Adding subs to my factory system
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=141397
Printed Date: April 29, 2024 at 2:22 AM
Topic: Adding subs to my factory system
Posted By: larry5061
Subject: Adding subs to my factory system
Date Posted: June 13, 2016 at 3:11 PM
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
Replies:
Posted By: larry5061
Date Posted: June 13, 2016 at 3:16 PM
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
Posted By: i am an idiot
Date Posted: June 13, 2016 at 5:40 PM
We need to know the important things about the woofer. Single or Dual voice coil? What is the impedance of the coil(s)?
Posted By: larry5061
Date Posted: June 13, 2016 at 7:27 PM
I really screwed up this post, I apologize.
single voice coil, 8 ohm
Posted By: i am an idiot
Date Posted: June 13, 2016 at 8:23 PM
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.
Posted By: larry5061
Date Posted: June 13, 2016 at 9:12 PM
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
Posted By: i am an idiot
Date Posted: June 13, 2016 at 9:26 PM
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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