Model
Rockford Fosgate P18S4
Rating
Attention! Parameters of that speaker were not checked: a source of data, manual were not found.
DIAM
8"
FS(Hz)
35
VAS(l)
16
QTS
0.52
PWR(W)
300
SPL(dB)
83
IMP(Ohm)
4x0
avb
NOPROD
+156 P-Bass
18 Oct 2021, 16:45
Some parameters of the speaker used for this project differ from the stored in the database.
Enclosure
Vented, Vb: 7.2l, Fb: 30.8Hz
+156 P-Bass
18 Oct 2021, 14:37
Some parameters of the speaker used for this project differ from the stored in the database.
Description
I noticed that SBL's database many parameters are missing at this driver, so first, I searched them on the manufacturer's website, put in WinISD + let calculate the missing parameters, double checked using BassBox6PRO + let it calculate the missing ones, and at least these I fill in here into SBL + let calculate the missing ones. The Vb of this box I determined using WinISD for the same reason why I determined at the closed boxes at bigger P1 drivers + designed the box the same way.
Enclosure
Closed, Vb: 5.9l
Description
I determined all driver parameters like in the closed box's project. WinISD with at some settings not gived ideal RMS power handling down to 20Hz even for closed box's Vb for port areas which just not higher than 35m/s vent air velocity in WinISD. So I designed a "max flat" box for 55Hz/12 dB cabin gain using SBL's simple model by chosing 1 of the Vb-Fb-port area combinations which were OK in WinISD + complex model giving same SPL between it's peaks like simple model at high Hzs.