Abstract: A multirange thin speaker assembly for installation in automobile doors and like constricted space installations in compact automobiles and the like with the front of the assembly facing toward the automobile interior, including a main speaker section having a speaker basket frame provided with mounting ears for receiving front mounting screws to fix the speaker basket frame against an interior wall portion of the automobile door. The main speaker section includes a woofer speaker unit and a bridge member supported from the basket frame carrying a tweeter speaker unit. A front grille panel of unitary plastic material has a pair of transversely spaced arcuate rear snap ring segments forming an interrupted annular ring projecting rearwardly from the panel to interfit in an anchor ring member carried by the basket frame, each having radially outwardly projecting bead formations to snap behind retaining shoulders of the anchor ring to fasten the grille panel to the anchor ring.

Abstract: A response tracer audio equalizer booster amplifier unit having graphic display of frequency response characteristics for variably boosting the power of output signals from an audio frequency signal source to speakers of a stereo sound system or the like, having a cabinet enclosing audio amplifier circuitry for variably boosting the audio signal at plural frequency bands in the audio spectrum, a manually adjustable slide control for each band adjustable along horizontal fore-and-aft paths for varying the signal boosting at the frequency bands, and a graphic display window having markings for the frequency bands and a continuous flexible curve indicator wire variably shaped to simulate a frequency response curve. Motion translating flexible coupling members are moved by the slide to shape the wire to indicate the frequency response curve.