I havent seen alot of threads with people who have installed stereos on their STs, I just finished mine, thought you might like it
I used this speaker/amp combo, mounted to the bars nicely, Amp, tucked in left fairing pocket with plenty of room to spare
https://www.amazon.com/BOSS-Audio-MCBK420B-Weatherproof-Applications/dp/B00T3QBL3M/ref=sr_1_12?ie=UTF8&qid=1505777587&sr=8-12&keywords=motorcycle+stereo
Blocks a bit of the lower half of the speedo, and the lower half of the tach, but not bad.
Very loud and clear even over 100.
I used this speaker/amp combo, mounted to the bars nicely, Amp, tucked in left fairing pocket with plenty of room to spare
https://www.amazon.com/BOSS-Audio-MCBK420B-Weatherproof-Applications/dp/B00T3QBL3M/ref=sr_1_12?ie=UTF8&qid=1505777587&sr=8-12&keywords=motorcycle+stereo
Blocks a bit of the lower half of the speedo, and the lower half of the tach, but not bad.
Very loud and clear even over 100.