bass gets louder when the trunk is open

[noble brown]

i recently bought a 07 lucerne and installed a new hu a jvc, old crunch gpv1000.1 and 2 12" sonys, plus a SSL crossover. i noticed off the bat the bass wasnt hittin like it did in my 99 taurus. no big deal i chalked it up to the new trunk size and new acoustics. it sounds clean and all just not as punchy. but then i opened the trunk from the inside and i noticed distinct and measurable increase in the bass. not something i would attribute readily to just a change in the trunk space w the trunk lid open. it sounds electrical... im not really sure how else to explain it. its just to great of a change in sound. it starts sounding like it used to in the taurus. now i remember one time i installed a system that hummed when the the trunk was opened, it boiled down to a bad ground, i wonder if this is similisr. i will check to see if there is a visible difference in excursion when the trunk open tommorrow. anyone ever come across this before?

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[FamousMassacre 10+ year member]

What kind of box?

 

[kramer_212 10+ year member]

which way are the woofers facing?

 

[noble brown]

they're in sealed boxes and facing forward all the way up against the back seat. this was the same in the taurus.

 

[tc300 10+ year member]

Trunk may be sealed...?.

 

[FamousMassacre 10+ year member]

they're in sealed boxes and facing forward all the way up against the back seat. this was the same in the taurus.

Face them towards the trunk, right up on it so it's like 2 inches away.

 

[AnthonyO 10+ year member]

Facing them forward in that big *** trunk of the Lucerne without sealing it to the cabin, I can guarantee its canceling. Turn the subs to the rear.

 

[keep_hope_alive Premium Member]

yep, cancellation at work. sound leaving the subs travels in all directions. when it hits a hard surface it reflects back. when those reflections are 1/4 wavelength away, the returning sound is 1/2 wavelength delayed and you get pure cancellation. anything else is partial cancellation.

fire rear close to the rear and the trunk lid reflection will be close enough to not cause cancellation in sub frequencies.

or fire forward and seal the front baffle off at the opening.

in general, you want to rear- and/or corner-load the sub and port.

 

[radwilsons5803 10+ year member]

Cancellation like the previous members said, face them to the rear

 

[BrownVanMan 10+ year member]

not trying to thread jack but my buddy had a similar issue with his 01 tarus but we had 2 12s ported facing rear and once you closed the trunk you could barly hear the bass. open trunk and it was niceee. i though maybe it was box rise but other trunk systems set up similarly didnt do this?

 

[keep_hope_alive Premium Member]

not trying to thread jack but my buddy had a similar issue with his 01 tarus but we had 2 12s ported facing rear and once you closed the trunk you could barly hear the bass. open trunk and it was niceee. i though maybe it was box rise but other trunk systems set up similarly didnt do this?

depends how far rear. most push them to the back of the rear seat - which means you have a delay for the reflection. rear meaning close to the rear of the vehicle is different than rear at the back seats.

 

[noble brown]

hey thanks everyone. you were all right. i tried a few spots out and the best sounding was to the rear of the trunk facing forward.