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JBL M2 Clone

The M2 is not in place, so we can only add a mezzo unit to him.
 
Do you have building plans for the M2 ????
There is a build-thread:
Rather long, but it has good info on the crossover and filter settings, and the cabinet and port construction.

On the JBL M2 Page, there is a moderately detailed drawing of the cabinet in the brochure:
https://jblpro.com/en-US/site_elements/m2-brochure

The parts are available here:

A construction video was made by someone (not me):
I do recommend earplugs.

I am planning on updating this thread with more detailed plans. I am doing sealed instead of ported, with PEQ to transform the bass response. I can afford the reduction in peak output, in fact I welcome it since these play dangerously loud. I do recommend DIY M2 if interested, they are fantastic sounding and actually quite easy to build.
 
The compression horn Is a two way driver? Shall l be using a two way x over or a three way? I use and electronic x over btw.
 
So l ll set my electronic x over 24 db slope, two way.. cut at (?)
 
So l ll set my electronic x over 24 db slope, two way.. cut at (?)
No, the tweeter crossover is hybrid passive/active.
The details for the exact filters and crossover components are here:
Here is a schematic of the passive part:
1699631727775.png

The 6dB / oct passive network above, plus the additional 6dB/octave active filter (in the rephase pdf above), plus the driver's rolloff all conspire to 24dB/octave at about 790 Hz.
I measure the tweeter and discuss filters here:
 
When was the last time anyone got the M2 D2's off of Speaker Exchange? I think one of mine is toast, probably 2 (I have 3 official M2s). Was an unfortunately hazard, not from normal operations. Are there other sources if you own legit M2s?

I am getting some measurement gear, as well as digging out my DMM to at least test the static impedance. I am not hopeful for two of them.
 
When was the last time anyone got the M2 D2's off of Speaker Exchange? I think one of mine is toast, probably 2 (I have 3 official M2s). Was an unfortunately hazard, not from normal operations. Are there other sources if you own legit M2s?

I am getting some measurement gear, as well as digging out my DMM to at least test the static impedance. I am not hopeful for two of them.
Call or email Speaker Exchange.
Same for JBL service.

Best wishes for a reasonable recovery!
 
BTW, I read most of this thread. I live in Toronto, ON, but grew up in Puyallup, WA. My sister and her family live in Vancouver, WA. I go a couple times a year.
 
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I use a 2269h on the bottom in a 12cu/ft box tuned to 30hz with a 2123h mid and the M2 horn and driver.
I really like it. DSP is a drive rack two. Crown 5002vz mono each woofer then had k2 for mids and highs.
 
Sorry I Should have attached a picture. This is a re-purposed box that used to contain:2245,2123,2445/2385 and two 2405 bullets.
That's why the box is so hacket up, but it still sounds great. It's sitting in the kitchen as I don't have room anywhere else.
These I call my surround speakers as the mains have changed! Now I have upgraded two my modified version of the 5742.
Each use double 2269 sub, double 2268 low, 4-2169 with phase plug and factory high horn but using D2/M2 driver.
All driven with dsp and six 5002VZ's four of them wired 220 volts. Works well.
 

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The specs are not clear i think :)
There is no handy xmax figure but there is a lot more useful information about the driver in the datasheet.
For Bl 82% of the resting value is 15.5 which is about 6mm of displacement
For Kms 75% it looks to be a little more but it is hard to read the values.

There is 6.1mm in one direction 6.3mm in the other (XP+ XP-) which is close to the values from the Klippel data. There is a protection at 9.5mm so it won't travel further than that.
 
I have all the pieces coming into place. The dspNexus is here, although the software interface I am just dipped my toe in. Received my nord Acoustics NCx500 b 4 channel amp. I suspect my D2s are toast, D2s are backordered for quite some time, I got a pair 2540SLs. I need to go to go to my storage unit and take the M2 horn/lense from my 3rd damaged one and test the 2450SL driver on it.

Can anyone point me to a quick YT tutorial on REW measurement? I have it installed, but am not up to speed.
 
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