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Troubleshooting Cancellation in my 09 Jetta.
Posted: Tue Aug 17, 2010 5:11 am
by CaptainPioneer
Hi guys, I finally threw in my LOC last night to get the subs getting source from the stock radio. No problems there... However I am having some serious issues with cancellation in the trunk. I've never had this problem before on my other installs. Here are the specifics... 2 12" Autotek SM12 D4's in a 1.2 cuft sealed box with no wall open chamber. Recommended airspace sealed was .5 cuft sealed per the Autotek website. Subwoofers are downfired with 1.5" of space between the subs and the floor Driven by a Hifonics Brutus 1600w 2ch amp Placement is as far up in the trunk as possible to where the seats fold down. I am thinking I might have to move the subs to the back of the trunk where the lid opens and possibly aim them toward the seats... Any help would be great... Thanks.
Posted: Tue Aug 17, 2010 5:26 am
by Bwcad1
How do you know your getting cancellation? Whats wrong with it?
Posted: Tue Aug 17, 2010 5:27 am
by Bwcad1
Also im almost positive they didn't make a 1600w 2 channel Brutus. Whats the model number of the amp you have?
Posted: Tue Aug 17, 2010 7:04 am
by Ryan from Ohio
I would play with box placement. Try aiming to the back pushed all the way back. Almost always yielded best results for me with sealed boxes.
Posted: Tue Aug 17, 2010 7:33 am
by scotts1000rr
Are they facing back or forwards?
Posted: Tue Aug 17, 2010 7:36 am
by Bwcad1
scotts1000rr wrote:Are they facing back or forwards?
Subwoofers are downfired with 1.5" of space between the subs and the floor
Posted: Tue Aug 17, 2010 8:37 am
by CaptainPioneer
Bill,
I am pretty sure I am getting cancellation... Sound is greatly amplified when the trunk is open... when it is closed its night and day...
and yes... they are facing down lol
Posted: Tue Aug 17, 2010 8:49 am
by Ryan from Ohio
I cant say Ive ever had any luck with firing subs down.
Posted: Tue Aug 17, 2010 8:52 am
by Bwcad1
CaptainPioneer wrote:Bill,
I am pretty sure I am getting cancellation... Sound is greatly amplified when the trunk is open... when it is closed its night and day...
and yes... they are facing down lol
Well what amp do you have first of all. Im willing to be its a mono not 2 channel.
As far as when you close the trunk have you tried opening the windows ? bet you get the same result. Your car is probably just sealed very well much like my Buick. Same thing happens with mine. Crack a window huge bass response close it up gets quiet again. And this is forward firing with a sealed wall so no chance of cancellation.
Posted: Tue Aug 17, 2010 9:09 am
by CaptainPioneer
Bill, I stand corrected... it is the monoblock hifonics Brutus 1605D...
Even when I crack the windows down it does not make a huge difference... not like when i have the trunk open...
I will see what I can do with positioning and not down firing... Its too bad since I really wanted this to be a down fire installation.