Capacitor as a crossover? - diyAudio
 Capacitor as a crossover?
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 31st March 2014, 07:05 PM #1 diyAudio Member   Join Date: Feb 2014 Capacitor as a crossover? Hi. I'm making a similar system to the one in this thread Transmissionline Ipod Docking Station I have the same Peerless drivers and a couple of cheap tweeters. The guy in the Transmissionline build says he just used a capacitor as a crossover. How can I tell which capacitor to use and how it's wired? Thanks for any replies. Adri
 31st March 2014, 07:31 PM #2 diyAudio Member     Join Date: Feb 2014 Location: No idea .. that guy crossed the tweeter around 10 Khz ... so for a first order crossover the formula is C=0.159/(i*f) i = impedance of the tweeter at the crossover point (if don't have it use nominal impedance) f= Crossover frequency Or use a crossover calculator xD __________________ Sorry for my horrible English Last edited by lexer98; 31st March 2014 at 07:36 PM.
 31st March 2014, 09:17 PM #3 diyAudio Member   Join Date: Feb 2014 So where would the capacitor wire to? Thx
 31st March 2014, 09:44 PM #4 diyAudio Member   Join Date: Aug 2002 Location: victoria BC for a simple 1st order, in series with the + tweeter terminal (even though the filter components are in series with the respective drivers, this is referred to as a parallel network, as the drivers are in parallel with each other) a basic on-line X-O calculator would return a diagram as below, as well as provide value for C: when using a FR wide open, ignore the L1 LP filter leg __________________ now on sabbatical
 31st March 2014, 10:00 PM #5 diyAudio Member   Join Date: Feb 2014 Thx v much all! So all I need is a capacitor for each tweeter. I guess it'd be about right to go for the 10000 hz as per the transmissionline project I've referred to as he used the same peerless full range drivers so I'm just going for the very high frequencies to go through the tweeters. Think I'm beginning to understand... Thx again Adri
 31st March 2014, 10:09 PM #6 diyAudio Member   Join Date: Sep 2004 Location: Minneapolis, Minnesota, USA Another thing to consider is the relative efficiencies (loudness) of the drivers. The tweeter usually will usually have a higher SPL (sound pressure level) than a mid or woofer, so you will normally need to pad down the tweeter with a "L" pad or equivalent resistors to match levels. Mike
 1st April 2014, 12:42 AM #7 diyAudio Member   Join Date: Feb 2011 Location: Columbus Ohio Crossover Design Chart and Inductance vs. Frequency Calculator(Low-pass) have fun 1 capacitor is a 6db crossover so say for example 2uf @ 8 ohms 10,000hz 5000hz would be 6db quieter at 2500hz it would be 12 db quieter 1250hz 18db 625hz 24db. I think that is correct. Many speakers do cross over tweeters that high, some of the old tube consoles I saw used a 1uf cap at tweeters. __________________ I know nothing, so learning is really awesome.

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