Question: What are the differences in versions?
Answer: Link: please read the info at this link

Attention !

Be carefull due to a hardware change it is NOT possible to combine older versions with units produced after 01-01-2022 !!!
V.10 Main V.10 Extender	01-01-2022	POWER SUPPLY CHANGED TO 12 VOLT INSTEAD OF THE EARLIER USED 36 VOLT MAIN V.10 and EXTENDER V.10 ARE NOT COMPATIBLE WITH OLDER VERSIONS !!! Connecting a older to a newer units will damage the older unit !!!

Version	Date	Airence PCB info and modifications
V.1	06-12-2013	-

V.2	14-01-2014	Airence 1C > Airence 1D: Added Mic-on 2 circuit at Extender

V.3	18-11-2014	Airence 2D > Airence 2E: USB noise reduced at Main
		Airence Main and Extender fronts with Powder Coating

V.4	20-01-2015	Airence 6E > C20, C38, C39, C40 replaced by 0R (wire), to prevent distortion at Announcer and Studio output

V.5	29-04-2015	Airence 9B > Added 8x 100K resistor, protection for peak voltages when connecting a powered Extender
		Airence Main new fronts without Master faders

V.6	28-05-2015	Airence 9B > C64, C65, C66, C67 replaced by 0R (wire), for better ground connection
		Airence Main and Extender remove powder coating at 15pin Sub D connector, for better ground connection

V.7	xx-06-2016	Airence Main 4, 5 and 6 pcb > SMD with different ledbar drivers
		Airence Main Added Digital option
		Airence 3 (Telco) > SMD with added Ring signal to Start jack
		Airence Main Added 100N capacitor to remove Fader start noise in Audio

		Airence V7 (Telco, Voip, Master 4, 5 and 6 pcb) not compatible with older versions due to Communication buss and Digital option. You'll have to replace the complete set except Airence 6 and 7!

V.8	xx-11-2017	Airence 3 (Telco) > R15, R17 replaced by leaded 600mW Resistors R17-R18 modification

V.9	xx-05-2018	Airence 3 (Telco) > R15, R17 replaced by SMD High power
	xx-05-2018	Airence 10E > Mac compatible

V.10 Main V.10 Extender	01-01-2022	POWER SUPPLY CHANGED TO 12 VOLT INSTEAD OF THE EARLIER USED 36 VOLT MAIN V.10 and EXTENDER V.10 ARE NOT COMPATIBLE WITH OLDER VERSIONS !!! Connecting a older to a newer units will damage the older unit !!!