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  1. Derek It depends how stable the 510M is at...

    Derek

    It depends how stable the 510M is at high power levels? Does it have VI current limiting or other protection.

    You know you can buy a superior Dayton sub plate amp with more power, dsp...
  2. I Rob, It could be the rang of the mass ring...

    I Rob,

    It could be the rang of the mass ring was above the threshold of your hearing....Lol.
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    Hi Todd, You make some interesting points. ...

    Hi Todd,

    You make some interesting points.

    The subjective awareness is going to depend on your associated equipment and your sensitivity to subjective differences. The ability to determine...
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    The I think you making an assumption merely...

    The

    I think you making an assumption merely based on a few posts in this thread where like opinion polling only those with a negative opinion post.

    There are hundreds of diy change coupled...
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    This thread is turning into a Seniors Moment.Lol.

    This thread is turning into a Seniors Moment.Lol.
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    Gregís system has evolved over time and is highly...

    Gregís system has evolved over time and is highly complex. There is a lot of skill and experience is setting up a system of this caliber. It sounds incredible. I think Greg now uses a bunch of...
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    Moved sideways. Not everyone would agree...

    Moved sideways.


    Not everyone would agree active is an automatic upgrade

    In many instances itís a sideways move depending on your preferences and budget
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    If you grab some Y rca connectors and run the...

    If you grab some Y rca connectors and run the high mid/ horn array direct from your preamp into the power amp that will validate if itís the Jbl crossover or the charge coupled network.

    These days...
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    I did some investigations into Biamping with...

    I did some investigations into Biamping with better /best quality capacitors and CC about 10 years ago.

    The upshot was that the bi amp active crossover can have the effect of an overall blanket to...
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    Okay. What active crossover are you using? ...

    Okay.

    What active crossover are you using?

    If itís an old Jbl 5234, 5235 or any of the other pro pa active crossovers itís not surprising.

    On the other hand are they equipped with oldĒ...
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    Well the difference with the Solen 250V Fast...

    Well the difference with the Solen 250V Fast Caps is plainly obvious.

    If you don't believe it nobody cares and no one gets hurt.

    Technically the steady state distortion measures a bit higher...
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    I think you will find The Widget is correct. ...

    I think you will find The Widget is correct.

    It’s more about the manufacturing process, tooling and labour involved to the create what these vintage drivers were back in the day. Do you know the...
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    Those were the days. I think l first heard a...

    Those were the days.

    I think l first heard a Jbl factory system at Encelís HiFi in Bridge Road Richmond. I initially heard the 4315ís around 1976.
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    Hi Derek, If you can arrange a 30 hertz sine...

    Hi Derek,

    If you can arrange a 30 hertz sine wave into the loudspeaker then run your hand around the enclosure to feel for leaks. That will identify any issues normally.

    You can download an App...
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    Try the 2123H with the 4344mk11 mid filter...

    Try the 2123H with the 4344mk11 mid filter schematic.

    Any other mid drivers will require the crossover reworked.
  16. Hi Phil, Its possible there is corrosion...

    Hi Phil,

    Its possible there is corrosion around the diaphragm screw down contacts in the faulty driver and or debris in the gap. When you get time have a look. The diaphragm may also require...
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    Without a pic itís hard to know. Btw adding a...

    Without a pic itís hard to know.

    Btw adding a sub into the system might be a good idea when you want to turn it up and cross the L150ís at a point that lowers the excursion on the woofers.
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    Hi Derek, As Chris points out have the passive...

    Hi Derek,

    As Chris points out have the passive radiator and the driver checked out.

    Itís possible that the system is being over driven or that the passive radiator is not loading the woofer...
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    Excellent

    Excellent
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    I agree. However the manner in which those soa...

    I agree. However the manner in which those soa drivers to sing together in JBLs systems calls for some ownership on the part of user as to how they set up and listen to these systems.

    I can...
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    Hi Martin, I don't see the necessity to...

    Hi Martin,

    I don't see the necessity to consider exotic driver (which are now NLA anyway)

    Consider this relatively cost effective arrangement which would go some way to mitigating the concerns:...
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    Thanks for the link, I had thought about...

    Thanks for the link,

    I had thought about getting a local shop to make them. With the current exchange rate they would be reasonable at your end.
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    That was 15 years ago and the rest is history....

    That was 15 years ago and the rest is history. Most of us have gotten old..LOL
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    There are several take outs at this point from...

    There are several take outs at this point from this discussion;

    1. Is the 4 way dead in the context of JBL? - original post
    2. Is a 4 way system featuring a specialised 10 inch mid or mid bass...
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    Hi Dome, I heard a similar style of system in...

    Hi Dome,

    I heard a similar style of system in HK recently which was a bi amped pair of DD67000 flanked by dual Wilson subs. It was a cool setup and was likened to listening to giant headphones...
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