Beyma 12BR70. Min ported enclosure needs

[youknowyou]

anyone have the winsd file for the 12br70?
I try to enter the data in winsd but it doesnt seem to work at all

Im about to build a floorstander, ported. and im debating in my mind if I want 60L or 100L ported cab.
any thought?

 

[youknowyou]

oups, can mod move this to multi-way, sorry

 

[vinylkid58]

I try to enter the data in winsd but it doesnt seem to work at all

Don't forget, Winisd will "auto calculate" some of the fields for you.

jeff

 

[ianbo]

The 12BR70 has a Qts of 0.5. Surely that's too high for a ported box?

 

[youknowyou]

The 12BR70 has a Qts of 0.5. Surely that's too high for a ported box?

Then
what would be the min sealed enclosure liter to make the 12br70 happy?

 

[ianbo]

Well, a quick sim suggests that 100 litres would give a Q of around 0.7, with a bit of stuffing. If the box is only 60 litres, the Q is around 0.8. That's quite high, but some would say it's fine.

 

[Richard Ellis]

Ran the numbers thru Winisd & I got this...internal volume, 288.3 liters, a tuned frequency (fb) of 28.1 hertz, choosing a round port of 200 mm size, it came out at 260mm long, velocity was fine. Response is at -2.99 Db @ 25.3 hertz....
All in all just fine...The efficiency bandwidth product came in at 62.5...a little "all purpose" for ported or sealed, but sims out just fine...let alone hot-rodding the tuning for a deeper response.




--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Rick...

 

[youknowyou]

Ran the numbers thru Winisd & I got this...internal volume, 288.3 liters, a tuned frequency (fb) of 28.1 hertz, choosing a round port of 200 mm size, it came out at 260mm long, velocity was fine. Response is at -2.99 Db @ 25.3 hertz....
All in all just fine...The efficiency bandwidth product came in at 62.5...a little "all purpose" for ported or sealed, but sims out just fine...let alone hot-rodding the tuning for a deeper response.




--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Rick...

Many thx
ill build a 80l cabinet!

 

[Richard Ellis]

80 Liters sealed? , you're hampering the performance capabilities thus...an F3 at 50.88 hertz along with a Qtc of 0.83 ... a bit on the "flabby bass sound", critically underdamped.



-------------------------------------------------------------------------------------------------------------------------------------------------------------Rick...

 

[youknowyou]

80 Liters sealed? , you're hampering the performance capabilities thus...an F3 at 50.88 hertz along with a Qtc of 0.83 ... a bit on the "flabby bass sound", critically underdamped.



-------------------------------------------------------------------------------------------------------------------------------------------------------------Rick...

80l ported?
if sealed, whats the min size for best performance?

 

[Ciu]

Hello !

Vol min No serie resistance
Vol max serie resistance = 0.6 ohms
Closed :
Vol : 43 L f-3db : 70 hz SPL max 93.4db R series 0 ohms
Vol : 52.8L f-3db : 64.4 SPL max 93.1db R series 0.6 ohms
Ported :
Vol : 84.05 L f-3db : 43.6 hz SPL max 93.4 db Port D : 100mm Port L 118.5mm Port F 39.32hz R series 0 ohms
Vol : 110.15 L f-3db : 38.3hz SPL max 93.2 db Port D : 100mm Port L 93.7mm Port F 36.54hz R series 0.6 ohms
Hope this help !

 

[tigeranand]

80l ported?
if sealed, whats the min size for best performance?

Hi Did you make any box for your Beyma 12br70 would like to know your opinion