Fusion 8 Alchemy Crossover Help? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 7 Old 09-07-2017, 01:37 PM - Thread Starter
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Fusion 8 Alchemy Crossover Help?

I'm building a Fusion 8 Alchemy center speaker and was hoping for some confirmation on the crossover before I started gluing and soldering. I've done some Google-learning and came up with the following diagram to help me visualize how to lay out the components on the board. I've intentionally obscured/altered aspects of the crossover in order to respect the designer, but I think it should be enough to see what I'm trying to do.

I have two main questions. First, is it okay to have all negative leads tie back to a common point like I've drawn? Also, the woofers are to be run in parallel. To do this can I simply run jumper wires from the positive input on the first woofer to the positive on the second one? And same for the negatives?

Thanks for your feedback!
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post #2 of 7 Old 09-07-2017, 03:10 PM
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Check the official forum threads over at diysg...they have pictures of the completed boards
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post #3 of 7 Old 09-07-2017, 04:12 PM - Thread Starter
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Thanks, Robo. It looks like all the images in that forum are broken. Erich actually suggested I reach out to this community for confirmation. I think I have the layout mostly sorted out, I just wasn't sure about how I had the negative leads connected and the parallel woofers.
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post #4 of 7 Old 09-07-2017, 09:07 PM
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As long as you add in the missing capacitor and resistor from your drawing in the correct locations then yes that would be the correct way to wire everything up, negatives do get all tied together like that. You can use jumpers between the two woofers or run wires for the second woofer from the crossover itself.
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post #5 of 7 Old 09-07-2017, 09:32 PM - Thread Starter
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Sweet! Thanks for the clarification, mtg, I appreciate it.
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post #6 of 7 Old 09-09-2017, 05:34 AM
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Quote:
Originally Posted by mtg90 View Post
negatives do get all tied together like that
Side question: are there some types of crossovers where the negatives do take separate paths?

Thanks.
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post #7 of 7 Old 09-09-2017, 08:44 PM
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Not on most parallel crossovers which is the most common implementation for speakers. Though technically you should be able to could reverse the entire filter so that the positives are all tied together and the components are placed inline on the negative path and you should end up with the same results.

Series crossovers are a bit more confusing when it comes to wiring as like the name hints the drivers are tied in series as are the crossover filters and there is no common negative.

Random example of a series crossover:
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