice coil about 0.75 in. diameter, 3.7.4.2 ohm DC resistance. All seem to have round faceplates with 2 or three fixing holes.

    I didn't know this till I just looked it up, that the early LE20 has a cast aluminum frame with black crinkle paint finish like most of the LE series, an outer screen covering the cone, and has typical JBL push terminals and screw down fixations for the magnet and cone/voice-coil mounting plate.

    These tweeters used a single or double roll of the paper edge as the surround.

    See photos below.

    The later LE20-1 appears to be a later version with a somewhat cruder outer magnet/return structure casing and a revised front voice coil/cone/mounting plate that screws on to the magnet from in front. However, the basic cone/voice coil looks like a holdover. I suspect it was much cheaper and easier to produce without much change in the sound. These were used in speakers like the original 4310 and before.

    The LE25, to me at least, is the ferrite conversion version of the LE20 but with newer faceplates that were square. Most faceplates started with flat and had open cell foam (that deteriorates with time) or neoprene surrounding the cone termination. The evolutionary LE26 used a shallow hill tapered plate over the usual mounting plate to provide diffraction control.

    All of the LE25 based tweeters used a paper cone but seem to have the same double roll paper suspension but doped and seemed taller (usually about 1/4 inch tall) above the mounting plate - best seen on the common L100 tweeters where the foam is gone. They seem to be sitting, at the outer edge, on top of a doped fabric/linen not unlike typical spider material.

    Hope this is a good start.
    Attached Images Attached Images     
    When faced with another JBL find, Good mech986 says , JBL Fan mech986 says

  6. #6
    Senior Member
    Join Date
    Aug 2003
    Location
    La Habra, California USA
    Posts
    1,546
    LE20-1 pics below, note the change to solder points instead of push terminals, and the cast casing and less machined front plate. There is usually a trim ring covering the plate mounting holes.
    Attached Images Attached Images     
    When faced with another JBL find, Good mech986 says , JBL Fan mech986 says

  7. #7
    Obsolete
    Join Date
    Apr 2003
    Location
    NLA
    Posts
    12,193
    The later LE20-1 appears to be a later version with a somewhat cruder outer magnet/return structure casing and a revised front voice coil/cone/mounting plate that screws on to the magnet from in front. However, the basic cone/voice coil looks like a holdover. I suspect it was much cheaper and easier to produce without much change in the sound. These were used in speakers like the original 4310 and before.
    The LE20-1 was simply an LE20 with the fancy front and back covers removed to decrease baffle real estate cost. JBL decided not to apply the crinkle finish to the LE20-1 since it was a "system only component" and not part of the Loudspeaker Component Series. Additionally they covered the exposed front plate with the black foilcal ring.


    The LE26 is probably the "best" of the bunch.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Difference in 035ti and 035tia Tweeter
    By rkasch in forum Lansing Product Technical Help
    Replies: 1
    Last Post: 09-08-2007, 10:50 AM
  2. LE14A DCR Difference
    By soundmotor in forum Lansing Product Technical Help
    Replies: 2
    Last Post: 10-24-2005, 04:57 AM
  3. professional ampli and not : what difference
    By gerard in forum Lansing Product Technical Help
    Replies: 3
    Last Post: 03-20-2005, 05:55 PM
  4. What is the difference??????
    By Gary L in forum Lansing Product Technical Help
    Replies: 3
    Last Post: 06-06-2004, 06:41 PM
  5. Functional difference between 127H and 127H1?
    By GordonW in forum Lansing Product Technical Help
    Replies: 0
    Last Post: 03-30-2004, 12:21 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •