Have-Good-Sound-with-your-beer-project...

[Charley Rummel]

Hi, Pangea:

Thank you for asking. As some of our members know, over the recent years I've been planning to build a pair of 4520's (the 2 x 15 version of the 4530). I've put a lot of research into the different versions of the 4520/4530 design which have turned up from varios sources, and I've also come up with some of my own improvements.

As for my two specific questions regarding the accoustic material in the compression chamber and the construction detail of the horn fold at the horn mouth on Ralf's creations, It's just a matter of curiosity. Even though we all agree that there are optimal materials available for accoustic treatment, for example, different individuals may have their own preferences, and they could be different from one another.

Also, there are a number of aproaches to constructing the horn curves. Ralf's aproach is a proven, effective and structuraly sound method of accomplishing the horn curve. Others have also succeeded with laminating thin panels together.

So, it's more data to consider.

Regards,
Charley

[pangea]

Hi Charley!

Are these improvments a secret or would you like to share what and how you have done it?

Also, which driver would you say is the most suitable, since I would imagine it hard to find a pair of K145's today.

BR
Roland

[pangea]

PS: I have a pair of 2220A in very good condition, would they fit you think? DS.

BR
Roland

[Charley Rummel]

Hi, again, Pangea:

The 2220 was once recomended by JBL for use in the 4520/4530; I think they'd work very well. Also, If you can't get ahold of a pair of the K145's, the E145 would also make a good choice if you can find those. The 2205 and the 2225 are good candidates as well.

As for my improvements which you asked about, I'd rather try them out first and make sure they're successful before I reveal them. For what it's worth, in the time I've been researching this project, I have yet to come across somebody else's plans which reflect with what's in my improvements.

Kind regards,
Charley

[Ralf]

..for all, who plan to build such brutally Horns. We had any problems at the party:

- Pictures were falling down from the wall and were broken.

- Glasses were vibrated from the shelf.

People reported of the fact that some women got a clarified face expression, when they sat down on the vibrating bar stools.

Greetings
Ralf

[boputnam]

Originally posted by Ralf
...some women got a clarified face expression, when they sat down on the vibrating bar stools.

Uh-oh...

Now I have ANOTHER project!

*****

But I gotta say, we had the closing of New Years here, on request of the neighbors, and boy how they boogied to the 4345's. Whoo-wa!

Greg Timbers and company really had something going back in the day. Wow...

[pangea]

Originally posted by Charley Rummel
Hi, again, Pangea:

The 2220 was once recomended by JBL for use in the 4520/4530; I think they'd work very well. Also, If you can't get ahold of a pair of the K145's, the E145 would also make a good choice if you can find those. The 2205 and the 2225 are good candidates as well.

As for my improvements which you asked about, I'd rather try them out first and make sure they're successful before I reveal them. For what it's worth, in the time I've been researching this project, I have yet to come across somebody else's plans which reflect with what's in my improvements.

Kind regards,
Charley

Thanks for your input, I'll keep this in mind.
I would have thought the 2227 be a candidate as well in that case, since it's quite close to the 2220, or isn't it!?

I can wait, I'm in no immediate hurry to learn about your experiences on the 4530, I guess I should move first. Some of my neighbors are already not so impressed with my speakers.

BR
Roland

[pangea]

Originally posted by Ralf
..for all, who plan to build such brutally Horns. We had any problems at the party:

- Pictures were falling down from the wall and were broken.

- Glasses were vibrated from the shelf.

People reported of the fact that some women got a clarified face expression, when they sat down on the vibrating bar stools.

Greetings
Ralf

Hi Ralf!

No need to warn me, I already know what they can do!

You see, that is exactly why I want to build me a new pair of 4530's some day, in the not so distant future.

In the seventies I was frequently hired as DJ on all kinds of parties, always taking my 4530's along and I have missed them more than once after having sold them to a friend in the early eighties.

BR
Roland

[JBLnsince1959]

Ralf:

I have a question about the girls at the party ( on the barstools). Was it the blond in picture #6 ( with her mouth open), or was it the girl with the yellow shirt in picture #8 - ha

Looks like they were "feeling" pretty good to me.

rick

[Alex Lancaster]

Hi:

We used a lot of our 4530 variants in the 80´s, for permanent disco installs, IMHO the 2205 and E140´s worked best, I would use 2226's today.

For the compression chamber, 1" fglass worked fine.

We used also "resonators", 8'x2'x1.6', 3/4" particle board, no bracing, with a 2205 inside, laid down as benches, and I guess they made people happy with a real kick at about 35 and (not to) 70Hz, cut off at 200Hz.

Alex.

[pangea]

Originally posted by Alex Lancaster
Hi:

We used a lot of our 4530 variants in the 80´s, for permanent disco installs, IMHO the 2205 and E140´s worked best, I would use 2226's today.

For the compression chamber, 1" fglass worked fine.

We used also "resonators", 8'x2'x1.6', 3/4" particle board, no bracing, with a 2205 inside, laid down as benches, and I guess they made people happy with a real kick at about 35 and (not to) 70Hz, cut off at 200Hz.

Alex.

Hi Alex!

Could you elaborate and be a bit more specific please? Particularly on "resonators", "1" fiberglass" (how and where) and on "benches".

You see, I'm like "Inga from Sweden", I'm also from Sweden and need to have it laid out in simple terms and most of us here do not even know about inches. We have always measured in millimeters.


BR
Roland

[pangea]

Hi again Alex!

I forgot to ask.
Why would the 2226 be better than the 2227?
Isn't the 2227 closer to the 2220 than the 2226?

BR
Roland

[Ralf]

Originally posted by pangea
Hi again Alex!

I forgot to ask.
Why would the 2226 be better than the 2227?
Isn't the 2227 closer to the 2220 than the 2226?

BR
Roland

In my own 4530 I also used the 2226HPL because the kick is a little bit smoother, but they have a enormous power reserve. You don`t blow it so quick...

I would not take fglass because of the wind velocity in the horn mouth particles are drug along. And that`s not good for your Lung in the long term...So best for me is Burl foam material.

And for all, who don`t know: 1" is 2,54 cm

Greetings
Ralf

[Alex Lancaster]

Pangea:

If You can understand my fairly horrible drawing, You can see that it is a Helmholtz resonator tuned to about 35Hz, with a 70Hz harmonic, if You sit on it, the vibrations will get to Yr derriere and associated parts, specially with that big "coffin lid" with no bracing, I can´t take credit for it, it was an in-house JBL trick, with scientific biological reasons.

About the 4530:

JBL recommended specifically the 2205 and E140, check out the 1980 catalog; You could use just about any 15" JBL, but the 2231 would be a waste, the length of the horn makes for about 80Hz, the 2220 and E130 did not kick so nicely at 40Hz, and the E145 was less efficient, remember we are talking disco, not Hi-Fi.

So the 2227 is of course more like a 2220, but We want "kick" don´t We?

The 1" fglass was used only on the chamber behind the woofer, not close to the throat; I guess batting would work too.

[Alex Lancaster]

I have been trying to post the drawing; I get a message that it is too big, I´ve posted color pics before and this is just a drawing of a box.

HELP, Alex.