James u mentioned that the egg cartons dont soundproof, If i was to lets say put a layer of thin styrofoam/sponge over the walls then egg cartons and then another layer of some thick cloth, would that help? Sorry if im going off topic, quite interested in this
It'll probably only help with the acoustics of the room... Don't quote me on this, I need to go read up more to back this up, but from what I know, egg cartons (even with sponge or styrofoam) underneath it, will only act to dissipate the soundwaves within the room, so you don't get a very harsh sound (ie. how your drumset will sound like if you're playing in a small room with bare concrete walls). The concept is the same as playing in your room vs playing in your room, but with more people in it.
Soundproofing is not about dissipating the soundwaves, its about reduction and absorption. You could (in theory) have multiple layers of dense, yet soft material to absorb the soundwaves, but because not all materials can absorb the different frequencies of sound, you'll either need to spend a lot of money on multiple layers of different materials (that don't come cheap if I may add), or have really thick layers that'll make your room very small. That's damping of sound.
For professional soundproofing, its the room within a room method, where a smaller room is created within your room, and the space in between padded with acoustic foam or sound absorbant material. But then again, this method is very expensive because you're building a room from scratch, and the room has to be built so that it doesn't have anything that touches the outer room, preventing any transmission of sound. Sound is effectively isolated within that room alone.
I was reading an article on acoustic foam that says that acoustic foam works by dissipating sound energy as HEAT energy, as it increases air resistence, which results in a reduction of the amplitude of the soundwaves. Anybody well versed in sound engineering can confirm this? Physics majors too haha... an alternative source of energy perhaps? Heat energy from acoustic foam used to heat up water, and the steam used to drive turbines to generate electricity.
Oh anyway, don't think about renting a space to jam unless you're serious about going far with your band, or you have a few people who're generous enough to help you with it. Rental doesn't come cheap in land-scarce Singapore...
