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  1. Replies
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    Crown cdi drivecore 4 300

    Hi,
    I just bought one... indeed it is presented as "cost effective", BUT I got the 4 300 model which mean I can have:
    - 2 times 300 W
    - 2 times 600 W
    - or 4 times 300 W for either simple bi...
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    can it be that each pot hit a different frequency...

    can it be that each pot hit a different frequency produced by the same driver like 8k and 16 k ?
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    N 3124 crossover restoration

    Hi,

    I d like to give my 4425 a fresh start. i will change the pots that do not perfom as they should (little tricky to undo the plate of the knobs at the front without damage), and I think I...
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    Hi Richard, I can t beleive the bastard who...

    Hi Richard,

    I can t beleive the bastard who did the french soft got the driver 's volume so wrong ! I have to blame myself for taking it for granted.... for the cleats I used very few of them but...
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    I think my wrong TS parameters are responsible...

    I think my wrong TS parameters are responsible for the difference between calculators and reality... Here is a simulation with as much as stock TS as I could fit in and as much as my measured TS to...
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    My actual Vb is 72.5 liters.... sorry... I...

    My actual Vb is 72.5 liters.... sorry... I rounded up a bit the heigth advised ..., in fact I got 73.5 liters but i have to substract 1 liter (not substracted in my 1.3 L that are actually 2.3 l),...
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    “Issue # 1 Take a break” : Yes, I will take a...

    “Issue # 1 Take a break” : Yes, I will take a break....!
    I did read your post
    Yes I had the sad feeling that I wen't from one wrong Vb to another.... allthough respecting the caculator rather...
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    sorry it s the following of the previous post as...

    sorry it s the following of the previous post as i coudn't upload anymore...: please read post 5 first...
    I coudn't get the 52 L box to have the 50 Hz and 100 Hz match yet as the smaller vent i...
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    Hi Richard, "If my memory is correct, the box...

    Hi Richard,

    "If my memory is correct, the box picture from your previous 2214 Thread on similar issues, did show ducted ports at the bottom of the cabinet near side walls ? This would tend to...
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    thanks Earl ! I am happy with the small box ? I...

    thanks Earl !
    I am happy with the small box ? I don't know! It s been a while since I haven't listen to the 4425, it seems the 52 liters boxes are giving a slightly deeper bass.... not worth the...
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    Box tuning question

    Hi,
    I am still exploring box tuning with some 2214H.
    The first box of 52 liters has been built with the JBL TS parameters, and calculated with a french software. The Vb has been decided by the...
  12. Thanks Lee I do use Rew for the measurements you...

    Thanks Lee I do use Rew for the measurements you see.
    Just did not want to make the small circuit they suggest to measure TS parameters: not shure to do i right , afraid to blow my drivers, coudn't...
  13. Thank you so much ! Indeed I felt like lost in...

    Thank you so much ! Indeed I felt like lost in the middle of the sea with just a tiny buoy thrown by Mr Widget...

    An other great advantage of this method is that one doesn't have to take the...
  14. Reading lessons

    I should take reading lessons before getting into this.... I understood that the null was at the crossing of the two FRC :banghead:

    well, that made me cut a lot of plastic.... but here we are 29.5...
  15. Well, the close measurements did not validate my...

    Well, the close measurements did not validate my calculated 29.5 Hz tuning frequency. So I started to doubt the french soft, and tried four different box simulators and none of them gave the same...
  16. Well, I performed some measurements without...

    Well, I performed some measurements without filtering, whether active or passive.
    First, a comparison of the same woofer in both boxes (green my box, red stock JBL 4425).
    The extra SPL is not due...
  17. Ho ! all right ! Measurements shall be made with...

    Ho ! all right ! Measurements shall be made with or without equalization-crossover of the woofer ?
    presumably without looking from the graph...but if so equalization will change the null point 's...
  18. PS; I don't think many designers actually adhere...

    PS; I don't think many designers actually adhere to the Altec ( so-called ) rule of holding the twin impedance peaks to the same magnitude.[/QUOTE]

    So I will have two peaks, and to tune the vent...
  19. thanks Mr widget ! I found it here:...

    thanks Mr widget !

    I found it here: http://www.audioheritage.org/vbulletin/showthread.php?12431-Yet-another-4425-DIY
  20. 2214h and impedance response for vent length thuning

    Hi,
    I have built boxes for my 2214H that are supposed to be tuned at 29.5 Hz
    I am now at vent length tuning. For this I am planning to measure impedance response (with a Dayton Audio DATS arriving...
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    there is no paradox because BOTH the newer 15"...

    there is no paradox because BOTH the newer 15" have trended upward AND because the speakers are tuned one octove above what the driver can do ? right ?

    Tonight I made a room curve with mini DSP...
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    Well that is enlightening, thanks. Could you...

    Well that is enlightening, thanks.

    Could you explain what these EBP frequencies mean in terms of FRC ? how do they relate to, say for the 2235H, the final 35Hz +/- 3dB written on the spec of the...
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    so be it... that is why I am asking... because I...

    so be it... that is why I am asking... because I do not know, and i make confusions....
    Well not much of an answer, still I would like to understand… if you please…

    I take for granted that:...
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    So it would be the tuning choice....the...

    So it would be the tuning choice....the box?...the crossover ? that would be at stake,not the woofers themselves?(-6dB at 38Hz)
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    How come you even participated in the thread ??!!...

    How come you even participated in the thread ??!! about the 4367:

    dallas Justice: I understand JBL choosing a bass reflex design but I an not a huge fan of resonating air, how do you find the bass...
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