so I want to port my box

[Polar]

another question on the poly fill. Im an a/c guy and have been reading about lining boxes with fiberglass. Is this good? To me it seems it would drastically shrink the internals of the box but have read where people do this in leu of poly fill.

 

[NSTALN 10+ year member]

another question on the poly fill. Im an a/c guy and have been reading about lining boxes with fiberglass. Is this good? To me it seems it would drastically shrink the internals of the box but have read where people do this in leu of poly fill.

I've never used fiberglass for fill...I've always used polyfil batting(mat). The theory is the poly actually slows down the back wave making the enclosure 'seem' bigger, thus lowering the tuning.

 

[Polar]

cool, I have rolls upon rolls of that stuff in my shop as well, that we use for filter media.

 

[NSTALN 10+ year member]

cool, I have rolls upon rolls of that stuff in my shop as well, that we use for filter media.

Rule of thumb for stuffing is 1lb per cf of airspace. So 2-2.5lbs loosely placed in the box should help.

Let us know how it sounds...remember you will NEED a subsonic filter or you risk over-excurting the subs...and that's no bueno!

 

[Polar]

my amp has one on it, will that work?

 

---------- Post added at 02:50 PM ---------- Previous post was at 02:49 PM ----------

 

and how do you set those things? I was farting around with it today and got it at the 35 hz setting

 

[NSTALN 10+ year member]

my amp has one on it, will that work? 

---------- Post added at 02:50 PM ---------- Previous post was at 02:49 PM ----------

 

and how do you set those things? I was farting around with it today and got it at the 35 hz setting

Yes it will work just fine. The tuning frequency of your box is going to be around 33hz-35hz depending on the affects of the polyfil...ssf's are typically set to around 5hz under tuning freq of the enclosure...you can run yours safely down to around 28hz-30hz.

***Shameless plug for my build log***Check out my build log***

http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/617930-audiofrog-gb10-gb25-dash-podz.html

//content.invisioncic.com/y282845/emoticons/naughty.gif.94359f346c0f1259df8038d60b41863e.gif

 

[BrianJennings75]

My dear sweet baby Jesus! I rattled my slider window out! Thanks for the advice! At 1 ohm, gain set, fricken thing bangs! I had to port up, external, didn't have room to do the side port with my box design.

 

[BrianJennings75]

View attachment 26552984

 

[BrianJennings75]

I painted the tube red, it sits about 6 inches off the bottom, poly filled the box and ****!

 

[BrianJennings75]

View attachment 26552985

 

[mazdakid 5,000+ posts]

Bet it's a lot louder now.

Should have fired it out the side at the door.

 

[BrianJennings75]

Had no room, I'm gonna put a 90 on it and fire it at my right ear lol

 

[NSTALN 10+ year member]

Excellent. I'm glad you're happy with the results. Great work!

 

[lew-e 10+ year member]

Had no room, I'm gonna put a 90 on it and fire it at my right ear lol

Maybe put that 90 on it and experiment with orientation. See where it works best for you

 

[Polar]

https://youtu.be/KjUmPDgSVMY