Mixed connection of acoustics to an amplifier with two bridged channel outputs (option 2). Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Speakers
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For radio tape recorders with a four-channel bridge amplifier, which is equipped with almost all modern models, the above options for switching on the speakers can be combined in various ways. For example, using both "low-frequency mono" and a conventional (non-bridged) connection scheme (Fig. 19), according to the resulting scheme, you can connect a subwoofer and "tweeters" or rear speakers (with bandwidth limitation), and use the remaining channels for the front speaker. Since this option uses inverting and non-inverting UMZCH outputs, pay attention to the polarity of connecting the heads. In a word, there are many options - it would be a fantasy.
Fig. 19
Author: A. Shikhatov; Publication: bluesmobile.com/shikhman
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