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Damping Factor - Actual listening tests?
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<blockquote data-quote="John Roberts" data-source="post: 145732" data-attributes="member: 126"><p>Re: Damping Factor - Actual listening tests?</p><p></p><p></p><p>Pad? The headphone is a floating differential device that will express only the difference between the two speakers. Driving both speakers from a single channel there will be a flat wide band error for wire R, and a non-flat difference caused by the loudspeakers non-flat impedance. If you drive the speakers from two different amp channels you can use the gain on one to trim out the wide band component and only get the non-flat error. I might try to predict what this error will sound like from your speaker's impedance plot. </p><p></p><p></p><p>I don't know why you are fixated on DF. I wrote about this in my Audio Mythology column back in the '80s. It's an old subject we hashed to death over at PSW too. </p><p></p><p>Stop thinking about DF as some mysterious phenomenon. The wire and speaker are forming a simple voltage divider. So the top R is the wire DCR (well mostly DC), and the bottom R is the loudspeaker's resistance (hint not a simple DC resistance). For hundreds of feet of wire and low impedance loudspeaker that can vary a few ohms between 20Hz an 20kHz you can use math to calculate a projected frequency response error.</p><p></p><p>The problem with running low bass through step-up and step-down transformers is the core size has to double for every halving of the LF cut off. So a 20 Hz transformer has to be twice as large as a 40 Hz transformer to handle the same power. For perspective the audio transformers will be 2-3x the size of the mains power transformer in the amp. </p><p></p><p>You need to look at the impedance plots for your actual speakers and determine how sensitive they will be to the wire resistance you expect to use in series. </p><p></p><p>JR</p><p></p><p>PS: I recall one old exchange over at PSW with a fan of funny speaker wire who claimed he experienced some small gauge funny wire that sounded better to him that old school heavy gauge zip cord. After a little discussion we determined that the combination of his high resistance wire, and speaker impedance that varied vs frequency was creating an audible HF boost (actually LF was cut relative to the HF).</p></blockquote><p></p>
[QUOTE="John Roberts, post: 145732, member: 126"] Re: Damping Factor - Actual listening tests? Pad? The headphone is a floating differential device that will express only the difference between the two speakers. Driving both speakers from a single channel there will be a flat wide band error for wire R, and a non-flat difference caused by the loudspeakers non-flat impedance. If you drive the speakers from two different amp channels you can use the gain on one to trim out the wide band component and only get the non-flat error. I might try to predict what this error will sound like from your speaker's impedance plot. I don't know why you are fixated on DF. I wrote about this in my Audio Mythology column back in the '80s. It's an old subject we hashed to death over at PSW too. Stop thinking about DF as some mysterious phenomenon. The wire and speaker are forming a simple voltage divider. So the top R is the wire DCR (well mostly DC), and the bottom R is the loudspeaker's resistance (hint not a simple DC resistance). For hundreds of feet of wire and low impedance loudspeaker that can vary a few ohms between 20Hz an 20kHz you can use math to calculate a projected frequency response error. The problem with running low bass through step-up and step-down transformers is the core size has to double for every halving of the LF cut off. So a 20 Hz transformer has to be twice as large as a 40 Hz transformer to handle the same power. For perspective the audio transformers will be 2-3x the size of the mains power transformer in the amp. You need to look at the impedance plots for your actual speakers and determine how sensitive they will be to the wire resistance you expect to use in series. JR PS: I recall one old exchange over at PSW with a fan of funny speaker wire who claimed he experienced some small gauge funny wire that sounded better to him that old school heavy gauge zip cord. After a little discussion we determined that the combination of his high resistance wire, and speaker impedance that varied vs frequency was creating an audible HF boost (actually LF was cut relative to the HF). [/QUOTE]
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