A JBL L300 DIY Project

[Thomee]

Hello friends,

I am currently working on building an L300 speaker using Nelson Pass xo. I have already ordered the cross-over parts from the Madisound online. I am want to make a cabinet like this:

https://www.yoycart.com/Product/534163460324/

And install the tweeter on top of it. I am going the make an 5 cubic feet volume for the 2235H's and tune it to 30Hz (by two 4" x 11" ports).

The only problemI have is the horn. I have the short 2307 horn (which works for the 4-way version). Is there any other horn (like the one in the picture above) that works fine with the xo using the 2420 driver. I cannot find the 2312 anyway... Is there any solution for this?

Any help is greatly appreciated, as I am kinda excited and want to build this speaker as soon as possible.
I will post photos as I start building the speaker cabinets.

thanks

[SEAWOLF97]

I am want to make a cabinet like this:

https://www.yoycart.com/Product/534163460324/

Speaker type:
Front

Sensitivity:
93dB mW

Power:
200W

Brand:
I love you.

Model number:
HORN-2 15

Impedance:
8.


Those are great speakers you have, what kind are they ??

I love you

yes,yes..we'll talk about that later....but what kind are they ??

sorry, sometimes the Chinese forays into English are funny. :)

[Mr. Widget]

Thanks for sharing.

I have been looking for "Front Type" loudspeakers. They have been very difficult to find.


Widget

[Earl K]

Well Thomee, the good news that passive components are flexible ( from the perspective that one can alter their values by adding additional parts to them ).

So ( no matter what ) you really won't be out of pocket if it takes forever to locate a pair of 2312 horns.

As you likely guessed, the Nelson Pass network is unique and only usable on a real L300 ( as is any custom network ).

My recommendation would be to buy a pair of Altec 811 or 511 horns ( on the used market ).

The 2420/le85 plays nicely on those horns ( according to Zilch ).

http://www.audioheritage.org/photopost/data//500/811B_LE85_REXO_Normal.jpg

At least the Altec are deep horns ( compared to all the latest crop of wave-guides that are at the very most, half the depth ).

A similar depth horn means the values of the passive components have a better chance of being useful in a working crossover for those radials/sectoral.

Also, I'm also pretty bullish on this ZXPC BiRadial sold here ( click the pic ).
- though it requires some modelling-clay work to fix it's flare-rate problems.
https://i.ebayimg.com/images/g/7rEAAOSwNSxU27uC/s-l500.jpg (https://www.ebay.ca/itm/10-x-18-ABS-Plastic-1-3-8-Screw-On-Large-Bi-Radial-Horn-For-Speaker-Cabinet/331477247778?hash=item4d2d956722:g:7rEAAOSwNSxU27u C)

They need about a 1/2 lb of plumbers putty smoothed into the throat section to be usable > but once that's done a person can get a solid 750hz out of this horn when driven by a JBL 2425/6/7 driver.

http://www.audioheritage.org/photopost/data//500/JBL2427H_ZXPC_Horn_b.png

Your 2420 would need an adapter to make it into screw-on to mate to the ZXPC ( which wouldn't be the end of the world sonically ).

Getting an Altec Radial ( or the ZXPC mentioned above ) would put you a step closer to the setup seen in your pic ( which was meant to be a TAD 4001 on a TH4001 > or should be ).

83618

:)

[macaroonie]

You propose to use 2235 h woofer for your project. JBL did in fact spec the 2235h as a suitable drop in replacement for the original driver (2231 from fading memory ) .
Please be aware that the 2235 is pretty much a sub woofer with a good response down to 20 Hz. This is achieved with the addition of a mass ring of 30 gms installed under the dust cap internal to the voice coil former.
While this achieves it's aims as always it comes at a price, a drop in efficiency and a loss of useable response at the top end.
The sonic signature in the 400 to 800 Hz octave becomes somewhat dark / muddy / thick. etc. It is of course unreasonable to expect 30g of dead weight on the speaker cone to be as clear and agile as a hf diaphragm weighing considerably less.
From personal experience a X/O in the 600 Hz region yields much greater clarity and solid imaging.
This of course can not be done with 2420 etc
on the conical horn . 800 is pretty much as low as you can go.
The solution is to aim for 500hz if you can find a horn +driver combo that will play well in that region. To that end you will need a large format driver and a suitable horn.
In my homebrew I opted for a B&C 2inch exit driver on a JBL 2380 horn
Using an active network it quickly becomes apparent that the 2235 just will not play well at 800

Best of luck with your project

[SEAWOLF97]

Thanks for sharing.

I have been looking for "Front Type" loudspeakers. They have been very difficult to find.


Widget

looks like they are sold out :blink: Mabye Mr. W bought the last 4 units. ??

Sorry ,this product is not sell anymore.
(It is out of date or link error. Most likely, the seller no longer sells this product .)

when I looked at the page yesterday, the price was approx $4,500US EACH . for the price of a single, you could have bought a pair of real JBL L-300's




In my homebrew I opted for a ....

would like to hear them someday.

[DavidF]

Discount of $1.81 each if 11 or more units are purchased. Group buy! Anyone?

[SEAWOLF97]

Discount of $1.81 each if 11 or more units are purchased. Group buy! Anyone?

back to 99 available.

I'm no expert , but this is a 2235h ? :dont-know:

HIEND high-end fever 15-inch rotorcraft horn speaker imported JBL original driver 2235h bass genuine

[ivica]

Hello friends,

I am currently working on building an L300 speaker using Nelson Pass xo.

The only problemI have is the horn. I have the short 2307 horn (which works for the 4-way version). Is there any other horn (like the one in the picture above) that works fine with the xo using the 2420 driver. I cannot find the 2312 anyway... Is there any solution for this?

Any help is greatly appreciated, as I am kinda excited and want to build this speaker as soon as possible.
I will post photos as I start building the speaker cabinets.

thanks

Hi Thomee,

Have You tried SELENIUM HL-14-25 (1"-throat horn), seems very similar to the JBL 2312, You are looking for

https://www.jblpro.com/ProductAttachments/HL14-25_SpecSheet.pdf

regards
ivica

[Challenger604]

back to 99 available.

I'm no expert , but this is a 2235h ? :dont-know:

HIEND high-end fever 15-inch rotorcraft horn speaker imported JBL original driver 2235h bass genuine


LOL!! You’re kidding don’t you!!!

[martin_wu99]

Speaker type:
Front

Sensitivity:
93dB mW

Power:
200W

Brand:
I love you.

Model number:
HORN-2 15

Impedance:
8.


Those are great speakers you have, what kind are they ??

I love you

yes,yes..we'll talk about that later....but what kind are they ??

sorry, sometimes the Chinese forays into English are funny. :)
Bond,LOL!you are kidding:D
They said they developed woofer by themselves directly from JBL 2235H and ATC SB100-375,the tweeter is SELENIUM 408Ti,cab is TAD 2402,brand is NBM(nothing but music):D
Not bad,but i think the price is too expensive