Frequency help

[bmrbob 10+ year member]

I was wondering about all of this Fs, Vas, Qes, Qms, Qts, Xmax stuff? Say if you had two different 10 in. subs, they were in their own seperate box, and the boxes were exactly the same. Will the sub with the lower "Fs" be able to hit lower notes in the box than the other sub? I just need help. Thanks

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[tRiGgEr 5,000+ posts]

Will the sub with the lower "Fs" be able to hit lower notes in the box than the other sub? I just need help. Thanks

No. Running 2 seperate drivers is not recomended, not only looking tacky they are 2 totaly differently built drivers. And will not sound the same.

http://www.bcae1.com

 

[squeak9798 5,000+ posts]

Understanding speaker parameters: http://editweb.iglou.com/eminence/eminence/pages/params02/params.htm

 

[tRiGgEr 5,000+ posts]

Thanks for the link Squeak.

 

[squeak9798 5,000+ posts]

BTW, here is a nice post by Supergrass (Steven (Stephen?) Ponte, formerly of TC Sounds):

Things that dictate low frequency response:

Environment - usually, a vehicle's transfer function offers a HUGE boost in the sub-bass region. Typically, a 20dB natural boost @ 16Hz.

Enclosure - in a car, sealed will ALWAYS play lower than a vented enclosure. Typical sealed box woofers have no problem reaching down to 10Hz flat, in car.

Driver: Fs is NOT a huge determiner of LFE. Qt is. The higher the Q, the lower the woofer will play - always. The more moving mass, the lower the driver will play (relative to Q). Less BL product (relative to Q). Etc etc etc.

Excursion - will my driver have the ability to move enough air to play that low? Remember, in a sealed environment, or IB (etc), the lower the speaker plays, the more excursion is needed.

Cms, or compliance usually has VERY little to do with how low a speaker will play. Now, keep in mind, that the lower the Fs of a driver is, the lower the Q is - and remember, a high Q always plays lower. So, a low resonance speaker isn't always good.

There is NO way to look at driver specs, to know how low a driver will play. You can get a good idea by looking at the Q. But, the BIGGEST factor of LFE, is environment. And, unless you map your transfer function of your vehicle, you cannot say that X driver will play down to Y.

Just a thought.

http://forum.elitecaraudio.com/showthread.php?threadid=87543&pagenumber=2

 

[bmrbob 10+ year member]

I wasn't planning on putting two different subs in my car at the same time...duh. I was just wondering because I am comparing two different subs. Thanks any though.

 

[bmrbob 10+ year member]

The box I have is 1.3 cu.ft. and is tuned to 32hz. Its going to get 700rms tops. It is going in the back of a 95 4runner (if that helps out with the environment aspect). I don't plan on participating on any comps anytime soon. So it will just be for everyday use. I'm not really going to be playing any test tones on it, so I guess the lowest bass it will get is just the lowest bass that there is in songs. Which of these two subs will be able to go lower and sound better overall (sq) then (spl). (has to be one of these two)

http://www.mycarjams.com/car_audio/hazel/detail/SPLW10

or

http://www.cardomain.com/item/ABNAW1006T

The perameters for the Audiobahn are these:

Fs:35.2, Vas:0.42cu.ft., Qes:0.89, Qms:3.93, Qts:0.72, Xmax:+/-19mm

Thanks

 

[tRiGgEr 5,000+ posts]

Which of these two subs will be able to go lower and sound better overall

Install dependant. Box mainly. And the SQ on both of those drivers are going to be very minimal at best. The main feature would be SPL if anything...