Page 2 of 4 FirstFirst 1234 LastLast
Results 16 to 30 of 51

Thread: 4355/3155 clones

  1. #16
    Dwight
    Guest

    4355 clones

    Are any of the "clones" using the 2234H or dual 2235H's? Maybe
    the "broad bump between 200Hz - 300Hz" was a problem that
    JBL addressed by using the 2234H to limit the "2235H's from contributing too much mid bass".

  2. #17
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,719
    JBL built the 4355 with dual 2235s and the 4435 with dual 2234s concurrently. They are different design philosophies and some prefer the former and others the latter. In the case of the 4435, the use of the 2234 woofer does not solve the midrange peak problem, their crossover does. It is designed to only allow both woofers work in tandem below about 100Hz, above that the woofer directly below the HF unit becomes the sole driver with increasing frequency.

    Here is the excerpt the describes the situation I am talking about with a large cone mid driver and a 15" woofer, or in the case of the 4355 a pair of 15" woofers. JBL recommends the same special active crossover card for both the 4345 (an updated big brother to the 4343) and the 4355.
    Attached Images Attached Images  

  3. #18
    Obsolete
    Join Date
    Apr 2003
    Location
    NLA
    Posts
    12,193
    Yet another voltage drive
    Attached Images Attached Images  

  4. #19
    Senior Seņor boputnam's Avatar
    Join Date
    Apr 2003
    Location
    northern california
    Posts
    6,142
    Originally posted by Giskard
    Yet another voltage drive
    OK, a challenge for you, if you're in a goofy enough mood for it. You're the only one I know could get it done...

    Can you show the two cases of, say, either the 4343 or 4345, in biamp mode with the LF and "others" both in phase and in opposite phase (polarity)?

    I'm dang curious how much of the troublesome summing is obviated by having the LF and low-MF out of phase.

    Pretty please?

    We need a smily face for a dog barking up a tree...
    bo

    "Indeed, not!!"

  5. #20
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,719
    I'll add on to Bo's question, does anyone have an idea why JBL would design the 4345 with the 10" mid with reversed polarity and the 4355 with it's 12" mid in correct polarity?

    The one difference that I can think of is that the 4355 is ALWAYS bi-amped.

  6. #21
    Obsolete
    Join Date
    Apr 2003
    Location
    NLA
    Posts
    12,193
    Originally posted by Mr. Widget
    I'll add on to Bo's question, does anyone have an idea why JBL would design the 4345 with the 10" mid with reversed polarity and the 4355 with it's 12" mid in correct polarity?

    The one difference that I can think of is that the 4355 is ALWAYS bi-amped.
    My guess would be that it has to do with the lengths of the horns. I think one is 4" longer than the other.

  7. #22
    Senior Seņor boputnam's Avatar
    Join Date
    Apr 2003
    Location
    northern california
    Posts
    6,142
    Originally posted by Giskard
    My guess would be that it has to do with the lengths of the horns. I think one is 4" longer than the other.
    Very close...
    If the brochures can be trusted the 2307 is 7-3/4in and the 2311 is 4-5/8in (4345 and 4355, respectively), for difference of 3-1/8in.

    So, whaddya think - is it possible to model the 4343/4345 biamped, and see the effect of opposing the phasing? Or should I

    I'm still marvelling in the improvement of the new diaphragms for the 2421B's. I'm willing to try ANYTHING
    bo

    "Indeed, not!!"

  8. #23
    Senior Seņor boputnam's Avatar
    Join Date
    Apr 2003
    Location
    northern california
    Posts
    6,142
    Holy smokes! :shock:

    That'd be that 4343 255Hz "bump" the Widget was referring to, eh?

    Busy boy/girl, Giskard...

    bo

    "Indeed, not!!"

  9. #24
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,719
    Bo, those are phase angle plots, not frequency plots.

  10. #25
    Senior Seņor boputnam's Avatar
    Join Date
    Apr 2003
    Location
    northern california
    Posts
    6,142
    Originally posted by Mr. Widget
    Bo, those are phase angle plots, not frequency plots.
    I realize that, but I'm trying to understand if that phasing is contributing to the "bump". Whaddya think?
    bo

    "Indeed, not!!"

  11. #26
    Senior Seņor boputnam's Avatar
    Join Date
    Apr 2003
    Location
    northern california
    Posts
    6,142
    Originally posted by Giskard
    You guys know each other?
    You're being goofy...

    But I've laughed at the other post, all morning. I have no clue what that meant.
    bo

    "Indeed, not!!"

  12. #27
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    9,719
    " I realize that, but I'm trying to understand if that phasing is contributing to the "bump". Whaddya think?"

    I don't think that it is that simple of a relationship that one can infer one from the other.

    In any event, I think the girl/boy with bread breath is far more amusing.

  13. #28
    Obsolete
    Join Date
    Apr 2003
    Location
    NLA
    Posts
    12,193
    Originally posted by boputnam
    OK, a challenge for you, if you're in a goofy enough mood for it. You're the only one I know could get it done...

    Can you show the two cases of, say, either the 4343 or 4345, in biamp mode with the LF and "others" both in phase and in opposite phase (polarity)?

    I'm dang curious how much of the troublesome summing is obviated by having the LF and low-MF out of phase.
    Use an RTA and find out.

  14. #29
    Senior Seņor boputnam's Avatar
    Join Date
    Apr 2003
    Location
    northern california
    Posts
    6,142
    Originally posted by Giskard
    Use an RTA and find out.
    Widget? Are you game? I'll run wires and sling beers.

    Closest I'll get to Tahiti...
    bo

    "Indeed, not!!"

  15. #30
    Senior Member
    Join Date
    Apr 2003
    Location
    Australia
    Posts
    7,942
    Yeah,

    And Mr Widget we wanna an email/post card from Tahiti please.



    Ian

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Proud of my 4313B / L96 clones
    By Guido in forum Lansing Product General Information
    Replies: 23
    Last Post: 01-17-2005, 01:08 PM
  2. New BX63a Clones ?
    By LE15-Thumper in forum Lansing Product Technical Help
    Replies: 15
    Last Post: 09-09-2004, 09:14 AM
  3. 4530 Clones
    By Mike C in forum Lansing Product General Information
    Replies: 19
    Last Post: 10-11-2003, 11:46 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
  •