Low frequencies are too high

[BarbaMento]

Hi everyone.
I have an Aiwa 8300 amplyfier, and 2 jensen speacker (i don't know their name because i inherited them from my father, but they are almost 20 years old).
I have been using them for almost 3 years and i've never had any problem untill yesterday.
i decided to clean all my gaming position, so i unplugged everything, and plugged it back.
But that's when the problems begin because now the sounds has low frequencies way too high even if the control knob is set on 0.
What could that be?how could i fix it, or how should i call to fix it?
just to be clear I took away the dust using just a rag.

 

[kanewolf]

First guess, is that you plugged into the phono inputs rather than the aux or tuner.

 

[jsmithepa]

When I do something like that, I always take a picture before undoing anything, is quick, sometimes you just have no idea how it was before!

 

[BarbaMento]

all things were plugged correctly.
Somehow the sound is getting more clear as the time passes. i'm still trying to understand why that happened tho

 

[jsmithepa]

Somehow the sound is getting more clear as the time passes.

Must be a tube amp, takes time to "warm up."

 

[BarbaMento]

Somehow the sound is getting more clear as the time passes.

Must be a tube amp, takes time to "warm up."

how much do you think it will take?