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Old 16th September 2012, 12:05 AM   #1
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Default Wiring two speakers in parallel, off a premade crossover?

If I have a premade set of car audio splits (midwoofer and tweeter) with a suitable crossover, what happens if I wire two midwoofers in parallel off the same crossover?

does the crossover point for the midwoofer rise? or drop?

thanks.
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Old 16th September 2012, 12:14 AM   #2
tvrgeek is offline tvrgeek  United States
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Instead of an easy answer, I recommend you search the web for a crossover designer. Plug in some values and see what happens.

Remember, you are only messing up half the crossover. Think about what that will do if the woofer crossover point changes but the tweeter does not.
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Old 16th September 2012, 12:15 AM   #3
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In theory, halving the impedance will cause the crossover point to drop 1 octave, but the tweeter will stay the same, causing a huge hole in FR.
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Last edited by Melo theory; 16th September 2012 at 12:18 AM.
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Old 16th September 2012, 12:40 AM   #4
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hmm..
might run the second midwoofer full range for now
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Old 16th September 2012, 01:04 AM   #5
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What order is the XO?
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Old 16th September 2012, 01:05 AM   #6
tvrgeek is offline tvrgeek  United States
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And you might find out how horrible driver breakup is.

Darn Melo, I was trying to get him started off right.
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Old 16th September 2012, 01:08 AM   #7
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It's 12dB per octave.

I was planning to build a proper crossover in future, as I don't want to use the tweeters that came with the splits anyway.

But for now, I think I'll leave the splits as is, and just run the extra midwoofer full range
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Old 16th September 2012, 01:18 AM   #8
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Quote:
Originally Posted by tvrgeek View Post
And you might find out how horrible driver breakup is.

Darn Melo, I was trying to get him started off right.
I was just answering his question.
Golly gosh darnit
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Old 16th September 2012, 04:00 AM   #9
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Quote:
Originally Posted by Melo theory View Post
causing a huge hole in FR.
Ya, as I reckon, the coil does more and the cap does less as the impedance drops so it's a rolled off sort of hole but still a big hole.
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Old 16th September 2012, 04:38 AM   #10
Pano is offline Pano  United States
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I think you would end up with a low pass similar to a 1st order at 1/4 the frequency. Depending on the crossover and the driver impedance curve.

Chart below shows a 2nd order L/R low pass (purple) and the same values with 1/2 the load (blue). Very dependent on impedance, of course.
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