Pretty simple then ... just be honest about not having the space for the speakers. Don't make it about the sound as you already have speakers you like. Offer to help him sell them or alternatively, out of respect for you neighbor, offer to post them on an audio site and give them away free to a good home, if someone wishes to pick them up.
My dad owned a mom and pop store that repaired TVs, stereos, and appliances. He had not worked the business for 30 years, so there was a fair amount of old, used electronics still in the store when the time came to sell the store. We had very little time to liquidate, so I wound up giving away much of the stuff. I contacted magazine editors, radio personalities, and original manufacturers' museums and several came out and I gifted the stuff to them. It was about respecting my dad and as long as the stuff wound up with someone who wanted it, it was OK.
Rich
My dad owned a mom and pop store that repaired TVs, stereos, and appliances. He had not worked the business for 30 years, so there was a fair amount of old, used electronics still in the store when the time came to sell the store. We had very little time to liquidate, so I wound up giving away much of the stuff. I contacted magazine editors, radio personalities, and original manufacturers' museums and several came out and I gifted the stuff to them. It was about respecting my dad and as long as the stuff wound up with someone who wanted it, it was OK.
Rich