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Old 22nd March 2010, 07:19 AM   #1
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Default Best bass design using Visaton W200S?

I have a pair of Visaton W200S available to provide some bass for my bedroom system. I had the not too original idea that I could make a pair of subwoofers that would look like stands and I could put my two ways speakers on top (these high pass at 65Hz).

I am looking to achieve 30 to about 80Hz (or a bit more). Keeping the cabinet relatively slim and about 500mm tall is the idea. Sound quality is important.

I saw an interesting 6th order band pass design using these drivers but I am not convinced about them for sound quality above 50Hz. I have 100W to drive them so I would like a design that is reasonably efficient.

I appreciate any suggestions

The specifications for the driver are as follows:

Technical Data:
Rated power 75 W
Maximum power 115 W
Nominal impedance Z 8 Ohm
Frequency response fu6000 Hz
Mean sound pressure level 88 dB (1 W/1 m)
Angle of sound emmision 48/4000 Hz
Maximum cone displacement +/−10 mm
Resonance frequency fs 30 Hz
Magnetic induction 1,1 T
Magnetic flux 600 Wb
Height of front pole-plate 5 mm
Voice coil diameter 35 mm
Height of winding 12 mm
Cutout diameter 184 mm
Net weight 1,5 kg
D.C. resistance Rdc 6,0 Ohm
Mechanical Q factor Qms 3,59
Electrical Q factor Qes 0,36
Total Q factor Qts 0,33
Equivalent volume Vas 70 l
Effective piston area Sd 214 cm
Dynamically moved mass Mms 26 g
Force factor Bxl 9,0 Tm
Inductance of the voice coil L 2,2 mH
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Old 22nd March 2010, 07:37 AM   #2
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Sounds like you have Visaton drivers available to you. You'll need

Visaton - Lautsprecher und Zubehr, Loudspeakers and Accessories - download boxsim 1.1, and the lastest driver updates.
You will also need BoxSim , because the software (albeit very good) is all in German.

I'm not sure on the box size you've specified. To get the most out of Visaton woofers, they tend to need bigger boxes (18 litre for the 5" version).
50L (per driver) tuned to 30Hz gets a decent response. However, the efficiency is low at 82dB.

Edit - it sounds like you're following a similar path to me. I ended up with a pair of Dayton DVC woofers in a 42L sealed box, with some serious Linkwitz gain behind them.

Chris
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Last edited by chris661; 22nd March 2010 at 07:41 AM.
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Old 22nd March 2010, 08:35 PM   #3
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Hi Chris

thanks for your reply. I have looked at the recommended ported boxes for this driver on the visaton site and I was thinking like you that it lacked efficiency and needed to be large for low FR. Maybe it's the driver!!!

However, I was also wondering what this driver could do in a tapped horn or some other configuration where the cabinet design is doing more work.
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Old 22nd March 2010, 09:06 PM   #4
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Hmmm...
The lack of efficiency will be partially offset by room gain.

I'm not much help on horns I'm afraid - in my opinion, there's some serious voodoo there. I understand (sort of) how full size horns work, but tapped horns are closed books to me.
Looking at the dimensions you've given, I'd say you're looking at a sealed design. I doubt a horn would fit in there. Add some Linkwitz gain, you'll be getting somewhere low. One more thing - watch the maximum excursion - the +/- 10mm is peak to peak. I know this because mine (W130S 8ohm) move around 4mm peak to peak before hitting the stops.

Chris
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Old 23rd March 2010, 01:42 AM   #5
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by Antripodean View Post
..or some other configuration where the cabinet design is doing more work..
Hi Antripodean,

For SQ and at bed room SPL: s: Here is a design that might suit:

b
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File Type: gif Visaton-V200S-T-TQWT.GIF (153.8 KB, 318 views)
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Old 23rd March 2010, 08:15 PM   #6
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Many Thanks Bjorno, it looks reallygood Can it fold in half (to halve the height)? and keep the same efficiency/FR?
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Old 24th March 2010, 03:02 AM   #7
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by Antripodean View Post
Many Thanks Bjorno, it looks reallygood Can it fold in half (to halve the height)? and keep the same efficiency/FR?
Hi Antripodean,

Yes you can and you wont lose overall SPL more than a fraction of a dB in the passband if your fold preserves the minimum requirements of the CSA: s in the bends.

This will make the height of the speaker shorter and as a bonus the folds will LP attenuate the wiggling FR mostly above the targeted passband, more than the stuffings does, at least parts of the BW also but depending of the airways section lengths and the of the degree of the bending.

IME, if you fold only ones you need stuffings in about half of the line, but about a third is enough if folded more.

So far Ive made 8 T-TQWTs and all turned out very well compared to earlier built TLs/TQWTs/ QWP: s and MLTL: s.

See a couple of small (the cut and paste pictures here below from last year spring and summer) more than once folded T-TQWTs using buyout and scrap drivers that really sounded IMO very good in their new enclosures.

b
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File Type: jpg PC-bass.JPG (167.7 KB, 270 views)
File Type: jpg T-TQWT_Eltax Atomic-A-8_1.JPG (302.2 KB, 260 views)
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Old 24th March 2010, 04:19 AM   #8
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Thanks again Bjorno. Really appreciate the extra pics and explanation. Looks like there is going to be some sawdust this easter
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