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Just a quick question. Is there anything wrong with running 4 speakers on one passive crossover network?

For example, a single amp channel out to a passive network with two 6.5 hooked up to the woofer side, and 2 tweeters hooked up to the tweeter output side.

Im sure it'd be fine. Just never done it. With the ohm load at 2ohms out from the amp. Is there a risk of thermal issues on the XO?
 

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the crossovers are designed for the ohm rating of the speaker. Adding another speaker halves it and changes the crossover value.
 

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The issue you have as said is a passives crossover frequency changes with load, so realistically you would need a second passive, remove the tweeter section and parallel the midbass section with the other complete crossover
 

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as others stated, it will change the xvoer point in the passive. to run 2 sets of speakers you are more than likely wiring them up as parrallel so you would see a 2 ohm load. The amp will be fine, the speakers may not like the changed xover point especially if you are using the passive that came with the set. Especially with tweeters, it can lower the xover point and thats an easy way to kill a tweeter. Tying to play lower than they like.
 

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An active crossover sort of is the 60s solution.

What is the reasoning behind to wanting to run multiple speakers?
 
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