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I left it.
 

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When I purchased my used 2014 F150 Supercrew King Ranch, there was a big disappointment with the Sony stereo system. Previously I had a Mazda CX-9 with the Bose system, which had fantastic sound. So I read this thread and added the Polyfil to the subwoofer in an attempt to improve the weak low end. Well, that was probably the easiest and cheapest modification I have done in my life. The low end is much more solid now and the entire system has a richer sound.
 

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Definitely worth the $4 & 10 minutes, still not aftermarket level but that's a whole lot more time & $
 

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I just did this and is it me or I didn’t notice a big difference
 

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After reading online I may have put to much polyfil in my sub enclosure. I ad to push the sub down while I screwed it back in. After work ill take some out and try to just fill it around the magnet with out forcing it shut.
 

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I've been told that, once you defeat the factory bass roll-off, it's not a bad system.
Old thread hoping to resurrect...can someone explain how to defeat the bass roll off? Been looking to accomplish this, as it’s really bothering me that I can’t jam like I used to. (Had a Titan with Rockford factory system that was pretty bad).

Hope someone has some pointers...


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Just an inquiring mind. I am just curious what you are trying to accomplish? What issue were you having? What is bass roll off as well?
There is a fair amount of sound engineering that goes in to designing components, and the void within the sub box has a purpose...
Found 2 good reads to justify the space. Maybe it's not the airspace in the sub that you should be countering BUT the density of the exterior. Maybe a more solid housing to reduce vibration?
Again...I don't know, I'm curious about the situation.
Thanks guys.

Read 1;
How to Calculate Speaker Box Air Space

Read 2;
Watch "Subwoofer Box Volume - Car Audio Basics - CarAudioFabrication" on YouTube
 

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Ok...just read the description of "bass roll off" mentioned by the gentleman above my last post. Like I said, curious mind so i needed to know🤔
I'm thinking my box material density comment is irrelevant?!? LOL
What I found out is that the answer is way above my pay grade, and that it's just one of those things in life that I dont need to know. LOL.
Cheers, Sadz.
 

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Ok...just read the description of "bass roll off" mentioned by the gentleman above my last post. Like I said, curious mind so i needed to know
I'm thinking my box material density comment is irrelevant?!? LOL
What I found out is that the answer is way above my pay grade, and that it's just one of those things in life that I dont need to know. LOL.
Cheers, Sadz.
Me too my man...I just know that when I turn up the bass to get a little more kick, at higher volumes, you can literally hear the stereo go quieter right at a bass thump. Now, if I turn the bass down and volume up, this doesn’t happen. Something about the way the system is configured or programmed. Seen a lot of chatter that it was possible to eliminate that issue without replacing the speakers, using FORScan but nothing 100% on how to actually do it. There are codes to change in certain modules, etc etc. haven’t read a thread with an explanation on what was actually changed, or a thread confirming that it actually makes a difference.

Anyway, I have FORScan and the OBD 2 module. Will tinker with it and post back if anything comes of it, so long as I don’t accidentally cut the red wire and blow sh*t up.




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2013 Ford F150 XLT 3.5 EgoBeast SuperCrew 4X4, 3.55 axles, 9.75" w/elocker
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Front left and right are full range, so you should tap signal for sub there and not the rear speaker wires and the bass rolloff can be addressed using a DSP or an Audiocontrol unit.
 

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One thing I'm surprised I haven't seen anyone try yet on this sub box is to mount a piece of fiberglass to the floor right under the box so the carpet doesn't eat all the sound up. Going to grab a piece of plexiglass from home depot or lowes, drill 2 holes in it for the box to mount through and throw some rubber washers on the top side.
 
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