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New crossover/impedance

 
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WildIowa



Joined: 06 Mar 2004
Posts: 490
Location: Henderson IA

PostPosted: Mon Mar 27, 2017 10:52 am    Post subject: New crossover/impedance Reply with quote

I have to replace an old crossover in a Carvin monitor. I can get one at Parts Express at the right crossover point but they are all intended for for 8 ohm speakers. The driver in the Carvin is 16 ohms. What happens with this mismatch? Just wondering. I don't think a replacement is available from Carvin. Thanks. IA
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BrightKJ



Joined: 13 Sep 2008
Posts: 342
Location: Midlothian, VA

PostPosted: Mon Mar 27, 2017 11:22 am    Post subject: Reply with quote

If they aren't already, you could always rewire pairs of them in parallel. In parallel, two 16 ohm speakers look like 8 ohms.

Parallel Resistance = (R1*R2)/(R1+R2)
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WildIowa



Joined: 06 Mar 2004
Posts: 490
Location: Henderson IA

PostPosted: Mon Mar 27, 2017 12:17 pm    Post subject: Reply with quote

An update...a guy at Simply Speakers says using a 16 ohm load on a crossover rated at 8 ohms will cut the crossover point in half...so, my 3k crossover, which I want, would become 1.5k. Which could blow the driver if it can't handle the lower crossover point. I am asking them if I should then get a 5 to 6k crossover and use the 16 ohm load on the 8 ohm crossover...giving me an equivalent of about 3k...does that make sense? I hope so...
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BrightKJ



Joined: 13 Sep 2008
Posts: 342
Location: Midlothian, VA

PostPosted: Mon Mar 27, 2017 12:34 pm    Post subject: Reply with quote

I would still check the wiring of the speakers inside the cabinet. Solder is cheap and you won't be overloading anything.
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RolandR



Joined: 03 Sep 2003
Posts: 8908
Location: Coastal Calif.

PostPosted: Fri Mar 31, 2017 2:14 pm    Post subject: Reply with quote

I used to buid passive crossovers. Which driver is 16 ohms? I assumes it's is the hi-frequency driver which is quite common.

Below is a diagram of a two-way crossover.


So you could build your own. Here's a link to calculate the capacitors and inductors to be used:
https://www.diyaudioandvideo.com/Calculator/SpeakerCrossover/

I suggest 2nd Order Linkwitz-Riley.

A second order crossover is commonly used, 12 dB/oct slope, good enough for tweeter protection. Any higher order, you then need precise tolerance components then it gets even more complicate because just because a driver is an 8 ohm load at say 3k Hz it may be a different impedance like anywhere from 6 ohms or 14 ohms. So stay with second order.

Have fun! Wink
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