What mates with J28 / J30 (Audio Interface Board) on the TPA3255EVM?
and, BTW, the BOM is INCORRECT concerning the Part Number for J28.
BOM says it is a Samtec SSQ-108-02-G-D. That would be a 8x2 connector.
The actual part on the EVM is more likely a Samtec SSW-114-02-G-D.