Results 1 to 11 of 11

Thread: Diaphragm options for 2420/LE85

  1. #1
    Senior Member
    Join Date
    Aug 2010
    Location
    Jättendal (Giant Valley), Sweden
    Posts
    736

    Diaphragm options for 2420/LE85

    I am the happy new owner of a pair of 2420 and a pair of LE85. I have not opened them yet, but guy I bought them from told me that the diaphragms are titanium. Most probably they are aftermarket. I havn't opened them yet to check.

    I have checked Orange County repairs, and they got the
    D16R2421, http://www.speakerrepair.com/mm5/merchant.mvc?Screen=PROD&Store_Code=genem&Product_ Code=10-252&Category_Code=JBL-Diaphragms. I am surprised that they are as pricey as the 4" diaphragms.

    I also found the
    D16R2425, titanium. Not an option.

    The Radian 1225-16 is an option. These are aluminium alloy. Are these an option?

    And of course aftermarket noname brand. Not an option for me?

    Will there be beryllium diaphragms from TrueExtent?


    Compared to 4" (diaphragm) drivers, how will these sound?

    Which one is more sought after the LE85 or the 2420?

  2. #2
    Senior Member richluvsound's Avatar
    Join Date
    Dec 2006
    Location
    london england
    Posts
    2,075

    Be !

    Hi Moreten ,

    Be due out any day now : Go with Ti and aquaplas.. You can compensate with your amp choice .
    I found Al a little too laid for my music ..... lots of guitar !

    Congrats on the purchase !

    Rich

  3. #3
    Senior Member
    Join Date
    Aug 2010
    Location
    Jättendal (Giant Valley), Sweden
    Posts
    736
    175 diaphragm talks about these drivers.

    Quote Originally Posted by edgewound View Post
    Yes...and the 2410, 2421 and 2425, 2470(phenolic) diaphragms are all interchangeable. 2410/LE175 has the tangential compliance.

    2421 and 2425 have the diamond pattern compliance.

    For longest lasting durability in a metal dome, the titanium unit gets the nod. A coat of aquaplas will tame the resonances of the 2 mil dome.
    D16R2410 316$ Aluminium.
    D16R2421 336$ Aluminium.
    D16R2426 176$ Titanium.
    D16R2470 284$ Phenolic.
    Radian 1225-16 126$ Aluminium alloy with mylar surround.

    There seems to be no titanium with aquaplas or beryllium diaphragms.

  4. #4
    Senior Member HCSGuy's Avatar
    Join Date
    Jan 2009
    Location
    Bend, OR
    Posts
    598
    Beryllium are not out yet - if anyone here has any information they can give their input, but I do not think their release is imminent.

    You are correct on the aquaplas, though you may PM Guido or one of the pro servicers on the forum who may be able to furnish the diaphragms and dust them with aquaplas for you.

    I have no experience with different diaphragms - my drivers all have the original diaphragms, though I think the threads I've seen on the topic have generally preferred the aluminum diaphragms with tangential surrounds for sound quality in home use - that's the D16R2410. The D16R2421 is aluminum with diamond surround, D16R2426 is Titanium with Diamond surround.

    That's my 2 cents...

  5. #5
    Senior Member
    Join Date
    Aug 2010
    Location
    Jättendal (Giant Valley), Sweden
    Posts
    736
    Thanks HCSGuy!

    In Playing with a 2426 Guido test different combinations of drivers and diaphragms.

    I am a bit surprised that these drivers with the used horn (2307) doesn't reach 20 kHz. Is this a limitation of the drivers or the horn?

  6. #6
    Administrator Robh3606's Avatar
    Join Date
    Apr 2003
    Location
    Rocinante
    Posts
    7,984
    I am a bit surprised that these drivers with the used horn (2307) doesn't reach 20 kHz. Is this a limitation of the drivers or the horn?
    A little of both. Here's more recent 2307 measurement I did a couple if years back.

    Rob
    Attached Images Attached Images  
    "I could be arguing in my spare time"

  7. #7
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,981
    Quote Originally Posted by more10 View Post
    Compared to 4" (diaphragm) drivers, how will these sound?
    The 4" diaphragmed drivers sound more relaxed at all SPLs and play loudly with much more grace than the 1.75" models.

    Quote Originally Posted by more10 View Post
    Which one is more sought after the LE85 or the 2420?
    IN general the JBL Consumer models are more popular with collectors and therefore have higher resale value.

    Quote Originally Posted by Robh3606 View Post
    A little of both. Here's more recent 2307 measurement I did a couple if years back.
    Rob, which driver was that? Is that a "dry" curve, or did you have any compensation?


    Widget

  8. #8
    Senior Member
    Join Date
    Aug 2010
    Location
    Jättendal (Giant Valley), Sweden
    Posts
    736
    My plan is to use both 4" and 1.75" diaphragmed drivers in the same system, the 1.75" above 2,5 kHz. Is there a JBL 1.75" diaphragmed driver/horn combination that will acomplish this?

  9. #9
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,981
    Quote Originally Posted by more10 View Post
    My plan is to use both 4" and 1.75" diaphragmed drivers in the same system, the 1.75" above 2,5 kHz. Is there a JBL 1.75" diaphragmed driver/horn combination that will acomplish this?
    I think there is very little to gain doing this and this sort of design is fraught with numerous potential design problems. Using a proper tweeter above 10K or so is much easier to integrate and will offer a better top end.


    Widget

  10. #10
    Junior Member speakerex's Avatar
    Join Date
    May 2008
    Location
    florida
    Posts
    27
    My reference material shows: D16R2421 Aluminum $252.00- generally better sound quality, D16R2425 titanium $135.00- higher power handling, D16R2470 $215.00 phenolic- more mid range. We also have D16R2421 $252.00, D16R2410 $199.00. I never heard of a D16R2426. http://www.reconingspeakers.com/prod...l-diaphragms1/

    Quote Originally Posted by more10 View Post
    I am the happy new owner of a pair of 2420 and a pair of LE85. I have not opened them yet, but guy I bought them from told me that the diaphragms are titanium. Most probably they are aftermarket. I havn't opened them yet to check.

    I have checked Orange County repairs, and they got the
    D16R2421, http://www.speakerrepair.com/mm5/merchant.mvc?Screen=PROD&Store_Code=genem&Product_ Code=10-252&Category_Code=JBL-Diaphragms. I am surprised that they are as pricey as the 4" diaphragms.

    I also found the
    D16R2425, titanium. Not an option.

    The Radian 1225-16 is an option. These are aluminium alloy. Are these an option?

    And of course aftermarket noname brand. Not an option for me?

    Will there be beryllium diaphragms from TrueExtent?


    Compared to 4" (diaphragm) drivers, how will these sound?

    Which one is more sought after the LE85 or the 2420?

  11. #11
    Administrator Robh3606's Avatar
    Join Date
    Apr 2003
    Location
    Rocinante
    Posts
    7,984
    Rob, which driver was that? Is that a "dry" curve, or did you have any compensation?
    Hello Widget

    That is a 2425 with an Aquaplased 2426 Ti diaphram. It was mounted in my 4344 using a 2307 horn with no HF compensation and no crossover in place. That is with the lense removed.

    Rob
    "I could be arguing in my spare time"

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Diaphragm options for 2420/LE85
    By more10 in forum Lansing Product Technical Help
    Replies: 0
    Last Post: 10-30-2010, 12:27 PM
  2. 2440 diaphragm options
    By more10 in forum Lansing Product Technical Help
    Replies: 25
    Last Post: 09-27-2010, 10:03 PM
  3. JBL 2420 Horn Options - Suggestions Please
    By wlk in forum Lansing Product General Information
    Replies: 23
    Last Post: 11-03-2008, 11:37 AM
  4. LE85/2420 Inner Horn Dimensions
    By Beowulf57 in forum Lansing Product Technical Help
    Replies: 16
    Last Post: 09-24-2008, 07:02 AM
  5. 2421 Al diaphragm on LE85 again
    By scorpio in forum Lansing Product Technical Help
    Replies: 7
    Last Post: 09-09-2005, 09:59 AM

Posting Permissions

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