IB subs vs underseat upgrade?

Denny347 · 11-27-2010, 12:18 PM

Well, it is either upgrading my underseat subs with an amp and the Earthquake 8" or an IB with a 12" (Fi or ID) firing through the hole I will make behind the arm rest. Neither one is terribly difficult for me to do. My question is which set up will likely sound the best. In truth, the L7 bass is not that bad but obviously could be better. I am leaning towards the IB 12" as the better sounding set up but I have heard great reviews of the underseat upgrades.

Technic · 11-27-2010, 12:25 PM

Quote:

Originally Posted by Denny347

Well, it is either upgrading my underseat subs with an amp and the Earthquake 8" or an IB with a 12" (Fi or ID) firing through the hole I will make behind the arm rest. Neither one is terribly difficult for me to do. My question is which set up will likely sound the best. In truth, the L7 bass is not that bad but obviously could be better. I am leaning towards the IB 12" as the better sounding set up but I have heard great reviews of the underseat upgrades.

Get the sub.

fdriller9 · 11-27-2010, 01:07 PM

Yea I ending up blowing my sws-8s with a JL 500/1. I have a trunk sub now and have my stock L7 woofers amped.

kaigoss69 · 11-27-2010, 02:00 PM

If you go the trunk sub route, I would recommend also amping the underseats as this will allow you to split the signal into mid- and sub bass, so you will not have any overlap and get a little more thump from under the seats.

fdriller9 · 11-27-2010, 02:42 PM

Quote:

Originally Posted by kaigoss69

If you go the trunk sub route, I would recommend also amping the underseats as this will allow you to split the signal into mid- and sub bass, so you will not have any overlap and get a little more thump from under the seats.

+1...I forgot to mention my underseats are bandpassed between 65Hz and 150Hz.

Denny347 · 11-27-2010, 04:48 PM

I was wonder that, using the factory under seat subs as midbass with a seperate amp and properly crossed over. I'm liking that idea more and more.

Rob G · 11-27-2010, 05:17 PM

Has anyone put a pair of 8 inch drivers on the rear deck? If you used the same speakers (Jehnert, Morel) as you put underseat, you could blend the sound pretty well especially with bandpass. Free firing woofers can be efficient, right?

fdriller9 · 11-27-2010, 06:22 PM

If there meant to be free air then yes...of theyre meant to be in an enclosure then you porbably won't get any output.

VP Electricity · 11-27-2010, 06:44 PM

Rear deck midbass ruins your front stage. We discern the source of midbass.

I wouldn't do it.

TMR · 11-27-2010, 09:06 PM

My freeair system sounds amazine.

fdriller9 · 11-27-2010, 09:36 PM

^that looks ridiculous...what kind of subs are those?

TMR · 11-28-2010, 12:37 AM

Image Dynamics IDQ15

Denny347 · 11-28-2010, 10:02 AM

Quote:

Originally Posted by TMR

Image Dynamics IDQ15

So they vent through the ski pass? I do not have fold down seats but I am gonna cut the area behind my arm rest. Do you need to keep the arm rest down?

TMR · 11-28-2010, 10:26 AM

Quote:

Originally Posted by Denny347

So they vent through the ski pass? I do not have fold down seats but I am gonna cut the area behind my arm rest. Do you need to keep the arm rest down?

Yes

Rob G · 11-28-2010, 12:15 PM

Quote:

Originally Posted by VP Electricity

Rear deck midbass ruins your front stage. We discern the source of midbass.

I wouldn't do it.

Understood. As someone else suggested I would bandpass the underseats at 60 to whatever sounds best with the door midranges. The rear deck woofers would low pass at 60. The 8 inchers would keep it tight. I wouldn't care if I got 20 hz out of it, I'm not in any competitions. IB is efficient and linear, correct?

kaigoss69 · 11-28-2010, 01:08 PM

Quote:

Originally Posted by Rob G

Understood. As someone else suggested I would bandpass the underseats at 60 to whatever sounds best with the door midranges. The rear deck woofers would low pass at 60. The 8 inchers would keep it tight. I wouldn't care if I got 20 hz out of it, I'm not in any competitions. IB is efficient and linear, correct?

Put a decent 12 in the trunk in a small sealed enclosure and call it a day. Cutting up the rear deck will look ugly, devalue your car, and probably not sound very good on top of it.

elratrero69 · 12-11-2010, 03:27 PM

That looks pretty cool.

sub Ib you convinced me and extra amp for midbass that is brilliant. and we keep some trunk space. Im gonna start mesuring right now.

11-27-2010, 12:18 PM	#1
Denny347 Major 347 Rep 1,076 Posts Drives: 2008 M3 E90 Join Date: Aug 2010 Location: Indianapolis, IN iTrader: (0)	IB subs vs underseat upgrade? Well, it is either upgrading my underseat subs with an amp and the Earthquake 8" or an IB with a 12" (Fi or ID) firing through the hole I will make behind the arm rest. Neither one is terribly difficult for me to do. My question is which set up will likely sound the best. In truth, the L7 bass is not that bad but obviously could be better. I am leaning towards the IB 12" as the better sounding set up but I have heard great reviews of the underseat upgrades.
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11-27-2010, 01:07 PM	#3
fdriller9 Banned 252 Rep 7,089 Posts Drives: '06 AW 330xi Join Date: Mar 2009 Location: North Jersey/Philly/NYC iTrader: (4) Garage List 2006 330xi [6.44]	Yea I ending up blowing my sws-8s with a JL 500/1. I have a trunk sub now and have my stock L7 woofers amped.
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11-27-2010, 02:00 PM	#4
kaigoss69 Brigadier General 300 Rep 3,969 Posts Drives: '08 335i Join Date: Jul 2008 Location: JAX iTrader: (6)	If you go the trunk sub route, I would recommend also amping the underseats as this will allow you to split the signal into mid- and sub bass, so you will not have any overlap and get a little more thump from under the seats.
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11-27-2010, 04:48 PM	#6
Denny347 Major 347 Rep 1,076 Posts Drives: 2008 M3 E90 Join Date: Aug 2010 Location: Indianapolis, IN iTrader: (0)	I was wonder that, using the factory under seat subs as midbass with a seperate amp and properly crossed over. I'm liking that idea more and more.
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11-27-2010, 05:17 PM	#7
Rob G Enlisted Member 1 Rep 41 Posts Drives: 2007 328i Join Date: Oct 2010 Location: Baltimore iTrader: (0)	Same question Has anyone put a pair of 8 inch drivers on the rear deck? If you used the same speakers (Jehnert, Morel) as you put underseat, you could blend the sound pretty well especially with bandpass. Free firing woofers can be efficient, right?
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11-27-2010, 06:22 PM	#8
fdriller9 Banned 252 Rep 7,089 Posts Drives: '06 AW 330xi Join Date: Mar 2009 Location: North Jersey/Philly/NYC iTrader: (4) Garage List 2006 330xi [6.44]	If there meant to be free air then yes...of theyre meant to be in an enclosure then you porbably won't get any output.
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11-27-2010, 06:44 PM	#9
VP Electricity Brigadier General 289 Rep 3,201 Posts Drives: F34 xDrive Join Date: Jan 2008 Location: portland oregon iTrader: (3)	Rear deck midbass ruins your front stage. We discern the source of midbass. I wouldn't do it.
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11-27-2010, 09:06 PM	#10
TMR Brigadier General 394 Rep 3,161 Posts Drives: M3 Join Date: Jun 2008 Location: Torrance iTrader: (12)	My freeair system sounds amazine. __________________ 2015 M3 BPM Tuned, Eibach, Magnaflow and more www.tmrmzine.com/m3/f80 SOLD E92 Slēk Carbon Fiber Widebody M3 www.tmrmzine.com/m3/slek/ SOLD E92 335i Stage 3+ with all the toys www.tmrmzine.com/335/ SOLD E39 M5 Modded, What a great car! www.tmrmzine.com/m5/
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11-27-2010, 09:36 PM	#11
fdriller9 Banned 252 Rep 7,089 Posts Drives: '06 AW 330xi Join Date: Mar 2009 Location: North Jersey/Philly/NYC iTrader: (4) Garage List 2006 330xi [6.44]	^that looks ridiculous...what kind of subs are those?
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11-28-2010, 12:37 AM	#12
TMR Brigadier General 394 Rep 3,161 Posts Drives: M3 Join Date: Jun 2008 Location: Torrance iTrader: (12)	Image Dynamics IDQ15 __________________ 2015 M3 BPM Tuned, Eibach, Magnaflow and more www.tmrmzine.com/m3/f80 SOLD E92 Slēk Carbon Fiber Widebody M3 www.tmrmzine.com/m3/slek/ SOLD E92 335i Stage 3+ with all the toys www.tmrmzine.com/335/ SOLD E39 M5 Modded, What a great car! www.tmrmzine.com/m5/
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12-11-2010, 03:27 PM	#17
elratrero69 Private 0 Rep 98 Posts Drives: 07 335xi AT sedan Join Date: Apr 2006 Location: SI, NY iTrader: (0)	That looks pretty cool. sub Ib you convinced me and extra amp for midbass that is brilliant. and we keep some trunk space. Im gonna start mesuring right now. __________________ 07 Bmw 335xi 07 A4 3.2 quattro
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