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Designing a crossover for a DIY speaker project
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<blockquote data-quote="thylantyr" data-source="post: 1243220" data-attributes="member: 560358"><p>Check this out.</p><p></p><p><a href="http://www.pesupport.com/cgi-bin/config.pl?read=248407" target="_blank">http://www.pesupport.com/cgi-bin/config.pl?read=248407</a></p><p></p><p>An example of someone designing a 'technically correct' passive crossover in</p><p></p><p>software.</p><p></p><p>Capacitors used;</p><p></p><p>1uF</p><p></p><p>2uF</p><p></p><p>3.2uF</p><p></p><p>5.7uF</p><p></p><p>6.2uF</p><p></p><p>20uF</p><p></p><p>Coils used;</p><p></p><p>100uH</p><p></p><p>200uH</p><p></p><p>390uH</p><p></p><p>1.7mH</p><p></p><p>Resistors used;</p><p></p><p>1.2 Ohms</p><p></p><p>4 Ohms</p><p></p><p>20 Ohms</p><p></p><p>///</p><p></p><p>Which capacitors to use? The best would be Telfon, polystyrene but good luck</p><p></p><p>finding those large values. The realistic choice is foil/film polypropylene but even</p><p></p><p>those are high priced and the capacitors are physically big. What everyone uses</p><p></p><p>is metalized polypropylene which is good, but not elite. Store bought consumer</p><p></p><p>grade speakers will use rock bottom low performing non polarized electrolytics.</p><p></p><p>Price compare;</p><p></p><p>Film/Foil Poly</p><p></p><p>1uF - $10 ea.</p><p></p><p>2uF - $14 ea.</p><p></p><p>3.2uF - $18 ea.</p><p></p><p>5.7uF - $31 ea.</p><p></p><p>6.2uF - $31 ea.</p><p></p><p>20uF - $85 ea.</p><p></p><p>$189 x 2 {two channels} = $378 for elite capacitors. I'm sure if you look hard</p><p></p><p>you can get non-name brands for 1/2 that price, still it's almost $200 just</p><p></p><p>for these caps.</p><p></p><p>Metalized Poly</p><p></p><p>1uF - $1 ea.</p><p></p><p>2uF - $1.5 ea.</p><p></p><p>3.2uF - $1.75 ea.</p><p></p><p>5.7uF - $2 ea.</p><p></p><p>6.2uF - $2.15 ea.</p><p></p><p>20uF - $5 ea.</p><p></p><p>Much better. $13.40 x 2 {two channels} = $26.8</p><p></p><p>Coils;</p><p></p><p>100uH - $2</p><p></p><p>200uH - $2.5</p><p></p><p>390uH - $5</p><p></p><p>1.7mH - $18</p><p></p><p>Coils - $27.5 x 2 {two channels} = $55</p><p></p><p>Resistors are cheap so I won't go there.</p><p></p><p>*Elite capacitor plus coil cost = $433</p><p></p><p>*Good capacitor plus coil cost = $81</p><p></p><p>///</p><p></p><p>If you spend all that time making elite crossover design and used</p><p></p><p>electrolytic capacitors, you should be spanked. If you used metalized poly</p><p></p><p>caps driver cost will be $81 + resistor cost + shipping, over $100.</p><p></p><p>If you feel like you want the elite crossover parts you will spend over $450.</p><p></p><p>If this is a DIY venture, the $250 digital crossover sounds pretty good as</p><p></p><p>it can be used over and over again for future builds assuming you don't use</p><p></p><p>your previous builds. You can also make a passive crossover for your previous</p><p></p><p>build if you wanted to use that loudspeaker or have plans to sell it. If you have</p><p></p><p>plans to sell it, then make a cheap passive crossover. But if you like to DIY</p><p></p><p>speakers the active system pays for itself in no time.</p><p></p><p>The big bonus with active;</p><p></p><p>You can create different sounds from a single design.</p><p></p><p>The passive version is fixed, you can't change component values, crossover slopes,</p><p></p><p>adjust frequency, add delays, etc etc etc.. without designing a whole new passive</p><p></p><p>crossover.</p></blockquote><p></p>
[QUOTE="thylantyr, post: 1243220, member: 560358"] Check this out. [URL="http://www.pesupport.com/cgi-bin/config.pl?read=248407"]http://www.pesupport.com/cgi-bin/config.pl?read=248407[/URL] An example of someone designing a 'technically correct' passive crossover in software. Capacitors used; 1uF 2uF 3.2uF 5.7uF 6.2uF 20uF Coils used; 100uH 200uH 390uH 1.7mH Resistors used; 1.2 Ohms 4 Ohms 20 Ohms /// Which capacitors to use? The best would be Telfon, polystyrene but good luck finding those large values. The realistic choice is foil/film polypropylene but even those are high priced and the capacitors are physically big. What everyone uses is metalized polypropylene which is good, but not elite. Store bought consumer grade speakers will use rock bottom low performing non polarized electrolytics. Price compare; Film/Foil Poly 1uF - $10 ea. 2uF - $14 ea. 3.2uF - $18 ea. 5.7uF - $31 ea. 6.2uF - $31 ea. 20uF - $85 ea. $189 x 2 {two channels} = $378 for elite capacitors. I'm sure if you look hard you can get non-name brands for 1/2 that price, still it's almost $200 just for these caps. Metalized Poly 1uF - $1 ea. 2uF - $1.5 ea. 3.2uF - $1.75 ea. 5.7uF - $2 ea. 6.2uF - $2.15 ea. 20uF - $5 ea. Much better. $13.40 x 2 {two channels} = $26.8 Coils; 100uH - $2 200uH - $2.5 390uH - $5 1.7mH - $18 Coils - $27.5 x 2 {two channels} = $55 Resistors are cheap so I won't go there. *Elite capacitor plus coil cost = $433 *Good capacitor plus coil cost = $81 /// If you spend all that time making elite crossover design and used electrolytic capacitors, you should be spanked. If you used metalized poly caps driver cost will be $81 + resistor cost + shipping, over $100. If you feel like you want the elite crossover parts you will spend over $450. If this is a DIY venture, the $250 digital crossover sounds pretty good as it can be used over and over again for future builds assuming you don't use your previous builds. You can also make a passive crossover for your previous build if you wanted to use that loudspeaker or have plans to sell it. If you have plans to sell it, then make a cheap passive crossover. But if you like to DIY speakers the active system pays for itself in no time. The big bonus with active; You can create different sounds from a single design. The passive version is fixed, you can't change component values, crossover slopes, adjust frequency, add delays, etc etc etc.. without designing a whole new passive crossover. [/QUOTE]
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