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JBL M2 Clone
- Thread starter MAB
- Start date
OP
MAB
Major Contributor
- Thread Starter
- #43
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
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 - The Speaker Exchange
reconingspeakers.com
A construction video was made by someone (not me):
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.
No dual diaphragm, not two separate ways.
OP
MAB
Major Contributor
- Thread Starter
- #48
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:
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
JoshK
Member
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.
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.
JoshK
Member
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.
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.
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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Hornlyd
Member
- Joined
- Feb 4, 2024
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What is the xmax on 2116d?
The specs are not clear i think
The specs are not clear i think
you mean 2216 ND ?What is the xmax on 2116d?
The specs are not clear i think
https://www.petoindominique.fr/php/mysql_listehp3.php?marque=JBL
There is no handy xmax figure but there is a lot more useful information about the driver in the datasheet.The specs are not clear i think
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.
JoshK
Member
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.
Can anyone point me to a quick YT tutorial on REW measurement? I have it installed, but am not up to speed.
