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Junior Varsity
How many watts is my sub getting
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<blockquote data-quote="Brad Weber" data-source="post: 24368" data-attributes="member: 114"><p>Re: How many watts is my sub getting</p><p></p><p></p><p>You may be without knowing it. The "follows the program material" comment simply means that the output of the amp and the power delivered to your speakers is not constant, it varies as the signal varies. If you have no signal you have no output and thus no power delivered to the speakers.</p><p></p><p>The voltage aspect is a bit more complex but is generally addressing the fact that amplifiers do not output power, they output voltage and current. That voltage and current then result in power delivered into the load that they are driving, in this case into the speakers, so the load is an active component in determining the power. Since a typical speaker has an impedance that varies greatly with frequency (your TH-118 may be a nominal 4 Ohm impedance but the actual impedance is as low as 3 Ohms at 67Hz and over 9 Ohms at around 95Hz) and the amplifier's output voltage is varying based on the input signal, that means that the power delivered into the speaker is constantly varying.</p><p></p><p>I think the disconnect is that you were likely wanting to know the maximum that the subs could see based on the nominal amplifier and speaker ratings rather than "How many watts is my sub getting from the amp?", which is going to constantly vary. Your amp is rated at 1,200W per channel into 4 Ohms (20-20kHz, 0.1% THD) in stereo mode and 4,200W into 4 Ohms (1kHz, 1% THD) in bridge mono mode. Since your dealing with a sub and the bridge mono rating is at 1kHz, you'd realistically get less than that.</p></blockquote><p></p>
[QUOTE="Brad Weber, post: 24368, member: 114"] Re: How many watts is my sub getting You may be without knowing it. The "follows the program material" comment simply means that the output of the amp and the power delivered to your speakers is not constant, it varies as the signal varies. If you have no signal you have no output and thus no power delivered to the speakers. The voltage aspect is a bit more complex but is generally addressing the fact that amplifiers do not output power, they output voltage and current. That voltage and current then result in power delivered into the load that they are driving, in this case into the speakers, so the load is an active component in determining the power. Since a typical speaker has an impedance that varies greatly with frequency (your TH-118 may be a nominal 4 Ohm impedance but the actual impedance is as low as 3 Ohms at 67Hz and over 9 Ohms at around 95Hz) and the amplifier's output voltage is varying based on the input signal, that means that the power delivered into the speaker is constantly varying. I think the disconnect is that you were likely wanting to know the maximum that the subs could see based on the nominal amplifier and speaker ratings rather than "How many watts is my sub getting from the amp?", which is going to constantly vary. Your amp is rated at 1,200W per channel into 4 Ohms (20-20kHz, 0.1% THD) in stereo mode and 4,200W into 4 Ohms (1kHz, 1% THD) in bridge mono mode. Since your dealing with a sub and the bridge mono rating is at 1kHz, you'd realistically get less than that. [/QUOTE]
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