HogFan

Black FX2 - when you say that you stuff the sub box with polyfill, exactly what are the steps to doing this. Assume you have to open up the box to do this? Have any photos? Thanks !!

ematherne11

This is great Advice! Do you have any pics of the modification? I guess I'm headed to WMart soon for some poly fill!!

Black_FX2

Sorry guys, I didnt take any pics and its pouring rain here right now. Besides, I doubt I could figure out how to post pics
Here are the steps:

1A. Listen to a couple of your favorite songs and try to notice the sound of the sub for later comparison.

1B. There are 4- 8mm bolts that you'll need to remove to take the sub enclosure out. The bolt on top of the box itself is bolted into the back of the sub magnet. Two of the bolts are under the bolt covers in front of the box. These covers are easily removed with just your hands but you can use a flathead to help pop them off in needed.

2. After you get the 4 bolts out, flip the box over and disconnect the plug coming from the carpet going into the factory amp. The edges of the amp are very sharp so be careful not to cut yourself or even worse, scratch your truck!

3. By now you've seen all the #2 phillips screws on the front of the sub. Unscrew all of these and use a flat head screwdriver to pry the sub out if necessary.

4. You will see 4 wires plugged into the sub. You can leave them plugged in if you want but it makes it a lot easier to unplug the sub and get it out of the way. Dont be scared to unplug it because the wires will only reach and plug in where they are supposed to. BEFORE trying to just pull the terminals off, look closely, there are tabs in the center of each terminal that need to be pushed outward to unlock them while you pull. BEND/PUSH these tabs back into place when reinstalling or the terminals will be loose!

5. Now you can should see the inside of your empty sub enclosure and this is where the polyfill material will be added. Take handfulls of the material and pack it into the corners of the enclosure. Once you have the corners filled in with the polyfill, keep adding more until you get to where the sub sits. Leave this space fairly open, you can put some behind the sub as long as its not small pieces but you dont want the enclosure completely crammed full of polyfill. I believe the formula is 1lb of polyfill per 1cu. foot of enclosure but its hard to gauge unless you can buy it in 1lb bags

6. You can now reinstall the sub. Note that there is an arrow on the top of the sub surround and one on the enclosure, these arrows need to allign for proper fitment. If you removed the wires from the sub, the short wires will obviously go to the side that they reach, the other set will go to the farthest side. not that it would make a difference anyway...

7. Take the box back to your truck and plug in the wire harness you unplugged from the amp. Set the box in its place and start the bolts into there holes but dont tighten yet.

8. Listen to the same songs that you did before you started this project keeping the same settings and at the same volume level. If it sounds better to you, snug down those bolts and enjoy, if it doesnt sound better, try pulling some of the polyfill out because you may have added too much. If you still dont like it, pull it all out and youve wasted what $5? I hope that you'll be pleased or I wouldve never posted this in the first place!

RebelKR09

Black_FX2. Thanks for sharing this great tip. I never even thought about messing with my sub, but I did hate how it bottom out. Well, I just got done filling my box with pollyfill and it sounds a lot better. Thanks! If you got any tips to do with the audio setting, please share.

Black_FX2

Im glad that it worked out for you! As far as settings go, mine will be a little different because Ive replaced all the factory sony's with 6 1/2" component systems. Settings are really more of a personal preference and also depends on the type of music you listen to. That said my settings are; Fader front +4, Bass +2, Treble +4 or +5.

Black_FX2

I posted this thread just about 24hrs ago and there have been 676 views so far, thats amazing to me! I know more than one person has or will try this so please post your results.

Execut1ve

for anyone who is curious about the acoustics behind this technique, the polyfill dampens reflections inside the sub enclosure. In designing a speaker enclosure, the resistance of the air inside the enclosure to compression and expansion must be accounted for since the air inside acts like a spring which helps return the speaker cone to its equilibrium position. At the enclosure's resonant frequency, reflections from the back wall of the enclosure can travel back and impact the speaker from behind, causing undesired effects. Adding absorbent material lining the inside of the enclosure reduces reflection off the internal surfaces of the enclosure. Also it changes the thermodynamic properties (the way the vibration of the air inside the enclosure is converted to heat) from adiabatic to isothermal which makes the enclosure behave less like a small enclosure and more like a large one.

Syv

someone post pics I am still unsure how much polyfilll to use

Black_FX2

Out of a 1lb bag, I'd say you'll use maybe 1/4. Can't say for sure because I had used some out the bag prior to this. I'll try to post some pics but this week is gonna be pretty hectic for me with work.

N2deep

Did mine today. Worked great and sounds better thanks for the great tip. I used some stuffing out of one of my couch pillows. Lol. Wonder how long it will be before my girl friend finds out and chews my butt.