1Pc 2 Inch Resonance Speaker Vibration Strong Bass Louderspeaker All Frequency Horn Speakers 50mm 4 Ohm 25 WThe horn is all frequency effect, the bass is very strong, the equivalent of traditional loudspeaker 4 inch bass effect, with the other with the size of the traditional speakers, bass is strong, big power. The end of the line with red mark for the positive, connect the audio line, with amplifier is ok. Diameter: 50mm * 30mm Impedance Power: 4ohm 25W 8Ohm 20W Weight: 270g Packaging Including: 1 x Speaker(4 Ohm 25W or 8Ohm 20W)