GOM will work...for me it looked too much like burlap. Others have used Celtic cloth.....myself, I used stretch velvet and I'm much happier with the way it looks.
As for the insulation, most people use 2" of Linacoustic. I'm assuming when you refer to insulation you mean Linacoustic and not the standard pink "fluffy" stuff (very technical description).
I treated my front wall with Linacoustic and it made an incredible difference....going from 1" to 2" seemed to not deliver much bang for the buck but that is just my untrained ear. Seems like 1" is good...2" is better....but at least 1" is highly recommend based on my experience.
As for the insulation, most people use 2" of Linacoustic. I'm assuming when you refer to insulation you mean Linacoustic and not the standard pink "fluffy" stuff (very technical description).
I treated my front wall with Linacoustic and it made an incredible difference....going from 1" to 2" seemed to not deliver much bang for the buck but that is just my untrained ear. Seems like 1" is good...2" is better....but at least 1" is highly recommend based on my experience.