Project M2 DIY Thread

[srm51555]

Great progress Johan!

Those items in the background of photo two look pretty awesome as well.

[johanwholst]

Great progress Johan!

Those items in the background of photo two look pretty awesome as well.

Thanks! I really need some cheering as this project progress slower than I want to... Eager to hear 2216nd in a more correct cabinet than the one I'm using now.

[hlaari]

great job Johan!

I think at we will have great time listening to you M2 speakers when I will visit you in the late summer




Ari

[johanwholst]

great job Johan!

I think at we will have great time listening to you M2 speakers when I will visit you in the late summer




Ari

Most likely! I'll make sure we have a lot of fun stuff to play with

Looking forward to see you up here

[4313B]

Nice!

[sebackman]

Excellent work Johan. That will be some awsome speakers.

It would be interesting if you could post a un-smoothed curve from your differen drivers in the M2 WG.

And please keep the pictures over progress coming, theay are inpiration to us all.

Kind regards
//Rob

[ivica]

Thanks! I really need some cheering as this project progress slower than I want to... Eager to hear 2216nd in a more correct cabinet than the one I'm using now.

Hi johanwholst,

Very, veeeery nice work.
One question- where is baffle step in the lowre part of baffle under the bass driver. Here on the Forum there has been a lot of words about, talking about revolutionary upgrades round 500Hz after such improvement.
Wish You great success in your project
Ivica

[Kalle]

Has this been done DIY? It seems a little bit tricky to get the round shape. If so please provide pics. I have not desided how to do mine yet.

Regards
Karl

Hi johanwholst,

Very, veeeery nice work.
One question- where is baffle step in the lowre part of baffle under the bass driver. Here on the Forum there has been a lot of words about, talking about revolutionary upgrades round 500Hz after such improvement.
Wish You great success in your project
Ivica

[johanwholst]

Ivica and Kalle
I tried to add a 16mm piece with routed edges to the lower part.
It kind of messed up the looks, so I'll take my chances at those 500hz advantages and dropped it

It is always good to do some bad decisions to maintain the audiophile nevrosa. Keeps this hobby much more intresting

Sebackman: I will try to do and publish some decent unsmoothed measurements of 2450be. It was a pain mounting them, so I will not swap back to D2 anytime soon.

[sebackman]

Here are some outdoor measurements I did. These are at zero degrees.

First is 2451J Ti
Second is 2450SL
Third is 2451H Be

All on exact same gear and waveguide.

Kind regards
//RoB

Test JBL 2450SL / 2451Ti / 2451Be / 2332 / VTX F12 / M2

Outdoor at Håkke, tripod, turnable to 0, 30, 60 and 90 degrees

SW LSPCad Pro 60 (latest update), HW M-Audio Fast Track Pro, Samson Servo 200 amp, Earthworks M30 calibrated mic, 33mf protection cap in series "Mundorf",
2-Channel measurement (delta), 48kHz, 512k buff, 65536 MLS, no smoothing, offset 71 cm, range 40db, window 10ms, ca 88db level

[johanwholst]

Excellent work Rob!
Is the measurement of 2451Be with M2 WG?
It looks very smooth. would need very little correction to reach 16k. Just a notch at 1500 and a shelving for a more or less flat response in its working range

[ivica]

Ivica and Kalle
I tried to add a 16mm piece with routed edges to the lower part.
It kind of messed up the looks, so I'll take my chances at those 500hz advantages and dropped it

It is always good to do some bad decisions to maintain the audiophile nevrosa. Keeps this hobby much more intresting

Sebackman: I will try to do and publish some decent unsmoothed measurements of 2450be. It was a pain mounting them, so I will not swap back to D2 anytime soon.

Hi johanwholst,

No problem, I am only joking , as I do not believe that such 16mm larger part of back chamber would improve 500Hz response ( wave length about 0.7m). I believe that something else JBL have done in order to reduce a kind of cancellation or driver, box, ports, depth etc .. can be a reason... but it would be difficult to get real answers....
Your work is respectable , from ANY point of view

regards
ivica

[johanwholst]

One speaker glued up and the other in process.
Everything squares up perfectly after running all pieces trough the table saw today.

I used lamello biscuits for all joints witch makes life much more pleasant



you can never own too many wise grips!



It looks surprisingly tiny. (empty) beer bottle for comparison. Hope I got the dimensions right...

[Kalle]

Very nice indeed Are you going to make grilles for them?

Regards
Karl

[johanwholst]

Very nice indeed Are you going to make grilles for them?

Regards
Karl

No, I would probably never use them so it's not worth the effort