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Old 11-26-2017, 10:02 PM
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Default Sub Firing Directions

I am currently designing my system for 4 american bass xfl 12's powered by two saz3000d's in my chevy avalanche. I'm trying to do something quite a bit different than I have in the past. Because of this, I want to have 2 subs normally mounted and 2 inverted.

I've got two basic questions:
1. When I have some subs mounted normal, and some subs inverted, do I wire them inversely as well to make sure that the direction of the sub is moving in the same?
2. Is there a problem with firing subs at an angle from one another? (see picture below)

Please note that I am not even remotely close to being done designing, this is purely just my starting point I have thrown together.

Whats your input on the fundamentals?
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File Type: jpg Sub Box 1.jpg (10.3 KB, 29 views)
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Old 11-28-2017, 12:19 AM
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1) Yes, that's correct. You can test the way the subs will "move" by using a 9v battery quickly connected to the sub wires. You only need to connect it for a second. If the cone moves "out" the wire touching the + terminal on the battery should be on the + terminal on the amp. Make sure they all move "out" and they will all be wired with the correct polarity.

2) No, there's no problem with angling the subs.
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Old 12-01-2017, 07:36 AM
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Thanks for the feedback.

In addition, I want to ensure that putting the subs near the end of the port as shown is going to cause any unwanted noises?
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Old 12-01-2017, 10:22 PM
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Are the angled subs in the mouth of the port? If so that's fine. I assume the port extends down into the box and the subs are just at the flared mouth. There will be slight loading effects, but that close to the terminus and with the expanding profile it shouldn't change much. If anything it will have a positive effect. Lots of SPL guys from 15-20 years ago used folded designs like that.
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