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How do I test resistance of speaker??

post #1 of 5
3/8/11 at 3:49pm
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Hello. I just got 7 BIC America LH6 center channels (2 6 inch and a horn). They are super efficient but tooooo exagerated in the mid to high section IMO (between 2K to 5K), do not like that range. I want to change the X-over and cut at 5K to the horn and I thing it will sound sweet. I just ordered two high pass crossovers fro Parts express rated at 8 ohm. How do I know the ohm resistance value of each component inside the speaker. (there are 2 6 inch woofers and the horn). The total is 8ohm. Does it matter is the xover is 8 or 4 ohm?. confused here. Thanks for your help. I want to hear your opinion thanks
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post #2 of 5
3/8/11 at 4:06pm
1. It does matter because the frequency will be off by as much as an octave if you use a network intended for 8ohms with drivers of 4ohms (or 16ohms).

2. But it is worse: The measured DC resistance is not what you need to know. You need to know the AC impedance in the crossover frequency range. You can measure the former with a multimeter but the latter requires an audio frequency measurement system as you will have to measure over the crossover frequency range.

3. Still worse: Because of the former and other factors, off-the-shelf crossovers are rarely effective and I doubt that replacing yours with this one is worth the bother.

You need to learn how crossovers work and then, perhaps, you can modify the one you have.
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post #3 of 5
3/10/11 at 1:14am
Quote:
Originally Posted by jdosramos View Post

Hello. I just got 7 BIC America LH6 center channels (2 6 inch and a horn). They are super efficient but tooooo exagerated in the mid to high section IMO (between 2K to 5K), do not like that range. I want to change the X-over and cut at 5K to the horn and I thing it will sound sweet. I just ordered two high pass crossovers fro Parts express rated at 8 ohm.

If you want to cut high frequencies, try adding 4-8 ohm resistor in series with one tweeter terminal. Should be a power resistor once you determine the value.

Even before that, just put your hand over the tweeter to confirm that the offending frequencies are coming from there.
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post #4 of 5
3/10/11 at 5:13am
Quote:
Originally Posted by Roger Dressler View Post

If you want to cut high frequencies, try adding 4-8 ohm resistor in series with one tweeter terminal. Should be a power resistor once you determine the value.

Even before that, just put your hand over the tweeter to confirm that the offending frequencies are coming from there.

+1, try a simple resistor 1st.
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post #5 of 5
3/10/11 at 5:43am
L-Pad, maybe? Give yourself some adjustability.
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