Get a Boost Box - I looked at all the App's some work, some don't, most require you to be plugged using your AUX. Then they don’t support I-pod, USB Drives, Hell CD’s ( if anyone still uses them) etc...
I installed the Boost Box and went to the lake for a week following Memorial Day, I was blown away at how well it works. OK it’s no HSE but it is a very simple device, but it works great. I installed mine on top of Sub under the dash not very convent for adjusting but I never had to adjust it, I set to once and forgot all about it.
This was the first trip where we weren't fumbling for the remote to turn the Stereo up and down.
Not Perfect - but I have Zero complaints