Red Wine Audio Isabella preamplifier
This battery-powered “little jewel” can be configured in a basic version, with options for a DAC and a headphone amplifier available for a little more. Due to the SMART battery charging technology, this preamp shifts to AC power when the juice is running low and automatically starts the recharging process. We were mightily impressed and felt that the Isabella was much quieter than any preamplifier we have heard at this price point.