Hi,
The OmegaStar 250EX is the AVA OmegaStar circuits installed in a Hafler DH-200/220 chassis. The amp is an excellent performer with great sonic clarity and definition.
The OmegaStar series was replaced with the current Insight+ series, which is a sonic improvement over the OmegaStar series of amps. The OmegaStar 250EX can be upgraded to the Insight+ series for those who want the latest generation.
Thank You.
Larry