4530/2397 2 way

[glen101]

Hi
I am new to this forum and would like comment on the following before I move forward. I am planning to build a pair of 4530s loaded with 2225s and a 2397 with a 2482 on the back, driven by a pair of Perreaux EXR2100 amps active cross over at 1k.
Other than building the 4530 box i have all of these bits. Would I need to add a slot on top? Would people recommend an alternatice bos to the 4530.
The environment is the lounge, approx 5m x 6m with 4.5m ceiling.

Appreciate any feedback.
I have also searched for 4530 plans on this site, what I have found is a bit sketchie.
Regards Glen

[yggdrasil]

You will need something on top of the 2397/2482 which probably will not be useful above 6K.

[matsj]

Send me a pm with your email adress and i will send you the drawings.

mats

[glen101]

You will need something on top of the 2397/2482 which probably will not be useful above 6K.

Thanks for the reply, if the 2482 driver was a later model with a higher frequency range, is the 2397 flair then going to limit the top end,
I guess what I am asking, will I still need to add a slot on top regardless of what compression driver I use.

Thanks Glen

[yggdrasil]

Widget have done some measuring:
http://audioheritage.org/vbulletin/showthread.php?p=96544&highlight=2397+response#post96544
http://audioheritage.org/vbulletin/showthread.php?p=35459&highlight=2397+response#post35459

You can study the graphs, but IMO you need a UHF driver when using the 2397.

[Mr. Widget]

Widget have done some measuring:
http://audioheritage.org/vbulletin/showthread.php?p=96544&highlight=2397+response#post96544
http://audioheritage.org/vbulletin/showthread.php?p=35459&highlight=2397+response#post35459

You can study the graphs, but IMO you need a UHF driver when using the 2397.Ooh that takes me back...:D

I wouldn't completely trust the plots in that second link... those plots were made by me days after getting CLIO... I wasn't fully up to speed and there are many ways to screw up a measurement even with something as bullet proof as CLIO. I am not saying that I know they are wrong... but I can't be certain that they are an accurate representation either. The first post shows plots that were properly time windowed to remove the influence of the room and were properly set up.


Widget

[glen101]

Thanks for the follow up, the graphs are interesting. The good news is I managed to pick up a pair of Slots. So now the planning to build the 4530s start. And to refurb the paint work on the compression drivers.

Many thanks Glen

[glen101]

I had planned to have a 2397 on top of a 4530, but to day by luck I came across a pair if 2390 (2309 + 2310) throat and lens.

I am interested in peoples thoughts re 2390 vs 2397. the 4530 will have a 2225 in it and a 2405 for HF. The room is approx 5m x 5m x 4m.

I also read that the 2390 requires a baffle, would 600mm x 300mm be large enough for this?

Regards Glen

[SMKSoundPro]

I just made a baffle board for my 2309 + 2310 hartsfield horns on 2440 drivers w/ 2440 aluminum diaprhrams. I also included a 2405 slot on top.

I was plaaning on setting atop my L200b cabints with the 2235 woofs.

I will run it 3-way active with a double 18 sub kicker.

Will post pictures of it tomorrow.

Scott.

[SMKSoundPro]

try this: http://www.lansingheritage.org/images/jbl/specs/pro-comp/horns-lens/page3.jpg

[SMKSoundPro]

Here's a pic.

[glen101]

Hi
Looking at a 3 way active split,
4530/2225 loaded
2390/2446 loaded
2405

I have noticed on some JBL boxes that have an internal passive x-over that can be switched out and configured Active, that the compression drivers are still AC Coupled. ie a 2446 has a 20uF bipolar cap in series. Is this best practice, understand it will never let DC go across the driver, but I assume would still pass a turn on thump if not soft delayed.

Does the roll off ramps and filter types matter much, what would people recommend for the above 3 way proposed.

Would you apply a high pass at say 30Hz to the bass driver?

Any ideas and logic behind them appreciated.

Regards Glen

[glen101]

Hi there
My 4530 boxes are nearly ready to commission, they are as follows:
4530 loaded with 2225
2390 horn and folded plate, 2445J 16 ohm
2405 slot 16 ohm.

The original intent was to go 3 way active, however I am now considering 2 way active, with passive x-over between the mid & top.

Any thoughts, suggested x frequency between the 2445 & 2405?

Are there any links to a suitable x-over design.

Regards Glen

[speakerdave]

. . . . Are there any links to a suitable x-over design . . . .

If you can do this, it would bring the best result: See GT's checklist in the last post, regarding the "ring radiator."

http://www.audioheritage.org/vbulletin/showthread.php?t=10613

[glen101]

Progress, with Box 1 almost complete.

[glen101]

hopefully with photo

[Doc Mark]

Hi, Glen,

Your speaker looks very nice, indeed! Well done, Sir! Did you mirror-image the 2405's? Also, I only see what appears to be two screws holding your woofer into the enclosure. Is that right? Might want to add a couple more, just for grins, unless you have the woofer glued in with something. It's amazing how screws can "unscrew" themselves a bit, in a speaker enclosure!;):) Again, very nice work. How do they sound? More photos, please, when you get time. Take care, and God Bless!

Every Good Wish,
Doc

[glen101]

Yep, Slots are mirrored, Baffle board for Lens still to be made, Base driver is now screwed in with 8 cap heads, the 2 screws were all I had on hand.
It will probably be 2 weeks before I can feed in any juice to hear what they are like as I am traveling for work this week and still have 1 more box to add the trims to.
Thanks for your positive comments, Will certainly post more photos.

Glen