Twenty-five watts can sound very, very good. It combines ample power to energize many speaker loads from 2 ohms to 16 ohms, the musicality of premium vacuum tubes, and the accuracy and pristine specifications that come from Bob’s 50+years of design expertise.

Bob’s “listen to the room” innovation is facilitated by a special current feedback loop that allows the amplifier to ‘hear’ the room’s reverb, along with its unique sonic signature. Each room plays its own tune, and this amp uses the speaker as a microphone by using the speaker in reverse to listen to the room, thereby allowing a portion of the room acoustic to be expressed through the main speakers.

The room becomes an integral part of the music in a way no other

amplifier allows. Sound is more majestic, more realistic, and the sound stage is larger and more compelling. 
This phenomenon is impossible to achieve with normal solid-state amplifier designs, whose low source (output) impedance effectively shorts out the speaker’s ability to accomplish this feat.

The Black Magic 25's DC Restorer circuit is an exclusive to Bob Carver designs, It keeps the output tubes running cool, prolonging their life to beyond 50 years! Other amplifier tubes operate at a very high idle power to keep distortion low, frequency response extended, and for other technical reasons. The downside is that tube life is drastically shortened, about three to six years at the most. Worse yet, tube performance begins to deteriorate as soon as the amp is turned on. In addition to extended tube life, Bob Carver Company’s DC Restorer eliminates the need to purchase expensive matched tubes for the Black Magic 25. • Unique transformer design delivers enormous power through an increased turns ratio, with two extra interleaved windings, each bifilar wound on a core of highest quality, grain oriented, silicon steel (Bob’s term for it is admantine. Google it. ) with a pure nickel center section. The secondary’s are wound with oxygen-free copper wire and 98% pure silver wire for the critical internal connections.