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Silverado DDZ build
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<blockquote data-quote="hispls" data-source="post: 8440188" data-attributes="member: 614752"><p>I'd consider that the wrong coil. But wait for 72 to post some measurements of the gap and coil before you actually add to the "I got scammed" section.</p><p></p><p>Dayton DATS (at Parts Express) is the correct tool to find TS parameters on speakers and to do impedance graphs. Alternately if you have a current clamp, set your volume so that you have 10V (for simplicity of math) at all frequencies, then measure current (keeping that level of output). Use Ohm's law to solve for Z and plot it out on graph paper. Don't cheat and try to skip 5 cycle increments, do every frequency, the difference between a couple cycles can be big with a low Q driver. In the olden days we used to have to plot impedance curve like that (twice) to find TS parameters of unknown drivers. To calculate Vas you'll need a known-volume sealed box, or some known value masses (6oz fishing weights work pretty well)</p><p></p><p>By all accounts you do NOT want to play around with low impedance with Brazilian amps. Totally not worth the risk for what you'll gain.</p></blockquote><p></p>
[QUOTE="hispls, post: 8440188, member: 614752"] I'd consider that the wrong coil. But wait for 72 to post some measurements of the gap and coil before you actually add to the "I got scammed" section. Dayton DATS (at Parts Express) is the correct tool to find TS parameters on speakers and to do impedance graphs. Alternately if you have a current clamp, set your volume so that you have 10V (for simplicity of math) at all frequencies, then measure current (keeping that level of output). Use Ohm's law to solve for Z and plot it out on graph paper. Don't cheat and try to skip 5 cycle increments, do every frequency, the difference between a couple cycles can be big with a low Q driver. In the olden days we used to have to plot impedance curve like that (twice) to find TS parameters of unknown drivers. To calculate Vas you'll need a known-volume sealed box, or some known value masses (6oz fishing weights work pretty well) By all accounts you do NOT want to play around with low impedance with Brazilian amps. Totally not worth the risk for what you'll gain. [/QUOTE]
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