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Old 16th August 2006, 09:17 AM   #1
TroelsM is offline TroelsM  Denmark
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Default Welleman speakerunits?

From the specs it looks like a descent speaker:

It's dirt-cheap (approx 15 euro)

Could someone with a Speaker-Cad-program run the numbers and tjeck performance in a 15-25L bass-reflex box?

I'm thinking of:
1) A sub with 2 of these
2) or a party-speaker with 2 subs and a high-freq horn?

If the unit actually can witstand 250W RMS I'll be very suprised, but a 1" Vc should be good for say 50-150W and that will be enough

Heres the data:

Velleman VDSSP8/8

Impedance (Z) 8

Resonant frequency (fs) 35Hz

Max. frequency range f3-6,000Hz

Music power 350WMAX

Power rating (P) 250WRMS

SPL (1W/1m) 91dB

Suspension compl. (Cms) 0.25mm/N

Moving mass (Mms) 65g

Mech. Q factor (Qms) 4.95

Electr. Q factor (Qes) 0.66

Total Q factor (Qts) 0.58

Equivalent volume (Vas) 43 l

DC resistance (Re) 6,4

Force factor (BxL) 12.6

Voice coil induct. (Le) 0.8mH

Linear excursion (XMAX) 6mm

Any ideas?

Regards Troels M
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Old 16th August 2006, 09:39 AM   #2
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Why don't you download Unibox, then you can play with box designs to your heart's content?
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Old 16th August 2006, 09:42 AM   #3
TroelsM is offline TroelsM  Denmark
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I'm using a shared computer right now and i cant download program.

Otherwise you're absolutely right. I would like to download some SW soon and try it.

Im also sharing the data and picture of the welleman unit because I haven't seen them before and from the data the look promising.

I'm not trying to get you guys to do my work...

Regards TroelsM
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Old 16th August 2006, 10:01 AM   #4
sreten is offline sreten  United Kingdom
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Default Re: Welleman speakerunits?

Quote:
Originally posted by TroelsM

Could someone with a Speaker-Cad-program run the numbers......

Regards Troels M

Hi,

just by inspection I can tell you a 15 - 25 L bass reflex is out of the
question as Qts is too high for reflexing. Sealed Q= 0.9 to 0.8 is
probably as good as its going to get. For this you need a sealed
box of effective volume 29L (0.9) to 43L (0.8). Note any box bigger
than Vas, Vas will dominate so for Q = 0.7 you need 90L.

/sreten.
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Old 16th August 2006, 05:55 PM   #5
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Is this an 8" driver? I played with the numbers a little bit with that assumption and it looks to me like either a 50-55 liter sealed box or a 3m or so tappered TL would be the best bet. I am not sure whether a back horn would work or not but the Q seems on the high side for that. As others have pointed out a ported box for this driver would be quite large (over 130 liters. BR does not seem to be appropriate.

mike
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Old 18th August 2006, 07:48 AM   #6
TroelsM is offline TroelsM  Denmark
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Hi and thanx for the answers. The unit is (as far as I know) not meant to be a hifi-speaker. It's build to be a "pro" unit.

I must admit that my speaker-theory-knowledge is pretty forgotten, but I seems to me that it should be possible to make a ported box with less volume than 130L... -although it might not have the best performance.

I should probably download some SW soon and start playing around. What the best programs out there?

Regards
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Old 18th August 2006, 09:55 AM   #7
sreten is offline sreten  United Kingdom
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Hi,

You can't make a ported box with any sort of reasonable box volume.

TL / MLTL loading would probably be the best for extended bass, I'm
no expert in this field but box volume again is not going to be small.

/sreten.
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Old 18th August 2006, 05:35 PM   #8
Salas is online now Salas  Greece
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Old 10th December 2006, 09:08 PM   #9
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I have this speaker too, and i can't calculate the box ;/
who can help me? i want box with fazoinverter..
help me, please


and sorry for my bad english..
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Old 25th August 2008, 03:22 PM   #10
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I'm trying to make a box too but i cant calculate it, i want to put it in my carso i must know how much Liters did i need and witch reflex pipe i need.
(i think its about 15L)

i have Winsub but i dont understand everything

so, thank you for replying!!!
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