JBL 2123H in a two way speaker

[audiophile.1963]

Hi, I have a pair of unused tweeter JBL 2403h and I'd like to realize a compact two way speaker to combine with a subwoofer. What JBL woofer/mid woofer, old or new, can I use?
Giuseppe

[Robh3606]

Hello

It's doable but you will be limited to about 100hz so you are going to need a subwoofer. Look up the 4716

Rob :)

[grumpy]

... and play that 10" driver up pretty high (~3.5-5kHz) or risk blowing up the 2403 (90º horiz)... which is much, much higher than a 10" driver should be used regarding matching off-axis response at crossover.

http://www.acousticfrontiers.com/speaker-off-axis-ka-and-driver-diameter/

Not really seeing this as an optimal 2-way project (opinion). :(

Also not saying it can't be done... speaker makers have certainly sold 10" two-way systems that stretched driver capabilities... say the old Infinity Qa... but even that was crossed over at 2500kHz. More typical is closer to 1kHz (say the Advent).

[jbl4ever]

The JBL E/K 110's will get up higher in frequency but with the rising response will need EQing.
A couple of years back I heard some 2155H's which would work but they are 15's. The person used the JBL 2404H's for the tweeters and a sub below 100Hz
http://www.jblproservice.com/pdf/Discrete%20Sales%20Models/2155H.pdf

[audiophile.1963]

I did a mistake in the title of this thread, I wrote "JBL 2123H in a two way speaker" but the right form is "JBL 2403H in a two way speaker". Every time I think to sell these tweeters but I would not like to repent and then I close the closet where I keep them. In fact, what I'd like to know is if is there a small JBL woofer that goes up in frequency, my two subwoofers think about the bass frequecies.

[audiophile.1963]

I don’t know all JBL woofers new, old or vintage, I see on Eminence catalogue Woofer Alpha10-A or Eighteen Sound - Professional loudspeakers 8NMB420/8NW650/10W500/10W650 (4 differet woofers) or Dayton Audio 10"/8" woofers, the most compatible for my project. What do you think about? I prefer JBL components but …

[Ian Mackenzie]

Have a look at these threads for guidance.

A better approach would be to consider the L220/L222 components and crossover schematic.

The 2123H will beam tightly above 2500 hertz and cone breakup behaviour will become an issue.

A LE5-9 or LE5-10 is a better choice when used with the Jbl L220/L222 network from 800-5000 hertz with a LE14 woofer below it. The Jbl design is already done so why screw up the application of the HF driver?



http://www.audioheritage.org/vbulletin/showthread.php?18359-Could-someone-please-help-me-get-the-spec-sheet-on-076-2403

http://www.audioheritage.org/vbulletin/showthread.php?6368-Ring-Radiator-Comparisons


http://www.audioheritage.org/vbulletin/showthread.php?4014-L220-Frequence-range

[Mr. Widget]

I did a mistake in the title of this thread, I wrote "JBL 2123H in a two way speaker" but the right form is "JBL 2403H in a two way speaker". Every time I think to sell these tweeters but I would not like to repent and then I close the closet where I keep them. In fact, what I'd like to know is if is there a small JBL woofer that goes up in frequency, my two subwoofers think about the bass frequecies.Since the 2403 is really designed to be crossed over at 5KHz or higher, that limits things significantly. If you want to stay with JBL, I'd suggest the LE8T or the slightly more modern ferrite version.

If you are open to other brands, look for a "full range" speaker with a small cone diameter, certainly no larger than 8".
Good luck, and keep us posted!


Widget

[grumpy]

Or match with a vertical array of say 3” to 4” drivers... that could be fun :)

[Ian Mackenzie]

Hi Giuseppe,

I hope these responses provide you with some guidance.

The Jbl 2118 8 inch driver is another option. This is a relatively high efficiency mid bass driver. But bass response is limited below 100 hertz.

It important to appreciate the Jbl 2304H is a high efficiency driver. If you wish to retain relatively high efficiency in your project then you will be looking for a relatively high sensitivity midrange or mid bass driver. (95-100db sensitivity 2.83 volt). The compromise will be that such drivers will have very limited bass response below 100 hertz. So the project system will require a relatively high sensitivity woofer or a subwoofer that can function up to 150 hertz. Such a system will end up being much larger than a bookshelf loudspeaker.

If on the other hand your focus is a two way bookshelf project system with reasonable bass response then you will need to compromise on system efficiency and explore lower sensitivity drivers (86-90db sensitivity 2.83 volt) which have a more extended bass response. You can explore this with online bass simulation programs like http://www.mh-audio.nl/Calculators/ReflexBoxCalculator.html

Driver manufacturers Visation and Seas in Europe make hifi drivers that fit this requirement.

If you want to use Jbl drivers then consider the Jbl L220/L222 system components. A Jbl 123 series woofer used in the JBL L100 Century would be a woofer to consider for a more compact bookshelf system. Jbl has similar systems in production like the Jbl 4307. https://www.jblsynthesis.com/products/loudspeakers/type/bookshelf-loudspeakers/4307.html

If you wish to explore design of crossover network options in detail or other driver options send me a Pm.

Ian