[. . . ] Please observe the following safety notes during the installation and connection. ­ When you drill holes, ensure that you do not damage any vehicle components. ­ If the positive and negative cable are extended, ensure that the cross section is not less than 2. ­ An incorrect installation can result in malfunctions of the electronic vehicle systems or your car sound system. [. . . ] Also check your settings of the GTb 200 A with the bass control fully open and, if necessary, with activated loudness. One of the special features of the GTb 200 A is its automatic switch-on. The subwoofer box automatically switches on if a music signal is received. If there is no music signal for more than 60 seconds, the GTb 200 A automatically switches off. Please use the return and collection systems available to dispose of the product. Anslutning 6 kopplas till plus batteri och anslutning 7 kopplas till minus jord. 8/9 till de högtalarkablar (framtill eller baktill) som ligger närmast till vänster och höger. The amplifier power cable must be fitted with a fuse no more than 30 cm from the battery to protect the vehicle battery in case of a short circuit between power amplifier and battery. The fuse of the amplifier protects only the amplifier, not the vehicle battery. One of the special features of the GTb 200 A is its automatic switch-on. The subwoofer box automatically switches on if a music signal is received. If there is no music signal for more than 60 seconds, the GTb 200 A automatically switches off. The control of the GTb 200 A should ideally be a two-channel control, either via the preamplifier outputs or the loudspeaker outputs of the car sound system. A control solely via the right or left channel is also possible since the low-frequency portion of the music is generally identical on both channels. The preamplifier outputs are connected to the cinch (RCA) sockets of the subwoofer box via a shielded sound cable. with control via the loudspeaker outputs , the input connections of pos. 8/9 are fed to the closest loudspeaker cables (front or rear) on the left and right. Bridge output stages (BTL) can also be connected directly without an additional adapter. TIM function: For car sound systems with activated TIM function, the GTb 200 A must be controlled via the loudspeaker outputs of the car sound system and not via the RCA inputs (see page 29 / Fig. Please read these operating instructions before using the equipment for the first time. [. . . ] The following control setting is recommended as basic setting before putting the device into operation: Sensitivity (gain) Pos. Now slowly increase the gain control 1 until you can hear a clear amplification of the bass level. Next, use the crossover control 3 to select a filter setting that provides a well-contoured bass. you may have to alternately optimise the gain control setting 1 and the filter setting 3. [. . . ]