JBL Open Baffle & Horn speaker OKOB

[oks81]

Hi!

Never heard ripol, nor slobs.
Think both get pretty big (stacking) also if wanting high enough level an low distortion.
But don`t have to be so wide as normal OB.

 

[hollowboy]

I like the idea of nearfield ripol subwoofer in small spaces and where neighbors are concerned;

Never heard ripol, nor slobs.
Think both get pretty big (stacking) also if wanting high enough level an low distortion.

I've never heard a ripol either, but in theory I like the idea of a nearfield sub.

If your main speakers are 2m away, and your nearfield subs are 0.5m away, the sub can play at -12dB relative to the mains, for a similar subjective SPL.

That seems like a huge advantage.

Many variants of OB or pipe have LF cancellation at large distances from the source, normally seen as a bad thing or sub use, but for nearfield use = not a problem, actually a benefit. A nice way to have subs and also have happy neighbours.

 

[oks81]

Two years and som changes later....

TAD 4002 on the 2360`s.
JBL 2220 upper bass, JBL 2227 lower bass.
JBL 2405 playing backwards.

DEQX HDP3 as DSP.
Musical Innovation 2x15w class A amp for horn.
Midgard Oberon 4.1 for the bass.

Tweeter just added with the horn, with a 0,5uF capacitor in series.
22uF capacitor for protection on the TAD 4002.

 

[Mattes]

Hei Oks,


Cute and nice little speakers! Hope the neighbours like them, too!


All the best


Mattes

 

[oks81]

Thanks Mattes

Yes they ar compacts, only 80cm wide..
Bought earplugs to my neighbour...

 

[6thplanet]

Why did you ditch the OB set up for ported cabs?

 

[oks81]

Because I wanted to test it.

Got a bit deeper bass.
The stack is lower so the horn is in more correct height.

Drawback: Can`t use passive filters, must have DSP as the JBL basses in these cabinets need EQ boost in the bass.

 

[Robh3606]

JBL 2405 playing backwards.

Hello

So how low are you running them??8K or so?? Do they add much as far as space??

Rob

 

[oks81]

With 0,5uF cap 2405 start rolling of at about 9khz.
Can`t really say to much about it, maybe som ambience is added
Helping the 2360`s beaming over 10khz.

Edit: Tested now on same song with tweeters on and off, there is a little difference, more air in the top with tweeters.

 

[Robh3606]

Thanks!

 

[jmpsmash]

Interesting. And very nice!

Why 2405 backwards? how good are the 2360's imaging? 2405 pointing forward should enhance imaging, how does it sound when backward and integrated with 2360?

 

[oks81]

Sorry for late reply!

The 2360 imaging is very good. The idea with 2405 backwards is as Ambient Tweeter.
Filling in the area >10k where the 2360 start beaming.

One of the 2405 diaphragms got broken they are old.
So got a pair of JMLC 1400 and Celestion CDX1-1430 instead.

Also have worked with crossover in DEQX and got it down to 500hz between woofers and 2360.

 

[oks81]

GPA 515 lower woofer.
Reconed JBL E140 with black dustcap and gaskets as top woofer.

 

[carlthess40]

Very nice setup

 

[oks81]

Thank`s

 

[zmyrna]

shouldn`t the GPA be on top? (lighter cone)

 

[oks81]

I think the 515 has 90g mms?, and the E140 is 94g.
This is not much difference.

I just put this way because it looks better.

 

[mikey_audiogeek]

Here is schematic of mye diy amplifier.

It is quite inefficient. I have to use an 8ohm resistor on the speaker output to get it sound good with my speakers.

I think this will bring about 2w to each speaker.....
It is enough for normal listening
Gain is also quite low.

Afraid of blue LED`s? I use 1Mohm in series with the blue LED`s and it`s quite ok.

The goal of the amp was building something that need very few parts.
The chokes cost some money though....cheaper to build FW F2.


On the positive side the chokes bring down the temperature.

Nice. I bought some Lundahl chokes to build something similar but you beat me to it!

 

[oks81]

It`s fun to make something so simple that at same time can sound good
Is best on efficient speakers.

 

[Studley]

@oks81: Your earlier set up is of interest to me as I have plans to combine horns and OB. I have some Joseph Crowe ES290 biradials and below them I’ll be using some AE Dipole 12” woofers (up to 4 per side if needs be). Fostex T925A to play above the ES290s. So I was pleased to read your comment that the OB and horns work well together.