Nobody. If you are both happy then price is irrelevant. I think you got the better deal, but you never know, he may have gotten a smoking deal on those woofers in the first place. Besides, he may have gotten them on a trade and it was more than he wanted in his truck and a single 10" would suffice... I prefer Sound QUALITY over Loudness so I would opt for a nice single 10" in my car just for the bass sound.
Ask him how he's liking the 10" and if he is allthen don't worry about it.
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