JBL 2226 & Bi-Radial Horn DIY Monitor

[notengewirr]

hello,

i'm looking forward to build a big 'only' JBL based Studio Monitor.

I choose some parts like the 2226 bass ( 40-45Hz is enough for my taste)
and something like a Bi-Radial JBL Horn with big horizontally dispersion like the 2382A ( even in 120° horiz.)



i like the Bi-Radial because the have bigger /brighter sweep-spot listening positions.


Here are my 4425 with custom made stands ;-)





for the crossover i think about an digital LS Management like the BSS Soundweb London or the Elektro Voice DX 46 Fir Filter or something like this.



Making an unique JBL vintage walnut enclosure is no problem for me , because i'm carpenter ,look at my self made 'sub-contra-octave' Subwoofer next to the 4425 ;-)
For the generally design i will choose something like the big Strauss Monitor (I believe it has a JBL 2380 like Horn & Tad bass)




- so what do you think will be the best fitting JBL compression driver for my project ? ( yes i know perhaps there will be slightly 'roll-off' at about 16Khz like my 4425 monitors)
- who can suggest , or simulate me a near 'perfect' setting for the crossover,time align,cd-horn equalization, and whats the best compromise BR-enclosure for the 2226 bass ?

thanks in advance !

[ivica]

hello,

i'm looking forward to build a big 'only' JBL based Studio Monitor.

I choose some parts like the 2226 bass ( 40-45Hz is enough for my taste)
and something like a Bi-Radial JBL Horn with big horizontally dispersion like the 2382A ( even in 120° horiz.)
i like the Bi-Radial because the have bigger /brighter sweep-spot listening positions.

Here are my 4425 with custom made stands ;-)

Making an unique JBL vintage walnut enclosure is no problem for me , because i'm carpenter ,look at my self made 'sub-contra-octave' Subwoofer next to the 4425 ;-)
For the generally design i will choose something like the big Strauss Monitor (I believe it has a JBL 2380 like Horn & Tad bass)

- so what do you think will be the best fitting JBL compression driver for my project ? ( yes i know perhaps there will be slightly 'roll-off' at about 16Khz like my 4425 monitors)
- who can suggest , or simulate me a near 'perfect' setting for the crossover,time align,cd-horn equalization, and whats the best compromise BR-enclosure for the 2226 bass ?

thanks in advance !

Hi notengewirr,

It seems to me that you would be very fare away from hi-fi home listening system, but for disco...that is OK.
For home listening I will suggest 2441-AL original JBL diaphragm and 2380 (90deg) horn, so one day You can put a kind of bass driver, like 2245 (2269) or smaller (2235, 1501,) or TAD 160x, and leave 2226 as mid-bass driver...., so sep-by-step get home listening system...
oh, yes, I would suggest you to mount the horn outside the 2226 box, so you can easy change it (let say with something like A290 or TAD equivalent...)

regards
ivica

[pos]

Nice project!
I always found the big Strauss monitor looked badass.
They had to resort to that angled horn because of the narrowing vertical directivity of the flat biradial.
There are probably better horns out there for that kind of project, and 1.5" drivers are a better choice when it comes to directivity up high.
I would go with the horn from the SRX725 (I have one here, it measures really nice, on par with the PT waveguide but with a better form factor I think).

Regarding the crossover I have a DX46 sitting here doing nothing if you are interested. Its AES/EBU intput does not work anymore (failed to understand why) but other than that it is in perfect shape.

[notengewirr]

Hi notengewirr,

and leave 2226 as mid-bass driver....

ivica

oh ! now i calculated the TSP for the 2226 and you are right. The f3 will be around 60Hz, in a enclosure ca 75Liter and that is not deep enough.

[notengewirr]

all parts you suggested are not in actual production, so i have buy them as used...
If "money is no object" i would go for the Guido Behringer BLS Horn +Radian Truextent Beryllium & Beyma 15B100R/G-H.They called thier Box with 9V bias crossover "Hornblower 15BE" but it's no JBL parts in it, but i know Guido built many JBL Projects in the past, so he knows what to do to sound like a JBL. ;-)
So my idea was to create something "cheaper" (ok the Beyma Bass is not expensive, it was not designed to replace the JBL 2235 exactly but it's very similar and has a foam surround too),
The next thing is that most of all Speakers are passive crossover.
And ivica you are right ! It's better to build two separate enclosures for the Bass and Horn, so i can swap the drivers without changing all enclosure parts.
(sorry about my english ;-)
Another idea is to create a changeable baffle front-plate, perhaps fastened with screws... so i only have to change one section.

[Ruediger]

See the data sheet for the 2226H, on page 2, the dashed curve shows what you can expect from 140 liters. This is what you wanted, initially, right?

Ruediger

[notengewirr]

Yes , there is a 140L enclosure tuned to 40Hz.
i think the f3 is near 40Hz , -5dB is ca 36Hz ( dashed curve)
can this be correct ?




so here i calculated the 2226H : the grey line is 'optimal BR, the red line "meine Box" is 140liter tuned to 39.1Hz (at QTC 0.6)
i think it's very near by the JBL spec.

[Ruediger]

... was the title of an article from W.J.J. Hoge. It came with a flowchart:



This formula is handy for intermediate designs (between "pure" alignments.

Do not forget to calculate the proper Qt for your bass driver, including all resistances in cables and xover coils. It's formula 70 in the Thiele paper.

Ruediger

[Lee in Montreal]

I run a 2226 crossed at 600Hz to a big 2360 horn, managed by a Behringer DCX and am very happy with it. The horn is EQd for CD compensation, while the woofer is processed with a 12db Q=1.0 at 40Hz on a cabinet tuned to 40Hz.

[notengewirr]

very cool setup ! and the 'Yammis' too ... but a 2360 is a bit to big for my room.

is the 2226 enclosure DIY , and what's the enclosure netto volume ?

The Cd EQ is also done by the Behringer DCX ?

[Lee in Montreal]

very cool setup ! and the 'Yammis' too ... but a 2360 is a bit to big for my room.

is the 2226 enclosure DIY , and what's the enclosure netto volume ?

The Cd EQ is also done by the Behringer DCX ?

Yup. Home made enclosure with curved sides. Volume is 140 litre - 5 cubic feet

CD comp is done with the DCX2496. It is a simple HP filter with 6db curve starting at 4K Hz. Compensation is 15db, could be less if you prefered.

[pos]

Very impressive construction and painting job!

[spkrman57]

All depends how you use it.

Nice looking project, even if the horn dwarfs all else. My room is too small for a horn that large!

Regards, Ron

[Lee in Montreal]

The 2226 could do very well in a 10cft enclosure tuned to 30Hz for hifi. Just don't feed more than 400w ;-)