QuestionQUESTION: i have 2 kicker L7 12" with different impedance. one is 4ohm and the other is 2ohm. is it able to combine them in parallel or series? what is the impedance after combining? and it able to use one amp to control them? i am using amp Venom VD2600S.
the amp spec is: output power @4ohm is 600W
@2ohm is 1200W
@1ohm is 2400W
thanks in advance
ANSWER: Hi Eddy,
Combining two subs with different impedance ratings on the same amplifier can be done, but there's a big disadvantage: the power produced by the amplifier won't be divided evenly. One sub will end up getting twice as much power as the other sub. That makes adjusting the amplifier's gain control very difficult, and increases the chances that you'll damage a sub from over-powering.
Because the subs are a dual voice coil design, you'd have a few options for how they could be wired. Depending on the wiring setup, the final impedance at the amplifier might be 2.67 ohms, 1.33 ohms, or 0.67 ohms. (The two subs should be connected to the amp in parallel, but the individual voice coils on each sub might be wired in parallel or series. Wiring each sub's voice coils in series would give you the 2.67 ohm rating).
Hope this helps!
Brian
---------- FOLLOW-UP ----------
QUESTION: i bought a kicker solobaric L7 about a week ago. i was
told it is the 2ohm impedance type. but when i saw
the backside of the sub, i found that the first coil just
ve a different impedance in the pos(+)4ohm and
negative(-)2ohm. and the second coil is also the
same. what is the impedance type of this L7? i am
just wondering how to combine this one to my 2ohm
solobaric. and what is the impedance will i got if i
combine them in parallel or series? and also can i use
a single monoblock amp Venom VD2600D to control
these 2 subs?
the amp spec is: output power @4 ohm : 600W
@2 ohm : 1200W
@1 ohm : 2400W
thanks in advance for the answer.
AnswerHi Eddy,
I'm not clear how you're measuring the impedance of the subwoofer. Each terminal is at one end of the voice coil, so to measure the impedance (or, more accurately, the DC resistance) of a voice coil using a multimeter, you'd take a resistance reading between the positive and negative terminal. It's not possible to measure the impedance of a single terminal, so I'm not sure how you're seeing a different impedance at each terminal.
If this is, in fact, a 2-ohm DVC subwoofer, and is identical to the other sub, then your best option is a series/parallel configuration: each sub is wired with its voice coils in series, then the two subs are connected to the amp in parallel. This would result in a 2-ohm load at the amplifier, resulting in a rated power output of 1200 watts. Each sub gets half the power output, so it would be just about right for a pair of 12" L7's.
Here's a link to a diagram of a series/parallel wiring setup. It can be found on JL Audio's tutorial page, which is a very useful site to bookmark.
http://mobile.jlaudio.com/graphics/Support/Tutorials/wiring_images/DVC_Series_2.
Hope this helps!
Brian
