Reply to Neighbors complaining about noise

So a few months ago it was brought to my attention that my neighbor 2 houses away can hear me when I'm mixing. Admittedly, I like my music loud but I didn't believe it was loud enough to be travelling through my walls, through an entire other house and into his backyard over 50 feet away.

I apologized and have taken steps to reduce the noise travel including playing my music quieter, lowering my subwoofer to 50% instead of 100% (I assume he's hearing the bass the most since it shakes my house as well) and even ordering an Auralex Subdude for my subwoofer, though it's been months and Amazon still hasn't shipped it.

Without spending a lot of money soundproofing my room/house and compromising my own enjoyment by turning the volume down more than it is (right now I can have a conversation with others while it's playing, as in it's not very loud at all), is there any advice anyone could give? Also if someone could supply me with a link to a place that actually HAS Auralex Subdudes to ship, that would be much appreciated since Amazon has dropped the ball on this one.


NOTE: I've checked my city's sound violation laws and I'm well within compliance of them. I also only mix between 12 PM and 4 PM so I don't disturb people while they're eating dinner or sleeping.