For anyone in the future researching this topic, here's the answer I got from Apogee customer support-
Me:
Product: Ensemble Thunderbolt
Platform: macOS 13.x Ventura
Country: United States
Subject: Ensemble support, and compatibility
Description: Hi, I'm looking at buying a used Ensemble until I can afford the Symphony MkII SE for mastering. The Ensemble has all of the options and I/O I'm looking for in an interface. But I'm wondering if it's still compatible with M1 Macs and the current OS? How long does Apogee plan to support this product? How are the converters compared to the Symphony MkII? You guys should really come out with an updated Ensemble! Thanks
Apogee CS: Yes Ensemble Thunderbolt is compatible with all current Intel, M1 and M2 Macs up to OS 13.
Although these units are no longer in production there is no end of support date as yet.
We'll continue driver updates for future Mac hardware and OS versions for years to come. Generally this is at least 5 years until this is declared a legacy product.
You can see the current software/firmware for Ensemble Thunderbolt here, this is:
Apogee Control Software Version: 6.0.25
Firmware: Firm 1.5.3.6, FPGA 0.56
You will download the Ensemble Thunderbolt driver here
The complete guide is here
The specs for Ensemble and Symphony Mk II are very closely matched, Symphony Mk II would be technically higher but you would likely not notice any difference in a blind test.
You can compare the specs for both here:
Ensemble Thunderbolt
Symphony Mk II
We may have new units announced later in the year but currently I don't have any timeline on when this will be released.
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New units, they say? Sounds like there could be an updated Ensemble in our future :O