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Both packages include a one year manufacturer warranty. Headphone only package ships with just CA-1a Circum Aural headphone, no cables or interface box included, Standard Package ships with the CA-1a Circum Aural Ribbon Headphone and complete TI-1a package which includes:
TI-1a Transformer Interface
OB Compensation barrel for Balanced XLR & Single-Ended RCA amplifier inputs
HPL Cable for connecting TI-1a to conventional 4-pin XLR headphone level amp output
SC2 Cable for connecting True-Ribbon™ headphones to TI-1a interface