高手請進 汽車擴大機的問題

這是一組超低音的放大器，首先電源要用上粗線連接，保證有足夠動力。
接專用的超低音喇叭 1 - 4Ω 和配合的音箱，調整重放頻率範圍 20-250 Hz，0-180° 相位調校，低通調校 50-150 Hz 等等。

要它有好的聲音，都要通過調校，與你的主左、右音箱音量配合，頻率切換點要接上，喇叭擺位後，調相位，以上等等都要配合，
調得不當、效果會有點怪，你可試調各項，也許會有意想不到的效果。

先看規格：

Product Features

Anarchy Series Class D Monoblock Car Amplifier
RMS Power Rating:
4 ohms: 1800 watts x 1 chan.
2 ohms: 2500 watts x 1 chan.
1 ohms: 3500 watts x 1 chan.
Max power output:
1 ohms: 5000 watts x 1 chan.
Pulse width modulated MOSFET power supply
Convenient remote subwoofer control
LED power (green) and protect (red) indicators
Variable Bass Boost 0 to +18 dB
Chrome-plated connections enhance durability
Variable low pass crossovers
Illuminated logo
3-Way System Protection circuitry (thermal, overload, and speaker short protection)
Dual speaker terminals simplify the hookup of multiple speakers
Heavy duty aluminum alloy heatsink for extreme heat dissipation
Low level high inputs
Heavy-duty set-screw terminals
Input sensitivity:
Low level: 100mV-2V
High level: 2V-8V
Variable low-pass filter (50-150 Hz, 24 dB/octave)
Damping factor: >200
Subsonic filter: 15-40 Hz
Phase Shift: Switchable 0-180°
Signal-to-Noise Ratio: 105 dB
Frequency response: 20-250 Hz
Strapping capabilities allow user to strap two amps together for twice the power using included DataLink cable (2 ohm only)
Dimensions: 18"L x 10"W x 2-3/16"H
1-year Manufacturer's warranty

原本正常嗎~請簡查前端訊號~還有阻亢批配

壞機不是可以更換嗎? 為何要維修?