If you are shopping between a 8TiHc or a Pass X600, then X600 is perhaps a better bet (although the X-series will be discontiued pretty soon as well). X600 has better transient response and a better defined mid to low bass.
Per my conversations with Pass last week, there are no plans to discontinue the X-series. The x-series continue to be a viable amplifier for those who need high current amps with lots of power.
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