Adding a powered sub with no open outputs

[Negative Ghostrider]

Hi all. I'm restoring a 73 Datsun bulletside truck. It came with an am radio and one 4" kick panel speaker. That's obviously not going to cut it. I have a 2 channel amplifier and a pair of coaxes for the kick panels. I am leaving the stock radio in for period correctness (and theft deterrence) and I will just connect the amp to my phone with an rca to 3.5 adapter or a Bluetooth interface. I know I will want to add some low end but there is absolutely no room behind the seats for anything besides a super slim under seat powered sub (less than 4" depth). My question is what would be the best way to get signal if I add the sub? RCA splitter from the phone cable or take a high level feed off the amplifier speaker outputs? Thanks.

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[1aespinoza 10+ year member]

Hi all. I'm restoring a 73 Datsun bulletside truck. It came with an am radio and one 4" kick panel speaker. That's obviously not going to cut it. I have a 2 channel amplifier and a pair of coaxes for the kick panels. I am leaving the stock radio in for period correctness (and theft deterrence) and I will just connect the amp to my phone with an rca to 3.5 adapter or a Bluetooth interface. I know I will want to add some low end but there is absolutely no room behind the seats for anything besides a super slim under seat powered sub (less than 4" depth). My question is what would be the best way to get signal if I add the sub? RCA splitter from the phone cable or take a high level feed off the amplifier speaker outputs? Thanks.

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These will do the trick.