Subs not hitting as hard as i want


kaleb.n.willis

CarAudio.com Newbie
Apr 5, 2021
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Kansas City
I have a pair of Rockford Fosgate P3D4-12's wired @1ohm on a Skar RP-2000.1D. Theyre in a ported Fosgate box in my trunk, my trunk is 12 cubic feet, it barely fits in there. My dad has the same set up but with a Fosgate 1500 in a bigger trunk. His subs hit loads harder than mine, im trying to understand if his amp is just that much better than mine, I know Fosgate is better than Skar, but it's a HUGE difference, or idk if his extra trunk space is the reason. My subs move more than his, but with his you can feel much deeper and fuller bass. I've tinkered with just about every filter and setting I can, I can't even try to get them to hit the same, but im also not trying to spend 1,000 on an amp just for deeper bass. Just wondering if someone knows a reason I can't think of, I keep thinking it's the larger trunk and cabin space, but he swears it's the amp, any feedback will be appreciated
 
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shredder2

CarAudio.com Elite VIP
Nov 19, 2017
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I have a pair of Rockford Fosgate P3D4-12's wired @1ohm on a Skar RP-2000.1D. Theyre in a ported Fosgate box in my trunk, my trunk is 12 cubic feet, it barely fits in there. My dad has the same set up but with a Fosgate 1500 in a bigger trunk. His subs hit loads harder than mine, im trying to understand if his amp is just that much better than mine, I know Fosgate is better than Skar, but it's a HUGE difference, or idk if his extra trunk space is the reason. My subs move more than his, but with his you can feel much deeper and fuller bass. I've tinkered with just about every filter and setting I can, I can't even try to get them to hit the same, but im also not trying to spend 1,000 on an amp just for deeper bass. Just wondering if someone knows a reason I can't think of, I keep thinking it's the larger trunk and cabin space, but he swears it's the amp, any feedback will be appreciated
Those Bdcp T series amps kick ass 1st off but a 2K in the "same setup" should be close.

Are the enclosures identical too? Same vehicle? more info would help
 

Clifff150

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Jan 10, 2012
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Prefab Rockford boxes are tuned super high. The BDCP’s really are nice amps and yes better than the Skar but power shouldn’t be the problem.
 

kaleb.n.willis

CarAudio.com Newbie
Apr 5, 2021
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Kansas City
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Those Bdcp T series amps kick ass 1st off but a 2K in the "same setup" should be close.

Are the enclosures identical too? Same vehicle? more info would help
I've got a 2006 G6 coupe, he's got a 2014 Cruze sedan. He's also got some prefab dual 12" ported cheapo box from Amazon
 

shredder2

CarAudio.com Elite VIP
Nov 19, 2017
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If everything is basically equal and your subs are moving more but his is much louder.
Possibly the 2 subs are out of phase?
You can't visually tell by watching them play music normally. Remove the speaker wire at the amp and test the subs phase using a drill battery or 9v even.
They should move in unison.
Only thing I can think of to check unless its signal somehow.
His is WAY louder? And yours is just abnormally quiet?
Its so simple its often overlooked.
And unless the prefabs are identical tunings may be quite different
 

Bobbytwonames

Trigger Man!
Aug 28, 2018
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Those Skar Rp amps are not clean at all. I agree with your pops, it's the amp. Plus, how many cubes is your box? If your trunk is 12 cubes, then, a 5 cube (give or take) box shout fit fine.
 

Bobbytwonames

Trigger Man!
Aug 28, 2018
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Vegas
I have a pair of Rockford Fosgate P3D4-12's wired @1ohm on a Skar RP-2000.1D. Theyre in a ported Fosgate box in my trunk, my trunk is 12 cubic feet, it barely fits in there. My dad has the same set up but with a Fosgate 1500 in a bigger trunk. His subs hit loads harder than mine, im trying to understand if his amp is just that much better than mine, I know Fosgate is better than Skar, but it's a HUGE difference, or idk if his extra trunk space is the reason. My subs move more than his, but with his you can feel much deeper and fuller bass. I've tinkered with just about every filter and setting I can, I can't even try to get them to hit the same, but im also not trying to spend 1,000 on an amp just for deeper bass. Just wondering if someone knows a reason I can't think of, I keep thinking it's the larger trunk and cabin space, but he swears it's the amp, any feedback will be appreciated
I'd like to see where your gain is compared to his. Bass Boost, subsonic, bass boost, deck settings and pre-output voltage. I would bet that his gain is even set lower than yours. All things usually aren't equal when all is said and done.
 

hispls

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Sep 10, 2009
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It's the box and/or vehicle acoustics. Post pics of the box as it sits in the trunk.
 

mastershake575

CarAudio.com Veteran
Mar 11, 2015
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Dallas
Most likely box.

Also the Cruze has a 140 amp alternator which is good for a Sedan, your dad might have a 20-30 amp advantage over you plus better efficency rating if your alt has never been replaced. His car might also have better OEM deadening as well.
 

2RZ-FE

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Mar 14, 2011
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Those boxes are engineered to be as loud and as efficient as possible given their size. I doubt Rockford would engineer something that completely svcks. My guess is it’s something else
 
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Clifff150

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Jan 10, 2012
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Texas
Do you have your rear deck speakers removed or are they still there? Does your dad have them removed or installed?
 

kaleb.n.willis

CarAudio.com Newbie
Apr 5, 2021
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Kansas City
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  • #16
Most likely box.

Also the Cruze has a 140 amp alternator which is good for a Sedan, your dad might have a 20-30 amp advantage over you plus better efficency rating if your alt has never been replaced. His car might also have better OEM deadening as well.
Only difference ive noticed with deadening is his trunk had a carpet liner on the lid, other than that they're both shit GM cars, we're both running dual batteries aswell, so idk if the alternator would be the cause, I dont have a multimeter on hand, but my lights don't dim no matter the music setting so idk if it's that or not
 

kaleb.n.willis

CarAudio.com Newbie
Apr 5, 2021
7
0
Kansas City
  • Thread Starter Thread Starter
  • #17
I would put my money on the box
How handy are you with doing woodwork
Not terrible, but anything bigger than the fosgate prefab would have to be built inside the car itself, there is maybe 3-4inches side to side, a foot front to back, and an inch top to bottom
 

kaleb.n.willis

CarAudio.com Newbie
Apr 5, 2021
7
0
Kansas City
  • Thread Starter Thread Starter
  • #18
Also, I feel I worded it wrong, it isn't necessarily his is louder than mine, its just the bass is deeper. If I had to describe it, mine will flick your forehead but his will punch you in the jaw. It still shakes the car and what not the same, it just doesn't have that same punch
 

Clifff150

Senior VIP Member
Jan 10, 2012
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330
Texas
Remove your 6x9’s in the rear and more bass will get into the cab. Did it to my mustang and it was night and day.
 
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