Moose hotdogs!!! YUM!
Moose hotdogs!!! YUM!
One step above: "Two Tin Cans and a String!"
Longtime Alaskan Low-Fi Guy - E=MC² ±3db
I am thinking of 4671
2225 with 2425/2370 and I see 3110 xover I donot have.
I always have 5232 with 800 cards.
Please advise me otherwise.
link: http://www.jblproservice.com/pdf/Net...%20Network.pdf
One step above: "Two Tin Cans and a String!"
Longtime Alaskan Low-Fi Guy - E=MC² ±3db
Thanks to our all-seaching Zilch, I see this is an interesting bit of detail re: CD horn compensation. Actually, all this got me motivated to pick up a Behringer CX3400 active xover yesterday to play around with. I had a choice between the dbx or the Behringer and chose the not-well-regarded-due-to-infantile-failures Behringer mainly for the added features such as CD compensation and adjustable delay on the low freq. outputs, which the dbx did not have at the similar price point. I'll just run it continuously for the next few weeks to make sure it doesn't die on me.
Am playing with it now along with the 4507/2226H sub boxes underneath the Quad ESL63s but will swap in the 2380/2445J 16 ohm horns when I get the Mac MC-225 tubed up again in their stead. Zilch, I agree, these do sound surprisingly good with the 3160s. My original searches at LH seemed to indicate that I shouldn't expect much.
BTW, first thing I did was take the cover off the Behringer to inspect for possibilities of improvement. Yep, lots of extra space for a replacement power supply, which consists of your basic 7815/7915 +/- voltage regulators and what appears to be +/-21vDC voltage rails. Most everythng is surface mount on the board that houses the adjustment pots and control switches. I wonder what's involved to lay hands on the service manual - if there is one.
Should be fun......now, let's see...what's involved in setting up a reasonable calibration setup with a laptop/Presonus Firepod audio interface and some calibration software? I'll likely use an AKG 1000 or Rode mic.
Cheers,
David
It's the same drill. 3110A with HF boost.
http://www.jblproservice.com/pdf/The...eries/4671.pdf
If you look at the N4671 schematic, it's 3110A with max boost hardwired.
2370A is alledged not to require HF boost, but it's an underperformer (for Hi-fi, at least) without some compensation. Whether that's true for dance, I don't know, but JBL clearly added it for theater. You can easily build the 3110 equivalent I linked above and give them a try. Another option is to add a UHF "cluster" above the dance floor to provide "sizzle" if it's missing. I'd build that with the $9.90 PT waveguides (4) and use 2407, 2408, or the BMS equivalent nd tweeters. See JBL's Dance series design:
http://www.jblpro.com/pub/cspels/CBT4%205-5-03.pdf
Footnote: JBL used a similar hardwired 3110A network in 4660, initially with an 8-Ohm HF driver, but ultimately went back to 16-Ohm "J". I've posted pics in an earlier thread showing what happened. The note says "Please use D16R2425...."
http://www.jblproservice.com/pdf/The...eries/4660.pdf
http://www.jblproservice.com/pdf/The...ries/4660A.pdf
Footnote 2: A member recently worked out a compensated network for 2370A, detailed in another thread here. I've never built it, and don't know if it's appropriate for your application, but, again, as a matter of principle, you'll want to rebuild any vintage crossovers you might use, particularly in a professional installation, so building new may be the preferred option.
For HF comp, you'll want to use the FFBREQ cards, maybe. :dont-know
Thank you, 4313B. I believe that's where this is headed....
Thanks, folks. This is all I needed to get started on a new series of projects.
Cheers,
David
Thanks Mr. Zilch.
I have been searching the web and forum for more info.
A 3110 on the bay for $124 BIN, but not the A model.
Also looked for JBL M553 active xover. Not too many leads there.
I have considered a 4507 cab, filled with 2225/2226 low, 2425/2370 combo and 2405 uhf. I thought 3-way active with a m553 or dbx 234.
Call it good enough with a couple of double 18 subs underneath.
Does this get it done for the little dance floor?
I am visuallizing my L200b's with a slot concept mounted to the walls around the place. Just a good three-way full range job box that would take care of just about everything the dj's could throw at it.
Thank you!
Scotty.
One step above: "Two Tin Cans and a String!"
Longtime Alaskan Low-Fi Guy - E=MC² ±3db
Yikes, I think my thread has been high-jacked!
Anyway, I'm in Malaysia on business for a couple of weeks and it is good to see some discussion here on big HF drivers for home use.
So is a passive crossover at 500hz too low for a set up consisting of
2225 and 2445 drivers?
While dining on local curried fresh fish guts and pickled minced sprimp heads, I got to thinking about bi-amping this rig. I purchased a Denon 2200 and may use it with an older Denon 3300 reciever I have lying around that has separate pre-amp "outs," power amp "ins."
...any opinions on this idea?
Just drop in a low value cap with a low value inductor like the 4430/4435 or the L200B crossover. Use a resistor to set the level. You drop it in before the attenuation used to match the compression driver too the woofer level. Wayne adds a low value capacitor with the 2370 in systems he builds using that horn. Going to need measurements of the horn and compression driver.No thoughts on an LX5 (+HF boost) equivalent circuit? :dont-know
http://manuals.harman.com/JBL/HOM/Te...L200B%20ts.pdf
Rob
"I could be arguing in my spare time"
Consider it a "Sidebar." The principles are the same.
No, your chosen horn must support that low frequency, though. An advantage of large-format drivers is that they will play that low competently. Some here would advise that even 500 Hz is too high for any 15" woofer, and that you still need a midbass driver.
I believe we said that. You still have the HF comp issue to resolve for 2-way.
Well, spoke to the shipping company and my JBL 2350 horns are on their way to me from Belgium as we speak. I have the 2445 drivers (seems they measure around 12 ohm????).
I have two 2225 to use (both 8 ohm), and a pair of 2205 (both 16 ohm) if that would work better.
I am not sure if Zilch meant that there is already CD comp. in the good old LX5 filters? Do I actually need it with the 2445 on my 2350 horns?
Why isn't there any CD comp. in the 4673 (3115 x-over)?
I really would just like to build a simple 2-way x-over at 500hz with CD comp. myself (no L-pads please), but need a schematic to help me through.
This is an interesting thread now. Thanks for all the inputs.
----------------
If for some reason I shouldn't build a two-way, then I would like to use 2205 LF, 2482 MF on 2350 horns, 2426 HF on 2345 horns. and ,make a three-way .(I have all the parts, but thought that would be even harder to make x-over for??? and it really doesn't seem like anyone else has done that combination of drivers. x-over would be 300hz and 5000hz
Vernb
Last edited by vernb; 10-14-2008 at 12:51 PM. Reason: forgot x-over points
Robertbarsch-
Was the intended use ever expressed? (could make a nice SR or party speaker).
... or how large a horn can be accommodated? Not defining the horn or use, kinda
makes speculation on crossover design, moot (moose-meat?).
Vernb-
2350 doesn't need CD eq... it isn't CD, although you might want to boost the treble
or live with it rolling off w/2445. sort of wasting that 2426 on the 2345 using it above 5KHz.. ???
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