You're looking for a reliable source to access the user manual for the Sony STR-K1600!
The manual mentions "power backup" but not that settings survive only 30 seconds of power loss. To permanently save EQ and level settings, perform MENU → CUSTOM → MEMORY SAVE . Without this, a brownout resets everything. sony str-k1600 user manual
If you have found a digital copy of the , the sheer number of pages can be overwhelming. Here are the critical sections you should bookmark or print out for quick reference. You're looking for a reliable source to access