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Thread: Mystery Large Format Monitors

  1. #31
    Senior Member jim campbell's Avatar
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    i have some recollection of some very tacky demo rooms on the north side of the place lined with sound deadening stuff and altec was the brand they carried.i talked my bud into an audio research bryston combo but he didnt want to pay the extra for the jb's.....advance had infinity and most of my jb components came from western sound.most of the stuff in this book is geared toward pro/broadcast types as it is full of de essers,delay circuits,and even a b77 slow speed logger.i remember a tascam deck w/2 inch reels that sold for a hundred k and the specs on it were rated less than most consumer cassette players.i think it was +- 1db 20hz-15 khz and i still wonder if the trend toward super high freq response is just a wank

  2. #32
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    Quote Originally Posted by michaelg
    - I still have a pair of LS/4s in my home. These monitors very rarely show up in the used marketplace and are swallowed up when they do.

    - What would you like to know about them?
    Hi Michael,

    Welcome to the forum ! Thanks for posting all this new info !

    - Here's what I would like to know about your monitors ; ( since I have a few full-line Fostex brochures from this era ).

    (i) The model numbers of the two different 15" woofers that were used in your monitors ( LS/3 vs the LS/4 ) .

    Thanks <> Earl K

    ps ; Were you also associated with Servo ( Electronics Systems Ltd. ) ?

  3. #33
    Member michaelg's Avatar
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    Exclamation

    Quote Originally Posted by Earl K View Post
    (i) The model number of the 15" woofer that you used in your monitors .
    (ii) Did all three models of monitors use the same woofer model ?
    • The LS/2 used a 30cm L355 below 800Hz;
    L355: 8-ohms, fo=40Hz, fo-5K, 98dB, 100W, 8cm Alum VC, 1.1kg Alnico, 5.7kg total
    • The LS/3 used a 40cm L475 below 800Hz;
    L475: 8-ohms, fo=25Hz, fo-3.5K, 100dB, 150W, 10cm Alum VC, 1.51kg Alnico, 8.6kg total
    • The LS/4 used a 30cm L355 mid-bass crossed over at 800Hz and 200Hz and dual 40cm FW400S (4-ohms) below 200Hz.
    FW400S: 8-ohms, fo=17Hz, fo-2.5K, 96dB, 150W, 10cm Copper VC, 1.11kg Alnico, 8.6kg total.

    The L475 and the FW400S used the same frame and motor but different cones. The L475 used a lightweight edge-wound aluminum voice coil for excellent transient response and the FW400S used an extra long two-layer round copper voice coil and a coated cone to optimize the mass and reduce the fo. All woofers used an epoxy-mica former for stable high temperature operation.
    (iii) The gap height ( ie; depth ) for this woofer
    I'll have to dig out my drawings and let you know.
    Were you also associated with Servo?
    Servo Electronics (Bob Black) and Canadian Rogers Western (Kemmel Rogers) became investors in our company as we grew.

    Were you involved with Servo?
    Michael Gillespie.
    204.943.9000


  4. #34
    Senior Member richluvsound's Avatar
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    Beautiful

    Hi ,

    I'm not really a techy in the electrical department ,but i do make a comfortable living as a designer here in London . I have to say that your studio monitors are designed beautifuly. Minimal, elegant and functional.
    LESS IS MORE. Did you design them ?

    Rich

  5. #35
    Webmaster Don McRitchie's Avatar
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    Quote Originally Posted by michaelg View Post
    Actually, they don't!

    The systems listed on those links are sound reinforcement designs, not studio monitors. They use a different family of drivers.

    I'm pretty sure that is not the case for all of the drivers. There are Alnico bass drivers, small format Alnico compression drivers with wood horns and even more modern ferrite drivers with half roll surrounds, low fs and low power handling that would seem ill suited to sound reinforcement. These drivers have long stopped being distributed in the US, but have a following in their home country where they compete with TAD, GOTO etc. for custome hi-fi applications. For example, check out the following links:

    http://www.fostexinternational.com/d...W-Series.shtml

    http://www.fostexinternational.com/d...-Drivers.shtml

    http://www.fostexinternational.com/d...ial-Horn.shtml
    Regards

    Don McRitchie

  6. #36
    Member michaelg's Avatar
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    Quote Originally Posted by richluvsound View Post
    I have to say that your studio monitors are designed beautifuly. Minimal, elegant and functional.
    LESS IS MORE. Did you design them ?
    Yes. Thanks very much!
    Michael Gillespie.
    204.943.9000


  7. #37
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    Quote Originally Posted by MichaelG
    Were you involved with Servo?
    - No, I was an end user of a couple different models of Servos' fiberglassed horn flares .

    - Thanks for answering my questions about the woofer models used in your monitors .


  8. #38
    Senior Member JBLRaiser's Avatar
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    Damn Michael

    Quote Originally Posted by michaelg View Post
    I started as Assistant Chief Engineer at CKY AM/FM in 1969 and spent my first couple paychecks on a pair of 19s from Ron at Oakwood along with an original Phase Linear 700.

    I only kept the speakers for a couple of weeks and it was a couple more before my head stopped ringing!
    You were doing so well until the 19's comment. I'm sure it was the Phase Tin-ears.

  9. #39
    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by michaelg View Post
    I designed those monitors in 1978/9 and was the president of Interlake Audio. We were the original Fostex presence in North America.

    What would you like to know about them?
    Thanks for popping in.

    Hearing your speakers at the 1980 AES Convention in Los Angeles really made a lasting impression. I think your posts here have pretty well covered all of my questions.


    Widget

  10. #40
    Webmaster Don McRitchie's Avatar
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    Quote Originally Posted by JBLRaiser View Post
    You were doing so well until the 19's comment. I'm sure it was the Phase Tin-ears.
    I'm guessing that he may be confusing early model Valencias with the Model 19's since he implies he bought them around 1969. While the 19's still ring, they're not nearly as bad as the unequalized 806/811's of the late 60's and early 70's Altecs. While Michael only lasted two weeks with his, I stuck it out for a year with my similar era Santiago's before my bleeding ears dictated a reprieve.
    Regards

    Don McRitchie

  11. #41
    Member michaelg's Avatar
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    Quote Originally Posted by Don McRitchie View Post
    he may be confusing early model Valencias with the Model 19's [...] 806/811's of the late 60's and early 70's Altecs.
    Valencias! 811! Yeah ... that "rings" true. Give me a break fellas - it was only 40 years ago!

    I do remember getting a pair of experimental diaphragms (beryllium?) from an Altec rep (Margolis? Lombardi?) which improved them enough that I could sell them.
    Michael Gillespie.
    204.943.9000


  12. #42
    Member michaelg's Avatar
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    Quote Originally Posted by Don McRitchie View Post
    I'm pretty sure that is not the case for all of the drivers.
    I'm not ignoring this issue but am posting from my cell phone/pda in an airport at the moment. Will respond on the morrow when I'm back at a keyboard.
    Michael Gillespie.
    204.943.9000


  13. #43
    Senior Member louped garouv's Avatar
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    Quote Originally Posted by michaelg View Post
    I do remember getting a pair of experimental diaphragms (beryllium?) from an Altec rep (Margolis? Lombardi?) which improved them enough that I could sell them.
    oh goodness..... another Altec "holy grail"



    really nice looking monitors....
    and those horns are absolutely beautiful

  14. #44
    Senior Member glen's Avatar
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    Welcome Michael!

    And thanks for the great info on those gorgeous speakers!
    glen

    "Make it sound like dinosaurs eating cars"
    - Nick Lowe, while producing Elvis Costello

  15. #45
    Senior Member spkrman57's Avatar
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    Michael, Thanks for sharing your historical references!

    I am loving this thread as it is progressing!

    Regards, Ron
    JBL Pro for home use!

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