P90 + foam suppressor + sock wrapped around battery = silent from more than 10' away.

I'm one hundred percent sold on silencers. I almost refuse to use my g36 without one!

Check it out, been trying to silence my VFC HK416:
"The Silent AEG Quest" Test#1 - YouTube

Ive personally found that with my p90 the majority of my mods to silence it havent made it too quiet..but what they have done is made the noise less sharp and harder to locate

Your ROF is too slow.

Really all you need is a gearbox and gears that don't suck, with a lightweight piston setup (not heavy silent shit), sorbo pad and suppressor. Fast trigger response helps too.

Is it just me or do V2 gearboxes tend to be a lot louder than V3 and V7?

Might be the design of the guns rather than the mechbox

i find that some motors can be really loud while others are almost completely quiet.
TM motors are ok. ICS, VFC, G&P and CA motors seem to be the loudest. the systema motors so far have been the quietest motors i have used, and i use a Systema Magnum in my AEG. my VFC 416 has been tuned heavily, and it's often mistaken for a PTW until someone walks up to have a closer look. i would dare say that it's quieter than a PTW.

uhh, dunno what your ears are hearing, but PTWs aren't anything close to what I'd call "quiet".

PTW's aren't quiet, they just cycle really fast.
Incidentally, has anyone ever heard a PTW with a loudener on it? Meanest sounding thing ever.

Here's my contribution, with and without suppressor.

The suppressor deadens the sound. Video is taken approximately 6-12" away from the gun.

http://youtu.be/jQ-pT_IhpdE

they don't cycle fast, especially not with that absurd gear ratio they use.

p* with a 2L soda bottle loudener...now that was scary.

Did you try doing that test with BBs cycling through Stealth? I find the sound of an AEG blank firing is very different. I do use my silencer too but I personally find them effective but not as effective when you're actually BBs through it. :)

Yup. Unfortunately I'm in a tiny apartment without a good place to shoot at...

Maybe I'll do something over the weekend when I have some more room to maneuver.

The idea is that the BB actually creates back pressure, forming a pseudo air-break for the piston head. Hence it's quieter than blank firing.

Yes, a formula 1 car IS faster than a ferrari.
But most people don't have a formula 1 car, and most people don't have a ferrari either lol