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Thread: 2425H suitability?

  1. #16
    Senior Member ivica's Avatar
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    Quote Originally Posted by DogBox View Post
    Well, my parts list is taking for ages to grow; however, we have&nbsp;a pair of&nbsp;2470 with phenolic's as mentioned, two pairs of 2307, a set of 2308 lenses and&nbsp;3 &amp; 3/4 2555's with dodgy recones... I say "&amp; 3/4" as one of the four has its spider only partly glued to the magnet assembly and <br>makes a weird noise when played through. These are [well, at least "two"] all heading for 2235 recones when finances allow.&nbsp;<br>Be nice to have a closet like Alien_Shore and be able to find stuff like compression drivers!!! <img id="vB_Editor_001_smilie_78" title="Crying" border="0" alt="" src="http://www.audioheritage.org/vbulletin/images/smilies/cryingsmiley.gif">&nbsp; <br>Ah well, the 4343/4344 will get there eventually. <br>I used to live next door to a guy that first introduced me 'to' JBL, although I had always been interested in the speaker building craft... <br>He built his own [and was selling them] design based on the 4350 but with only "one" 15" low; 12" mid; 2" compression high and 2405 slots up top, in a cabinet a bit wider than the 4343. They did sound spectacular though!&nbsp; I was thinking of trying to re-do that design until I saw the <br>4343 and then found the 4344... AND you guys! Info galore! Love it!!!&nbsp;<img id="vB_Editor_001_smilie_4" title="Big Grin" border="0" alt="" src="http://www.audioheritage.org/vbulletin/images/smilies/biggrin.gif">&nbsp;<br><br>DogBox<br><br>Steve

    Hi Steve,

    As I have understood You have:
    - 4x 2225 (or 2235) drivers,
    - 2x 2470 drivers,
    - 2x 2307 horns,
    - 2x 2308 lenses,
    - 2x 2405 drivers.

    My be care opening of the bass drivers, and cleaning and re-gluing would be enough,
    but work on the network has not to be " depreciated ", and careful measurements too.

    Regards Ivica

  2. #17
    Senior Member DogBox's Avatar
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    Hi Ivica,
    Because of that bad post, my list is: 4x 2225 badly reconed, 1 needing the spider re-glued...
    2 x 2470 phenolic diaphragm
    4 x 2307 horns
    2 x 2308 lenses
    10" & 2405's to get and I will construct my own networks as per 3143 schematic.
    Now this damn modem has me worried. maybe just keep my posts short.

    DogBox

  3. #18
    Senior Member ivica's Avatar
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    Quote Originally Posted by DogBox View Post
    Hi Ivica,
    Because of that bad post, my list is: 4x 2225 badly reconed, 1 needing the spider re-glued...
    2 x 2470 phenolic diaphragm
    4 x 2307 horns
    2 x 2308 lenses
    10" & 2405's to get and I will construct my own networks as per 3143 schematic.
    Now this damn modem has me worried. maybe just keep my posts short.

    DogBox
    Hi DogBox,

    may be with 2 x 2225 per box, 10inch mid-bass is not 'a must', but 2405 is.
    Owing to, using two bass some ideas from 4350/4355 or Everest II D66000 would be well-come in creating cross-over network, especially for bass and mid-bass region (say below 800Hz), and for over 800, 3145 is good example....

    Regards
    Ivica

  4. #19
    Senior Member DogBox's Avatar
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    Hi Ivica,


    4350's are too big for me! 4343/4344 will be plenty for me to play with!
    So, the 10" IS on the list as well... I just have to be patient- they will come....

    DogBox

    [Steve]

  5. #20
    Senior Member ivica's Avatar
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    Quote Originally Posted by DogBox View Post
    Hi Ivica,


    4350's are too big for me! 4343/4344 will be plenty for me to play with!
    So, the 10" IS on the list as well... I just have to be patient- they will come....

    DogBox

    [Steve]
    I have no idea what would be the difference between mentioned 4343 and appropriated volume box for two 2225
    drivers, but I think the differences in dimensions would not be too much

    Regards
    Ivica

  6. #21
    Senior Member DogBox's Avatar
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    Hi Ivica,
    For double 2225's, the JBL PROFESSIONAL ENCLOSURE GUIDE suggests 'for general purpose low-end': 8.0 cu.ft. (225 litres)
    The 4343, going by the spec sheets, (incl. Midrange Chamber) is: 6.0 cu.ft. (170 litres) ..so for comprison..
    the 4345 has a total of 264 all up [but using an 18"] and the 4350 low frequency volume only (2x 2231H) is: 9.5 cu.ft. (265 litres)
    Did I mention that the 2225's that I got were 2nd hand, and (VERY BADLY!!) reconed? Not the sort of things to show in a cabinet
    without grills.. [and you'd be too afraid to take them off if you had them covered!]


    Steve

  7. #22
    Senior Member ivica's Avatar
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    Quote Originally Posted by DogBox View Post
    Hi Ivica,
    For double 2225's, the JBL PROFESSIONAL ENCLOSURE GUIDE suggests 'for general purpose low-end': 8.0 cu.ft. (225 litres)
    The 4343, going by the spec sheets, (incl. Midrange Chamber) is: 6.0 cu.ft. (170 litres) ..so for comprison..
    the 4345 has a total of 264 all up [but using an 18"] and the 4350 low frequency volume only (2x 2231H) is: 9.5 cu.ft. (265 litres)
    Did I mention that the 2225's that I got were 2nd hand, and (VERY BADLY!!) reconed? Not the sort of things to show in a cabinet
    without grills.. [and you'd be too afraid to take them off if you had them covered!]

    Steve
    Hi Steve,

    Here one thing has to be aware, so called 'mutual coupling of two nearby bass drivers' has to be included in the calculation,
    so I believe that more deeper box then 4343 would 'easily' reach about 200L what would be , on my opinion, OK.
    Unfortunately most of the box-calculation programs do not include such drivers coupling.
    Regards
    Ivica

  8. #23
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    The "Mutual Coupling" is just a way of saying that twice the cone area will be twice as efficient, until spacing becomes significant and destructive interference due to path-length differences begins affecting things. In other words, 2 drivers in parallel- 3dB from a doubling of current, 3dB from mutual coupling, +6dB sensitivity.
    Quote Originally Posted by ivica View Post
    Hi Steve,Here one thing has to be aware, so called 'mutual coupling of two nearby bass drivers' has to be included in the calculation,so I believe that more deeper box then 4343 would 'easily' reach about 200L what would be , on my opinion, OK.Unfortunately most of the box-calculation programs do not include such drivers coupling.RegardsIvica

  9. #24
    Senior Member ivica's Avatar
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    Quote Originally Posted by badman View Post
    The "Mutual Coupling" is just a way of saying that twice the cone area will be twice as efficient, until spacing becomes significant and destructive interference due to path-length differences begins affecting things. In other words, 2 drivers in parallel- 3dB from a doubling of current, 3dB from mutual coupling, +6dB sensitivity.
    Hi BADMAN,

    I totally agree with You, so with the proper networks to each of the bass driver ( say something like Ev2- DD66000 has been done, practically using one of the bass driver 'only' up to -say 150 Hz ),
    quite a good low-frequency response can be get in 'acceptable' box size, with the driver, as used as a single-driver, would not produce so low-frequency response,
    Mentioned +6dB rise in ULF region can 'compensate' drivers (alone) 'inability'.

    More can be find in:

    http://www.audioheritage.org/vbullet...l=1#post335992


    Regards
    Ivica

  10. #25
    Senior Member DogBox's Avatar
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    Quote Originally Posted by ivica View Post
    quite a good low-frequency response can be get in 'acceptable' box size....
    Regards
    Ivica
    Hi Ivica,
    Absolutely! I just don't have enough 'physical' room to fit boxes with two bass drivers, no matter if I DO get +6dB however 'acceptable' their box size may be..!
    With the huge amount of reading that I have done over the last month or so, I did come accross an article in the library where the subject of "mutual coupling" came up, and I also thought the 4350 & 4455 units were mentioned... In both cases, the use of the second driver was positioned within 'close' proximity to the other and was optioned in to obtain the gain in SPL [already mentioned]. Another reason why the MTM configuration [along with a proper 18dB slope C/O] works so well. (if you're into that sort of thing...?? great for centre channels; if you're into THAT type of thing!) Interesting to see another contributor [whose name escapes me, in Switzerland, I think] turned the 4350 on it's side and moved the position of the drivers to keep box volumes and C/O's the same... beautiful build! He had a "space" problem too!..but was able to get around it. I am finding more and more, that, the designs of the JBL range and the drivers used- the amount and types and baffle placement, a real tutorial into speaker design. No wonder I spend so much time... "down the library...!!"

    Steve

  11. #26
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    Holy Hijack Batman!

    I'm still looking for a pair of 2344. Does anyone happen to know how the 2425 compares to the B&C DE250?

  12. #27
    Senior Member Don Mascali's Avatar
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    I have dealt with these guys before. You have to talk to them to determine quality and availability at the time.


    http://www.jamminjersey.com/speakers...=jblcomp#Horns

    SCU217 JBL 2344 Bi-Radial Constant Coverage Horns, 1" Throat - Factory 2 piece models feature dense plastic flared fronts with flat mounting lips, metal throats, 100 x 100 dispersion. 1000 cycle cutoff frequency. Excellent condition. One pair available. $350
    4406, 4412A, L100, L100t3 (3 pair), L1, L7, 4645C, 4660A, 4695B, SR4735 and various DIY JBL Pro loaded systems.

  13. #28
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    Quote Originally Posted by Alien_Shore View Post
    Holy Hijack Batman!

    I'm still looking for a pair of 2344. Does anyone happen to know how the 2425 compares to the B&C DE250?


    These have been on Orange County C/L for over a month.


    http://orangecounty.craigslist.org/msg/3183816073.html

  14. #29
    Senior Member Don Mascali's Avatar
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    That sounds like a killer deal. I don't think the horns would be hard to fix up. I prefer the one piece horns too.
    4406, 4412A, L100, L100t3 (3 pair), L1, L7, 4645C, 4660A, 4695B, SR4735 and various DIY JBL Pro loaded systems.

  15. #30
    Senior Member frank23's Avatar
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    Fwiw, I have been using 2307/2308 and 2344 with the 2420 for a decade and have compared them over the years to 2440 (with titanium diaphragms) +2380 and the beryllium 2435 on pth1010 waveguides. All in my living room. My favorite is still the 2420/2344 combination. I sold the rest except for the 2307/2308 for nostalgic reasons. I play active and have the M553 active crossover set for CD compensation, which does not fully compensate, for the 2344 dropoff but does it good enough in my setup.

    I heard the 2370 once on the 2425 and did not like it one bit. It beams way too much (only 21 degr at 16kHz, lower also) and has a kind of shelve above 4kHz that is not a simple CD dropoff.

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