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Adding subs to my factory system


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larry5061 
Member - Posts: 5
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Joined: June 06, 2016
Location: Idaho, United States
Posted: June 13, 2016 at 3:11 PM / IP Logged Link to Post Post Reply Quote larry5061
I am installing subs in my 2007 jeep Grand Cherokee to the O.E. system
The specs on both are as follows.
12inch PP Cone   
Subwoofer Specifications
Sensitivity: 90 dB / W / m
Frequency Response: 28 Hz - 800 Hz
Cutout Diameter: 10-13/16inch
Mounting Depth: 5-1/2inch
Gross Weight: 9.7lbs
Weight of Magnet (Woofer): 1.6lbs   
Amplifier Max Power
400W   
Amplifier Rated Input Power
4 ohms 60W x 2
2 ohms 75W x 2
Bridged 150W x 1   
Amplifier Specifications
Signal to Noise Ratio: 95 dB
Low Pass Filter: 80 Hz (-18 dB / oct.)
Size(inch): (W)8-7/8" x (H)2-3/16" x (D)7-1/16"
Weight(lbs): 2.8
larry5061 
Member - Posts: 5
Member spacespace
Joined: June 06, 2016
Location: Idaho, United States
Posted: June 13, 2016 at 3:16 PM / IP Logged Link to Post Post Reply Quote larry5061
Im reference to adding subs to 2007 Jeep Grand Cherokee.
I have 2 of the Kenwood amps.
My question is would it be more beneficial to run 1 amp and bridge for both subs or run each sub with their own amp in bridge mode??
Sorry for the screwed up post
Thanks in advance
i am an idiot 
Platinum - Posts: 13,666
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Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 13, 2016 at 5:40 PM / IP Logged Link to Post Post Reply Quote i am an idiot
We need to know the important things about the woofer. Single or Dual voice coil? What is the impedance of the coil(s)?
larry5061 
Member - Posts: 5
Member spacespace
Joined: June 06, 2016
Location: Idaho, United States
Posted: June 13, 2016 at 7:27 PM / IP Logged Link to Post Post Reply Quote larry5061
I really screwed up this post, I apologize.
single voice coil, 8 ohm
i am an idiot 
Platinum - Posts: 13,666
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 13, 2016 at 8:23 PM / IP Logged Link to Post Post Reply Quote i am an idiot
If you use both amplifiers each woofer will get 120 watts. If you use 1 amp, each woofer will get 75 watts. Mathematically speaking you will have more power if you use both amplifiers.
larry5061 
Member - Posts: 5
Member spacespace
Joined: June 06, 2016
Location: Idaho, United States
Posted: June 13, 2016 at 9:12 PM / IP Logged Link to Post Post Reply Quote larry5061
i am an idiot wrote:
If you use both amplifiers each woofer will get 120 watts. If you use 1 amp, each woofer will get 75 watts. Mathematically speaking you will have more power if you use both amplifiers.
If you don't mind me asking how did you come up with those numbers.
Thank you
i am an idiot 
Platinum - Posts: 13,666
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 13, 2016 at 9:26 PM / IP Logged Link to Post Post Reply Quote i am an idiot
You posted them. A 4 ohm stereo load is exactly the same as an 8 ohm mono load. You posted 2 x 60 into 4 ohms. That = 120 into an 8 ohm mono load.
A 2 ohm stereo load is the same exact thing as a 4 ohm mono load. 75 x 2 into 2 ohms = 150 watts into a 4 ohm mono load. 2 paralleled 8 ohm drivers = a 4 ohm mono load.

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