Noise Cancellation ?

[MonsterBass]

I currently have one Kicker 15"L7 in a ported box powered by a Kicker KX1200.1 and I am thinking of adding my two extra subs( Sony 12" Xplod XSL123P5B). Will there be any cancellation if I run the 15" at frequencies of 100Hz and below and run the 12"s at 100Hz and above? The 12"s will probably be in a sealed box and have a seperate amp.

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[audioholic 5,000+ posts]

Hmm, where to start.

First off, 100hz and above is not subbass, your 12" subwoofer should not be playing in that range.

Secondly, your 15 should have no problem playing the necessary frequency range (20-100hz or so).

Third, Im guessing you want midbass, since you are asking about 100hz+. Midbass should be in the front stage. If you are looking for dedicated midbass drivers, look for some that will fit in front of you.

 

[squeak9798 5,000+ posts]

Audioholic summed it up.

Bad plan all the way around.

Give us a short list of what you are trying to actually accomplish, and we can help you come up with a much better solution.

 

[MonsterBass]

I just put new Infinity 6 1/2" speakers in the front door but the midbass is usually drowned out by the L7 that is in the back seat. I want to add another 15"L7 but then

I will probably never hear anything above 100hz.

P.S. Thanks for answering my question so quickly!

 

[audioholic 5,000+ posts]

You have to ask yourself, if you are already having a hard time hearing your front speakers over your sub, why are you looking to upgrade (double) your substage already? //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif Yeah, I already know... the fever. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

Well assuming the fronts are already well positioned and powered, it sounds like running a 3-way might be what you need. Sell the 12's and get some dedicated midbass drivers as I suggested earlier. Run them from like 60 or 80hz up to 200-300hz. Then your 6.5 comp mids kick in. This does multiple things...

Firt, it gives more midbass, alot more. Bigger driver, with considerably more displacement potential, playing a relatively narrow frequency band. Assuming its done correctly, midbass should be phenomenal, at least.

Second benefit this does is increase output ability of comp set (usually). When you run the midbass up to the 200-300hz, you can now cut off the comp mids at 200-300hz rather than the 100hz you had before. Expecting less bass output means more power input, and acoustical output potential, before the driver will fail. This is generally speaking, and the tweeter comes into play, as its freq band has not changed. Increasing power on the mids should be done while closely monitoring the tweeter performance.

There are downsides hwoever of course. Mounting dedicated midbass' means (usually) moving the comp mids to the kick to avoid complications with the midbass drivers. This usually means custom work. Next, two more amplifier channels are required since you would be running active. Which brings us to the last big disadvantage, a more complicated crossover network that usually involves a new component as most h/u's dont have the capacity.

Running a 3-way setup can be very rewarding, but it can also be very costly and tricky. Which brings us to the last major reward of a 3-way system: rarity. There are alot of people out there running multiple front speaker setups and claiming its a 3-way... or more (one guy bragged to me about his 7-way front stage a while back). //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif Truth is unless some very basic, but many times difficult steps, are taken to ensure good performance... things like proper speaker placement and a competent xo network... the real performance gains simply wont be there.

..... or you could go to BestBuy and have them slap as many comp sets in your doors as will possibly fit.