Applications CABIN SPEAKERS FOR P. A. SYSTEMS FOR NEW DESIGN. AURAL WARNING AND COMMUNCATION SPEAKERS FOR COCKPIT OF AIRPLANE . AVIONICS UPGRADE IN THE COCKPIT OF EXISTING AIRPLANES FOR TCAS AND PWS REQUIREMENTS. REPLACEMENT OF SPEAKERS DURING REFURBISHING OF INTERIORS OF EXISTING AIRPLANES. LOWER COST OPTION FOR SPARES ON NUMBER OF AIRPLANES WHERE SPEAKERS ARE ALREADY    APPROVED BY THE OEM'S. CUSTOM DESIGNED SPEAKERS TO MEET CUSTOMER REQUIREMENTS.