headphone output on a 75 watt amplifier

my amplifier is 75 watts and i have no output. i do however have a headphone output and was wondering if anyone, maybe electrician or musician would know if i can splice my headphone wire and attach my home stereo speakers which are 175 watt without blowing them at high volumes.
i need to know because i want my newly aquired drummer to be able to hear me when we jam. i have a 7-string ibanez and a 12 inch peavy.
rock the on!!!!