More sound?!?!

So I love jamming out to music in my truck but I would like more sound. What's a good route to go? I was thinking maybe speaker box under or behind the back seat? What have you guys done?

 

I upgraded the Head Unit, all speakers, amp, and put a 10 inch JL Audio behind the rear seat. I get so much bang in my truck I hear my in channel vent visors rocking. And to increase the Sound Stage I put the tweeters in the black triangles that cover the mirrors. Got all my speaker adapters made by @Mr Marv and my sub box. He is great you tell him what speakers and sub you bought, and he builds the adapters and the sub box to meet them.

 

Read the thread: "Premium Audio Upgrade for less than $200" I think I'm going that route!!!

 

I went that route with my 2016 and couldn't be happier (for $ spent) i replaced the useless factory tweeters with the Kicker Subaru ones (direct fit and factory harness plugs directly into these) also did the Kicker CS 6x9's (front doors) and 6 3/4's (rear doors) and the difference in sound is amazing to my ears