[. . . ] In order to get the most in performance and life out of this product, we recommend that you thoroughly read this Owner's Manual before using it. [. . . ] Never use benzene, thinner or other volatile liquids for cleaning, as these chemicals may cause damage or discoloration to the finish. When choosing a power amplifier to use with your speakers, make sure that its power output matches the speakers' power capacity (refer to the Specifications below). Even if the amplifier's power output is lower than the speakers' power capacity, the speakers may be damaged when clipping of a high input signal occurs. Continuous high sound pressure level produced by electronic instruments. Popping noises caused by turning on equipment, or by connecting or disconnecting system-components while the amplifier is turned on. * Design and specifications may change without notice due to improvements. Check the specifications (power output/impedance) of the head amplifier/power amplifier you are going to connect to the speaker system and use it under the conditions that meet the requirements of the speaker system. Also, if you are planning to connect two or more speaker systems together, determine the system's total impedance* and use a head amplifier/power amplifier that is within the system's requirements. [. . . ] Use the TWEETER LEVEL control knob on the unit's rear panel to adjust the output level of the tweeter. [. . . ]