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Can non-70v amplifiers be used with 70v ceiling speakers?
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<blockquote data-quote="Brad Weber" data-source="post: 18888" data-attributes="member: 114"><p>Re: Can non-70v amplifiers be used with 70v ceiling speakers?</p><p></p><p>Simple answer, Ohm's law says that you can direct drive an 8 Ohm load at 70.7V based on P=V**2/R, which is (70.7)**2/8 or 625W, so an amp rated around 625W into 8 Ohms can direct drive a typical 70.7V system. As already noted, especially with lower cost speaker transformers it may be desired to apply a high pass filter to avoid saturating the transformers at low frequencies. Lower output amps can also often be used to drive 70V systems by adding external output transformers.</p><p></p><p>In regards to reusing the existing speakers and wiring, I understand wanting to save the client money and also wanting to get the work but will you potentially be assuming responsibility for the apparently approximately 30 year old existing work and equipment? Have you verified that everything is working properly? Is the existing work properly documented or will you be doing that?</p></blockquote><p></p>
[QUOTE="Brad Weber, post: 18888, member: 114"] Re: Can non-70v amplifiers be used with 70v ceiling speakers? Simple answer, Ohm's law says that you can direct drive an 8 Ohm load at 70.7V based on P=V**2/R, which is (70.7)**2/8 or 625W, so an amp rated around 625W into 8 Ohms can direct drive a typical 70.7V system. As already noted, especially with lower cost speaker transformers it may be desired to apply a high pass filter to avoid saturating the transformers at low frequencies. Lower output amps can also often be used to drive 70V systems by adding external output transformers. In regards to reusing the existing speakers and wiring, I understand wanting to save the client money and also wanting to get the work but will you potentially be assuming responsibility for the apparently approximately 30 year old existing work and equipment? Have you verified that everything is working properly? Is the existing work properly documented or will you be doing that? [/QUOTE]
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