This is a playlist of keyboards that I've tested, which should help you gauge how loud they are compared to one another.

These were captured with a Logitech USB microphone placed a consistent distance (roughly 6") above the keyboard.  They were recorded with the same levels (100%) by the same program (Audacity on Win64), and saved in a lossless format (FLAC, level 5).

Razer Blackwidow Stealth 2014

Logitech G810

Logitech G610

This is a playlist of keyboards that I've tested, which should help you gauge how loud they are compared to one another.

The first phase of the test is a typing test - I'm trying to type the phrase "This is a test of the emergency broadcast system."  I don't backspace over mistakes to try and keep the time constant.  

The second phase is rapidly hitting one key (j) as hard as possible.  On mechanical keyboards, this is the sound the key will make when bottoming out.

The third phase is rapidly hitting one key (j) as light as possible with it still registering in Notepad.  

Next, I mash the space bar as fast as I can.

Finally, on keyboards that have extra keys using different switches, I hit those keys rapidly for a few seconds.

These were captured with a Logitech USB microphone placed a consistent distance (roughly 6") above the keyboard.  They were recorded with the same levels (100%) by the same program (Audacity on Win64), and saved in a lossless format (FLAC, level 5).

Without the Sarcasm