Need help with crossover 2440/2360 and 2405

[aktivkampi]

Please, can anyone help me with my crossover for my 2440/2360 and my 2405. I wan't to cross them at about 9 KHz. Has someone good ideas ???. The 2405 is mounted in the 2360. What about passive EQ for the 2360 ??? I'm thankful for any ideas.

[1audiohack]

Hi aktivkampi;

I have crossed mine at 8KHz and 10KHz and think the 2360's sound fine either way. I like the 2405's crossed high so I just cross them at 10KHz.

From 1KHz to 10KHz THE 2360 will only need an EQ slope of -4.5dB at 1KHz rising smoothly to 0dB cut at 10kHz.

I did mine active so I don't have any information on a passive schematic, sorry.

I would like to see how you integrated the 2405 into the 2360. I placed my 2405 in front, I want to integrate it but just don't have the heart to hole saw the 2360, yet. Will you post a picture please?

[aktivkampi]

Hi 1audiohack

Here are some pictures of my system. At the moment, it's only a testing phase. After I find the finally position of the slots, I'll make it a little bit "nicer"
I have two corner subs with 2235 reconed in a K 140 basked. They are crossed at 63 Hz / 18 db with an aktiv crossover. As low-mid I use a 2206. They are running from 63 Hz to 500 Hz. The 2360 starts at 500 Hz and it's crossed with an 0,22 mH inductor in series and a 1,5 yF capacitor parallel. The slots are crossed with an 18 dB filter 1,0 yF + 1,5 yF in series and in between a 0,15 mH inductor. Hope you like it, after finishing the project, I'll psot some new pictures

[aktivkampi]

some more pictures.......

[Ruediger]

Hi aktivkampi,

the 2440 requires a tweeter, it's HF response drops abruptly at ca. 10 kHz, too much to equalize it.

The 2441 is a 2440 with a different diaphragm, it has a better HF response and it can be equalized such that a tweeter is not needed.

This is also true for the 2450.

So You can either swap the diaphragm or sell the 2440 alltogether and buy a 2450.

If You buy a decent digital crossover then:
1.) You can apply the CD horn correction.
2.) You can equalize the HF end.
3.) You can put the woofer and the midrange driver in the same plane by delaying the woofer.

Ruediger

[speakerdave]

JBL made the 3160 crossover to include the passive equalization for those big bi-radial horns. The schematic is at JBL pro, but you can't build it, because that tapped inductor is not available. I'm not sure it will compensate correctly with the 2440 diaphragm, which, as another poster said, drops off at about 9 or 10k. I also agree with the suggestion to use SL diaphragms. But, if you like the 2440 diaphragm in particular --I know some prefer it--I would suggest you try running it with the 3160 (i.e., without a low pass inductor at the upper end of its range) and experiment with crossing the 2405 in separately, or, as GT suggests, run it with a high-passed chip amp or similar.

[jerv]

I am also playing with the 2360. I use (for the moment) 2445J drivers with standard diaphragms, but I have ordered 2450SL aquaplased dias. They have not arrived yet, so my measurements and simulations are with the standard 2445J driver.

According to my measurements, the 2360/2445 combination drop off from 1 kHz at a slope of about 5dB to 5kHz. Then it drops off somewhat steeper up to 10kHz, which is about 12dB down, again compared with 1 kHz. Between 10 and 20 kHz it apperas to be two resonances, extending the response somewhat. See attached graph, black curve.

FWIW, I have made a passive equalizing network for this combination with crossover at 600 Hz and response from 800 Hz to 20kHz within +/- 2.5dB. To achieve this, the 1kHz level is damped about 12 dB. See attached graph, blue curve.

If you elect to use the 2405 (as I also intend) with a crossover of about 8-9 kHz, the 2360/2445 doesn't need nearly as much compensation: about 3-4 dB attenuation at 1-2 kHz is enough. I have simulated the 2360/2445J with a 4th order filter slope at 9 kHz (see graph, red curve), but I haven't gotten to actually installing and measuring the 2405's yet. I will keep you posted.

Atteched: 2360/2445J curvers, and passive crossover/equalizing network for use without tweeter.

[Beowulf57]

9 KHz might be a bit high for the 2440? I haven't used them, but JBL literature usually crosses over to an 075/077 lower than that with the 375/2440. You could check out the 3106 (N8000) network here: http://www.jblproservice.com/navigat...chematics.html. The HF level control would allow you to dial in your sweet spot. Perhaps also the 3105/N7000? Others with more experience than I would know better...just a thought.

[aktivkampi]

Hello to everyone......

Just finished my project, now I'll post some pictures. Hope you'll like it. Now I'll do some experiments with the passive filtersection between the 2360 and the 2405. I'm thankful for any advice, specially for passive EQ for the 2360 and the 2440....

Merry Cristmas to all

greetings Aktivkampi

[pos]

wow :shock:
that is an amazing finish on the 2360!!

[Allanvh5150]

I agree with POS. Nice finish on the horns. Is that an auto colour?

[aktivkampi]

Yes, it's an autocolour from BMW. It's called "Milanobeigemetallic".

[jerv]

Wow - looking very nice!!!

How are the 2405's mounted? What about the placement in the mouth of the horns: does it give any ill effects (diffraction etc)?

EDIT: Please provide some detail pictures of the 2405 mounting

[aktivkampi]

Hi Jerv

The 2405 are mounted on the same plate on what the 2360 is mounted. I cannot describe it so well in englisch, hope the pictures will do that !!!! The speakercable is an dnm reson. It runs between the top of the basic enclosure and the plate on what the 2405 is mounted. Behind the 2405 is a hole in this plate, where the cable runs through. The crossover is mounteg directly in the cable. Mounting for the 2405 is 25 mm MDF, coloured same as the 2360. It is cut out with a CNC machine, so that you can stick the 2405 for behind in it and it fits exactly. The sound is amazing..... the 2405 runs in phase and the 2360 is converted about 180 degree. I'm now playing a little bit with the crossover, but I've no measurement and not the real background in constructing crossovers. Hopefully waiting for new ideas and information........

Greetings Guido

[hjames]

Thanks for the pictures and information -
That looks so cool and amazing!