Alpine 9965 Owners Manual - Page 25

About the Crossover Crossover: This unit is equipped with an active crossover. The crossover limits the frequencies delivered to the outputs. Each channel is controlled independently. Thus, each speaker pair can be driven by the frequencies for which they have been optimally designed. The crossover adjusts the HPF (high pass filter) or LPF (low pass filter) of each band, and also the slope (how fast the filter rolls off the highs or lows). Adjustments should be made according to the reproduction characteristics of the speakers. Depending on the speakers, a passive network may not be necessary. If you are unsure about this point, please consult your authorized Alpine dealer. 2 way mode Cut-off frequency (1/3 octave steps) Slope HPF LPF HPF LPF Level Low range speaker ---- 20 Hz 200 Hz ---- FLAT, 6, 12, 18, 24 dB/oct 0 to −12 dB Rear high range speaker 20 Hz 200 Hz FLAT, 6, ---- 12, 18, ---- 24 dB/oct 0 to −12 dB Front high range speaker 20 Hz 200 Hz FLAT, 6, ---- 12, 18, ---- 24 dB/oct 0 to −12 dB Low range High range Low range Mid range High range (Different from actual display) Level adjusting (0 to - 12 dB) Output frequency range Slope FLAT Slope adjusting 20 Hz HPF cut-off frequency (Different from actual display) LPF cut-off frequency • HPF (high pass filter): Cuts the lower frequencies and allows the higher frequencies to pass. • LPF (low pass filter): Cuts the higher frequencies and allows the lower frequencies to pass. • Slope: The level change (in dB) for a frequency change of one octave. • The higher the slope value, the steeper the slope becomes. • Adjust the slope to FLAT to bypass the HP or LP filters. • Do not use a tweeter without the HPF on or set to a low frequency, as it may cause damage to the speaker due to the low frequency content. • You cannot adjust the crossover frequency higher than the HPF or lower than the LPF. • Use the recommended crossover frequencies of the speakers being used for setting the crossover. Adjusting to a frequency outside that recommended range might cause damage to the speakers. For the recommended crossover frequencies of Alpine speakers, refer to the respective Owner's Manual. Alpine is not responsible for damage or malfunction of speakers caused by improper crossover settings. 3 way mode (Different from actual display) Cut-off frequency (1/3 octave steps) Slope HPF LPF HPF LPF Level Low range speaker ---- 20 Hz 200 Hz ---- FLAT, 6, 12, 18, 24 dB/oct 0 to − 12 dB Mid range 20 Hz speaker 200 Hz 1 kHz 20 kHz FLAT, 6, FLAT, 6, 12, 18, 12, 18, 24 dB/oct 24 dB/oct 0 to −12 dB High range 1 kHz speaker 20 kHz ---- FLAT*1 6, 12, 18, ---- 0 to −12 dB 24 dB/oct *1 Only when selecting USER'S in "Setting the Response Slope for the High Range Speaker" (page 37). 23-EN