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Thread: JBL horn vintage system

  1. #1
    Junior Member Linnea's Avatar
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    JBL horn vintage system

    Hi,

    What about this speakers system?

    Cabinet rearloaded folder horn: JBL C435
    High frequency drivers: JBL 2420
    High frequency horns: JBL 2345
    Mid/bass frequency: JBL 130A
    crossover: 800 hz

    I want make by a craftsman this loudspeakers.
    I think will use a low power integrated tube amplifer or SS class A.

    Tks
    Nedo

  2. #2
    Junior Member Linnea's Avatar
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    no one ?
    :dont-know

  3. #3
    rgrjit8
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    Quote Originally Posted by Linnea View Post
    no one ?
    :dont-know
    Build it, and they will come.

  4. #4
    Senior Member jcrobso's Avatar
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    Nice!

    Quote Originally Posted by Linnea View Post
    Hi,

    What about this speakers system?

    Cabinet rear loaded folder horn: JBL C435
    High frequency drivers: JBL 2420
    High frequency horns: JBL 2345
    Mid/bass frequency: JBL 130A
    crossover: 800 hz

    I want make by a craftsman this loudspeakers.
    I think will use a low power integrated tube amplifer or SS class A.

    Tks
    Nedo
    I got the plans from JBL for the C435 and made a pair of them.
    I put in my D140F speakers. Then added LE175 driver with horn(at 1200hz) & lens and later added 075 HF drivers. John

  5. #5
    Senior Member jcrobso's Avatar
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    Update C40 Harkness

    Quote Originally Posted by jcrobso View Post
    I got the plans from JBL for the C435 and made a pair of them.
    I put in my D140F speakers. Then added LE175 driver with horn(at 1200hz) & lens and later added 075 HF drivers. John
    http://www.lansingheritage.org/html/...s/1957-c40.htm
    Here is the cabinets I made. John

  6. #6
    Senior Member demon's Avatar
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    I think will use a low power integrated tube amplifer or SS class A.
    i would use something high-power. in my ears (heart), headroom is clearly audible. no matter about needing it...
    (alone the word "low-power" makes me kinda sad)

    hope you have good results soon.
    and dont forget the pictures!

    cheers,
    mikey

  7. #7
    Senior Member spkrman57's Avatar
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    I have to disagree about the power needed...

    I am a fan of Single-ended tube amps and with 130A and 2420 cd on horn is close to 100db/watt.

    How much power do you need for the typical home environment???

    My amps are less than 8 wpc and still reach over 100db levels in my living room!

    Just my 2 cents worth of course!

    Ron
    JBL Pro for home use!

  8. #8
    Senior Member Beowulf57's Avatar
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    Quote Originally Posted by spkrman57 View Post
    I am a fan of Single-ended tube amps and with 130A and 2420 cd on horn is close to 100db/watt.

    How much power do you need for the typical home environment???

    My amps are less than 8 wpc and still reach over 100db levels in my living room!

    Just my 2 cents worth of course!

    Ron
    Yup...I run my back-loaded folded corner horns with D130, LE85/HL92, 2405H and with a measured 1 watt input, most people want to leave the room...and that's peak power, not average. Now if you have an enormous room, you may want more. My mono-block tube amps run fully balanced from input to output, Class A, with tube regulated power supplies and use DHT's (6B4G's) in a PP configuration. Probably good for around 12-15 watts, but I've never used the headroom, though it's good to have it.

  9. #9
    Senior Member jcrobso's Avatar
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    How are you measuring the power?

    Quote Originally Posted by Beowulf57 View Post
    Yup...I run my back-loaded folded corner horns with D130, LE85/HL92, 2405H and with a measured 1 watt input, most people want to leave the room...and that's peak power, not average. Now if you have an enormous room, you may want more. My mono-block tube amps run fully balanced from input to output, Class A, with tube regulated power supplies and use DHT's (6B4G's) in a PP configuration. Probably good for around 12-15 watts, but I've never used the headroom, though it's good to have it.
    Keep in mind that for every 3db increase in SPL the amp power in doubled.
    1 watt becomes 2 watts, 2 watts becomes 4, etc.
    In music listing we care about the peaks, even thought the average may be one watt, a 10db musical transient needs 10watts of power to be reproduced accurately. You may be using your heard room more than you know. John

  10. #10
    Senior Member spkrman57's Avatar
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    No problem for me!

    I found my typical average wattage for normal listening to be using about 1/2 wpc.

    So I guess with 8 wpc I have sufficient headroom.

    At least I know it sounds good to me. And definitely sounds better than using SS amps with 10 times the power capability.

    Ron
    JBL Pro for home use!

  11. #11
    Senior Member Beowulf57's Avatar
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    Quote Originally Posted by jcrobso View Post
    Keep in mind that for every 3db increase in SPL the amp power in doubled.
    1 watt becomes 2 watts, 2 watts becomes 4, etc.
    In music listing we care about the peaks, even thought the average may be one watt, a 10db musical transient needs 10watts of power to be reproduced accurately. You may be using your heard room more than you know. John
    Nope...as I noted the 1 watt was peak...average was around 120mw (using a min/max/average reading digital multimeter spec'd to 20KHz).

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