The SF-24 Live is an active, stereo ribbon microphone, suitable for studio use but intended for stage use. Although as of this writing (Sept 2010), the SF-24L can’t be found on the Royer Labs website, the product is available as a special-order item (at no additional cost).
The two mics share sensitivity and frequency-response specifications, as well as a transformerless FET circuit design for impedance conversion.
For more information, see the SF-24 profile.
The Royer Labs SF-24 Live is also known as: SF-24L.