it is relatively easy to machine and is inexpensive. However, aluminum is poorly damped and subject to resonance. So it was imperative that other materials are used such as steel,lead,bronze and many others to numerous.I am guessing also the availability and easy to work with then say acrylics...I am sure their are more reasons to using it as a chosen metal.
Why Use Aluminum for a TT Platter?
Mass I am told is a good thing when it comes to TT platters. Lloyd Walker for one extolls it's virtues and as a rule some of the better turntables like to brag about their big ..Platters. Why then would aluminum, known for it's light weight (low density) turn up as frequently as it does as a platter material. I know it is easily machined but isn't there anything better and much denser.