SD-6S-ALU High Definition In-Ceiling 6.5" Aluminum Cone Speaker (Pair)SD 6S ALU High Definition In Ceiling Speakers comes with 6. 5 durable aluminum speaker cone and special circuit designed by Soundavo engineering team, to provides the superior tonal characteristics, good moving air with transparency sound, dynamic and big. It's a very tuneful "comfortable Listening" speaker and great cohesive spatiality, it gives you a nice string resonances, detail midranges and also handle a large amount of bass with vibrations to