The ornamental design for a receiver, amplifier and speaker unit, as shown and described.
FIG. 1 is a perspective view of a receiver, amplifier and speaker unit showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side of FIG. 2 thereof;
FIG. 5 is a right side of FIG. 2 thereof;
FIG. 6 is a top plan view of FIG. 2; and,
FIG. 7 is a bottom plan view of FIG. 2.
The broken lines shown on the drawings are included for the purpose of illustration only and form no part of the claimed design. The plurality of darkened oval openings included on the front of the device is claimed.