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Multi-Way Conventional loudspeakers with crossovers

Crossover for 2 way with 4 woofers?
Crossover for 2 way with 4 woofers?
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Old 25th September 2019, 04:28 PM   #1
thought is offline thought  United States
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Default Crossover for 2 way with 4 woofers?

Hello folks. This is my first post of diyaudio, about what should be my first pair of speakers. I'm trying to make a 2 way, with one tweeter and 4 woofers. My only idea is to run them all in parallel, but wouldn't that lower the impedance to unsafe levels?
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Old 25th September 2019, 04:35 PM   #2
Lojzek is offline Lojzek  Croatia
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Hi and welcome! Post as much details as you can so the members can offer a better overall advice.
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Old 25th September 2019, 04:37 PM   #3
rayma is offline rayma  United States
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Quote:
Originally Posted by thought View Post
Hello folks. This is my first post of diyaudio, about what should be my first pair of speakers. I'm trying to make a 2 way, with one tweeter and 4 woofers. My only idea is to run them all in parallel, but wouldn't that lower the impedance to unsafe levels?
Yes, instead connect them in series-parallel, wired like a figure 8.
Then the total impedance seen by the amp is the same as that of a single woofer.
The woofer positive terminals all go towards the positive amp terminal.
Similar to this: https://www.allaboutcircuits.com/upl...n-circuits.jpg

Last edited by rayma; 25th September 2019 at 04:45 PM.
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Old 25th September 2019, 05:24 PM   #4
thought is offline thought  United States
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Quote:
Originally Posted by rayma View Post
Yes, instead connect them in series-parallel, wired like a figure 8.
Then the total impedance seen by the amp is the same as that of a single woofer.
The woofer positive terminals all go towards the positive amp terminal.
Similar to this: https://www.allaboutcircuits.com/upl...n-circuits.jpg
In this configuration, would I just go ahead with a normal 2 way crossover?
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Old 25th September 2019, 08:53 PM   #5
Galu is offline Galu  Scotland
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Quote:
Originally Posted by thought View Post
In this configuration, would I just go ahead with a normal 2 way crossover?
Yes, simply treat the series/parallel woofer combination as a single woofer.

The attachment shows the simplest possible arrangement, but you'll be wanting a more sophisticated crossover.

P.S. Disregard the 'Out' connection, this only applies to a PA cabinet!
Attached Images
File Type: png adding a tweeter.png (4.0 KB, 96 views)

Last edited by Galu; 25th September 2019 at 08:58 PM. Reason: Added the P.S.
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Old 25th September 2019, 08:57 PM   #6
rayma is offline rayma  United States
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Quote:
Originally Posted by Galu View Post
Yes, simply treat the series/parallel woofer combination as a single woofer. The attachment shows the simplest possible arrangement, but you'll be wanting a more sophisticated crossover.
Yes, but do use the jumper between the centers of the two woofer strings.
I think you'll find that it sounds better that way than without it.
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Old 25th September 2019, 09:22 PM   #7
Galu is offline Galu  Scotland
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Hi Rayma!

Your wiring is parallel/series while mine is series/parallel.

Is there really a difference soundwise?
Attached Images
File Type: gif parallel.series.gif (1.0 KB, 91 views)
File Type: gif series.parallel.gif (934 Bytes, 90 views)
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Old 25th September 2019, 09:28 PM   #8
rayma is offline rayma  United States
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Quote:
Originally Posted by Galu View Post
Hi Rayma!
Your wiring is parallel/series while mine is series/parallel.
Is there really a difference soundwise?
Yes, think about the Thevenin source impedance that each 8R woofer sees with a low Zo amp.
Without the jumper, each woofer sees 8R. With the jumper, each woofer sees 8/3 R.
It makes a difference (an improvement) in the sound. This also works for multiple FR or tweeters.

Last edited by rayma; 25th September 2019 at 09:34 PM.
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Old 25th September 2019, 09:43 PM   #9
Cal Weldon is offline Cal Weldon  Canada
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Crossover for 2 way with 4 woofers?
So, what's the best option if a woofer(s) blows and goes short circuit? Which schem is safer for the amp? I think the poster needs to know gents.
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Old 25th September 2019, 09:57 PM   #10
Galu is offline Galu  Scotland
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Isn't a driver more likely to fail open circuit?

If we assume 8 ohm drivers and one fails short circuit, then the difference in load terms is small: 4 ohm versus 5.3 ohm.
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