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  1. Thread: Sub18

    by Robh3606
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    9
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    643

    Hope there are no stairs involved! Rob:)

    Hope there are no stairs involved!

    Rob:)
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    Yeah I have had similar experiences the separate...

    Yeah I have had similar experiences the separate stand alone amps seem to do a better job!?

    Not sure why?

    Rob:)
  3. Thread: 305P MkII

    by Robh3606
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    2
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    252

    Have a pair of 308P Mk 2 and like them as well....

    Have a pair of 308P Mk 2 and like them as well. Where do you have yours? Mine are used in my office system with a subwoofer.

    Rob:)
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    Hello Rusty Well that is a conditional...

    Hello Rusty



    Well that is a conditional statement that depends on how the woofers are set-up. The Everest only uses the second woofer up to 150Hz so no issues. Now if you ran both woofers over...
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    Hello Heather Have you ever tried a demo...

    Hello Heather



    Have you ever tried a demo with them? I guess it's important what you want to use them for. I did for HT and it's not realistic at all in the sense that you get way too much...
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    It does and if you have any doubt listen to a...

    It does and if you have any doubt listen to a 4311/L100 vs. 4410/L80t as examples. The 4311's are not mirror imaged and not aligned and the imaging suffers compared to the mirror imaged and vertical...
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    I am a little confused as well by your question...

    I am a little confused as well by your question as it gets a bit complicated. As Mike said no DSP will take a signal at the level even from a high output MM not getting into MC. For it to happen you...
  8. When I did my 4344's JBL still was doing cone...

    When I did my 4344's JBL still was doing cone kits so I was able to new 2122's from the tent sale and cores and re cones for 2235's. Now I would never start down that road with no more kits.

    Rob:)
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    Odd have to see which ones they were, that horn...

    Odd have to see which ones they were, that horn could be set-up for a 1" driver different throat. Any of the modern large format driver like the 2450SL, 2451/2452 should work just as well as the...
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    Why would you have to rescale the horn? All you...

    Why would you have to rescale the horn? All you are changing is the throat. You could just rescale the throat and leave the horn be as they are separate in the original design. You would also need to...
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    Hello Toddalin That's why it's best to try...

    Hello Toddalin



    That's why it's best to try on a simple 2 way system to see. When I built my CC L250 Jubilees and 1400 Be Arrays it got very costly compared to a standard network.

    Rob:)
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    Yes The 2" throats had a decades old...

    Yes



    The 2" throats had a decades old flare rate. The new throatless design is actually supposed to reduce distortion. There is a Technote about it
    ...
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    They are identical difference being throated vs....

    They are identical difference being throated vs. throatless. Drivers like the 2450 vs 2451 are a perfect example same phase plug the 2450 has the typical throat with a recessed screen. On the 2451...
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    Hello Derek It's 250 per channel? If so no...

    Hello Derek

    It's 250 per channel? If so no problem they will be just fine. I use a pair as subs for my mains in my HT using a Crown PS-400 @ 200 per channel. I know they recommend minimum of 200...
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    The K145 and E145 are short coil log gap so the...

    The K145 and E145 are short coil log gap so the coil is 100% in the gap even at extremes. The E has significantly longer xmax about a 3rd more. You are going to end up with a very thick top plate and...
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    I use 3/4" fiberglass acoustic sealing tiles. ...

    I use 3/4" fiberglass acoustic sealing tiles.

    Rob:)
  17. Have you called JBL Technical services? Or gone...

    Have you called JBL Technical services? Or gone through the trouble shooting guide in the manual?

    Rob:)
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    As always great work! Rob:)

    As always great work!

    Rob:)
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    I should probably replace mine as well! Rob:)

    I should probably replace mine as well!

    Rob:)
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    4,823

    Hello Grumpy I tend to agree. If you look at...

    Hello Grumpy

    I tend to agree. If you look at it as AC vs DC the AC is high passed through the caps while the DC is blocked. Capacitors will discharge the DC through a ground at a rate of C X R =...
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    Hello Kay Well here is what GT thinks on...

    Hello Kay



    Well here is what GT thinks on that point.



    So I would try it before just blowing it off based on any pretense of superior capacitor quality. Some of the JBL CC networks use...
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    Try it in a simple 2 way design like an L20t3 or...

    Try it in a simple 2 way design like an L20t3 or 4406 and decide for yourself.

    http://www.audioheritage.org/vbulletin/showthread.php?3555-Bypassed-and-Biased-Capacitors


    Rob:)
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    What you may not realize is that system came out...

    What you may not realize is that system came out 3 years before the first CD player in 1982. So 1979 40 years ago. There is a big difference between the low end on a typical Vinyl record which was...
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    JMHO but what I'm seeing in some of these videos...

    JMHO but what I'm seeing in some of these videos is blatant abuse. You should never run drivers that hard especially vintage ones where parts are scarce or unobtanium. Get a sub if you want to run...
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    H's Rob:)

    H's

    Rob:)
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