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Thread: Projects in Rummelland

  1. #16
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    Radian 1225-16

    Hello again,


    finally I got my hands on some Radian 1225-16 so I grabbed the 2426 and changed the dias,
    mounted them to the 2344 and made some measurement.
    Enough nice being said about the Radian dias, so I found a nasty peak just below 4k.
    My question here is could that be related to the back chamber?
    Comparing to the Fostex FD600 the damping is placed different.
    Right on the back cover the JBL and on the dia mount by the Fostex.
    Any suggestions? Can that peak be solved by damping?
    Would like to know before heading for a R-C link. Get the basic right at first.
    Also looked for xovers but that seems a stoney field to dig.
    The l-pads of the 4430 were just a bit to much to look at, is there a simple solution known?

    thanks in credit Roger
    looking for a JBL 2346 horn

  2. #17
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    simple 4344/45 xover needed

    Hello today,


    I found the issue for the peak in messurement of the 2426 with the Radian dias,
    The adjustment was incorrect. The other driver didnt have that peak
    so I keept searching, adjusted the one dia a little bit better and the peak is gone.
    I call that a win, problem solved.
    Sounds nice!

    The 2202 got a smaller doghouse and a highshelf with the dsp at the lower end.
    But taking the subs a bit to high, 160Hz, gives that sonor sound to voices in the lowend that I like.


    For future projects I am collecting some driver in the shelf.
    Got some stuff to build a 43XX monitor, not sure wich one.
    44 or 45 but while having the 2245 my only 15" is a K140 ready to be reconed.
    If I do it right the outcome will be a 2231a and not the 2235 needed for the 4344,
    wich monitor used the 2231a and wich components do I need for that one?

    Right now I'm waiting for some dustcaps to finish a 2122 recone what would lead to the 4345.
    Giving me the next question, wich one will feed my favour of sound.
    Is there a simple xover without lpads and charged C to get an idea? Those lpads get me puzzled.
    Had a messurment on the 2425 with the 2307 and was amased by the flat response.
    Gonna build a quick and dirty assemble to arrange the three driver to the upper end.
    Bass will be a front loaded Phonogen horn driven by a 2012h.
    2122h in the front with the 2425/2307 and the 2405 in a simple frame on top.
    Just for the fun and because its there. Need xover on that, would spare me a lot of work.

    So if anybody could help with that I will put some pics up sone. Thx
    looking for a JBL 2346 horn

  3. #18
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    2251j

    Hello again,

    awaiting some JBL 2251J to come.
    Planing to put them together with a 2450 on a 2380 in a pseudo de'appolito.
    planned xover is 150 to 200 for the 10" to the bass and about 700 to the horn.

    Has anyone yet tried the 2251 in a closed cabinet or the 2380 with de'appolito?
    Any tipps and tricks about this?

    thx in advance
    looking for a JBL 2346 horn

  4. #19
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    Hello,

    Trying to give a short summary about some speakerstuff that happend since last year.

    Last notice was the JBL2251 in de'appolito with the 2380 and 2450.
    Well I build that one but somehow I didn't like it that much.
    Maybe I missed the last steps in development to make it better.
    Anyhow, disassambeld and stored away.
    Have a picture.

    Name:  JBL de'appolito.jpg
Views: 213
Size:  263.2 KB


    While that project didn't last very long I tried something different.
    The parts seemed to apear one by one just right in time.
    JBL E145 for the low mids, BMS 4594 for the EV HR9040 that horn itself
    and an additional 2404 Tweeter were all on the shelfs of some friends, elfes so to say.
    Even the enclosure was given to me by the company I work for.
    Just some 40 x 60mm wood for stiffening, screws and of we go.

    Take a look.

    Name:  E145+HR9040.jpg
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Size:  98.6 KB
    Attached Images Attached Images  
    looking for a JBL 2346 horn

  5. #20
    Administrator Mr. Widget's Avatar
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    That something different looks pretty serious! How do they sound?


    Widget

  6. #21
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    Hello Widget,

    The summe of some great components doesn't automatically turn out to be a great result.
    Most of us know that in one or the other way, nothing new here.

    That said you might allready guess I'm not done by now to my own satisfaction.

    There are two Cabasse 55nds 22" Subs in a sealed enclosure (-3fs at 44 Hz, the rest is roogain 6m - 30Hz by 11m - 17Hz)
    for real bass behind the curtain, seen in some picture before.
    Those are set and only to be replaced by 4 of em if I get my hands on some.

    The JBL E145 are only used for mid and upper bass, they got a sealed enclosure of 44 liter each,
    what will give them fast response from about 100Hz up.
    So the box under the horn got round about 100 liter, pretty slim and close to the wall. Xover here is at 90Hz.
    I love those drivers for what they are and the crispy sound.
    The lag of bass is compensated with the subs mentioned above.
    Might be a bit overdone but there is always something to complain about.

    The EV HR9040 is a really nice looking unit imho. Glossy, shiny and a joy to look at.
    Heard them before in some other setup and found nothing bad.
    https://www.flickr.com/photos/_hb/48...7710311019592/
    Glorious days back in the monestary.
    They were painted black in the picture but I removed the spraypaint and got them back to white.
    The driver on there back is a BMS 4594 wich gives those horns a pretty flat output.
    The BMS is only used for midrange without the tweeter.
    Dont like that inside tweeter and an additional tweeter, the 2404 set at the front is obviesly doing a much better job.
    In the picture it's another one but you may have noticed the JBL in the background.
    The BMS midrange works up to 6,3k where it drops down by itself, thats where the 2404 sets in.
    Nothing bad there I might guess. Thoug some say the BMS is crap. I'll count your votes about that statement.

    All this stuff is driven by lots of power. 1250 watts in total per side. 500+500+250.
    Not completely aktiv, got only three amps per side so the tweeter is passivly added on top.
    All the signal is devided by a minidsp, 2x8 if I remember right.


    Back to the missing satisfaction and information in the text.
    The horn starts to load at 350Hz and there will be the problem of my shere will and the physics I'm trying to ignore.
    To say it elsewise, where are your experience and advise to set the crossover?
    Anybody please who is familiar with this horn.
    Some voices sound honky, if I try to peak down some frequency by equelizer the honk is gone but the clarity as well.
    Thougt already about mounting another driver.
    Tryed the EV DH1AMT but havn't been so happy and can't push myself yet to buy the 2451 and give it a try.
    There are some old aluminium dias for the EV DH1, maybe they are better in this application.
    Would have some dias for the 2451 as well.
    Lots of ways to work on, get lost, spend time.
    Spending time on this is not so bad though.
    There is some punch in these speakers, some drive to give you a kind of stupid smile.
    Bathing in the sound of music.



    For those who have that question in mind.
    My wife is forcing me to get them out of the room. I will have to for xmas. Unfortunatelly.
    But they will be back.
    looking for a JBL 2346 horn

  7. #22
    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by rogerjulien View Post
    The summe of some great components doesn't automatically turn out to be a great result.
    I know that only too well!

    Quote Originally Posted by rogerjulien View Post
    For those who have that question in mind.
    My wife is forcing me to get them out of the room.
    …and I repeat myself.

    What is your crossover frequency between the EV horn and midbass drivers?


    Widget

  8. #23
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    The x-over between midbass 15" and EV horn is 444Hz.
    looking for a JBL 2346 horn

  9. #24
    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by rogerjulien View Post
    The x-over between midbass 15" and EV horn is 444Hz.
    Have you tried bumping it up to 600-700Hz? That might help with the nasal quality you mentioned.


    Widget

  10. #25
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    Thats a high xover for a horn that big, the mouth is more than half squaremeter.
    Or do you mean just to isolate the honky sound?
    looking for a JBL 2346 horn

  11. #26
    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by rogerjulien View Post
    Thats a high xover for a horn that big, the mouth is more than half squaremeter.
    Or do you mean just to isolate the honky sound?
    I have not used that horn, but I have used quite a few and as a general rule have found they sound best when crossed over 1-1.5 octaves above their cut off frequency.

    Most manufacturers rate their horns at half an octave above their cut off frequency… So doubling the frequency that they are specified for often works well.


    Widget

  12. #27
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    Yes you are right Mr.Widget, thats a common rule for horns.
    Your input is much apprichiated. ManyThx.

    Just to state myself:
    The horn starts to load at 350Hz and there will be the problem of my shere will and the physics I'm trying to ignore.
    Having a horn that big I'm trying to push the lowest possible xover out of it.
    I raised the xover slightly above 500Hz and choose steeper filter, 48dB.
    Raised the E145 in volume and at least it sounds different. (I will say better)

    Will have to start some measurements to do it correct.
    looking for a JBL 2346 horn

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