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The best connection from a PC to an amp would be through a digital audio interface or a sound card that has either XLR, RCA, or 1/4″ TRS outputs. These outputs connect directly to the line-in input of the amp. If these outputs are not available on the PC or the sound card, then an alternative option is to use a 3.5mm stereo jack to dual RCA or dual 1/4″ TRS cables to connect the PC’s headphone jack to the amp’s line-in input. The quality of the sound may be affected when using the headphone jack. It is essential to ensure that the levels are set correctly to prevent damage to the amp and the speakers.