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Thread: 2445J for midrange?

  1. #1
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    2445J for midrange?

    'Any idea on how the 2445J driver would sound for midrange, assuming Sub1500 LF, 10" 2012H mid-bass, and 2404H or 2405H for HF? Is 2" a little big for this? 'Any good horns to go with the 2445? I was thinking maybe 2380A or 2382A, but have also heard many don't think this type of JBL horn works well for most music, even though the specs look pretty good.

    'Still in search of the most appropriate midrange for the above combination of components...'would still like to hear more about the 2430H...(availability?).

    John

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    Re: 2445J for midrange?

    Just a reminder that the 1500 SUB / REVEL 15 driver is dragging around a 300+ gram moving mass which works out quite well in the VLF. If you like the way it sounds operating up into the few hundred cycles range then that's fine, but something with a wee bit less moving mass will probably perform quite a bit better.

    "Is 2" a little big for this?"

    No

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    Senior Member maxwedge's Avatar
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    John, your system's growing.
    I like my 2445's/2380's and I don't even have an UHF, yet. But maybe I haven't heard a good 2441 yet (or a upgrade to 2450's )

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    Mid-bass

    So, could you use something akin to the 2202HJ and lower the crossover point between the VLF and the MF? Or, do you really need something beefier in the LF, like a 2231H...?

    Widget and I have been going 'round about this scheme...
    bo

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    Re: Mid-bass

    "So, could you use something akin to the 2202HJ and lower the crossover point between the VLF and the MF?"

    I don't recall the 2202 being able to go low enough, maybe if you port it though... the 112/2108 and 2122 work fine in 0.4 and 0.5 cubic foot sealed volumes. I think the 2012 might work if you port it.

    "Or, do you really need something beefier in the LF, like a 2231H...? "

    2234H? E145? 1400Nd?

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    Re: Re: 2445J for midrange?

    Originally posted by Giskard
    Just a reminder that the 1500 SUB / REVEL 15 driver is dragging around a 300+ gram moving mass which works out quite well in the VLF. If you like the way it sounds operating up into the few hundred cycles range then that's fine, but something with a wee bit less moving mass will probably perform quite a bit better.
    Yeah - I was thinking of a little sub-cabinet, probably ported for a crossover in the 100-120hz range.

    John

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    Yeah, that could work. You'll probably have to go active since the upper hump would probably play hell with any passive filter.

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    Active has always been part of my plan, except for possibly the 2404/5H.

    John

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    Sounds kind of like what I want to do. I am thinking of a fourth order triamp scheme: SUB1500 to about 80Hz, then run my 2231A's at 80-800Hz (or maybe 1K if I install my 2307 horns). Then leave the 2420/2405 passive.

    My only concern is that running the 2231A up to 1KHz doesn't seem to be recommended. But maybe using 24 db/octave xovers, it may be okay, since it will attenuate the 2231A a lot more rapidly. Anyone have any thoughts/experience they'd like to share?
    Charles.
    Last edited by Chas; 03-19-2004 at 11:40 AM.

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    Senior Member GordonW's Avatar
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    Can't a new 2020 (the 12" version of the 2012) make it down to 100 Hz? I thought I remembered, those things having quite a bit lower f3 in a sealed box, than the earlier generation stuff (2202, 2123, 2118, etc). If so, that might work better. With a 2" driver on the mids, I'd think the 12" should be a pretty nice alternative, crossover points should work out fine up top...

    Regards,
    Gordon.

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    Originally posted by maxwedge
    I like my 2445's/2380's and I don't even have an UHF, yet.
    What else are you running with these? LF? Crossovers? If you can ever spare the time sometime, I'd really like to hear these in a real-world situation.

    John

  12. #12
    Mike Bates
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    I like the horn loaded 2123 with the 2440 and 2405. 180 hz tractix round horn for the 2123 250-1k, then 360 hz round tractrix 1k to 10k with the 2440 and the slots for the top. Also use 2220A's 50-250 in sand filled 60 cycle dipolar expo horns below the 2123's and 3 18" hornloaded subs for the bottom.

    IMO the big format compression drivers beg to be used in a fully horn loaded rig. Just using a 10 mid and a 15 bass direct radiator probably would be better suited for a 1" driver and no super tweeter. Plus it will take up less space and be a heck of a lot easier to integrate into your room.

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    Senior Member maxwedge's Avatar
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    Originally posted by johnaec
    What else are you running with these? LF? Crossovers? If you can ever spare the time sometime, I'd really like to hear these in a real-world situation.

    John
    You could probably skip a stone acrross San Pablo bay and hit my back window! Yeah come on over, I have tons of spare time.

    My system is : 2242 LF, 2202 mid and 2245/2380 hi. I could really improve it with an UHF, but unfortunately they arn't in the budget for some time. I add some eq above 12K and it sounds nicer. I think in my case the thing to do is to snag some 2440 diaphragms and a pair of 2405's, but I have to wait.

    I have a pair sub1500's also that will run under 80hz in 2-15 sealed box of about 4 cu ft. I chose sealed cause I don't like the looks of group delay I see in BB6P, so I'm going to try Giskards suggestion to cut with eq between maybe 50-80hz to even it out and then crank 'um up to match the rest of my stuff.

    I heard Mr Widget's sub1500's today and they do sound nice in 5cu ft and ported box's (ea spk=5 cu ft) but I just don't have anymore room for big box's.

    My whole system is run by a Mackie 1604VLZ pro board Rane 22b/23b crossovers and Hafler amps.

    You've seen this...look for my post.

    Scott

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    "I have a pair sub1500's also that will run under 80hz in 2-15 sealed box of about 4 cu ft. I chose sealed cause I don't like the looks of group delay I see in BB6P"

    Just a reminder that any EQ added also affects group delay.

    Here's a shot of the group delay properties of the JBL BX-63, a bit extreme for EQ on a 1500 SUB but it does show the effects. I would guesstimate any EQ desired/required for a 1500 SUB in a small sealed volume would come out about the same as porting. In other words, a ported 5 cu ft 1500 SUB system probably has no worse group delay than a 2 cu ft sealed 1500 SUB system using a dash of EQ.

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    Last edited by 4313B; 03-20-2004 at 08:18 AM.

  15. #15
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    Originally posted by maxwedge
    You could probably skip a stone acrross San Pablo bay and hit my back window! Yeah come on over, I have tons of spare time.

    You've seen this...look for my post.
    Ahh...now I remember. I'll drop you a line.

    John

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