Alpine HDA-V90 Owners Manual - Page 11

ob tune Input Gain Adjustment Control Crossover Mode Selector Switch (HDA-V90 Set the HDA-M80/HDA-F60/HDA-V90 input gain only) to the minimum position. Using a dynamic CD as a source, increase the head unit volume until the output distorts. Then, reduce the volume 1 step (or until the output is no longer distorted). Now, increase the amplifier gain until the sound from the speakers becomes distorted. Reduce the gain slightly so the sound is no longer distorted to achieve the optimum gain setting. a) Set to the "OFF" position when the amplifier will be used for driving full range speakers or when using an external electronic crossover. The full frequency bandwidth will be output to the speakers with no EN high or low frequency attenuation. Crossover Mode Selector Switch (HDA-F60 b) Set to the "ON" position when the only) a) Set to the "OFF" position when the amplifier will be used for driving full range speakers or when using an external electronic crossover. The full frequency bandwidth will be output to the speakers with no amplifier is used to drive a tweeter/ midrange system. The frequencies DE below the crossover point will be attenuated at 12 dB/octave. NOTE: • In this case the maximum Bass EQ FR boost level is reduced. high or low frequency attenuation. b) Set to the "HP" position when the Input Channel Selector Switch (SUBWOOFER) (HDA-V90 only) ES amplifier is used to drive a tweeter/ midrange system. The frequencies a) When this switch is placed in the below the crossover point will be "1+2+3+4" position, all the signals attenuated at 12 dB/octave. are mixed and come out from the IT NOTE: • In this case the maximum Bass EQ boost level is reduced. subwoofer. This setting provides signal to the subwoofer channel when only 4 channel input is available. SE c) Set to the "LP" position when the amplifier is used to drive a subwoofer. The frequencies above the crossover point will be attenuated at 12 dB/octave. b) Setting this switch to "SUB" will send the signal at the inputs of SUB to subwoofer of the HDA-V90. RU Crossover Frequency Adjustment Knob (HDA-F60/HDA-V90 only) CS Use this control to adjust the crossover frequency between 50 and 400 Hz. Input Channel Selector Switch (CHANNEL-3/4) (HDA-F60/HDA-V90 only) a) This switch setting is for selecting either 2-channel or 4-channel input mode. When set to "1/2", signal will be copied from CH-1/2 and sent to CH-3/4, eliminating the need for Y-adapters. b) Setting this switch to "3/4" will keep both inputs, CH-1/2 and CH-3/4 independent. A 4-channel source is required for this mode. 9-EN ALPINE HDA-M80/HDA-F60/HDA-V90 68-44781Z25-A (EN/DE/FR/ES/IT/SE/RU/CS)