Mac Mini versus PC sonic differences, why?

I use a regular MacBook with a firewire Interface and I think it sounds great. I've never tried a MiniMac. I've also never tried a Windows based PC with the firewire interface. However, I previously had used a USB 2.0 interface with my MacBook
and when I listened to a PC with the USB it sounded identical to the MacBoook.
I am very skeptical that a MacMini would outclass any other Mac unless it turned out that there was some fundamental difference in the two computers beyond hard drive and RAM.

How does the extra 2 gig of RAM (to 4 gig) improve the sound quality? Just bought my mac mini a week ago...

I wouldn't say that the extra 2gig improves the sound per se. I would say that it increases the processing power of the Mac Mini so that it can do a lower-latency job at processing the sound. That ultimately means better sound quality. Diminishing returns still apply, 4gb is plenty for audio purposes.

Quote from Ballan above:
"If you do use a Mac Mini, having at least 4GB of RAM and a SSD will help it sound better. It's subtle, but an improvement. The SSD will definitely improve the overall performance and responsiveness of the Mac, and it's hard to go back to a standard hard drive after using one."

Does the Solid State drive make it quieter? I find the fan level and pitch annoying. (I moved it across the room with a 20-foot DVI monitor cable.) Did you send it to TekServe or somewhere else to get the SSD installed? I've got the 2-harddrive server Mini.
Thanks in advance.

@Rgs92: A SSD will be mechanically quieter and allow the audio signal to sound better. It appears that when a standard hard drive is spinning up it puts more strain on the power supply, which effects the audio quality. It's subtle, but SSD consistently sounds better to most people who listen.

The biggest improvement that everyone does notice is the performance and responsiveness of the operating system and applications. SSD offers the biggest performance improvement that can be offered, even more so than lots of RAM. Everything is fast and stable because the disc doesn't have to spin to read the data,. Apps immediately open and the OS is lighting fast.

Since you have the "server" version you have an extra obstacle. One of the drives is for the OS and apps, and if you replace it with a SSD you will get the faster performance, but since you would still have the standard drive internally, you may not see a sound quality improvement because it's still a spinning (taxing) drive. It all depends on how you choose to use the second drive.

This is why I suggest to my clients that they use a Mac Mini with an SSD for the OS and apps, and use a NAS or other network storage for the music and media. The SSD helps the Mini operate and sound better, while a BIG NAS is on the network, away from the Mini and listening room, allows all the storage necessary for large music and media collections.

If you have a newer Mac Mini (unibody) you should be able to replace the main drive fairly easily, but if you have a older Mini, it's best to take it to a Apple Specialist shop or an Apple Store. Let me know if you need any help and I can recommend the people I use. Hope this helps.