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Amp phase control switch


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90s civ and sub 
Member - Posts: 22
Member spacespace
Joined: December 31, 2006
Location: United States
Posted: January 18, 2007 at 10:25 AM / IP Logged  

Well, I've searched past threads and have found no difinitive answers, which brings me to the 12volt's "Think tank".

What does a phase control switch on the amp do?  Does it simply reverse polarity of speaker leads, electronically, or can it be used to help remedy phase cancellation problems (i.e. ports on an opposite plane from the sub, sub positioning cancellation problems etc).

I'm trying to determine the positioning of my sub box in relation to the tailgate of my Suburban.  I've heard and read that facing the subs toward the tailgate, with the enclosure "close" (no closer than 1 port width) to the tailgate offers the best, in-vehicle bass, with minimal cancellation vs. the same enclosure positioned at the back of my 3rd row seat (apx 2' away from the tailgate).  Thanks in advance, gents.  Any help will be appreciated.

90 Civic DX Hatchback- 135 amp alternator
92 Suburban - 200 amp alternator
Stereo rebirth, coming soon. . . .
swerve 
Copper - Posts: 149
Copper spacespace
Joined: January 10, 2007
Location: Oregon, United States
Posted: January 18, 2007 at 10:49 AM / IP Logged  
if it is just a switch it should reverse the polarity, if it is a pot then it acts kinda like an adjustable delay so you can adjust up to 180 degrees of the waveform, this would allow to combat slight cancellation problems but not poor placement or design of your box
git yer swerve on!
stevdart 
Platinum - Posts: 5,816
Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member consistently provides reliable informationspace
Joined: January 24, 2004
Location: Pennsylvania, United States
Posted: January 18, 2007 at 10:19 PM / IP Logged  
I agree. Good answer, swerve. The switch in question simply reverses polarity, but that reversal of polarity CAN help remedy cancellation problems with other speakers in your system. For example, the fronts mids which share some higher sub/lower mid cycles with the sub. But as swerve said, it won't fix design deficencies within the sub itself.
If you can possibly design your box so that you have placement options, do so. Experimentation of placement is the key to success in every install.
And to add: EVERY sub should be tried with the switch in both polarities after final positioning. One will sound better than the other to the person in the driver's seat, so use that position.
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
90s civ and sub 
Member - Posts: 22
Member spacespace
Joined: December 31, 2006
Location: United States
Posted: January 19, 2007 at 11:05 AM / IP Logged  
Thanks for the help, guys!
90 Civic DX Hatchback- 135 amp alternator
92 Suburban - 200 amp alternator
Stereo rebirth, coming soon. . . .

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