21. Rack mountable power amplifiers were the genesis of the company. 22. Channel specific multi-watt toggles dictate the power amplifier 's operation class. 23. The 2 circuits make up each power amplifier per channel. 24. The first Heed Nexus amplifier was a bridged-mode power amplifier . 25. BMS phonographs lacking a power amplifier or internal speaker could have an optional preamplifier. 26. The band worked by setting up all the instruments with only a single power amplifier . 27. It is incorporated in VAC power amplifiers as the iQ Intelligent Continuous Automatic Bias System. 28. A common setup is the use of a tube preamplifier with a solid-state power amplifier . 29. When higher power amplifiers emerged, especially in professional sound, the limitations of aluminium were exposed. 30. An audio power amplifier is usually used to amplify signals such as music or speech.
