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Damping Factor - Actual listening tests?
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<blockquote data-quote="Frank Koenig" data-source="post: 145731" data-attributes="member: 416"><p>Re: Damping Factor - Actual listening tests?</p><p></p><p>For the rare case where there is sufficient cable resistance to appreciably affect the response of a woofer near the box resonance frequency there are amplifiers available with adjustable negative output resistance. The Powersoft K series can do this for frequencies below 400 Hz. Bear in mind that by using negative output resistance you're flirting with instability. I run my Powersofts at zero output resistance (guaranteed stability) and use reasonably short, fat cables on subs. Thankfully, in situations where I've needed longer speaker runs it's been voice-only and high-passing pretty much avoids concerns about bottom octave response due to cable resistance.</p><p></p><p>For steady-state it should be possible to correct for cable resistance with EQ (within limits). It's more complicated for transients and I'd have to crawl off and think about it.</p><p></p><p>Yet another problem that will go away someday when ALL speakers are powered.</p><p></p><p>--Frank</p></blockquote><p></p>
[QUOTE="Frank Koenig, post: 145731, member: 416"] Re: Damping Factor - Actual listening tests? For the rare case where there is sufficient cable resistance to appreciably affect the response of a woofer near the box resonance frequency there are amplifiers available with adjustable negative output resistance. The Powersoft K series can do this for frequencies below 400 Hz. Bear in mind that by using negative output resistance you're flirting with instability. I run my Powersofts at zero output resistance (guaranteed stability) and use reasonably short, fat cables on subs. Thankfully, in situations where I've needed longer speaker runs it's been voice-only and high-passing pretty much avoids concerns about bottom octave response due to cable resistance. For steady-state it should be possible to correct for cable resistance with EQ (within limits). It's more complicated for transients and I'd have to crawl off and think about it. Yet another problem that will go away someday when ALL speakers are powered. --Frank [/QUOTE]
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