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BMS drivers in X12 |
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jerronimo 
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 Topic: BMS drivers in X12Posted: 27 August 2009 at 6:33pm |
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Hi guys,
I'm planning on building a set of X12's, the subs will probably be X1's.
The standard Paudio drivers are very difficult for me to get, but I can get BMS drivers at very respectable prices:
BMS 12S310 @ 149,- euro 400 watts
BMS 12S320 @ 155,- euro 500 watt's
BMS 12P200 @ 134,- euro 400 watt's
Precision devices 12SB30 @ 109,- 400 watt's
BMS compression driver H4550 @ 122,- euro's 80 watt's
All these have better spec's than the original Paudio drivers and BMS recommends these as low mid drivers in compact cabinets.
Anyone got experience with one of these?
Also I want to use a passive filter, but how does that work when u got two woofers? |
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Tony Wilkes
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Joined: 02 August 2004 Location: West Midlands Status: Offline Points: 4835 |
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Posted: 29 August 2009 at 9:04am |
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Either the 12S310 or 12S320 would work very well for you crossed at 1k to the 4550.
I personally would go for the Neo versions which are the 12N610 or 620's although this is just because of the weight issue. Also think about the Neo comp 4552nd as I think this gives a small but noticeable improvement on the 4550. The ultimate pairing would see a pair of 12N620's twinned with the 4592 co-axial compression driver. This is the arrangement used in the Tannoy VQ60 and Coda RX35 and really will be difficult to beat at any price. Tony My 12N620's - 4552nd  Edited by Tony Wilkes - 29 August 2009 at 9:10am |
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jerronimo
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Posted: 29 August 2009 at 9:52am |
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Hi Tony,
Thanks for the reply, also got your PM will think about it.
Weight is not a real issue for me, as we will be installing and moving them with two people.
But I'm a bit confused, when I look at the specsheet of the 12N620BMS and the other woofers I mentioned I see this:
Recommended reflex enclosure: 17L/62Hz, -3dB=75Hz, BRD=80mm/148mm long 25L/60Hz, -3dB=63Hz, BRD=100mm/177mm long Your speakers look like they have a bigger volume then the recommended 25 liters.
What design did you use? The standard X12 but with straight sides? Are the reflex ports in the back?
They look very nice btw!
That 4592 is a beast of a driver! 300-20.000 Hz! Never seen anything like that before. Edited by jerronimo - 29 August 2009 at 9:58am |
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Tony Wilkes
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Posted: 29 August 2009 at 10:28am |
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Don't forget that there is two drivers so that in the picture above the volume is a nominal 50L and tuned as per BMS at 60hz.
The ports are on the back and as with most reflex enclosures the shape can be pretty much what takes your fancy. I always tend to design slim and deep. The 15" reflexes below are a nominal 80L and have BMS 15N830v2 drivers in them Tony |
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jerronimo
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Posted: 29 August 2009 at 1:40pm |
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Oke that makes sense
Just simulated a couple of drivers in bassbox pro:
Enclosure volume was 50 liters with two 100mm diameter BR ports with a length of 197mm.
Simulated the BMS 12S320, BMS 12P200 and Precision devices 12SB30
The 12S320 and PD12SB30 gave very similar graphs exept the PD gave a bit more SPL output between 50 and 100 Hz, the 12P200 didn't even come close.
So I have to choose between the PD and BMS the PD is a bargain at 109,- euro so I'm steering towards that one.
I assume u use active filtering for yours? What kind of horn do u suggest for the 4550 BMS Compression driver, I hear the 18sound XT1086 is very good but it's huge at 260 x 215 mm!
Edited by jerronimo - 29 August 2009 at 2:07pm |
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cuivenion
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Joined: 30 January 2005 Location: United Kingdom Status: Offline Points: 974 |
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Posted: 29 August 2009 at 3:10pm |
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Hi, great build tony. I was wondering, does the rear porting make it difficult to place the speakers in a corner or against a wall?
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help!!!!!!!!!!
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Tony Wilkes
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Posted: 29 August 2009 at 3:18pm |
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As long as you keep a gap of a least the port dia. away there is no problem.
For most 12" driver boxes anything over 100mm should be sufficient. Also the ports are only really in use when the box is used full range and have little effect when I cross them at 120hz to the subs. Tony Edited by Tony Wilkes - 29 August 2009 at 3:23pm |
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Tony Wilkes
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Posted: 29 August 2009 at 3:23pm |
I use this BMS model http://www.bmspro.info/2119.bms_2119_horn_sound_wave_guide.0.html Active filtering is the way to go because of the high power handling. Tony |
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ceharden
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Posted: 29 August 2009 at 3:34pm |
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The PD 12SB30 is not the tool for the job, it's a low frequency driver and probably won't be great in the midrange. If you're going to go PD in an X12, go for the 12MH25 or PD123ER.
The 18Sound XT1086 is indeed a very nice horn, there are two on ebay at the moment. |
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jerronimo
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Posted: 29 August 2009 at 4:12pm |
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Oke I can get that one for 40,- euro does that sound fair?
The picture you posted is with the 12 inch drivers correct?
When I simulate a cabinet of 55 liters with front dimensions of 900 x 360 mm I get a depth of only 170mm? I can't make the front any smaller because the woofers and horn won't fit...
What dimensions do u suggest?
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jerronimo
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Posted: 29 August 2009 at 4:23pm |
Yes the 12SB30 is more suitable for low frequency applications but the specs on the PD site say it has a freq. range of 45-3500 Hz and I quote ''Also excels in compact two-way cabinets giving extended low frequency capability''
And I can probably cross it pretty low as BMS advices a crossover freq. of 800 Hz for the 4550 compression driver.
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AndyWave
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Posted: 30 August 2009 at 10:18am |
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Hi jerr
I have used BMS4550/Paudio PH4220 (a 1"plastic jbl 90x40 copy) with 812Hz/24LR active crossover in combination with JBL2202 12". The 18sound xt1086 horn looks just enough big for that low crossover freq. If the horn is too small you'll get harsh sound because of not enough loading to the driver at that low xo freq. You'll be knocking the limits here.... 18sound recommends 1k2Hz minimum x/o for xt1086. (that may well be because their own drivers won't do lower with acceptable sound quality  , don't know). Two way systems needs drivers to behave nicely well beyond their intended operating range. Crossover is so near the most sensitive range of human hearing. Obey Cehadrens advice of pd drivers. Andy Edited by AndyWave - 30 August 2009 at 10:51am |
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torturing electrons since ......
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jerronimo wrote: