The more important question is: What impedance can my little Quicksilver amp (designed for headphones) deal with before it implodes?
If your Quicksilver amp is designed for 25 ohm to 600 ohm headphones. it may overheat, and self destruct connected to 8 ohm speakers! 4 ohms I would expect flames...
You should look into what others had done, if anyone HAS used it for speakers....
I may be wrong, and it makes a fine amp at 8 ohms.. but you need to know before you use it that way.