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12" Sub Build With BMS12N630

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toastyghost View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Topic: 12" Sub Build With BMS12N630
    Posted: 02 October 2021 at 5:28am
Although it’s not great to judge from a single trace in unknown conditions, if you do an average of measurements ~30 degrees around the listening position and still see the dip at 45 Hz, you might want to look into a limp mass absorber on the wall opposite to the normal orientation of the speakers.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vertx Quote  Post ReplyReply Direct Link To This Post Posted: 02 October 2021 at 4:45am
The grille for the sub is on it's way thanks to Markie Thumbs Up

Plus I downloaded the latest version of REW and got stuck into the EQ on the mains.

Frequency response from 0 - 40 degrees at 1m seems pretty much flat now within +-3db. I didn't bother taking much time to EQ anything under 300hz as there's no way to guarantee the measurements are good, but everything above that looks good. The SBAcoustics 4" NRX2 mids are great for the cost, running 300hz to 3khz here.

Frequency response on-axis with psychoacoustic smoothing



Same with Var smoothing


and no smoothing

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Post Options Post Options   Thanks (0) Thanks(0)   Quote vertx Quote  Post ReplyReply Direct Link To This Post Posted: 23 September 2021 at 10:04am
Originally posted by JonB67 JonB67 wrote:

Fantastic work vertx. 

If it sounds as good as it looks you're onto a winner.  Let us know your feedback on the hypex plate amps too.

I've got about 10-12 of em floating round in mostly studio monitors and hifi I've built for mates.

The first batch of em felt like they had almost a 40% failure rate but they swapped everything out which was annoying but not a big deal.

Prices have raised since then, guessing it's gone into better QC as the new ones don't fail. I've got ones still working in cabinets that have been dropped so hard the tweeter has come out. If they had FIR they'd be killer. Not sure about em on PA use tho, haven't tried.

Only had time to do some basic time/phase stuff, I'll finish up the EQ before I hand em over :)

30cm and 65cm measurements merged, no smoothing


Same but with psychoacoustic smoothing




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Post Options Post Options   Thanks (0) Thanks(0)   Quote vertx Quote  Post ReplyReply Direct Link To This Post Posted: 23 September 2021 at 9:43am
The flare ratio is based on the Comsol paper TG posted a while back. It sounds good.






Edited by vertx - 23 September 2021 at 9:47am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote infrasound Quote  Post ReplyReply Direct Link To This Post Posted: 23 September 2021 at 8:10am
So.. what's this "special" port? Geek
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JonB67 Quote  Post ReplyReply Direct Link To This Post Posted: 22 September 2021 at 9:43pm
Fantastic work vertx. 

If it sounds as good as it looks you're onto a winner.  Let us know your feedback on the hypex plate amps too.
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Young Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vertx Quote  Post ReplyReply Direct Link To This Post Posted: 22 September 2021 at 1:10pm
Hopefully sort the grille out for the sub in the next few weeks to complete the build.

Currently paired up with a fun active 3-way HiFi I got to build for a mate








The tops have a very special 3D printed port ;)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JulianDA Quote  Post ReplyReply Direct Link To This Post Posted: 13 September 2021 at 12:48pm
Very good work! I really like the additional pieces of wood on the front. They give the whole cab a much more interesting look Clap I think just a black grille without foam will look superb on this little sub Thumbs Up

PS: I also had the idea of the recessed reflex ports with routered ends in my head for a while...your build convinced me to definately use this technique in my next cab! 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vertx Quote  Post ReplyReply Direct Link To This Post Posted: 13 September 2021 at 11:45am
Couple more pics after a few coats of poly

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Post Options Post Options   Thanks (0) Thanks(0)   Quote vertx Quote  Post ReplyReply Direct Link To This Post Posted: 13 September 2021 at 11:38am
Thomann Ships the BMS to Australia via their online store.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Greg32 Quote  Post ReplyReply Direct Link To This Post Posted: 13 September 2021 at 10:36am
Nice compact cab well done. where did you order the bms from? Ta
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vertx Quote  Post ReplyReply Direct Link To This Post Posted: 30 August 2021 at 11:59am
Got the port flanges for the inside added, then glued on and rounded over the top.

Remeasured with the DATS and found a lot of the 100 - 350hz imdedence ripples/cabinet resonances were now gone with the top glued on.

Tried also with R1.7 rockwool but preferred the R2.5 Earthwool which I got covered up in fabric.

Gave it a propper run-in over the weekend, two 12hr sessions, 6 hours of which the clip light blinked every now and then. Safe to say it's a great sub and much better than the Yamaha in the same room.

If I was upping the amp to 1000w The ports would need to be redone to vent more air, with my ear to the port at full tilt I can hear some minor vent turbulence.




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