This email response is from mom:
"Yeah - joseph told me about the speaker thing. Now he takes the car down by the golf course if he wants to play music in the evening. He said the guy [neighbor] was nice but said that he [my kid] was waking his kids up with the shaking of the house from the speaker thing."
Neighbor compliments to another BF design!

Note mom's techical reference "speaker thing"....she has a PhD in EE.