RDL TX-70A speaker level input interface matches a 100, 70 or 25 volt speaker line to any unbalanced line-level audio input. Line output is unbalanced. The trimmer adjusts output level for various input voltage/power levels. Frequency response: 20 Hz to 20 kHz (+/- 0.5 dB). THD: < 0.05% (1 kHz).
Radio Design Labs/RDL is a manufacturer of electronic audio, video and control products headquartered in Prescott, AZ. Their products are used in commercial and residential audio and video installations and in broadcast and recording facilities. The company is known as the pioneer of application-specific electronic modules including STICK-ON, RACK-UP and FLAT-PAK.