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What amp is better for subwoofer?
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<blockquote data-quote="Vladimir Kuzmin Sr." data-source="post: 215688" data-attributes="member: 15095"><p>Art, thanks for the nice addition, it shows your understanding of the process in the amplifier. I completely agree with it. I didn't go deep into it, hoping someone would ask deeper questions or make comments like yours. In the post I did not count the value calculated by the formula as damping factor DF, I just called it a 'conditional value df', indicating "We can conclude that this "df" in lows depends on energetic behavior of power supply" which you confirmed with your clarification. I still don't know what to call this value, I just called it Kd, not DF or df. The user has no exact knowledge of how the amplifier will behave at LF, the specifications do not specify anything other than these two values. Of course, the value of 20 is a conditional smooth boundary, not an exact one. The amplifier and its power supply start to behave strangely near maximum power, which is typical for subwoofers. In this mode, the amplifier even may have no negative feedback, and the driver itself may not only have low impedance, but also act as an oscillator. In my work (this is the sounding of large spaces) I have often found that cheap conventionally powered amplifiers do not behave well when powering subwoofers, while labgruppen type amplifiers behave fine not only to power subwoofers, but also as wideband amps, increasing the efficiency at LF. Thank you again.</p></blockquote><p></p>
[QUOTE="Vladimir Kuzmin Sr., post: 215688, member: 15095"] Art, thanks for the nice addition, it shows your understanding of the process in the amplifier. I completely agree with it. I didn't go deep into it, hoping someone would ask deeper questions or make comments like yours. In the post I did not count the value calculated by the formula as damping factor DF, I just called it a 'conditional value df', indicating "We can conclude that this "df" in lows depends on energetic behavior of power supply" which you confirmed with your clarification. I still don't know what to call this value, I just called it Kd, not DF or df. The user has no exact knowledge of how the amplifier will behave at LF, the specifications do not specify anything other than these two values. Of course, the value of 20 is a conditional smooth boundary, not an exact one. The amplifier and its power supply start to behave strangely near maximum power, which is typical for subwoofers. In this mode, the amplifier even may have no negative feedback, and the driver itself may not only have low impedance, but also act as an oscillator. In my work (this is the sounding of large spaces) I have often found that cheap conventionally powered amplifiers do not behave well when powering subwoofers, while labgruppen type amplifiers behave fine not only to power subwoofers, but also as wideband amps, increasing the efficiency at LF. Thank you again. [/QUOTE]
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