Looks like they only work through integrators, which is a pain, but I found this over at Audio Science.
X9:
• ES9038PRO SABRE audiophile DACs (140 dB of dynamic range)
• 16 channel XLR outputs with OPA1612 HiFi Audio op-amps
• Price: $9,600
X7:
• ES9026PRO SABRE DACs (124 dB of dynamic range)...