User manual PIONEER GM-X404

[. . . ] Over time your hearing "comfort level" adapts to higher volumes of sound. So what sounds "normal" can actually be loud and harmful to your hearing. Guard against this by setting your equipment at a safe level BEFORE your hearing adapts. to establish a safe level: · Start your volume control at a low setting. [. . . ] ⷠIf you only use one input pin plug, set the input level controls for speaker outputs A and B to the same position. Set the input level control to 500 mV when this amplifier is connected to a Pioneer car stereo with RCA output jacks. [7] Speaker Out A: Bass Boost Frequency Control You can select a bass boost frequency from 40 to 120 Hz with the bass boost control. ⷠ[6] [7] can be adjusted only when the LPF/HPF select switch is set to a position other than HPF . * Set the LPF/HPF select switch to the HPF (right) position if you want to cut the verylow-frequency range because it is not necessary for the speaker you use. * Set the LPF/HPF select switch to the HPF (right) position if you want to cut the verylow-frequency range because it is not necessary for the speaker you use. [6] Speaker Out A: Bass Boost Level Control Bass boost level control can boost the level around the frequency selected by the bass boost frequency control to 0 to 12 dB. To protect the wiring, wrap adhesive tape around them where they lie against metal parts. ⷠDo not route wires where they will get hot, for example where the heater will blow over them. If the insulation heats up, it may become damaged, resulting in a short-circuit through the vehicle body. ⷠMake sure that wires will not interfere with moving parts of the vehicle, such as the gearshift, handbrake or seat sliding mechanism. ⷠNever feed power to other equipment by cutting the insulation of the power supply wire to tap from the wire. Always use the special red battery power and ground wire [RD-222], which is sold separately. Connect the special red battery power cord directly to the car battery and the black ground wire to the car body. (The special red battery power and ground wire [RD-222] are designed so that the amplifier can be connected safely. Do not ground the speaker wire directly or connect a negative (­) wire for several speakers. ⷠSpeakers to be connected to the amplifier should conform with the standards listed below. Speaker Channel Fourchannel Type Sub-woofer Other than sub-woofer Sub-woofer Other than sub-woofer Sub-woofer Other than sub-woofer Sub-woofer Other than sub-woofer Power Nominal input: Min. [. . . ] [35] If only one input pin plug is used, do not connect anything to RCA input jack B. [16] Output [17] White [18] Red [19] Connecting wires with RCA pin plugs (sold separately) [21] RCA output pin jacks [28] Black cover [29] Black stripe [30] Green cover [31] Green stripe [32] To RCA input pin jacks [33] RCA input pin jack A [36] No connection [38] Speaker (right) [39] Speaker (left) Two-channel mode (mono) (Fig. [16] Output [17] White [18] Red [19] Connecting wires with RCA pin plugs (sold separately) [21] RCA output pin jacks [28] Black cover [29] Black stripe [30] Green cover [31] Green stripe [32] To RCA input pin jacks [33] RCA input pin jack A [36] No connection [40] Speaker (mono) Do not install in: -- Places where it could injure the driver or passengers if the vehicle stops suddenly. -- Places where it may interfere with the driver, such as on the floor in front of the driver's seat. [. . . ]