Bose without Navigation Woofer?

jimimonet · 01-30-2011, 07:52 PM

I am taking the hatchback area apart to Dynamat it. I took the subwoofer out and since I am curious I took it apart. One question and one observation. How does the sound from the sub woofer get out, I mean there is a hard fiber cover over the sub then I have the stock floor mat and then the 40th floor mat. It seems to me that the path of the bass is so convoluted, most of the sound cannot get out. Next, I used to work for JBL and these little sub woofers cannot make much bass. I am guessing that the resonate frequency of these is over 1000 Hz. They are so stiffly suspended and they do not have much voice coil excursion. Has anybody tested the subs.

Red__Zed · 01-30-2011, 08:14 PM

Low frequencies travel relatively well through materials, and the layers covering the woofers are not that thick.

jimimonet · 01-31-2011, 06:43 AM

Red
Part of my point is I don't see how these produce much bass because they are so "stiff". A low frequency transducer must has a very compliant suspension as well as a long voice coil winding. Also whereas low frequency sound can trqavel through materials lots of distortion is introduced.

bigaudiofanat · 01-31-2011, 08:34 AM

The bose sub does not move air it just vibrates the area around it.

jimimonet · 01-31-2011, 10:04 AM

Big are you saying that the sub makes the hatchback floor shake? Obviously the natural frequency of the hatchback structure is no very low so it cannot virbrate at low frenquencies efficiently, not sub woofer frenquencies low anyway. I still maintain that the speaker cones are so stiffly suspended that they cannot produce low frequencies.

Wrenise · 01-31-2011, 10:07 AM

My understanding, if a speaker has the word "BOSE" on it, it works purely by magic.

I want a Z · 01-31-2011, 10:11 AM

Quote:

Originally Posted by Wrenise

My understanding, if a speaker has the word "BOSE" on it, it works purely by magic.

jimimonet · 01-31-2011, 12:09 PM

Unfortunatly as an engineer I don't believe in magic. A long time ago I actually met Dr. Bose. He is a smart guy and some of his stuff actually works. I am not a big fan thought.
I have a 40th and was disappointed that it did not come with a better multimedia system. I am going back and forth about putting a better system in it. I like to keep it stock but I want more.

optiontrader · 01-31-2011, 01:20 PM

Transmission line enclosure, I believe (I have yet to take my out - too busy driving; but I don't really agree with the sound the stock Bose puts out). If it's a short transmission line length, the Fs of the woofer needs to go up.

If the transmission line is 1-2 feet though, the resonant frequency shouldn't be any higher than 200-300Hz, however.

And yes, I agree - Bose = pure marketing magic. I doubt you'd wanna test out the woofer (or speaks) - it just might scare you. Remember the Acoustimass measurement debacle?

jimimonet · 01-31-2011, 05:23 PM

Option
While I generally agree with you about the T-Line enclosures and I don't know if the Bose sub is one because I have not taken it completely apart my problem is:
1: Low frequencies cannot be obtained with the speakers in the sub.
2: So much stuff is covering and hiding the sub that no clean sound can come from it to my ears.

I know I brought the car as is but what were they thinking when Nissan installed the sub.

optiontrader · 02-02-2011, 01:33 AM

Quote:

Originally Posted by jimimonet

I know I brought the car as is but what were they thinking when Nissan installed the sub.

Indeed. Nissan putting Bose in their cars at all intimately questions their line of thinking. It galls me seeing a Bose system in the GT-R, and when I sit in a GTI, hearing that Dynaudio setup is glorious.

jimimonet · 02-02-2011, 07:05 AM

I took the sub enclosure apart enough to see what it is. It is basically a round box with a vent. I would not call this a transmission line enclosure more like a ported enclosure. I still don't see how this produces any "low" frequencies.

01-30-2011, 07:52 PM	#1 (permalink)
jimimonet Base Member Join Date: May 2010 Location: KY Posts: 15 Drives: 40th # 764/1000 Rep Power: 14	Bose without Navigation Woofer? I am taking the hatchback area apart to Dynamat it. I took the subwoofer out and since I am curious I took it apart. One question and one observation. How does the sound from the sub woofer get out, I mean there is a hard fiber cover over the sub then I have the stock floor mat and then the 40th floor mat. It seems to me that the path of the bass is so convoluted, most of the sound cannot get out. Next, I used to work for JBL and these little sub woofers cannot make much bass. I am guessing that the resonate frequency of these is over 1000 Hz. They are so stiffly suspended and they do not have much voice coil excursion. Has anybody tested the subs.

01-31-2011, 08:34 AM	#4 (permalink)
bigaudiofanat Car Audio Installer Join Date: Jun 2009 Location: Magnolia DE Posts: 8,342 Drives: 2012 Infiniti G37x Rep Power: 852	The bose sub does not move air it just vibrates the area around it. __________________ Need help with car audio or electronics? Let me know!! Need Help Let Me Know Direct email address reimermatt@gmail.com Owner of: Dynamic Mobile Audio Follow me below https://www.facebook.com/Dynamicmobileaudio/

01-31-2011, 01:20 PM	#9 (permalink)
optiontrader Track Member Join Date: Jul 2010 Location: Smog Hell, SoCal Posts: 595 Drives: 40th Rep Power: 15	Transmission line enclosure, I believe (I have yet to take my out - too busy driving; but I don't really agree with the sound the stock Bose puts out). If it's a short transmission line length, the Fs of the woofer needs to go up. If the transmission line is 1-2 feet though, the resonant frequency shouldn't be any higher than 200-300Hz, however. And yes, I agree - Bose = pure marketing magic. I doubt you'd wanna test out the woofer (or speaks) - it just might scare you. Remember the Acoustimass measurement debacle? __________________ 40th Anniversary Z - 3M Paint Protection Film, CA Legal Tint! (70/40)

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01-30-2011, 08:14 PM	#2 (permalink)
Red__Zed A True Z Fanatic Join Date: Jul 2010 Location: window seat Posts: 28,940 Drives: Mostly on two wheels Rep Power: 119	Low frequencies travel relatively well through materials, and the layers covering the woofers are not that thick.

01-31-2011, 06:43 AM	#3 (permalink)
jimimonet Base Member Join Date: May 2010 Location: KY Posts: 15 Drives: 40th # 764/1000 Rep Power: 14	Red Part of my point is I don't see how these produce much bass because they are so "stiff". A low frequency transducer must has a very compliant suspension as well as a long voice coil winding. Also whereas low frequency sound can trqavel through materials lots of distortion is introduced.

01-31-2011, 10:04 AM	#5 (permalink)
jimimonet Base Member Join Date: May 2010 Location: KY Posts: 15 Drives: 40th # 764/1000 Rep Power: 14	Big are you saying that the sub makes the hatchback floor shake? Obviously the natural frequency of the hatchback structure is no very low so it cannot virbrate at low frenquencies efficiently, not sub woofer frenquencies low anyway. I still maintain that the speaker cones are so stiffly suspended that they cannot produce low frequencies.

01-31-2011, 10:07 AM	#6 (permalink)
Wrenise Base Member Join Date: Jan 2011 Location: Kaiserslautern Germany Posts: 59 Drives: 2011 G37S 6MT Sedan Rep Power: 14	My understanding, if a speaker has the word "BOSE" on it, it works purely by magic.

01-31-2011, 12:09 PM	#8 (permalink)
jimimonet Base Member Join Date: May 2010 Location: KY Posts: 15 Drives: 40th # 764/1000 Rep Power: 14	Unfortunatly as an engineer I don't believe in magic. A long time ago I actually met Dr. Bose. He is a smart guy and some of his stuff actually works. I am not a big fan thought. I have a 40th and was disappointed that it did not come with a better multimedia system. I am going back and forth about putting a better system in it. I like to keep it stock but I want more.

01-31-2011, 05:23 PM	#10 (permalink)
jimimonet Base Member Join Date: May 2010 Location: KY Posts: 15 Drives: 40th # 764/1000 Rep Power: 14	Option While I generally agree with you about the T-Line enclosures and I don't know if the Bose sub is one because I have not taken it completely apart my problem is: 1: Low frequencies cannot be obtained with the speakers in the sub. 2: So much stuff is covering and hiding the sub that no clean sound can come from it to my ears. I know I brought the car as is but what were they thinking when Nissan installed the sub.

02-02-2011, 07:05 AM	#12 (permalink)
jimimonet Base Member Join Date: May 2010 Location: KY Posts: 15 Drives: 40th # 764/1000 Rep Power: 14	I took the sub enclosure apart enough to see what it is. It is basically a round box with a vent. I would not call this a transmission line enclosure more like a ported enclosure. I still don't see how this produces any "low" frequencies.