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Thread: SAM1HF Schematic

  1. #16
    Administrator Robh3606's Avatar
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    There might be resistor pad changes I doubt they would give up any SPL if they didn't have too. There was no conventional CD comp in the 1400 network just a 2K trap. It's going to be similar but I suspect different values with the highpass missing.

    Rob
    "I could be arguing in my spare time"

  2. #17
    Senior Member JuniorJBL's Avatar
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    Some more pics. I stuck the LCR meter on the coils. Did not remove any components to get the measurements.
    L3 and L4 look to be aprox 20awg and 18awg
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    Always fun learning more.......

  3. #18
    Senior Member JuniorJBL's Avatar
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    Front of crossover with part placement.
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  4. #19
    Administrator Robh3606's Avatar
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    Smile

    It's a puzzle! What the heck is the 100uf for a safety highpass to protect the 435 when biamped?? I see the Imp network the network for the 045 a couple of pads and what I think are 2 notch filters on the 435. Other than that

    If I get a chance I will play with it in LEAP. I have my 435AL measurements on the horn from when I did the Arrays.

    Rob
    "I could be arguing in my spare time"

  5. #20
    Senior Member JuniorJBL's Avatar
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    Quote Originally Posted by Robh3606 View Post
    It's a puzzle! What the heck is the 100uf for a safety highpass to protect the 435 when biamped??
    I was wondering if that may be the case

    Quote Originally Posted by Robh3606 View Post
    If I get a chance I will play with it in LEAP. I have my 435AL measurements on the horn from when I did the Arrays.

    Rob
    Thanks Rob. Meantime I will continue to draw lines on paper and see what I come up with.
    Always fun learning more.......

  6. #21
    Administrator Robh3606's Avatar
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    I was wondering if that may be the case
    Look at the power ratings on the resistor pair right after them R3 R4 looks like it goes to ground through L2 R something?? We will figure it out, well maybe

    Rob
    "I could be arguing in my spare time"

  7. #22
    Senior Member JuniorJBL's Avatar
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    How does this look. I do not have any version of SPICE so would someone mind putting this in to see if I am not completly crazy?
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  8. #23
    Administrator Robh3606's Avatar
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    The Comp Network is across the 435 as well. I gotta go to the beach, it's a beautiful day here, if I get back early enough I will drop it inti LEAP tonight as see if it makes sense.

    Rob
    "I could be arguing in my spare time"

  9. #24
    Senior Member JuniorJBL's Avatar
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    Quote Originally Posted by Robh3606 View Post
    The Comp Network is across the 435 as well. I gotta go to the beach, it's a beautiful day here, if I get back early enough I will drop it inti LEAP tonight as see if it makes sense.

    Rob
    Thanks Rob! The beach sounds nice!

    Thanks to you as well Grumpy!!
    I think in the mean time I will go dig out an amp and a crossover hummm better get the le14's out ...................................
    Always fun learning more.......

  10. #25
    Administrator Robh3606's Avatar
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    It's looking kinda odd. Especially when you plug in a measurement on the horn. Here are are the Voltage drives into R loads at the driver impedences. Ignore the Ref Designation numbers as they won't make any sense as I used a previously loaded file so I wouldn't have to reload driver measurements. Does it look right to you??

    Rob
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  11. #26
    Obviously... not a golfer grumpy's Avatar
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    Given I used 8 ohms for the load and guessed
    on inductor resistances, the dip/peak freqs and
    levels seem within reason between simulation
    methods. It would be better to get out of circuit
    L values, but a measured xfer fcn using a
    resistive load would work as well.
    It's uh... uh... it's down there somewhere, let me take another look...

  12. #27
    Senior Member JuniorJBL's Avatar
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    Thanks for doing that Rob.

    It is time to get out the speakertester and figure out how to use it. I will install XP on my laptop this morning and get it up and running.
    Always fun learning more.......

  13. #28
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    You might want to whip up yourself a pair of the 1400 Array crossovers as well and determine which you prefer. If you do that make them cc versions. It's definitely worth it.

    I'd buy a couple of these networks myself if they were in stock but they aren't. MSRP on them is around $135 each. The 1400 Array networks (HF/UHF) are roughly half that price and out of stock as well.

    The coil values and their DCR's have to be measured out of the circuit. Too bad JBL doesn't leave the stickers with that information on them. Those 5W 1ohm8 resistors might be 1.8 ohm instead of 1.0 ohm.

  14. #29
    Obviously... not a golfer grumpy's Avatar
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    Rob, check units on L2 and value of R4. A rerun with the rest of the circuit, 6ohms for the mid, 4 for uhf,
    and a impedance magnitude sweep (using those resistive load values):

    1.8 vs 1.0 lessens the 1.2KHz notch a little more than 1 dB in simulation.
    (and I used DCR's appropriate for my guess on the wire gauge
    for air-core inductors... which will be too high if there's a metal or ferrite core).

    Updated plots with 1.8 vs 1.0 ohm resistors:

    Name:  Screen shot 2011-06-01 at 7.56.36 AM.png
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    It's uh... uh... it's down there somewhere, let me take another look...

  15. #30
    Senior Member JuniorJBL's Avatar
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    Quote Originally Posted by grumpy View Post
    1.8 vs 1.0 lessens the 1.2KHz notch a little more than 1 dB in simulation.
    (and I used DCR's appropriate for my guess on the wire gauge
    for air-core inductors... which will be too high if there's a metal or ferrite core).

    No metal as far as I can see. (hole in all of them) on plastic bobins. Not sure I want to dissasemble but I just might.......... he says to himself "It's only one side per"

    4313B

    I was thinking that I might want to build a 1400 cc'ed network if the schematic for my network was not available. I have read about the cc'ed one and how nice it is. Might just be the ticket!!

    I have lots of madisound bulk poly's to make just about any size cap I should need, so I will get some coils and resistors on order as to have plenty to choose from..........
    Hummmmm don't forget the 9v battery holders

    Thanks very much for everyone's help!
    Always fun learning more.......

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