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stereo to mono problem

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Hello, i am trying to convert stereo into mono on my bluetooth amplifier/receiver, since i am using a woofer + tweeter setup. I included a picture of how i solder the pins together. Right now the pot is up to a maximum, which means the pins are effectively shorted together. I know ur supposed to use a resistor but i am looking for a max SPL, even if the amplifier dies after a few months. The amplifier chip itself is TPA3116D2. The amplifier board is ZK-502C hifi.

Problem 1: Even when the pins are shorted together, i get on average about 4-5dB less SPL than i would otherwise and i dont understand why since i am not using any resistors and pot doesnt offer any resistance.

Problem 2: When pins are shorted together, the speaker amplifier will shut down and restart if the pot is over 80% volume. This happens even if the speakers are not connected ! I am really wondering why.

Question: Is there any way to get around this since i need every single last dB i can get, so i cant lose even 1dB, let alone 3dB.
 

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  • TPA3116D2-50W50W-Speaker-Audio-Amplifier-with-Filter-HIFI-Level-20-Stereo-bluetooth-Digital-P...jpeg
    TPA3116D2-50W50W-Speaker-Audio-Amplifier-with-Filter-HIFI-Level-20-Stereo-bluetooth-Digital-P...jpeg
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  • ZK-502C-HIFI-Wireless-Bluetooth-5-0-TPA3116-Digital-Power-Audio-Amplifier-board-TPA3116D2-50WX...jpg
    ZK-502C-HIFI-Wireless-Bluetooth-5-0-TPA3116-Digital-Power-Audio-Amplifier-board-TPA3116D2-50WX...jpg
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1) Auto is an automobile? Or is auto for something that is automatic?
2) 2800Hz frequency cut if bass or a cut of treble frequencies?
3) What is the crossover frequency between the woofer and the tweeter?
 
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