The only pic I have is inconclusive on the pipe. I don't see it though.
JBL Subwoofer Box (1 Viewer)
- Thread starter alwaysme
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- #22
Yes, are they supposed to be connected? Does anyone know? I also started cutting and its not as simple as i thought. Ill come back later once im done.
Pretty sure those are the sunroof drains. Looks like from this pictures it possibly does. From this post
Maybe it seperated while you were taking it apart. I would suspect you'd have quite a bit of water in the rear cabin if it was dislodged, unless you never drive/park in rain.
I can’t however if you reverse them the worst case should be that the sub is out of phase. If you have a decent ear you’ll be able to tell because the bass will sound hollow, especially around the crossover frequencies
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- #30
Ok i can confirm 100% that the terminal labels are reversed and incorrect. This is insane how did toyota overlook this? Could it be on purpose and the amp is adjusting for this somehow? The + terminal is behaving as negative and vice
Now wondering whether i should wire according to toyotas labels or wire it the "correct" way
Now wondering whether i should wire according to toyotas labels or wire it the "correct" way
There isn’t necessarily a right way. It may be that Toyota found the system to be in better phase with the outputs reversed. Speakers with analog crossovers (home theater and the like) have single drivers in a system wired to the opposite polarization all the time because for mechanical or electrical reasons that puts that driver in better phase. Home theater subwoofers regularly come with a phase reversal switch for exactly this purpose, because depending on where the woofer gets placed in the room it may sound better one way or the other.Ok i can confirm 100% that the terminal labels are reversed and incorrect. This is insane how did toyota overlook this? Could it be on purpose and the amp is adjusting for this somehow? The + terminal is behaving as negative and vice
Now wondering whether i should wire according to toyotas labels or wire it the "correct" way
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- #32
Ok thanks for letting me know, it seems you are experienced in audio. If you were to wire a new "smaller" sub to your LC system, would you reverse the terminals? I just did another test and the OEM sub flexes "inwards" when i send 12v to the positive terminal and outwards to the negative. It just feels wrong and I am unable to distinguish if music sounds better with them reversed or not
If you can’t tell the difference, then it doesn’t matter. Music signal is not a DC current so the battery test doesn’t mean much. The speaker plays just as loud whichever way you wired it, just 180 degrees out of phase. If you wanted to get crazy with it, you’d need a microphone and audio analyzer software and figure out which wiring made for the best signal response. but it goes back to, if you can’t hear a difference, then there isn’t a difference. Honestly, the front woofers probably dominate the bass response now that you have shrunk the woofer so much.
Nice work. I don't think i saw what model subwoofer you bought. But now that you have 2 that might give you some flexibility in the way you wire them so that you get a better impedance match with what the OEM sub was.
This all seems like a lot of work…
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- #37
Do you suggest I have one reversed and the other following the standard? Or its best to have both connected the same way whether inverted or not?
I suggest mounting the two separate woofers in phase with each other (so they are on the same downstroke/upstroke together). For the phase with the rest of the system, try both ways and see which is better.
Like @grinchy says, definitely in phase with each other.,. and like he said, wouldn’t be a bad idea retest which phase as a unit sounds better since you probably increased the overall volume.
Are you wiring the speakers in series or parallel? If you could get to a 2ohm load that would probably be ideal. If your speakers are 4ohm you will want to wire them in parallel and that will give you 2ohm.
