Yes, you can connect a soundbar to a 3.5mm jack. The soundbar usually comes with an AUX input that allows you to connect it to external devices using a 3.5mm audio cable. This gives you the flexibility to connect your soundbar to various devices such as TVs, smartphones, tablets, or laptops. Simply plug one end of the 3.5mm audio cable into the AUX output on your soundbar and the other end into the headphone jack of your device. This connection enables you to enjoy high-quality audio from your soundbar.