Need to know frequency response of Apple Powered Speakers, model number M4475LL/B

I'd like some info about some vintage Apple Powered Speakers. I posted here because there isn't a community for this kind of peripheral. Mac Pro seemed a likely place to find some info on older Apple peripherals. I'm thinking of buying an older set of Apple Powered Speakers M4475LL/B. What I need to know is: does anyone know what the frequency response of these speakers is? I realize they're old but would appreciate this info. Thanks.