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  1. Replies
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    Foam out. Soft wool felt in. 86237

    Foam out. Soft wool felt in.

    86237
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    Hi bubbleboy76, Thank you. I agree, I would...

    Hi bubbleboy76,

    Thank you.

    I agree, I would turn them in more if possible.

    The sides are both angled both inward and downward as much as the wall mount allows, please see better picture...
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    Off the wall.....

    The room is about 5x8m and pretty decent when it coems to modes. 2x JBL SUB1500 subs do low end duty, one at the font of the room and one at the back.

    Electronics is still same old fully digital...
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    In duty

    Here are a comparison between the old and the new. Slightly bigger but still acceptable by the Government.

    86223
    86224
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    And 045 & total

    Here are some measurements of the 045 on the K2 S9900 horn incorporated into my butchered M2 horns.

    Also attached is a system plot on the full system.

    All these curves are taken outdoors on a...
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    Some data for Be's

    Here are some measurements for the 2451Be's in cabinet on my butchered M2 horns.

    No smoothing and please check scale change.


    1. Far field 6ms 154cm outdoor
    2. Far field 6ms 154cm with EQ...
  7. Replies
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    Time for some update

    The curve for the 1400PRO, even in such small cabinet, is pretty encouraging. Not much bass however. I do XO at 80Hz to the subs.

    Here are some measurements

    1400PRO in cabinet

    1. Nearfield...
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    Hi Jeff, What filter settings did you finally...

    Hi Jeff,

    What filter settings did you finally use?

    Kind regards
    //Rob
  9. Replies
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    Short update. Sorry bubbleboy76, no spare...

    Short update.

    Sorry bubbleboy76, no spare 045's. Check with LN.

    Ivica, I have not gotten so far to figure out XO yet. The 1400PRO is clean to about +1200Hz so I might potentially increase to...
  10. Replies
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    Hi, I agree, it is a bit odd that these new...

    Hi,

    I agree, it is a bit odd that these new drivers also seem to be "reverse polarity". Attached is the pulse response with reversed polarity, ie positive puls into negative connector. Lower is...
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    Good friends allways help :-) Today was a...

    Good friends allways help :-)

    Today was a good day. After +5 years the fronts are finally done, except for the cloth on the fronts.


    Thank you Mr. J for the 1400PRO’s. And big thank you LH...
  12. Replies
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    A good friend came to assistance. A brand new set...

    A good friend came to assistance. A brand new set of 1400Pro’s. Nice. Big thank you to Mr J!

    85716
    85717
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    Thank you for the kind words. All diaphragms...

    Thank you for the kind words.

    All diaphragms centered and measured.

    A bit of a setback today. The two 1400PRO I have had on the shelf for many years waiting for this turned out to rub. They are...
  14. Replies
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    Hi sguttag, Good that you can confirm that....

    Hi sguttag,

    Good that you can confirm that. Puls patter from the D2 driver is definitely reverse, ie positive voltage on the minus pole creates pressure at the driver exit.

    In M2 there is a 6db...
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    Did some sanity measures today before the drivers...

    Did some sanity measures today before the drivers goes into the cabinets.

    Everything calibrated and checked against known ref.

    I measured 3pcs of each and will use average for DSP filter...
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    Hi Pos, I can post some comps next week. It is...

    Hi Pos,

    I can post some comps next week. It is odd indeed.

    I'm stuck on the old Crows CTS series class AB amps, fed from my BSS BLU800. They are as good as any with an odd topology used in...
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    Hi Pos. I have no idea why the 475Nd dia's do...

    Hi Pos.

    I have no idea why the 475Nd dia's do measure "better" than other SL diaphragms in the 2451 cores (in my opinion) They are from the older K2 475Nd 2” driver, but the SL diaphragms should...
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    Just got my hands on two "Holy Grale" diaphragms...

    Just got my hands on two "Holy Grale" diaphragms in the form of 2pcs NOS original "Northridge" D16R475Nd. Great. They are not for this build but in my opinion the best dias for the large format 4"...
  19. Replies
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    Beryllium drivers installed. UHF will get...

    Beryllium drivers installed. UHF will get protection caps but drivers only an attenuator.

    Tomorrow they are going into the cabinets.

    85671
    85672
  20. Replies
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    Hi Ivica, The impedance of the “naked” D2 does...

    Hi Ivica,

    The impedance of the “naked” D2 does indeed shift quite a lot over the range. The passive filter does really matter as can be seen in the plots below.

    All is D2/2430K marked “M2”...
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    Huge plans to cover some ground during the...

    Huge plans to cover some ground during the holidays was abandoned in the same pace they were made.

    At least the cabinets are now reinforced for wall hanging and wall mount cups for left and right...
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    Posted iTech M2 DSP parameters are not correct for BSS DSP

    With the help of a fellow JBL nerd, we have come to conclusion that the M2 DSP parameters kindly posted earlier in this thread are not correct for BSS DSP units.

    They are probably taken from a...
  23. Replies
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    Hi sguttag, Please check on you factory filter...

    Hi sguttag,

    Please check on you factory filter to see if the input positive leand goed to the negative terminal on the driver. I would expect so.

    I checked the exploded view on the VTX F127F15...
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    D2 polarity

    Maybe this is already covered in this very long thread but I thought I would mention it anyway.

    The D2 (2430K) should be wired with reversed polarity, with the positive lead going to the negative...
  25. After checking the ”exploded views” for the VTX...

    After checking the ”exploded views” for the VTX F12/F15 I’m pretty shure the polarity is reversed for the D2 driver.

    This means that for all M2 clone builders the positive lead shall be connected...
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