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Old 31st March 2014, 06:05 PM   #1
adri123 is offline adri123  United Kingdom
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Default 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
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Old 31st March 2014, 06:31 PM   #2
lexer98 is offline lexer98  Argentina
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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
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Last edited by lexer98; 31st March 2014 at 06:36 PM.
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Old 31st March 2014, 08:17 PM   #3
adri123 is offline adri123  United Kingdom
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So where would the capacitor wire to?

Thx
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Old 31st March 2014, 08:44 PM   #4
chrisb is online now chrisb  Canada
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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:



Click the image to open in full size.

when using a FR wide open, ignore the L1 LP filter leg
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Old 31st March 2014, 09:00 PM   #5
adri123 is offline adri123  United Kingdom
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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
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Old 31st March 2014, 09:09 PM   #6
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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
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Old 31st March 2014, 11:42 PM   #7
Jsixis is offline Jsixis  United States
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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.
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