I've just purchased and installed a pair of Pioneer 6.5's 3 way speakers in my 89. Now the speaker is kinda just bolted on but there is nothing around it kinda just hanging here. I go to play some music and no bass is heard. I know it's not a sub, but i do expect a fair amount of bass should be heard. Is this due to the fact that behind the speaker it's just open?? I'm planning on powering a pair of 10's but still would like to get all the performance from these speakers as i can. Kinda shopping around for a Amp right now.