As I see it, the tweaking is like using a equalizer. Any tweaking method will affect certain frequency(increase or decrease it). My experience is that using hardwood like Ebony or Purple Heart are very effective in altering the sound. When using it properly, it adds harmonic to vocal or any kind of acoustic instruments. Making it sounds very natural, full of life and very realistic in the presentation. Other material like the Black Diamond Racing cone, the BDR shelf, carbon fiber board, grainite or marble slab all have their own character.
In general, hardwoods give the system more warm, musical and softer presentation.
Other materials like BDR cone/shelf, carbon fiber board, grainite/marble will give the system a more bright, analytical, sharper(less natural image), dryer presentation.
Usually a well-tuned system will need to a mixture of the above materials in order to make it sounds nice and balance.
It is like cooking, everyone have their own mixture of spices......
In general, hardwoods give the system more warm, musical and softer presentation.
Other materials like BDR cone/shelf, carbon fiber board, grainite/marble will give the system a more bright, analytical, sharper(less natural image), dryer presentation.
Usually a well-tuned system will need to a mixture of the above materials in order to make it sounds nice and balance.
It is like cooking, everyone have their own mixture of spices......