4367 Cabinet

[emilime75]

First impression with a cheap-and-dirty DSP curve is very promising. I think one of the main advantages of the large format driver and the 4367 wave guide is that horn load extends down to the 500Hz region. The drivers has rising impedance from about 650Hz and XO at 700Hz is probably about right. I dialed in some LR24 with a few EQ points, guesstimate delays and adjusted phase and that was not half-bad. I run mono in the workshop for initial tests. Beyond that I really like the matched 2451 cores with the 475Nd diaphragms. That combo seem to love the newer JBL wave guides.The 2216 just loves power and my smaller shop amps is no match for my down-ported 2216Nd-1's. The current it can provide is just not enough. I had the same experience with the woofer in the LSR 6332 (252G 4 ohms), they just needed a big amp to come to life even on low volumes.Will bring down my normal ref Genelecs and LSR6332's tomorrow just to get a better feel for potential differences. The next few weeks will be getting a good DSP file in order. Exciting times.Have nice weekend//Rob

Rob, excellent work, as usual. What is the net volume of the enclosure? What amp/s have you been testing with that you don't feel have enough power? Do you think the 2216ND would work as well as the -1 in the same enclosure?

[sebackman]

Thank you for all the encouraging comments. This project has consumed a few hours so far. :-)

Emilime, I don't know what the net volume is. Mine are probably a few liters smaller due to additional bracing, bigger driver, longer ports and additional damping. The latter would acoustically probably enlarge the cabinet but the rest would not.

I have no passive XO's in the cabinets so maybe they are where they should be.

The shop amps are dual Alesis RA300's (2x90W RMS) connected to my shop BSS DSP XO. I use two amps to be able to run 3-way, if needed, and use the last channel as direct reference to tara out the electronics when using dual channel measuring. That way I don't really have to calibrate the electronics as I only measure the difference between a "clean" signal after the power amp and the microphone signal.

As far as I understand the difference between 2216Nd and -1 is a thin ribbon of Aquaplas on the rear side of the cone to increase the Q and potentially a stronger magnet to compensate. I have not seen a spec on the -1 but the 2216Nd is in the driver info section here, courtesy by Giskard. However, someone from JBL once told med (right or wrong) that the -1 has a stronger magnet to achieve the lower end in combination with the heavier cone in a passive structure.

This should theoretically give some more deep bass without active filters/DSP. If you run with the original filters you may have to measure the low end and maybe compensate with tone controls/EQ/DSP. That is what the M2 people do anyway :-) . If you go active you are good to goo. Just adjust in the filter/DSP +3-6db @ 30-ish Hz.

I have had both and cannot identify any sonic difference in the all so important midrange.

Happy Friday

//Rob

[Robh3606]

Has anyone heard port chuffing in a classic 43XX or a 44XX or in a DIY system not using undersized ports?


I bring this up because it is difficult to model the port tuning when using flared ports. You can measure, trim, measure, and repeat until you hit the target frequency, but this seems like an unnecessary hassle if performance alone is the goal. On the other hand if the aesthetics of a flared port is appealing to you, then I guess you have your work cut out for you.


Widget

Hello Widget

Depends on the software. With mine I can model double flared, single flared and just about any other configuration. Also the instructions that come with them are quite good you end up calculating the length of straight section that joins the flares. Too answer your question I have had issues with port noise on a couple of JBL's but the smaller systems.

Rob

[sebackman]

Finally after many years the 4367M's are finally live. Still quite a lot of work on curves but promising.

Today is the first day I play music on both of them. I did build a basic streamer with a RPi 4 feeding a BLU-USB digitally (via USB) and then digitally to the BSS DSP, and hence nothing analogue in the chain. The BLU DSP feeds two CTS600 under each 4367. Volume is done in the digital domain in the BSS.

I will move to a different BSS within a few weeks that has digital out card and use SOTA external DAC's. Don't really know it it makes any difference but just because I can and have most of the stuff :-) .

But for now it is pretty enjoyable. I can share the curves later when I'm done.

As of now I will tweak them a little and then compare with my M2/476Be/045 as can be seen in the picture. I will probable also add my LSR6332/LSR6312 and my small Genelec references to compare.

Let the feast begin.

[Earl K]

Nice!!!

[Robh3606]

Yes Very Nice!!!

Rob

[Mr. Widget]

Finally after many years the 4367M's are finally live. Still quite a lot of work on curves but promising.

Today is the first day I play music on both of them...

Congratulations!

That's a lot of speakers. I can hear your neighbors complaining from my house!


Widget

[srm51555]

Yes, very nice work as usual!

[Jakob]

Splendid, they really turned out great! I bet it's quite rewarding to be able to finally listen to them after all the time and effort you've put in.

It seems the 2216's knocked out the bear though !


Would be very helpful if you could share the dsp-setup; filters, eq etc when ready.

Just out of curiosity, how do your FR usually end up? Do you go for a Harman-like curve, a flat line or perhaps concave?

[macaroonie]

Damned good work there Rob