Wiring a underseat sub, connect before or after amplifier?


jert123

CarAudio.com Newbie
Jul 19, 2019
3
0
LX
Hello,

Just bought a underseat-subwoofer (Kenwood KSC-SW11).

Since I have the factory HU connected to an external amp (Focal Impulse 4.320) powering the front and rear speakers, should I connect the underseat-subwoofer before or after the Focal Impulse 4.320?

The speakers in the front are hertz focal dieci 165.3 (without crossover) and the rears are the factory ones (extremely under powered in comparison to the fronts).
All the connections are high-level.

Options shown in the figure bellow.

Currently it is like this:
original.png


It can go as option A or option B

Option A
after-amp.png


Option B

no-amp.png



If ones more experienced could provide help would be great.

Best regards,
Jert123
 

Rainman76

CarAudio.com Newbie
Jul 19, 2019
2
0
Alabama
Hello,

Just bought a underseat-subwoofer (Kenwood KSC-SW11).

Since I have the factory HU connected to an external amp (Focal Impulse 4.320) powering the front and rear speakers, should I connect the underseat-subwoofer before or after the Focal Impulse 4.320?

The speakers in the front are hertz focal dieci 165.3 (without crossover) and the rears are the factory ones (extremely under powered in comparison to the fronts).
All the connections are high-level.

Options shown in the figure bellow.

Currently it is like this:
View attachment 6047

It can go as option A or option B

Option A
View attachment 6048

Option B

View attachment 6049


If ones more experienced could provide help would be great.

Best regards,
Jert123
Both of those diagrams are wrong. You will still want front and rear wires for the input of the 4 channel amp. You will need to use the rears, also, for the Kenwood. So, the rear speaker wires will need to feed signal to both.
 

tommydh

CarAudio.com Elite
Mar 31, 2012
539
1
Baltimore, MD
it definitely needs signal pre-amplifier. I would look into a processor or eq that can take the 4 channels and give you 6 AC LC6i
 

bilboaudio

CarAudio.com Newbie
Aug 30, 2019
9
0
Isle of Man
Sorry to hijack, I am wondering the same thing.

So of the options specified out of option A and the revised option B, which was the one to use?

I am in an option B scenario now which works but the sub just disappears.
 
Last edited:
OP
J

jert123

CarAudio.com Newbie
Jul 19, 2019
3
0
LX
I used option B (revised) but keep in mid that my specific sub has built-in amplifier.

EDIT: My sub specifically is weak can only fill the environment, it is not overly powerful.
 

bilboaudio

CarAudio.com Newbie
Aug 30, 2019
9
0
Isle of Man
I have the same sub, thinking of upgrading to the new version ksc-PSW8 as it is more powerful and the same wires and remote can be used.
 

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