Pro Audio Technoloy SCRS-25im – The SCRS-25im in-wall loudspeaker is Pro Audio Technology’s most affordable speaker and ideal for those looking for a high-performance but attainable home theater speaker solution. Utilizing a ¾-inch high-frequency compression driver that resides in a Pro Audio Technology designed horn and a pair of 5-inch, long-throw paper cone woofers, the SCRS-25im is a high-efficiency speaker rated to produce a frequency response of 80Hz to 18kHz.