Heavy arrows. I like Carbon Express Terminator Hunter Selects. Very quiet with a TON of Kinetic Energy.

An STS will quiet things down.

And a Sims S Coil Stabilizer, Sims string leeches, and Sims Limbsavers (or Alpha Shox if you have split limbs).

Also, make sure your strings and cables are in waxed and in good shape. Make sure your bow is well tuned too.

And make sure all your accessories are tight with no vibration.

Also, mole skin on an the prongs of an arrow rest makes drawing dead silent.