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post #1 of 6 Old 07-12-2014, 03:28 PM - Thread Starter
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Identify this component's value and more. Xover related.

I picked up a cheap bookshelf system LG CM4530 and decided to do some modding. I tore open the cabinets and applied some sonic barrier 3 layer foam. They really needed it. Now I'm thinking about replacing the drivers (I know..I want to play and learn...) with the Silver Flute W17RC38-04 6.5" 4 ohm woofers and maybe using passive crossovers to help improve the sound(Tweeters later if needed).
The pic is showing a 100uf cap yes? Assuming the tweeter is also 4 ohms does that mean it's functioning as a 398Hz filter? That's a high pass right? Filtering >398Hz to the tweeter?


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post #2 of 6 Old 07-12-2014, 04:39 PM
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That's a 1.8uF 5% cap.

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post #3 of 6 Old 07-12-2014, 04:47 PM - Thread Starter
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Originally Posted by Bill Fitzmaurice View Post
That's a 1.8uF 5% cap.
Hmm. Using the Electronics Assistant Cap code converter (From Electronics2000.co.uk) gives me 100uF at +/- 5%. ???

Wouldn't 1.8uF give me a crossover frequency of 11K Hz? The tweeter would have to be 8 ohms since a 4 ohm tweeter would net 22.1k Hz X over. Does that sound right? (4 ohm woofer)

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post #4 of 6 Old 07-12-2014, 04:55 PM
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Originally Posted by Scottyman View Post
Wouldn't that give me a crossover frequency of 11K Hz? The tweeter would have to be 8 ohms since a 4 ohm tweeter would net 22.1k Hz X over. Does that sound right?
It's common for inexpensive systems to use a first order filter at a very high frequency to provide adequate driver protection.

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post #5 of 6 Old 07-12-2014, 05:52 PM - Thread Starter
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Originally Posted by Bill Fitzmaurice View Post
It's common for inexpensive systems to use a first order filter at a very high frequency to provide adequate driver protection.
Even if I just replaced the filter with a 2 way crossover passive design it should in theory improve the sound quality? Ex. Dayton Audio 2.5K 2 Way Crossover. It's got to be better than my current 6.5" woofers handling everything up to 11K Hz.

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post #6 of 6 Old 07-12-2014, 06:15 PM
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Even if I just replaced the filter with a 2 way crossover passive design it should in theory improve the sound quality?
It absolutely will if the crossover is properly designed to work with the drivers, but that's never the case with generic off the shelf crossovers. About the best you can say about them is that they work better than no crossover.

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