The Fs of a driver is not necessarily the lowest frequency that a sub built with it will reproduce.
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Lowest frequency sub?
I am currently looking for a large sub driver that has the lowest frequency possible. The lowest I could find was an 18" driver made by Tumult that goes down to 15hz. Anyone know of any that go even lower?
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What determines how low it can go? Does the frequency of the driver make a big difference? For example; would a driver that goes down to 15hz be superior to a driver that goes down to 20hz?
| Originally Posted by Willd The Fs of a driver is not necessarily the lowest frequency that a sub built with it will reproduce. |
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Alot of things determine that, first of all, you need a driver with high excursion capability, then you need a reliable amplifier that will be able to output in those frequency, then you will need enough surface area on the driver to move the air. And you need a low tuned cabinet (if going to use vented). You also need a well-built cabinet for any application.
Thats the basic idea.
There are some exceptions, like servo feedback which enables the driver to perform better at lower frequencies in a sealed design. And Linkwitz Transform which also does a simple EQ to play lower frequencies in a sealed sub.
| Originally Posted by blake18 What determines how low it can go? Does the frequency of the driver make a big difference? For example; would a driver that goes down to 15hz be superior to a driver that goes down to 20hz? |
Thats the basic idea.
There are some exceptions, like servo feedback which enables the driver to perform better at lower frequencies in a sealed design. And Linkwitz Transform which also does a simple EQ to play lower frequencies in a sealed sub.
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From www.12volt.com , A link Thomas-w posted.
"FS- Driver free air resonance, in Hz. This is the point at which driver impedance is maximum. "This parameter is the free-air resonant frequency of a speaker. Simply stated, it is the point at which the weight of the moving parts of the speaker becomes balanced with the force of the speaker suspension when in motion. If you've ever seen a piece of string start humming uncontrollably in the wind, you have seen the effect of reaching a resonant frequency. It is important to know this information so that you can prevent your enclosure from 'ringing'. With a loudspeaker, the mass of the moving parts, and the stiffness of the suspension (surround and spider) are the key elements that affect the resonant frequency. As a general rule of thumb, a lower Fs indicates a woofer that would be better for low-frequency reproduction than a woofer with a higher Fs. This is not always the case though, because other parameters affect the ultimate performance as well."
Other parameters like Chris explained...Xmax, Sd(cone area), Tuning of the actual enclosure and EQ come into play to further effect frequency response.
| Originally Posted by blake18 I am currently looking for a large sub driver that has the lowest frequency possible. The lowest I could find was an 18" driver made by Tumult that goes down to 15hz. Anyone know of any that go even lower? |
"FS- Driver free air resonance, in Hz. This is the point at which driver impedance is maximum. "This parameter is the free-air resonant frequency of a speaker. Simply stated, it is the point at which the weight of the moving parts of the speaker becomes balanced with the force of the speaker suspension when in motion. If you've ever seen a piece of string start humming uncontrollably in the wind, you have seen the effect of reaching a resonant frequency. It is important to know this information so that you can prevent your enclosure from 'ringing'. With a loudspeaker, the mass of the moving parts, and the stiffness of the suspension (surround and spider) are the key elements that affect the resonant frequency. As a general rule of thumb, a lower Fs indicates a woofer that would be better for low-frequency reproduction than a woofer with a higher Fs. This is not always the case though, because other parameters affect the ultimate performance as well."
Other parameters like Chris explained...Xmax, Sd(cone area), Tuning of the actual enclosure and EQ come into play to further effect frequency response.
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Like others have said, it's not just the driver but the interaction of the driver with the air in a given enclosure. It's not just how low the whole assembly will go, but how low it will go while still producing sufficient sound pressure levels.
| Originally Posted by blake18 What determines how low it can go? Does the frequency of the driver make a big difference? For example; would a driver that goes down to 15hz be superior to a driver that goes down to 20hz? |
There are designs (BagEnd) for example where the box is run well below the Fs of the driver.
The only major benefit to really low Fs driver is that somewhat less EQ is needed for the lowest frequencies
The only major benefit to really low Fs driver is that somewhat less EQ is needed for the lowest frequencies
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A little more info....how big is the room? What have you heard so far, as far as deep bass subwoofers? Is the room dedicated or do you need to live in it also?
| Originally Posted by blake18 I am currently looking for a large sub driver that has the lowest frequency possible. The lowest I could find was an 18" driver made by Tumult that goes down to 15hz. Anyone know of any that go even lower? |
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The room is 22 x 23 feet. It will be the room I actually live in but my main focus on HT in the room, I'll sacrifice whatever I need to in order to get really REALLY deep bass. As far as deep bass goes, the lowest and deepest I have heard is the Klipsch RSW-12, very nice sub. If I could beat that sub I would be very happy. 
| Originally Posted by kgveteran A little more info....how big is the room? What have you heard so far, as far as deep bass subwoofers? Is the room dedicated or do you need to live in it also? |
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