Good IB 15" sub

[Trey803 5,000+ posts]

idq

Click to read more...

 

[Horsemanwill 10+ year member]

IDQ or ID any of the Image dynamics subs do great IB

 

[Mc_Hammer 10+ year member]

google "acoustic elegance"... you will find a sub that will intrest you very much //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

 

[audioholic 5,000+ posts]

Idw //content.invisioncic.com/y282845/emoticons/suave.gif.858fc102f7646e678ee8af7e1fbc41d1.gif

 

[Horsemanwill 10+ year member]

the ID 15 comes out ina couple weeks

 

[jdawg 5,000+ posts]

Dayton makes one, not sure if Fi is still doing theirs. I know alot of guys run Q's in their house but something is changed about them.

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=295-455

 

[audioholic 5,000+ posts]

Here's another option from AE.

http://www.aespeakers.com/drivers.php?driver_id=8

 

[Mc_Hammer 10+ year member]

google "acoustic elegance"... you will find a sub that will intrest you very much //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

Here's another option from AE.
http://www.aespeakers.com/drivers.php?driver_id=8

i beat you to it //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

 

[audioholic 5,000+ posts]

i beat you to it //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

My linked out reply pwns your vague reference to a search engine. //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

 

[donpisto 5,000+ posts]

A couple others other than the ones listed:

Maelstrom-X:

http://www.diycable.com/main/product_info.php?products_id=681

Exodus DPL:

http://www.diycable.com/main/product_info.php?products_id=684

Fi IB3:

https://ssl.perfora.net/www.ficaraudio.com/sess/utn;jsessionid=15491db6a6a8205/shopdata/0050_Speakers/0050_IB3/product_overview.shopscript

 

[donpisto 5,000+ posts]

.707 qts
What does that mean...? In english

Here is a detailed explanation: http://www.the12volt.com/caraudio/thiele.asp

Obtaining .707 will give you the smoothest rolloff and the lowest F3, which in turn affects cabin gain. Here is another link that can help explain it. http://www.iroczone.com/technical/Subwoofer/

 

[John_E_Janowitz 10+ year member]

Here's another option from AE.
http://www.aespeakers.com/drivers.php?driver_id=8

A few things about IB subwoofers in general. For home theater use, IB subs are mounted taking advantage of an attic space, closet, basement, garage, etc as the enclosure volume. For an IB to perform properly you ideally want the volume to be equal to a minimum of 4x the Vas of the drivers. This will make the Qtc of the system equal to the Qts of the driver. In this case, .707 is what we are looking for. The original IB15 was designed specifically for home theater infinite baffle use. They are typically sold in groups of 4 or 8. Fs is very low at 16Hz and suspension is very soft to allow them to take very efficient use of Xmax. The less power you need to move the driver to full excursion the better. With the Qts of .707 and Fs of 16Hz, your F3 point is going to be approximately equal to that 16Hz Fs, assuming you have enough volume. In a typical home theater environment with room gain added you can expect good extension down to 10Hz in room. This is the best way to get that kind of low extension.

As the original IB15's have quite high Vas and Qts of .707, they do require a lot of volume. To work properly you need about 60cubic foot per woofer minimum to have the Qtc of the system around .7. Very practical in HT environments but not in a vehicle. You also have a totally different transfer function in a vehicle. Typically you have as much as 30dB of cabin gain in the 20hz region. Putting in a subwoofer that is flat to 16Hz with this type of gain is going to be very overpowering on the low end. You can see that for car use we need to do something different.

We designed the automotive version of the IB15 to have less mass, lower Qts and lower Vas. We need a driver with more overall efficiency to handle the higher frequency use. We want a driver with lower Vas and lower Qts so in the smaller vehicle trunk the Qtc ends up close to .707 or even a little lower. Attached is a transfer function comparison in a Regal and a Camry. You can see the huge rise peaking at around 20hz. With the auto IB version the response begins to roll off higher so it can sum reasonably flat with the cabin gain.

Here is a link to the info on our forum.

http://www.aespeakers.com/phpbb2/viewtopic.php?f=3&t=1647

John