Troubleshooting Cancellation in my 09 Jetta.

CaptainPioneer · Post by **CaptainPioneer** » Tue Aug 17, 2010 5:11 am

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.

Bwcad1 · Post by **Bwcad1** » Tue Aug 17, 2010 5:26 am

How do you know your getting cancellation? Whats wrong with it?

Bwcad1 · Post by **Bwcad1** » Tue Aug 17, 2010 5:27 am

Also im almost positive they didn't make a 1600w 2 channel Brutus. Whats the model number of the amp you have?

Ryan from Ohio · Post by **Ryan from Ohio** » Tue Aug 17, 2010 7:04 am

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.

scotts1000rr · Post by **scotts1000rr** » Tue Aug 17, 2010 7:33 am

Are they facing back or forwards?

Bwcad1 · Post by **Bwcad1** » Tue Aug 17, 2010 7:36 am

scotts1000rr wrote:Are they facing back or forwards?

Subwoofers are downfired with 1.5" of space between the subs and the floor

CaptainPioneer · Post by **CaptainPioneer** » Tue Aug 17, 2010 8:37 am

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

Ryan from Ohio · Post by **Ryan from Ohio** » Tue Aug 17, 2010 8:49 am

I cant say Ive ever had any luck with firing subs down.

Bwcad1 · Post by **Bwcad1** » Tue Aug 17, 2010 8:52 am

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.

CaptainPioneer · Post by **CaptainPioneer** » Tue Aug 17, 2010 9:09 am

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.