When using simulation software... (1 Viewer)

[Shawn Solar]

Do you have to compensate for dual voice coils. If say you have dual 2 ohm coils would the T/S change whether it were series or parallel? For instance QTS, QMS and QES change in regards to the resistance? any formulas? thanks.

I ask cause I'm working on a sub project with a friend(spl monster) using a driver with these parameters:

RFR3115
FS-22hz
DC-resistance-2x2.16ohms
QTS-.388
QES-.41
QMS-5.837
SD-860cm^2
VAS-98L
Moving Mass-384g
CMS-1.28E-04 m/N
Voice Coil Inductance-1.74mH
BL-12.85Tm
XMAX-19mm
SPL-88db
Pmax-1000watts

We are devising a plan on using a slot port for tuned to 35hz in a 21cuft enclosure using 4 drivers wired in voice coils in series and two woofers series then at the amp the 2 pair is wired in parallel for 4ohms. Then we may be making a baffle with a set of ports that can be tuned lower for SQ. They will fit through and cover the slot port with some sort of mounting system.

 

[Shawn Solar]

Just to add in a new post. First I meant to change the title, second I am wondering if maybe he should build four new enclosures each with multiple ports. That way he could do a SVS thing and be able to change the tuning frequency. The main problem with it right now is even though its loud(155db) it don't sound good and he wants a combo system ie, be able to do spl and make a few adjustemenst for sq when he's cruising.

 

[Michael R Price]

Shawn, the parameters don't really change but if enough power is available, series wiring may sound better due to improved damping factor. It seems perfectly fine to use 2 or 3 ports, with 2 ports closing one will change the tuning by 1/2 octave and with 3 ports, closing one reduces tuning by close to 1/3 octave. One of my friends uses a Tempest at home with 2 ports to switch between 15Hz and 21Hz tuning, which works fine. The problem is getting some kind of plug that stays stuck in the port!