Phase shift

[bilboaudio]

Does turning on a HPF produce a phase shift?

On my pioneer gm-d1004 which powers my door speakers when I turn the HPF on I lose lots of bass from the sub until I switch its phase to 180.

The sub is a Kenwood underseat, high level input (input signal straight from the head unit before the gm-d1004)

If I turn the hpf off I again lose bass on the sub until turned back to its original phase setting.

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[wew lad 5,000+ posts]

Does turning on a HPF produce a phase shift?

On my pioneer gm-d1004 which powers my door speakers when I turn the HPF on I lose lots of bass from the sub until I switch its phase to 180.

The sub is a Kenwood underseat, high level input (input signal straight from the head unit before the gm-d1004)

If I turn the hpf off I again lose bass on the sub until turned back to its original phase setting.

It can, it depends on the series of filter the amp is using.