NOTE: This is the HSA-1a amplifier which was replaced by the current HSA-1b version that added a 1/4” TRS connection, moved all switches to the front, and a volume control with 24 position stepped-attenuator.

RAAL-REQUISITE DESCRIPTION: The SR1a is the world’s first Earfield headphone monitor. Experience mixing, mastering, and home listening with unparalleled accuracy and realism in a sound-field devoid of room acoustics and comb-filtering caused by work surface reflections. Earfield technology delivers unheard of program accuracy and a speaker-like sound-field experience. The HSA-1a is a direct drive amplifier for the SR1a Earfield Monitors, as well as conventional dynamic/planar headphones, and speakers. The input options include Unbalanced Single-Ended RCA and Balanced XLR.

CONDITION: Purchased new in 2020 and lightly used in home for only six months. Then installed a loudspeaker system and boxed the RAAL system up for possible future use, which never happened. Both the monitors and amplifier are in excellent condition, and professional hardcase has never been used.

INCLUDES: SR1a Earfield Monitors, Standard 7ft Cable, HSA-1a Amplifier, AC Power Cord, and Professional Roller Carry On Hardcase.

PRICE: Purchased new for $7400. RAAL-requisite now sells this combination with HSA-1b amplifier for $8000. Purchase this system for $4000 with free shipping!

RETURNS: No returns accepted.

SHIPPING: Free via FedEx Ground or FedEx Home Delivery. Will ship insured with direct signature required for delivery.

REVIEWS: Detailed reviews at Audiophile Style, Headphones.com, Headphone Guru, with a more detailed list of reviews on the RAAL-requisite website.