Infinity Reference REF407F 4" Coaxial Speakers and each E2N model uses

and each E2N model uses a DC offset music sensing system to activate the ATO (Auto Turn On)

Owner's manual (English/ French/ Spanish/ Portuguese/ Italian/ German/ twelve others)

Additional Details HEATSINK SIZE: Length 16

51" (64 mm)

Custom Tooled Rubber Gasket and Magnet Boot

Infinity Reference REF407F 4" Coaxial Speakers and each E2N model usesA modern classic Just as they were throughout my 16 years as a Crutchfield Advisor, Infinity's Reference Series speakers remain a popular choice for upgrading from factory speakers. The REF407F 4" 2 way car speakers follow that Infinity heritage by offering the killer combo of high efficiency and superb sound. These Infinity speakers offer larger magnets than most factory speakers for bigger, better sound. Infinity's famous ingredients Reference