A pre-amp switches between source components (DVD, CD, phono, etc) and either attenuates it or boosts it a small amount and then it is passed on to the power amplifier. It is also sometimes called a control amplifier.
The power amplifier has no switching duties. It takes the signal from the pre-amp, and (drun roll please) amplifies it, or increases the voltage and current, to a level that will drive a typical speaker.
An integrated amp has input selection, volume control and final amplification all on one chassis. A receiver adds FM/AM/(maybe Sat or HD) to the integrated amp.
For multi-channel audio and video, a surround sound or AV processor is the functional equivalent of a pre-amp. It has source selection, volume control, and digital/surround sound processing built into a single chassis, but not power amplification. So yes, you are correct, for AV separates, you will need an AV processor and a multi-channel amp or amps. Assuming you use a powered sub, you would need either 5 or 7 channels of amplification for a 5.1 or 7.1 channel set-up.
Your room is pretty small so you are not going to need gobs of power, esp. if you set up your front L & R channels as "small speakers", thereby sending most of the low frequency power hungry information to a sub. There are many good AV processors out there. If you give us a budget, we can provide some specific recommendations. Most of all, have fun.
The power amplifier has no switching duties. It takes the signal from the pre-amp, and (drun roll please) amplifies it, or increases the voltage and current, to a level that will drive a typical speaker.
An integrated amp has input selection, volume control and final amplification all on one chassis. A receiver adds FM/AM/(maybe Sat or HD) to the integrated amp.
For multi-channel audio and video, a surround sound or AV processor is the functional equivalent of a pre-amp. It has source selection, volume control, and digital/surround sound processing built into a single chassis, but not power amplification. So yes, you are correct, for AV separates, you will need an AV processor and a multi-channel amp or amps. Assuming you use a powered sub, you would need either 5 or 7 channels of amplification for a 5.1 or 7.1 channel set-up.
Your room is pretty small so you are not going to need gobs of power, esp. if you set up your front L & R channels as "small speakers", thereby sending most of the low frequency power hungry information to a sub. There are many good AV processors out there. If you give us a budget, we can provide some specific recommendations. Most of all, have fun.