I'm having 19vdc at my surround speaker outputs, yet the subwoofer output is okay, my speakers even got burnt.

[DT TIMO ELECTRONICS]

I did this thoroughly well but i will observe every connection tomorrow...

I am surmising , because you stated '14vac dual transformer' that you have +19V / 0V / -19V power (after rectification & smoothing).
The ground/chassis symbol that appears several times on the on the schematic - these points are all connected to the 0V of the power supply.