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12" Sub Build With BMS12N630 |
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toastyghost 
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Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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 Topic: 12" Sub Build With BMS12N630Posted: 02 October 2021 at 5:28am |
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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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vertx
Young Croc 
Joined: 14 March 2012 Location: Sydney Status: Offline Points: 578 |
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Posted: 02 October 2021 at 4:45am |
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The grille for the sub is on it's way thanks to Markie
 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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vertx
Young Croc
Joined: 14 March 2012 Location: Sydney Status: Offline Points: 578 |
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Posted: 23 September 2021 at 10:04am |
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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vertx
Young Croc
Joined: 14 March 2012 Location: Sydney Status: Offline Points: 578 |
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Posted: 23 September 2021 at 9:43am |
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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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infrasound
Old Croc 
Joined: 13 May 2011 Location: Brizzle Status: Offline Points: 2276 |
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Posted: 23 September 2021 at 8:10am |
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So.. what's this "special" port?
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JonB67
Young Croc
Joined: 22 April 2016 Location: UK Status: Offline Points: 1376 |
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Posted: 22 September 2021 at 9:43pm |
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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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vertx
Young Croc
Joined: 14 March 2012 Location: Sydney Status: Offline Points: 578 |
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Posted: 22 September 2021 at 1:10pm |
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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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JulianDA
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Joined: 29 May 2018 Location: Soest, Germany Status: Offline Points: 114 |
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Posted: 13 September 2021 at 12:48pm |
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Very good work! I really like the additional pieces of wood on the front. They give the whole cab a much more interesting look
 I think just a black grille without foam will look superb on this little sub 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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vertx
Young Croc
Joined: 14 March 2012 Location: Sydney Status: Offline Points: 578 |
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Posted: 13 September 2021 at 11:45am |
 Couple more pics after a few coats of poly
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vertx
Young Croc
Joined: 14 March 2012 Location: Sydney Status: Offline Points: 578 |
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Posted: 13 September 2021 at 11:38am |
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Thomann Ships the BMS to Australia via their online store.
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Greg32
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Posted: 13 September 2021 at 10:36am |
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Nice compact cab well done. where did you order the bms from? Ta
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vertx
Young Croc
Joined: 14 March 2012 Location: Sydney Status: Offline Points: 578 |
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Posted: 30 August 2021 at 11:59am |
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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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JonB67 wrote: