What made you put together your first 2nd system?

I think it's !, not ? or maybe . :-)

Regards

My secondary system was developed for use outside on the deck. I enjoy country living and listening to music on a relaxing afternoon (retired). It is kept indoors and placed out for sessions.

The family room system serves primarily to augment TV viewing.

My main system is located in my bedroom which is setup for audio.  

My first system is so good i do not need 2 systems.

I have two “second systems”. One is the basement in my exercise space and is composed of leftover components that I hung on to too long and when I finally decided to sell them I learned just how much they had depreciated so kept them. The second “second system” is at our country cabin and is built around gear that I always lusted after way back when I was getting started in this hobby, but couldn’t afford then like the beautiful Meitner mahogany encased mono blocs and pre.  Depreciation works both ways 😀

Then there’s the Oppo/B&K/Totem video surround setup, the Pioneer receiver/Advent garage setup, backyard Onkyo/Polk setup, bedroom Scott/Design Acoustics setup. I’m sure I’m forgetting something, but I don’t really consider these “systems”. Way too much stuff!

Clear from the OP that second systems are not done out of dissatisfaction for the first, pace ebm. 

If I start a second system, it would likely get its fuel from two different motives; first, I have extra gear that is not worth selling nor worth giving away. Example, I have some Adcom gear that sounds quite decent but is not worth much. It could form a nice second system.

Another motive might be to have a solid state system with different power and speakers which crave it OR a low power system with high efficiency speakers and a sweet low-watt tube amp.