IB gurus, please read...

[Fast1one 10+ year member]

I have built nearly every possible enclosure imaginable, from 8th order bandpass, to TLs, to ported boxes and even BLHs...so now its time to explore the realm of no box at all //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

I want to keep most of my output, or possibly exceed it (one 8, shouldnt be that hard //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif ), so I have decided to go with two 15s in the trunk of my maxima. Now obviously, with the trunk of my car only being about 15 cubes I won't be anywhere near TRUE IB, so I need some input on those who have done two 12s/15s in their trunks...

I have narrowed my sub choices to two, being that I want to stay under 200-250 for the pair....

The first idea would be the MAWs. They kinda have a low QTS, and not too low an FS and semi low VAS. This would put me at roughly two times the VAS with this setup... http://mach5audio.com/maw-15.html

The second pair will be unnamed, as they are in an ebay auction and I don't want my auction to get snatched //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif Just know that they are very cheap, less than 150 for the pair. QTS of .71, QMS of 4.84, and QES of .69, VAS of 7 cu ft something, which would put me at 1 times VAS for the pair in my trunk... 18 mm of x max which is a plus

Im leaning towards the cheapos for now, they aren't of horrible quality and the seem to have pretty good specs....Any other suggestions feel free to chime in //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

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[squeak9798 5,000+ posts]

Pretty hard to compare the Mach's to a driver of unknown origin //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Anyways....it really depends on what type of "sound" you are going for....high Q or low Q. Low Q/low Fs drivers will typically provide good bottom end but lack impact in the upper bass/lower midbass region. High Q/mid-high Fs drivers will perform very similarly to a high'ish Q sealed enclosure.

If you prefer the sound of low Q alignments and don't need the subwoofers to provide midbass reinforcement....I think the 2nd subwoofer might not be the best fit.

Also as you mentioned....cars don't always provide a true IB enviornment....so that .71 Qts is in all likelyhood going to be raised even higher.....which is another reason many people prefer to stick with a Qts below .45 - .5

Anyways...you can run anything IB. Just need to find a driver that will result in the type of sound you are trying to achieve.

 

[bass_lover1 10+ year member]

From what I've heard the Dayton RS HF drivers work very well in large box or IB applications, they don't cost an arm and a leg and have a decent amount of output.

I used the HO 12" driver for a few months, and it sounded great, granted it was in a small sealed enclosure, but I would imagine them to sound similar, they both use a similar motor design.

 

[Fast1one 10+ year member]

Pretty hard to compare the Mach's to a driver of unknown origin //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
Anyways....it really depends on what type of "sound" you are going for....high Q or low Q. Low Q/low Fs drivers will typically provide good bottom end but lack impact in the upper bass/lower midbass region. High Q/mid-high Fs drivers will perform very similarly to a high'ish Q sealed enclosure.

If you prefer the sound of low Q alignments and don't need the subwoofers to provide midbass reinforcement....I think the 2nd subwoofer might not be the best fit.

Also as you mentioned....cars don't always provide a true IB enviornment....so that .71 Qts is in all likelyhood going to be raised even higher.....which is another reason many people prefer to stick with a Qts below .45 - .5

Anyways...you can run anything IB. Just need to find a driver that will result in the type of sound you are trying to achieve.

That makes perfect sense now! No wonder I was seeing conflicting opinions on QTS, in car though a low QTS/low fs driver is preferred because of its lowend, which is what I am looking for. I have no need for lower midbass, thats what my front stage is for //content.invisioncic.com/y282845/emoticons/naughty.gif.94359f346c0f1259df8038d60b41863e.gif
Thanks for the response man really appreciate it, I think I may try the MAWS, I'll keep looking though, as an 18 inch driver or single high performance 15 is still not out of the question. Looking specifically at the upcoming (soon I hope) IXL 18.4

http://www.soundsolutionsaudio.com/forum/index.php?showtopic=7815

Has very good specs //content.invisioncic.com/y282845/emoticons/fro.gif.c695f1f814b01c4ad99fe7f8cccadd29.gif

Bass lover, I was actually looking at that 15 (and the titanik) for a single 15 inch setup. Ill keep that in mind as well //content.invisioncic.com/y282845/emoticons/yumyum.gif.0556df42231b304b9c995aefd13928a8.gif

 

[Warbleed 10+ year member]

Using a Low Q/Low Fs combination isn't necessarily going to give you any sort of midbass deficit. It will likely have less midbass output vs a High Q/High-Moderate Fs driver, but thats because those drivers will exhibit excess midbass output, whereas the Low Q/Low Fs combination yields what is typically described as "dry" sound.

Personally, I like Low Q/Low Fs combinations, as they tend to emphasize the biggest advantages of going IB. High Q/High Fs combinations can often end up with such a high Q that you aren't really even getting that much of a benefit, and often times you will end up with exaggerated lowend response as well.