Yes, you can cut the connector off a speaker cable and use the bare wire to connect to your speakers and amplifier, provided that the terminals on both the speakers and amplifier accept bare wire connections. This approach is common and can be particularly useful when dealing with custom lengths or specific connection needs that pre-made cables don't meet.
When preparing the cable, ensure a clean cut and strip the insulation carefully to expose enough wire for a secure connection without fraying or short circuits. Twisting the strands of the bare wire tightly can improve the connection's reliability. However, always exercise caution to ensure a safe and effective connection, avoiding any risk of electrical shorts or damage to your equipment.