Mono Car Amp If I Have A Mono Car Amp Do I Need 2?

If I have a mono car amp do I need 2? - mono car amp

I was told that a car mono amplifier operates only on the left or right! Is it true? I have an Olympus Hifonics subwoofer 15''4800 thinking of buying the BXi2008D Hifonics Brutus Mono Amplifier 2000W amp, but I'm not sure, because I wouldnt be able afforable two! What can I do? Brutus or its ok?