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<blockquote data-quote="XTRProBoy" data-source="post: 2456920" data-attributes="member: 571009">^Just to clarify a bit more...&nbsp; Class D amps designed for low frequencies only actually have a low pass crossover set at a value such as 200Hz or 250Hz.&nbsp; If the crossover weren&#039;t there, the amp wouldn&#039;t actually stop producing sound after that frequency but would do so rather horribly, LOL.&nbsp; After the lower frequency range the reproduction of sound becomes quite bad--filled with distortion and noise.Therefore every Class D amp will have a low pass crossover such as that built-in and non defeatable (the best you can do is dial it up to the highest frequency allowed).&nbsp; The crossover usually has a slope of -12dB/octave or greater so yes it would have some small output but several &quot;dB down&quot; after the crossover frequency.The fact that most Class Ds are only designed for low frequency and have such a crossover is of no real issue anyway.&nbsp; Since they are designed to drive subs, that LP crossover will usually be dialed down to 80Hz or so (or crossed over at the HU at such a frequency), meaning they aren&#039;t usually used for anything even near 250Hz anyway.There are some class D designs that offer full range operation, but they are not that common.&nbsp; Class T is also very similar in efficiency and also offers full-range operation.</blockquote>

[QUOTE="XTRProBoy, post: 2456920, member: 571009"] ^Just to clarify a bit more... Class D amps designed for low frequencies only actually have a low pass crossover set at a value such as 200Hz or 250Hz. If the crossover weren't there, the amp wouldn't actually stop producing sound after that frequency but would do so rather horribly, LOL. After the lower frequency range the reproduction of sound becomes quite bad--filled with distortion and noise. Therefore every Class D amp will have a low pass crossover such as that built-in and non defeatable (the best you can do is dial it up to the highest frequency allowed). The crossover usually has a slope of -12dB/octave or greater so yes it would have some small output but several "dB down" after the crossover frequency. The fact that most Class Ds are only designed for low frequency and have such a crossover is of no real issue anyway. Since they are designed to drive subs, that LP crossover will usually be dialed down to 80Hz or so (or crossed over at the HU at such a frequency), meaning they aren't usually used for anything even near 250Hz anyway. There are some class D designs that offer full range operation, but they are not that common. Class T is also very similar in efficiency and also offers full-range operation. [/QUOTE]

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