Looking at specs of Terminator II 12th vs 15th - I only see a few differences:
Terminator II 12th (from Vinshine site):
- Oven Controlled Crystals OCXO
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THD: 0.08%(RCA), 0.004%(XLR)
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S/N Ratio: 105dB(RCA), 115dB(XLR)
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Warranty: 36 Months
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Price USD $4,929.76
Terminator 15th - they seemed to have dropped the, "II" (from Denafrips site) :
- High-end Oven Controlled Crystals OCXO
- THD: 0.05%(RCA), 0.002%(XLR)
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S/N Ratio: 110dB(RCA), 120dB(XLR)
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Warranty: 12 Months (but their support page says 3 years)
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Price $6,099.00 (USD$ - not sure)