This is actually funny because I have heard this from salesmen at different stereo shops. I suspect it is a "talking" point they are taught from the marketing reps because the wording is so simillar. It sounds resonable. How many people can challenge such a statement? - Only people who know the Red Book standard for CD's, or folks who have the test equiptment to do the analysis.
This is actually funny because I have heard this from salesmen at different stereo shops. I suspect it is a "talking" point they are taught from the marketing reps because the wording is so simillar. It sounds resonable. How many people can challenge such a statement? - Only people who know the Red Book standard for CD's, or folks who have the test equiptment to do the analysis.
here is my arguement for why you cant say 8's are tighter than 15's
they make different motor structures for a reason!!!! just like in a car, a v8 was made to power a bigger car, while an i4 was for a small compact car.
thus, they made a stronger, quick, motor for larger subs.
MIKE
they make different motor structures for a reason!!!! just like in a car, a v8 was made to power a bigger car, while an i4 was for a small compact car.
thus, they made a stronger, quick, motor for larger subs.
MIKE
Triumph
Lifer
- Oct 9, 1999
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Well that only negates the 2nd part of my argument, if it is correct. The first part still remains: BLi = ma cannot be reduced down to simply i = a, as the linked article contends. The C's are different and can't be divided out like that. Therefore, acceleration of the driver is still inversely proportional to the mass.
The "acceleration" of the driver is a moot point and can be derived from the frequency the driver is playing.
If it accelerates "slower" then the frequency is lower, if it gets faster, the frequency gets faster.
This talk of motors and physics and magnets is as preposterous as arguing which car is faster, the small one with this engine, or the other one with that engine, COMPLETLY missing the point that they just drag raced so you have the 0-60 times imperically, and the theoretical 0-60 pointless to argue about.
If it accelerates "slower" then the frequency is lower, if it gets faster, the frequency gets faster.
This talk of motors and physics and magnets is as preposterous as arguing which car is faster, the small one with this engine, or the other one with that engine, COMPLETLY missing the point that they just drag raced so you have the 0-60 times imperically, and the theoretical 0-60 pointless to argue about.
Yep. Frankly, I'm still not convinced mass is meaningless.
If I can see a proof that 2 cones of different masses accelerate at the same rate with the same moving force, then I'll be convinced.
If I can see a proof that 2 cones of different masses accelerate at the same rate with the same moving force, then I'll be convinced.
Regarding subwoofer placement.....Boundary Effect.... The Math ........ The real world results.........
Not getting anything above 12,000 would sound pretty dreadful. I put a filter in at 12,000 and the music became lifeless. Also 5 hertz is completely not neccessary since music musical instrutments don't play that low. I believe the lowest is 16 hertz and most rock and rap music won't go much below 30 hertz.
Not everyone avoids home theater completely.
Speakers are used for more than just musical instruments.Originally posted by: Apex
Not everyone avoids home theater completely.
Yeah but to get loud 5 hertz bass that you could actually feel would require a really outrageous subwoofer setup. Most DVD's get filter below 30 hertz as to not blowup cheaper subwoofers. Oddly enough THX setups get bass below 35 hertz cut so it doesn't become booming cause of room gain.
Can someone explain mathematically why you can't just use a single 15" driver to reproduce the entire frequency range? Why do you need to switch to smaller drivers at higher frequencies? Could a 20mm tweeter reproduce frequencies down to 100Hz?
1. Sound Quality: a single 15 would strain trying to reproduce the entire spectrum.
2. Cost: Actually easier and cheaper to build a 2-way or 3-way system then one perfect 15".
Yeah, but <why> would a 15-inch driver strain at low frequencies and <why> does it need to be that big in the first place?
A 15" wouldn't strain at low frequencies unless it's being driven really hard, of which many factors are involved, none-the-least being the box and power input.
A bigger driver tends to move more air in a single sweep, creating more bass
A bigger driver tends to move more air in a single sweep, creating more bass
Well, you need lots of displacement to create loud bass. stroke * surface area of the diaphragm (cone) = displacement.Originally posted by: Woodchuck2000
Um, Thanks
Now, if you have a large surface area and a relatively small stroke, you can still create bass, but your moving mass will be too high to create the very high frequencies (i.e. moving the cone back and forth 20 000 times a second). Then you can use a small surface area and REALLY long stroke to do the bass, but it would be tremendously difficult to engineer a motor that can make the cone that far. This also necessitates a very loose suspension, and I'm not too sure about this, but SQ would generally suffer. There are wideband drivers out there, but they don't do the lower frequencies all too loudly.
This is all assuming the cone doesn't start to flex at higher frequencies... and if it does, you get a hell of a lot of distortion.
Originally posted by: Howard
Well, you need lots of displacement to create loud bass. stroke * surface area of the diaphragm (cone) = displacement.Originally posted by: Woodchuck2000
Um, Thanks
Now, if you have a large surface area and a relatively small stroke, you can still create bass, but your moving mass will be too high to create the very high frequencies (i.e. moving the cone back and forth 20 000 times a second). Then you can use a small surface area and REALLY long stroke to do the bass, but it would be tremendously difficult to engineer a motor that can make the cone that far. This also necessitates a very loose suspension, and I'm not too sure about this, but SQ would generally suffer. There are wideband drivers out there, but they don't do the lower frequencies all too loudly.
This is all assuming the cone doesn't start to flex at higher frequencies... and if it does, you get a hell of a lot of distortion.
Some large diameter driver can run WELL beyond a 1000 hertz. So, its close to doablke.... 1 guy I had read about was working (planning) on trying a 10 or 12" driver and a tweeter. Thats it. Dunno if it really ever went anywhere though.
So if you take a particular driver, put a sine wave in at constant power, vary the frequency and record the output SPL, you'd get a nice bell curve? There'd be a peak effeciency somewhere in the middle tailing off either side?
Nope, and in fact, the flatter and smooth a frequency response curve, the better.
Here's a specsheed on a tweeter with an FR curve inside:
http://www.focal.tm.fr/fr/compo/tweeter/pdf/TC90TD5.pdf
And here's one for a 15" subwoofer:
http://www.focal.tm.fr/fr/compo/woofer/pdf/15K8711.pdf
And yes, there is a peak efficiency somewhere in the FR curve.
Here's a specsheed on a tweeter with an FR curve inside:
http://www.focal.tm.fr/fr/compo/tweeter/pdf/TC90TD5.pdf
And here's one for a 15" subwoofer:
http://www.focal.tm.fr/fr/compo/woofer/pdf/15K8711.pdf
And yes, there is a peak efficiency somewhere in the FR curve.
i owned a cerwin-vega stroker 15" speaker. it cost around $750. i had it in a box i built that was around 5 cubic feet with a huge rectangular port. i thru in this bass mekanic cd that had a track from 1hz to 100 or something like that. it was amazing too see everything in my car shake before you could even hear anything.
I agree tho. 4 15's in a sealed box is what i would prefer tho. that would do the trick.
JBLaze
I agree tho. 4 15's in a sealed box is what i would prefer tho. that would do the trick.
JBLaze
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