Another DIY M2 thread

[pos]

Hello

448mm x 394mm

I will measure the depth(s) tonight.

depth is around 80mm from the baffle, depending on what you call the baffle (is is a two-part assembly) and if you account for the adapter or not.
The the waveguide also has a ~40mm overhang from the baffle, again depending on what you call baffle, and what part of the profile you are measuring...
So total depth of the profile (from the throat to the mouth) is around 120mm.

[sebackman]

Hi dprice

Did you ever get around to measuring what resonance frequency you got from the ports in your M2 cabinet?

Fs for the 2216Nd is 36Hz mechanical from the TechBot file but seem to be all the way up to 39,3Hz from the Mlssa measurement also posted in the same document.

Some post in the lengthy M2 thread seem to indicate that the system Fs is 27Hz for the M2 system.

Not really sure what happens if system Fs is lower than the driver Fs. I will post a separate thread on that. -Also posting this question in the other DIY M2 thread.

Kind regards
//RoB

[dprice]

I haven't measured anything. The wife will be working late tomorrow so that may give me a chance to measure them.

[Kalle]

Impressive build If mine get half this nice I will be wery happy I hope to get the last parts this week (D2 drivers). I will try to start with my build soon. I wounder what ports and what length you used? URL?
I`m thinking of these ones and the inner flare in 75mm. http://www.hifikit.se/tillbehor/3-konisk-basport
According to Win ISD the 2x 75mm port should be about 160mm for 27hz.

Best regards
Karl

[dprice]

Karl,

I used these which I measure as 77 mm ID.

http://www.parts-express.com/precisi...e-kit--268-350

I can't find my notes but I'm pretty sure I went for about 9" (239 mm) overall for a 27Hz target tuning.

[pos]

I used the three-part JETSET70 kit that can be found in several online shops in Europe.
I only used inner flares to avoid screw holes.
It has flat rebates (contrary to the drawings) so It can easily be glued in place.

[dprice]

Looks like I got pretty close to 27 Hz if I'm reading this right.

m2 woof test.pdf

[JeffW]

Looks a tad lower to me, maybe 24?

[jlac4]

Thank you Pos for the answer .It's very kind of you .
I hope you will post some pictures about your DIY M2 .And I am waiting for your feeling about the comparison between your previous system and these JBL DIY M2.
I hesitate a lot in buying all the components to built by myself these M2; 4000Euros is a lot of money but I think it must be cheaper if we compare with other big system .It's Worth trying that .