Sony SA-WM40 Subwoofer (Polyfil Modification)

MartinV

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I'm considering the purchase of 2 Sony SA-WM40
subwoofers for my home theater. I've been reading a
lot about the modifications that are recommended for
the SAWM40. The one that seems like a good first step
is filling up the cabinet with Poly-fil.
For those that have done this modification, please answer the following:
1) Should I purchase Poly-fil brand or does it matter?
2) Is there a specific kind I need (i.e. loose pieces,
solid layers, etc.)
3) I went to the following website:
http://www.poly-fil.com/consumer/cpr...emid=fiberfill
Out of the ones listed here, which should I go with?
4) Is there a better website (product page) that has
the best one to use?
5) Should the inside walls of the sub be sprayed with adhesive before stuffing?
6) Outside of the polyfill mod, should I replace the
woofer with a better one (If so, is there a certain one that is best for this sub)?
As you can tell by my level of questioning, I really
want to make sure I get it right the first time.
Thanks in advance.
Feel free to email your response to me directly...
[email protected]
 

Fong

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well i just stapled the polyfil in there. i dont think the brand matters, but i did get Poly-fil brand. about the woofer, i dont know. i've heard about people using an svs driver with good results, but that costs money
 

MartinV

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Is polyfil anti-flammable? Can the sub generate enough heat for it to catch on fire?
 

Fong

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hehe i dont think its flammable. mine is has been on for around 6 months (auto shut off is disabled), and i use my system nearly everyday for HT or music, and when i first got it i was doing all sorts of bass tests ^_^. if it is flammable, then i dont think it gets too hot.
 

Kevin C Brown

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I would recommend taking your money from the 2 Sony's and the mods, and just get a (better) single sub.

Well known that integrating 2 subs into a HT is much harder than 1 due to standing wave effects. (Basically 2 point sources for low frequencies that can constructively and deconstructively interact at unpredicatble points in your room, unless you take a lot of time mapping out freq response, phase, location, placement, etc.)
 

EricHaas

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Yep, for the price of 2 SA-WM40's you can almost get 1 Hsu VTF-2. The 2 Sony's might give you a little more headroom (if properly positioned), but the VTF-2 will go lower and has a much cleaner, less boomy sound. If your sub budget is at or under $200 though, getting one Sony is a good option. I did the polyfil mod on mine as well BTW. Just shoved 20 ounces in there. The improvement was modest but noticeable. Worth the $7 I spent on the fill.
 

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