different subs?

[Liquid Bass 10+ year member]

ok i know how we all make fun of ppl who have mix matched differnet size subs and say there is cancelation, but today i was just messing around and hooked my 12 in sub up with my 18 in my car and it was louder, so what i am asking is why if cancelation occurs is it louder? and dont worry i still think it is stupid i am just wondering

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[dan5505 10+ year member]

maybe its possible to get constructive interference instead (or along with) destructive interference. either way, you will probably loose sound quality.

 

[JimJ 5,000+ posts]

Did you meter the difference? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[audioholic 5,000+ posts]

Constructive interferance is called sound wave reinforcement. 'Interferance' simply means altering the wave's original intensity (in this situation). This can result in a cut in output (cancellation), or an increase in output (wave reinforcement). When a smooth, controlled and predictable frequency response is desired, interferance as in cancellation OR reinforcement, is generally a bad thing.

To the OP, you are mistaking the terms interferance and cancellation. You will gain in some freqs, lose in others. Over all your output is inevitably going to go up, but your frequency is what will likely suffer.

9 out of 10 times when someone tries to justify different sized subs, its 'big sub for low freqs, small sub for upper freqs'. The reality is, the subwoofer plays the smallest frequency spectrum of any speaker in your system (probably) and does NOT need to have its frequencies sub-divided again. If your sub cannot play the limited range you are asking of it, something is wrong beyond the diameter of the cone.

 

[Liquid Bass 10+ year member]

Did you meter the difference? //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

no i didnt it just sounded louder to the ear but idk its not like im going to keep it anyway and turn into another cotjones lol

 

[T3mpest 10+ year member]

Your not likely to get cacellation of subbass frequencies in a car, unless you literally wire the subs out of phase with one another. All mixing sub sizes does is give you a irregular frequency response. Technically, most people's boxes on this forum do the same thing. Not condoning mixing sub sizes, just pointing out the obvious.

 

[audioholic 5,000+ posts]

Your not likely to get cacellation of subbass frequencies in a car, unless you literally wire the subs out of phase with one another. All mixing sub sizes does is give you a irregular frequency response. Technically, most people's boxes on this forum do the same thing. Not condoning mixing sub sizes, just pointing out the obvious.

I assume this is a reference to group delay. If so, I tend to agree, but believe its worth noting that even if I have a system with group dlay, I would not want to add irregularities on top of that.
You might get me to agree so far as adding diff sized subs is likely to make your system louder over all, but those more specific desired improvements (small subs for upper bass, big subs for lower bass) is almost never real.

Most people try to justify multiple sized subs with some personal theory on frequency response, wave interaction, or some other guess. In the end it always boils down to they think it sounds better that way (ie: cotjones) because they haven't gained the experience to realize that most times, simpler is better, and sounds better. If you want to get stupid loud, sure knock yourself out, run diff subs. But if you think you are doing it for some sonic improvement, think again.

You can get cancellation at 1/4 and 1/2 waveforms btw, easily attainable inside a vehicle. If we couldn't get cancellation of subbass inside a car, changing its position/placement would have no audible affect. We know that to be false, it can make large differences in sound.

Cheers.

 

[Liquid Bass 10+ year member]

I assume this is a reference to group delay. If so, I tend to agree, but believe its worth noting that even if I have a system with group dlay, I would not want to add irregularities on top of that.
You might get me to agree so far as adding diff sized subs is likely to make your system louder over all, but those more specific desired improvements (small subs for upper bass, big subs for lower bass) is almost never real.

Most people try to justify multiple sized subs with some personal theory on frequency response, wave interaction, or some other guess. In the end it always boils down to they think it sounds better that way (ie: cotjones) because they haven't gained the experience to realize that most times, simpler is better, and sounds better. If you want to get stupid loud, sure knock yourself out, run diff subs. But if you think you are doing it for some sonic improvement, think again.

You can get cancellation at 1/4 and 1/2 waveforms btw, easily attainable inside a vehicle. If we couldn't get cancellation of subbass inside a car, changing its position/placement would have no audible affect. We know that to be false, it can make large differences in sound.

Cheers.

thanx man that totally answers my question