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  1. Thread: JBL L150-A Help

    by grumpy
    Replies
    6
    Views
    361

    So... 1) They were designed this way. 2) If...

    So...

    1) They were designed this way.

    2) If you want try to establish a certain absolute polarity, and you think you hear a difference, just swap the wires at the cabinet speaker terminals or...
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    Yes, ... for a bit there, I thought I had just...

    Yes, ... for a bit there, I thought I had just adapted expectations. :)
  3. Thread: Jbl 2421a

    by grumpy
    Replies
    2
    Views
    153

    Active experience? Only active with a stock 4430...

    Active experience? Only active with a stock 4430 with the passive MF/HF equalization intact and 5325 4430/4435 cards.
    Matching response curves and amplitude levels was fairly critical for the most...
  4. Thread: On Facebook

    by grumpy
    Replies
    4
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    423

    This is what you would see initially, for those...

    This is what you would see initially, for those interested (not an endorsement or recommendation):

    88717
  5. Thread: On Facebook

    by grumpy
    Replies
    4
    Views
    423

    Perhaps you can elaborate. Private Japanese...

    Perhaps you can elaborate.

    Private Japanese Vintage Altec fan page? Did you join? Was it worthwhile? ...

    In the future, it might be be helpful to at least minimally describe rather...
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    are you clicking on the little ‘Remember Me’ box...

    are you clicking on the little ‘Remember Me’ box next to the login fields?
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    404

    fiberglass? Cheap, readily available, works well...

    fiberglass? Cheap, readily available, works well and doesn't deteriorate. Used effectively in ported (open?) systems for ages. Could staple cheesecloth over it if there is a concern.

    Re...
  8. Replies
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    Cool to maintain that legacy system! Some folks...

    Cool to maintain that legacy system! Some folks really go for that kind of grill cloth too.

    Pictures are always appreciated. Personally, if I can learn something it's all good :)

    You'll likely...
  9. Thread: KM2

    by grumpy
    Replies
    318
    Views
    23,133

    Well, this thread has had some interesting...

    Well, this thread has had some interesting moments.

    When the Everest cabs eventually came into the picture, I thought ... cool, just build some Everests with 2216s a Radian BE and adjust to the...
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    Here's a bit of somewhat related reading fun: ...

    Here's a bit of somewhat related reading fun:

    http://www.princeton.edu/3D3A/MediaCoverage.html
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    Looks a bit like Altec boxes such as the Carmel...

    Looks a bit like Altec boxes such as the Carmel (quite possibly DIY) with a JBL load.
  12. Replies
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    I'll give it a go :) There are two channels (L...

    I'll give it a go :)

    There are two channels (L and R) brought to the six single conductor banana jacks:

    Left and Right channels are grouped in the two horizontal rows (of three jacks).
    The...
  13. Replies
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    11,248

    There was someone selling an equivalent item (as...

    There was someone selling an equivalent item (as stated by the seller) on ebay at one time (?) or perhaps contact member Edgewound for one of his.
  14. Replies
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    Personally, i’d leave the hole alone and not...

    Personally, i’d leave the hole alone and not worry about it.
    re alignment, if the adhesive is now completely ineffective, you could try thin, double sided tape... A sweep test will bring out any...
  15. Replies
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    I remember :D kinda quirky, but a nice option.

    I remember :D
    kinda quirky, but a nice option.
  16. Replies
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    11,248

    Yes, same lack of ribs on the aquaplassed 4"...

    Yes, same lack of ribs on the aquaplassed 4" dias. I bet they tried it. Probably dampened the upper freq tizz that the stiffened/ribbed diaphragms added to measurable and noticable effect, so why...
  17. Replies
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    11,248

    JBL did put aquaplas on these Ti domes... LSR32...

    JBL did put aquaplas on these Ti domes... LSR32 and 28. 053Ti ... don't know if that was instead of, or in addition to foam. :dont-know:

    Also, the residual adhesive on the 'plinth' is sufficient...
  18. Replies
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    Nice. You can see how squishy the foam is. Lots...

    Nice. You can see how squishy the foam is. Lots of good info!

    Congrats Grandpa Ken! :)
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    Sounds like a good plan. A few mm of 'squish' is...

    Sounds like a good plan. A few mm of 'squish' is probably safe, vs more for the original. But not being able to compare makes being conservative a likely wise move. Don't want to deform/damage the...
  20. Thread: KM2

    by grumpy
    Replies
    318
    Views
    23,133

    What happens behind the grille cloth, stays...

    What happens behind the grille cloth, stays behind the grille cloth? ;) Good luck with that here.

    I seem to recall Greg (at one point) had his system set up with 4 separate amps (one OEM/Pascal...
  21. Replies
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    127,272

    Straightforward layout, no nonsense, and a beefy...

    Straightforward layout, no nonsense, and a beefy power supply. Those switches are serviceable as well.
    Haven't heard one (or if I have, it was long enough ago that I can't count it), but I expect...
  22. Replies
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    924

    Wondering about 2216Nd as a current/serviceable...

    Wondering about 2216Nd as a current/serviceable replacement, possibly an improvement... seems like someone may have tried this in an L300 (not far off).
  23. I think Mike meant a filter to block the lowest...

    I think Mike meant a filter to block the lowest frequencies, ... a high-pass filter (on preamps there used to be a 'rumble' filter so turntables wouldn't feedback or put undue/inaudible LF into the...
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    A few things... 2231 recone kits have been...

    A few things... 2231 recone kits have been unavailable for quite some time. The suggested factory replacement (2235) kits -may- also now be unavailable... Perhaps you'll get lucky in either being...
  25. Replies
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    That should be fine. The charcoal pick&pluck foam...

    That should be fine. The charcoal pick&pluck foam from the same vendor might be worth checking too (nice sized chunks pre-scored). Whatever is used should compress -very- easily. The foam plug that...
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