When I turn up the bass loud enough I hear a popping sound? What's wrong?

FabioA

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How do i set up my amp for my component speakers and my 6x9's?
I am hooked up an amp to drive the four aftermarket speakers that I have installed to replace the blown ones that came with the car. When I turn up the bass loud enough I hear a popping sound.

How do I setup the amp for all four speakers with my high and low pass filters, my gains, my subsonic filter, etc...

For each set of speakers I have the same settings channel 1/2 (alpine) and channel 3/4 (infinity)

Here are the specs....

4 CHANNEL 1000W BRIDGEABLE MOSFET AMPLIFIER
- VARIABLE LPF(30 HZ-500HZ)
- VARIABLE HPF(50HZ-1KHZ)
- VARIABLE BASS BOOST (0-18DB)
- VARIABLE BASS FREQUENCY (30HZ-120HZ)
- VARIABLE SUBSONIC FILTER (10HZ-100HZ)
- HIGH & LOW LEVEL INPUT
- 2-OHM CAPABLE STEREO

In my doors I have....

Infinity Reference 6020cs 6½" Component system

- Sensitivity 93dB
- Frequency Response 53 - 21,000Hz
- RMS Power Range 2 - 90 Watts
- Peak Power Handling 270 Watts
- Impedance 2 Ohms

And my rear speakers are...

Alpine SPR-69C

- Sensitivity: 89 dB
- Frequency Response: 60 Hz - 27 kHz
- RMS Power Handling: 100 watts
- Peak Power Handling: 300 watts
- Impedance: 4 ohms
 
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