How about I remove the two coupling capacitors from the front output and connect them to the input?

Posted by haklesup
https://www.aliexpress.com/item/Class-A ... tuning-by-dissertationwriter-poweramplifiers/82970.html
Are you talking about those two big orange caps 3.3uF, 100V. Are you sure the are in series and used for decoupling. A schematic of the board and a block diagram of the preamp- to amplifier configuration you are describing would be helpful.
In any case, used in series, the decoupling cap is actually a high pass filter as in it cuts off low like DC and allows AC of a certain range to pass through relatively unimpeded. When you start to put multiple caps and resistors into a network, you may be building a filter with different response than you might really want. Since you are trying to configure a preamp to adjust your sound quality, this could become relevant. If the Cap value becomes too large, it will filter lows excessively, if too low, it may cut off the highs, if combined in a series parallel arrangement with other components and the inductance of a speaker, you may have a complex filter. So a block diagram would clear that up.
in any case, these modules often work out of the box but there is no guarantee that you will be impedance matched to actually get the Hi-Fi you want. The value of decoupling depends on if you are making a wide band or subwoofer. for the most part, you can emulate values you see in other example audio circuits you may find in image searches.
Anyway, you say they are not working, in what way are they not working? how did you confirm this, are you just attaching power and loads or are you using instrumentation (DMM, Oscilloscope, etc.)
searching around, it looked like there were some youtube tutorials on audio decoupling caps that seemed more intuitive than what I was seeing in text.
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