Alpine CDE-HD137BT Owners Manual (english) - Page 20

Turning Subwoofer ON/OFF When the subwoofer is on, you can adjust the subwoofer output level (refer to "Adjusting Subwoofer Level/Bass Level/Middle Level/Treble Level/Balance (Between Left and Right)/Fader (Between Front and Rear)/Loudness/Defeat" on page 16).  Setting item: SUBWOOFER Setting contents: SUBW OFF / SUBW ON (Initial setting) SUBW OFF: No subwoofer signal is output from the Subwoofer RCA Connectors (refer to "Connections" on page 50). SUBW ON: The subwoofer signal is output from the Subwoofer RCA Connectors (refer to "Connections" on page 50). Adjusting the Low Pass Filter The Low Pass Filter on this unit can be adjusted to suit your personal taste.  Setting item: SUBW LPF Setting contents: LPF OFF (Initial setting) / LPF 60 (Hz) / LPF 80 (Hz) / LPF 120 (Hz) / LPF 160 (Hz) All frequencies lower than the selected cutoff are output. Setting the Subwoofer Phase The subwoofer output phase is toggled between SUBWOOFER NORMAL (0°) and SUBWOOFER REVERSE (180°). Depending on the installation location of your subwoofer, one of these settings may sound better than the other.  Setting item: SUBW PHASE Setting contents: NORMAL (Initial setting) / REVERSE Setting the Subwoofer System When the subwoofer is on, you can select either SYS 1 or SYS 2 for the desired subwoofer effect.  Setting item: SUBW SYS Setting contents: SUBW SYS 1 / SUBW SYS 2 (Initial setting) SUBW SYS 1: Subwoofer level changes according to the main volume setting. SUBW SYS 2: Subwoofer level change is different from the main volume setting. For example, even at low volume settings, the subwoofer is still audible. External Device Connecting to an External Amplifier (POWER IC) When the internal amplifier is not being used, sound quality can be improved by turning off its power supply.  Setting item: POWER IC Setting contents: OFF / ON (Initial setting) OFF: Use this mode when the line output of this unit is used to drive an external amplifier. In this setting, the head unit's internal amplifier is turned OFF and cannot drive speakers. ON: The speakers are driven by the built-in amplifier. OFF: Amplifier Amplifier Front Left Front Right Rear Left Rear Right ON: SPEAKER RIGHT FRONT Speakers Front Right SPEAKER RIGHT REAR SPEAKER LEFT REAR Rear Right Rear Left SPEAKER LEFT FRONT Front Left Note • No sound is produced by the system when the power output is set to OFF. 20-EN