The ornamental design for an acousticpanel, as shown and described.
FIG. 1 is a top view of the acoustic panel.
FIG. 2 is a bottom view of the acoustic panel.
FIG. 3 is a left view of the acoustic panel.
FIG. 4 is a right view of the acoustic panel.
FIG. 5 is a front view of the acoustic panel. The broken lines form no part of the claimed design.
FIG. 6 is a rear view of the acoustic panel; and,
FIG. 7 is a perspective view showing the front and left side of the acoustic panel. The broken lines form no part of the claimed design.
The broken lines illustrate a base or stand attached to the claimed acoustic panel and form no part of the claimed design.
The claimed acoustic panel is a free-standing, concave surface designed to optimize the reflection of sound waves from an acoustic musical instrument to the player's own ears.