6 replies to this topic

[H00LiGaN]

Hi guys , i have 2 of the older model Blaupunkt overdrive subs 400rms dvc..Ive decided i want to use 1 in a sealed box for sq and use the other in a ported box for some extra spl.Im after a box size for each type of box, im thinkin around 45-50 litres sealed and about 64 litre ported to about 26hz they sound ok? heres the specs
QTS- 0.400
VAS- 96.28
FS- 24.00hz
Xmas- 13.2mm just out of curiosity would 1 sealed 12" in a largish box be ample for a vl boot? Thanks guys.

[Bassaholic]

Yeah, those sizes sound ok.. You could go a little smaller if you wanted.. One 12 should be ample for SQ, even when its in a VL.

[ July 05, 2003, 19:04: Message edited by: Bassaholic ]

[H00LiGaN]

okie dokie the sealed box is pretty simple i reckon, just been looking at the manual for the subs its mentions 2cft 4th order bandpass with these specs
2cft
f3-low 35hz
f3-hi 75hz
1.1 cft vented front chamber
port tune freq 50hz 3"port 4.7" long
0.9 sealed rear chamber
at the end it says 35-75hz bandwidth crying out for a serious "beating"......hehe ,would that be a good setup in a vl sedan with the port/s up thru the shelf with the boot sealed off?

[H00LiGaN]

also whats the smallest ported box i could go for a nice balance of spl and sq?

[basspimp]

Vented box for the 12" OD is 3cu.ft with a 420mm 4" inside diameter vent. it should give nice rolloff and plenty of low bass. Sealed box would be 1.5cu.ft.

[ July 09, 2003, 18:11: Message edited by: basspimp ]

[Bassaholic]

The problem with the bandpass, is the upper f3 will be less than 75hz once you take into account the cars transfer function - you'd need to tune much higher..

As far as ported boxes go, you could go down to about 1.5 cu/ft net - but of course the port lengths will be pretty long..

[H00LiGaN]

ok thanks for that..
Bassaholic any suggestions as to how high i should look at tuning allowing for the transfer function and what not? Also does the volume of the 2 chambers sound reasonable or should i increase the volume of either 1 ? Thanking you.