Size: 4.3" x 4.3"Power Rating: 30W RMSFrequency Response: 2-15kHzSensitivity: 105dbImpedance: 8 ohmsDiaphragm: PhenolicHorn: ABS w/glass-filled polycarbonateThe PHT-410 also replaces the Foster 025H27 Horn & Driver H025N27A0000 and the SWR, Eden, Carvin, Peavey and SVT versions in bass guitar cabinets. The PHT-410 is a high output high frequency integrated horn and driver. The driver is operating in a true compression mode. The horn is a small format square design that allows the PHT-410 to be used in very small enclosure designs. The PHT-410 is an excellent choice for two way de- signs where the low frequency transducer is an 8 inch or 10 inch loud- speaker. The PHT-410 features a sensitivity rating of 105dB with a one watt input, measured at one meter. This high sensitivity make the in- tegrated horn/driver a very good device when used in applications where high acoustic output is specified but the overall loudspeaker system must be very small. Applications include retail spaces, pub back- ground systems and restaurant designs.The physical mouth of the horn is a 4.3 inch (110mm) square design but the acoustic geometry is circular. This allows the PHT-410 to radiate a symmetrical pattern in both its horizontal and vertical axis.The PHT-410 is constructed from a very rugged glass reinforced ABS resin that offers both a high degree of structural support but also excellent mechanical damping for the device.More information here.