BMS 18n862

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poseidonsvoice

poseidonsvoice

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#1
Folks,

Can one of you confirm these measurements on a production sample of the BMS driver? I don’t have one in front of me. I am seeing if it will fit in a front baffle that I am considering.

Is:

The outer diameter 458 mm or 18.031 inches?
The inner diameter 412 mm or 16.22 inches?
The difference between the outer and inner diameters 46 mm or 1.811 inches?
The depth recess 16mm which is 0.62 inches?

Those are specs from BMS’ datasheet.

Thanks,
Anand.
 
#3
To reconfirm....... yes, datasheet specs are accurate...

Here's a couple of the ported boxes i built with them..
 

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#7
Zero D said:
@ mark100

Ooh La La 😱 😉

And i guess that's just one side of a stereo pair ?

Nice pro looking finish on them 🙂 What's inside them ?
Click to expand...

🙂 Thx!

Nah, I only have one more of the 12" and horn stacks, a total of 4, for 2 a side for stereo.
Depending on how well they measure arrayed, and whether I can figure out a good way to add enough sub power, I'll build another pair for 3 a side, as in pict. Just beginning to test them...

rcf mb12n351's, and bms 4594HE's on xti1464's

parts I borrowed from the Peter Morris DIY's on sound forums that I built (killer boxes btw)
I'm playing around with my design a trying to learn a little....
 
#11
I have the above mentioned VC issue here and mentioned, I know it. See above.

I was refering to "klippel data" on data-bass site - there is no indication whether these TSP are derived from a klippel measurement (does Josh use/own a Klippel analyzer?), nor are there any measurments typical for a klippel data set. Since EPA mentioned Klippel data, I asked where to find, since I couldn´t find any on the linked page.
 
#16
Hi mark whats the specs

Hi Mark

whats the specs on those 18" cabs.

Size and ports.

Do you know how they measure?

Just bought 2 of those 18N862 myself and was thinking on building the enclosures on data-bass.com from their tests

best regards

uwe
 
#17
Funny. In preparation for a move I've decided to go a different route with my system. I'm comfortable with the disadvantages of push pull. Very uncomfortable with unavailability of ns18 as I wanted a clamshell and until may that is a nope since I only have one.. How common is this since the problems at aurasound after change in ownership? Will the one I have never used be a paperweight like a mfw15 in the future if I screw up? The bms driver spoken of seems to fit my situation based on just the two points above. Would start with one setup at 14-20 cubes mainly vertical that I can work into art. Mdf to start...if I like, vertical bamboo ply will be used for final design with metal rod bracing if I can find some focus and it makes sense. A second unit would come later. Looking for 95db in a smedium room flat from 15 hz or so...clean. Goals are low and top sound quality.

Side note, I heard a sound bar that sounds better than my active "main" speakers at low volume. Guess I'll be going full diy like I first planned to do.
 
#18
heinz1964 said:
Hi Mark

whats the specs on those 18" cabs.

Size and ports.

Do you know how they measure?

Just bought 2 of those 18N862 myself and was thinking on building the enclosures on data-bass.com from their tests

best regards

uwe
Click to expand...

Hi Uwe, my single 18"s are about 160-165 liters net, with 60 in^2 port, and port length of 17".

I went with a little larger volume and ports than data-bass, to get a bit lower Fb and hold down port velocity
 
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#19
Any drawings and/or measurements

Hi Mark

Any drawings and/or measurements? Maybe pictures of the finished subwoofers
or doing the build?

Is there more than one port?

How do they perform?

I made my last speakers with OSB. Partly to try it out, and to see the difference between what I normally use, MDF.

With these BMS drivers (they are really expensive) I want to go all in and use birch plywood. But plywood is real expensive too, so I do not want to fool too much around and get the right design the first time.

Your build is like 20 liters bigger than the data-bass cab. can one person handle it?

best regards

uwe
 
#20
heinz1964 said:
Hi Mark

Any drawings and/or measurements? Maybe pictures of the finished subwoofers
or doing the build?

Is there more than one port?

How do they perform?

I made my last speakers with OSB. Partly to try it out, and to see the difference between what I normally use, MDF.

With these BMS drivers (they are really expensive) I want to go all in and use birch plywood. But plywood is real expensive too, so I do not want to fool too much around and get the right design the first time.

Your build is like 20 liters bigger than the data-bass cab. can one person handle it?

best regards

uwe
Click to expand...

Hi Uwe, yes I purposely built a little larger than data-bass for longer ports and hopefully reduced vent noise down low. Seems to have worked well.

Internal dimensions are 560Wx560Hx650D. I used 15mm birch for everything except the baffle, which is 18mm. Outside dims are 590x590x755.
755D is to extend beyond driver and allow for grill (maybe extra depth isn't need for home use? ).
Whole thing weighs 41kg.

4 triangular corner ports, 14cm base and height. 43cm long.

The only thing I would do different is move the handles closer to the front.

Check out this thread for measurements, and picts a few posts in...
diy single 18"s and OS

Good luck! You're gonna love those drivers 🙂
 
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