in search of a "low q" 8" sub

[theAnonymous1]

I'm looking for a "low q" 8 inch sub to be used in a very small passive radiator sub design. I want to try and keep the whole thing under 10" cubed using 3/4" mdf. It needs to handle at least 100 watts rms and have good excursion. Any and all suggestions (except any about using a different design) are greatly appreciated.


Thanks in advance,


Sean

[Bill Fitzpatrick]

n/a

[sreten]

10" cubed using 3/4 inch MDF ?

= 8.5" cubed internal = 0.35cuft = 10.1L.

Nearly half of the external volume (0.58 cuft) is MDF.

An 11" cube gives 0.5 cuft -14L , 12" 0.67 cuft - 19L.

the 8" Tangband sub looks ideal :

http://www.creativesound.ca/details.php?model=W8740C

note : apparently Xmax is genuine, 24mm both way.

sreten.

[sreten]

sreten

[theAnonymous1]

That Tang Band driver looks like it will work great. Thanks alot sreten.

[BillFitzmaurice]

A sub project using the TB 8 was in the last two issues of audioXpress magazine. Another contender at a very low price is the MCM 55-2421.

[fgomes]

I'm using winisd and get very long tubes for the 14 liter cube you sugest (11" cube), tuned to 28 Hz (Winisd sugests 92cm long port, with a diameter of 6.8 cm)
Am I making something wrong? How are you going to put a 92 cm long tube in a 28cm cube? You posted also winisd plots, so can you tell me what vent sizes have you obtained?

Thanks

Fernando

[Volenti]

He's using a passive radiator, not a port.

[indoubt]

For a cube this size the tangband W8-740 is probably the best choice. There are other very nice 8" subs as well but most of them like bigger boxes. For a box that is a little bigger an Intertechnic MDS08 is a good contender too (nice kevlar membrane, casted chasis).

Fgomes: for BR in such little box, try calculating 3 br ports 20mm internal dia each( copper 22mm water tube?) Raise the Fb to 36Hz, tubes will be approx 130-140 mm long. Is that 14 L nett??