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You sure the subs are 4 ohm a piece or the box is 4 ohm with 2 8 ohm speakers? Two 4 ohm subs wired together creates a 2 ohm load and your amp should say what ohm ratings it will take. If the box is labeled 4 ohm you should pull the subs and look at their specs to ensure the will provide 4 ohm when ...

First of all the 4000 and 2000 are false dynamic power claims, just pay attention to the RMS ratings of the two amps. When picking a sub amp you should focus on what ohm your sub will be. The lower the ohm resistance on your sub the higher the rms power the amp will produce. The higher the rms drive...

Can you just remove one of the rear speaker channels from the funky rca wiring setup ? You don’t need two channels into a mono sub channel.


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Need more details on how the speaker wires are coming into the amp. Assuming you have the switches set right on the amp, it sounds like the input signal is not sufficient.


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This might help, my money goes on power shortage or a weak fuse.

This article has some good tips on how to make your connections to ensure your voltage readings are an accurate reflection of what the amp is receiving.

Amp in Protection - Troubleshooting


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Do you have your speaker wires coming off the amp like it is shown on page 11 of the owners manual ?
https://www.bossaudio.com/manual/PHANTOM-AB_EN_UM.PDF

Is this how your speaker wires are coming off the amp ?




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Duplicate

Could you post a pic of how the speaker wires are connected to the amp on the output side ?


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This might help.

Amp in Protection - Troubleshooting

It would be good to provide more info such as make and model, input signal, what wires have been replaced / what has been done already.


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