Bass Trap question

[Supercreep]

> I understood that 8lb behaves less well in the LF because of grazing - sound hitting at an angle. <

No, you have it backwards. But in practice, higher densities are fine for first reflections too. I tested this recently at the first reflection points in my living room system, and you can see that 705 does a fine job in the before / after graph below.

--Ethan

Thank you, Ethan.

-Casey

 

[bpape]

As Ethan said, grazing is only an issue at high frequencies and at shallow angles of attack. For most applications, 6lb would be fine for reflections - I just can't see spending the money when 3lb is half the price and works just as well in that usage.

If you had speakers really close to the wall and the seating pretty far back where the angle that the waves are hitting it are pretty shallow, then it would be an issue. Think of a skipping a rock on water.