Velleman speakerunits?

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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 1½" Vc should be good for say 50-150W and that will be enough

Here´s 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)Â 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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I'm using a shared computer right now and i can´t download program.

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

I´m 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
 
Re: Welleman speakerunits?

TroelsM said:

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.
 
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
 
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
 
Re: Welleman speakerunits?

TroelsM said:
From the specs it looks like a descent speaker:

Here´s 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)Â 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



Last question: where did you find this data??
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.