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Thread: The purpose of JBL E145

  1. #31
    Administrator Robh3606's Avatar
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    Well I got one!! Have another coming in about 2 weeks after its reconed. There is no doubt about the 801C similarity with the E-145. The cone texture, rolled surround, and frame are identicle. Least I can't tell them apart. Now I have to drop it in and start listening.

    As a side note I asked Giskard to run a couple of plots on his software Bass Box Pro 6 and there seems to be a difference on how the programs tune the boxes. I will restart the WinIsd thread for those interested.

    Rob

  2. #32
    Alex Lancaster
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    Wink

    As far as I know, the basket of all 4" coil speakers are the same; The 145's used a circular spacer about 1" thick, which made the cone have a smaller included angle, thus stiffer, the surround was wider, for more excursion.

    They were made mainly for organ.

    I used some (about 6 feet long horn loaded) in disco installations, but liked the E140's or 2205H's better.

    I have 2 original brand new in the box E140-8 recone kits (about 20 years old) that I would trade for 2245H recone kits.

    Thanks: Alex

  3. #33
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    "the basket of all 4" coil speakers are the same"

    Nope. It is true though that with the move from alnico to SFG ferrite assemblies the number of variations was reduced.

  4. #34
    Webmaster Don McRitchie's Avatar
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    The K/E145 and 150-4 baskets are different, but are not all the other 15" baskets the same? I know this wouldn't apply to recent speakers, since JBL has developed numerous uniqe designs in the past few years.
    Regards

    Don McRitchie

  5. #35
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    "are not all the other 15" baskets the same?"

    Ok, let me back up a second. If we are talking ONLY about the frame and not the magnetic assembly bolted to it then yes, one is probably correct in stating that "the basket of all 4" coil speakers are the same". Once you bolt the magnetic assembly onto the frame it's a whole new ballgame. For instance, the E130/E140... SO many people think (I erroneously did too) they can pop a 2225H cone kit into one of these bad boys and end up with a 2225H. There's an ad on eBay right now claiming that very thing. Heck, even Greg forgot that the E130/E140 baskets were different and he was in on the design of the things! When I reminded him that they had a different flux density he exclaimed "Oh that's right! Those things have a 1/8" thicker magnetic assembly which will shift everything up!" Sure enough, we went and measured a 2225H magnetic assembly and then an E130 magnetic assembly and the E130 was indeed 1/8" thicker. Brutally powerful motors BTW...
    Last edited by 4313B; 07-14-2003 at 09:07 AM.

  6. #36
    Administrator Mr. Widget's Avatar
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    Actually not even the baskets are the same between various 15s. A number of years ago I used a blown D130 as a fit template for some cabinets I was building. I was using the cabinets to do some comparisons between a pair of 60's LE15As and 70's LE15Bs. I don't remember which one was larger, but one pair dropped in and the other pair required cutting the hole another 1/16" larger.

    Then there are the much older models with the gussets, these can only be rear mounted.

  7. #37
    Alex Lancaster
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    By baskets, I meant of course just the aluminum die cast part, not the magnet, pole piece, top plate, etc.

    In my earlier post I should have said E145-8 recone kits.

    Thanks: Alex

  8. #38
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    The link from post 4 no longer works:
    http://www.lansingheritage.org/image...-3a/page06.jpg

  9. #39
    Junior Member TriVista's Avatar
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    Google it?

    Quote Originally Posted by mtchyz250f View Post
    The link from post 4 no longer works:
    http://www.lansingheritage.org/image...-3a/page06.jpg
    Google or Bing "site:www.lansingheritage.org tech1-3a" as quoted and you'll find both the JBL Tech Note 1.3a (http://www.lansingheritage.org/html/...s/tech1-3a.htm) and the commendable Lansing Heritage sitemap (http://www.lansingheritage.org/sitemap.htm)

  10. #40
    Senior Member 57BELAIRE's Avatar
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    swap?

    Quote Originally Posted by Don McRitchie View Post
    The K/E145 and 150-4 baskets are different, but are not all the other 15" baskets the same? I know this wouldn't apply to recent speakers, since JBL has developed numerous uniqe designs in the past few years.
    I swapped out my L300 woofers (136H) for a pair of E145's awhile back just for grins and decided to leave them in cause they sounded so good (not better, just different). I was also thinking about the same
    swap for the 150-4C's in the Paragon (to give them a rest) but saw Don's post and have reservations.
    Any thoughts?
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    OPUS POCUS

  11. #41
    Senior Member edgewound's Avatar
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    Quote Originally Posted by 57BELAIRE View Post
    I swapped out my L300 woofers (136H) for a pair of E145's awhile back just for grins and decided to leave them in cause they sounded so good (not better, just different). I was also thinking about the same
    swap for the 150-4C's in the Paragon (to give them a rest) but saw Don's post and have reservations.
    Any thoughts?
    The E145 is the modern equivalent of the 150-4C. Might be a tad more efficient. It's a beast of a 15". Clean, loud, linear, low, punchy. Doesn't have the low reach of the 2235H/136H due to the higher Fs, but what it lacks there, it makes up for in all the other areas.

    Should really shine in a Paragon.
    Edgewound...JBL Pro Authorized...since 1988
    Upland Loudspeaker Service, Upland, CA

  12. #42
    Senior Member ratitifb's Avatar
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    E145-8 in the L300 what about the port tunning ?

  13. #43
    Administrator Robh3606's Avatar
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    what about the port tunning ?
    It's about 10Hz to low so it really won't make all that much of a difference with the E-145

    Rob
    "I could be arguing in my spare time"

  14. #44
    Senior Member 57BELAIRE's Avatar
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    hmmmm

    Quote Originally Posted by ratitifb View Post
    E145-8 in the L300 what about the port tunning ?
    If you're familiar with my posts in general you'll know I let my ears be the judge....and the 145's sound pretty darn good in those cabs. As for "port tuning"....I'll leave that to the experts
    OPUS POCUS

  15. #45
    Senior Member gibber's Avatar
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    K145 suspect, too

    Quote Originally Posted by 4313B View Post
    No the E145 isn't rare.

    Note that it's the same transducer as the 150-4H (Everest).

    http://www.audioheritage.org/html/pr...bl/everest.htm

    The K-series are alnico, the E-series are ferrite. JBL increased the flux densities in the E-series though...

    Note that these TS parameters haven't been checked yet so some might be "wrong"

    ***********
    K120, K151, E120, E145 look suspect

    Well, K145 values in that table are also a bit off...

    I got a pair of K145s recently and after measuring them for T/S, had them re-magged. After re-magging, i would have assumed them to meet table values. The pair changed as follows (note this is a early paper surround pair with a higher Fs than later 145-8 and 145-16 units had with their treated fabrix surrounds). A third unit is not re-magged yet and included just for a look at sample consistency (lots of Alnico loss evident in 2 out of 3 samples).

    Param JBL-value Bass1 re-mag Bass2 re-mag Bass3
    F0 35 40.1 38.6 40,5 39,7 41.2 Hz
    Re 8.8 8.8 8.8 8.4 8.4 8.0 Ohm
    fs 35 38.5 36.1 36.9 37.3 40.9 Hz (fs with me is sqrt of fl * Fh)
    Qms 6.0 2.91 2.46 1.85 4.52 6.67
    Qes 0.3 0.31 0.26 0.45 0.26 0.38
    Qts 0.29 0.28 0.23 0.36 0.24 0.36
    fs/Qts 120 137 154 102 154 115 Hz

    All units are labelled "K145" with a second line on the label stating impedance as "8 ohms". In fact these might be considered 12 Ohm. Later units were called "K145-8" or "K145-16" and had DC resistances similar to E145-8 (ca 5.5 Ohm) and E145-16 (ca 12.5 Ohm).

    Note that Qts values for this Alnico bass after re-mag are very close to what is stated by JBL for the Ferrite version E145.

    Sorry for the formatting, i did not take away the spaces. Hope its useful to someone
    Last edited by gibber; 07-15-2012 at 04:32 PM. Reason: Spelling

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