Should i add polyfill?

[jboy24]

i got my RL-P about a week ago and i put it in a 1cu ft box after displacement and it makes a pop instead of a boom at loud volumes..

after researching the topic it seems like the box may be too small therefore causing over-excursion..

if i add polyfill will this fix the problem, i have read that it makes the box seem bigger to the sub, no idea if this will work.

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[king ranch 5,000+ posts]

i never heard of box being too small causing over excursion

 

[sqhertz 5,000+ posts]

you can try.

go to a fabric store and get some polyfill instead of ordering it. its cheaper and no wait for shipping. it should say something like 'poly fiber fill' and be flame resistant. 1lb = 1cuft , more or less.

 

[Immacomputer 10+ year member]

i got my RL-P about a week ago and i put it in a 1cu ft box after displacement and it makes a pop instead of a boom at loud volumes..
after researching the topic it seems like the box may be too small therefore causing over-excursion..

if i add polyfill will this fix the problem, i have read that it makes the box seem bigger to the sub, no idea if this will work.

No, you're driving it too hard, which is causing over excursion. The bigger the box, the less spring force applied to the sub and the easier it is to make it bottom out. Adding polyfil will NOT change this spring force and will NOT make the sub stop bottoming out. You either need to cut back on the power, make the box smaller, or port it.

 

[chunky cumz 10+ year member]

well then what are the true effects of the polyfill tho? does it really work or is it an audio illusion?

 

[Rashaddd 5,000+ posts]

well then what are the true effects of the polyfill tho? does it really work or is it an audio illusion?

testing shows it really does work, it'll increase the effective box size 10-20%

 

[kovemaster559 5,000+ posts]

polyfill FTMFW

 

[chunky cumz 10+ year member]

testing shows it really does work, it'll increase the effective box size 10-20%

even if its ported?

if so why dont everyone use it? sounds like an inexpensive way for more BOOM

 

[Rashaddd 5,000+ posts]

even if its ported?if so why dont everyone use it? sounds like an inexpensive way for more BOOM

im not sure about ported, it changes tuning and stuff too though for ported so idk if people would all want to do it anyway, I think its been answered before, try searching

 

[Immacomputer 10+ year member]

well then what are the true effects of the polyfill tho? does it really work or is it an audio illusion?

It adds damping to the system which will lower the alignment. This means that peaks and nulls get flattened and low end extension is increased. These two things happen when you build a bigger box but there are other things that going with a larger enclosure changes that polyfil doesn't. One of those things is excursion. Polyfil will not change the excursion of the driver (unless stuffed beyond what is beneficial) but enclosure volume will.

With ported enclosures, you're not going to get the same effects like you would building a larger enclosure. You WILL lose output if you stuff a ported box with polyfil and it will dampen the response around tuning making the ported box more like a sealed box (the more you stuff, the more this happens).

 

[alex5857 10+ year member]

ha i've got the exact same problem with the exact same woofer..i thought it was rated at 1000 watts rms? im not even giving it 500, i have my 1501d wired to 8ohms and it still causes it to pop

 

[Immacomputer 10+ year member]

ha i've got the exact same problem with the exact same woofer..i thought it was rated at 1000 watts rms? im not even giving it 500, i have my 1501d wired to 8ohms and it still causes it to pop

Well, when you put an over-motored driver with relatively soft suspension in an overly large sealed enclosure, you reduce your power handling. A 1 cube sealed box for the RLP gives an alignment of about .45 which is pretty overdamped.

That sub looks like it should really be in a smaller ported box. For better cone control and power handling, an ABC or 6th order bandpass would be a better option.

 

[tez4life Premium Member]

Never had a "popping" issue with mine, and I was feeding it 800 to 900w daily. Ported, tuned low, and sometimes playing stuff below the tuning frequency.

OP, what size RL-p and box?

 

[alex5857 10+ year member]

Well, when you put an over-motored driver with relatively soft suspension in an overly large sealed enclosure, you reduce your power handling. A 1 cube sealed box for the RLP gives an alignment of about .45 which is pretty overdamped.
That sub looks like it should really be in a smaller ported box. For better cone control and power handling, an ABC or 6th order bandpass would be a better option.

Well Soundsplinter recommends .9 to 2 cubic feet sealed and im almost at the minimum of the recommended size, and i wanted sealed for SQ..

it might be the driver since my basket broke on the way here, dragnix is sending me the newer one so i was worried that it might not be able to handle the power.