JBL M2 Clone

[tonycaoyi]

The M2 is not in place, so we can only add a mezzo unit to him.

 

[Pulkass]

Do you have building plans for the M2 ????

 

[MAB]

Do you have building plans for the M2 ????

There is a build-thread:

Project M2 DIY Thread

Since the JBL Master Reference Monitor thread is so massive I'm staring a thread that I and others can document our M2 DIY process if the. Here are some links that I was able to reference. Thank you for all of your contributions that made my and others project happen. Schematic of the M2 -...

www.audioheritage.org

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:

You searched for jbl m2 - Speaker Exchange

reconingspeakers.com

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.

 

[Pulkass]

Many thanks. I m absolutely obsessed with those loudspeakers, l m goin to build them

 

[Pulkass]

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.

 

[fluid]

The compression horn Is a two way driver?

No dual diaphragm, not two separate ways.

 

[Pulkass]

So l ll set my electronic x over 24 db slope, two way.. cut at (?)

 

[MAB]

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:

https://rephase.org/projects/JBL_M2_crossover.pdf

Here is a schematic of the passive part:

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:

JBL D2430K Measurements

I have been interested in the Project M2 DIY Thread for some time. I helped a friend install a fabulous home theater with 708i, but I have been fascinated by the M2. Recent reviews of the 708i were interesting, especially given my positive impressions of the speaker. Erin's review of the M2...

www.audiosciencereview.com

 

[jmpsmash]

@MAB do you have the impedance plot of the D2430K mounted on the M2?

 

[MAB]

@MAB do you have the impedance plot of the D2430K mounted on the M2?

This is as mounted in the lens:

The raw data is attached if you need.