- Oct 15, 2003
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Some things to think about:
1. FS
The FS of the driver can be a big factor in the perception of fast bass. If the FS is high around 30 or 35 hz then the driver will yield better sounding bass in the area where most of the bass energy is located in music. Most PA systems I have designed always tend to roll bass off below 30 hertz. To get a higher FS the driver suspension is tighten up which will affect the sound of the bass you end up with.
2. Vented driver for a vented box
Sadly most drivers today are really intended for sealed boxes but do to marketing they will say they will work great in vented enclosures. The TS numbers don't lie though and the sound may not be the greatest. I prefer a driver actually be designed for the box I'm working with. A low Q driver for Vented box is still my preference.
3. 10 hertz
Do you really need 10 hertz, probably not, most music gets rolled off at 30 hertz or so and rock music usually doesn't go below that. A friend measured the bass energy in 2000 dvd's and found that they didn't get below 25 hertz and that most bass energy was in the 30 to 40 hertz area.
4. 18 inch vs 10 inch
The problem isn't the size of driver as much as what your forcing it to do. Getting an 18" driver to play 15 hertz is pretty easy but making it play 15 hertz and then 80 hertz is where the muddiness usually begins. If an 18" is made to do what it is good at which is play very low bass then it will do that very well, an 18" playing 15 to 30 hertz and then another driver taking over above 30 hertz is ideal. The FS is important here, forcing a 18" with a 35 hertz FS to play 15 hertz won't be very easy. Using an 18 inch with a 15 hertz FS is a lot more ideal.
5. My driver has a 35 mm xmax why isn't it loud ?
Excursion isn't everything, the size the box is a huge factor. A 18" in a 2 cubic foot box just isn't going to be that loud even if the driver has a huge excursion. Placed in a car might help but in the outside world the box size is very important. Take an 18" driver and put it into a 20 cubic foot box that it was designed for and the output will go up dramatically.
1. FS
The FS of the driver can be a big factor in the perception of fast bass. If the FS is high around 30 or 35 hz then the driver will yield better sounding bass in the area where most of the bass energy is located in music. Most PA systems I have designed always tend to roll bass off below 30 hertz. To get a higher FS the driver suspension is tighten up which will affect the sound of the bass you end up with.
2. Vented driver for a vented box
Sadly most drivers today are really intended for sealed boxes but do to marketing they will say they will work great in vented enclosures. The TS numbers don't lie though and the sound may not be the greatest. I prefer a driver actually be designed for the box I'm working with. A low Q driver for Vented box is still my preference.
3. 10 hertz
Do you really need 10 hertz, probably not, most music gets rolled off at 30 hertz or so and rock music usually doesn't go below that. A friend measured the bass energy in 2000 dvd's and found that they didn't get below 25 hertz and that most bass energy was in the 30 to 40 hertz area.
4. 18 inch vs 10 inch
The problem isn't the size of driver as much as what your forcing it to do. Getting an 18" driver to play 15 hertz is pretty easy but making it play 15 hertz and then 80 hertz is where the muddiness usually begins. If an 18" is made to do what it is good at which is play very low bass then it will do that very well, an 18" playing 15 to 30 hertz and then another driver taking over above 30 hertz is ideal. The FS is important here, forcing a 18" with a 35 hertz FS to play 15 hertz won't be very easy. Using an 18 inch with a 15 hertz FS is a lot more ideal.
5. My driver has a 35 mm xmax why isn't it loud ?
Excursion isn't everything, the size the box is a huge factor. A 18" in a 2 cubic foot box just isn't going to be that loud even if the driver has a huge excursion. Placed in a car might help but in the outside world the box size is very important. Take an 18" driver and put it into a 20 cubic foot box that it was designed for and the output will go up dramatically.