ISO BOX FOR GUITAR AMP

[Marko1976]

Hi,

I intend to build ISO BOX FOR GUITAR AMP.

I am playing Gibson Les Paul, my amp is Blackstar JJN 20, 20-Watt Valve Combo.

I want to turn on the volume on the amp, so that the sound starts to build...

My question is, how big decrease in volume can I expect with iso box? I want to reduce the outside volume as much as I can...

Any ideas which is the best way to build it?

Thank you in advance, Marko

[gullfo]

a box-within-a-box - 20mm plywood with a 100mm gap between boxes - fill with sand. the lid will need venting or better keep the amp outside the box and only the speakers inside. if venting - build it like you would a room-to-room duct silencer and construct the lid like the box with the shell-sand approach to mass and damping. you should be able to get extremely loud inside the box with little exterior sound or vibration.

[DanDan]

As Glenn said if you build it with decent mass and sealed, very little sound will get out.
But note that a part of the sound of electric guitar is often the acoustic feedback from speaker to string.
I recorded an album here with the BlackStar 1 Watt amp!. I would love to hear the 5W one.