a_recording
Member of the Trade: Lachlanlikesathing
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Just so I get this right, is the suggestion that if I made a small port for the driver, the bass response might actually improve? Or just the bass speed?
Well, you'll do one of two things. Opening up a sealed enclosure, untuned, very leaky, will raise the Q of the driver + enclosure. What this will do is raise the roll off point but make the roll off shallower. If you run a tuned port, i.e. a device that holds a column of air that can actually resonate, then you won't have the early run off like a leaky box and will extend the frequency response down lower, although there will be group delay on the bottom end due to the port using the 180 out of phase rear sound waves. Also for an in-ear configuration, the port would need to exit into the nozzle and into the ear to work. The port is a resonator and the driver nearly stops moving air at peak resonance. Basically around the tune frequency the port is the device making a lot of the sound. You can't just feed that into the outside world.
Most all of the IEMs simply using porting to create an aperiodic enclosure. The benefit is they can use smaller enclosures with higher Q drivers, gaining low frequency sensitivity in a smaller package.
So, basically the good way to make this work right is to do a custom mold with a dual port nozzle. The main port would be the front exit of the driver. The second port would be the tuned port for the enclosure. Think of something like the Triple.Fi 10 earphone but running a single driver out just one of the two ports. The second port is simply a path of specific diameter and length into the enclosure to tune the low end. That's pretty much the only way you'll make it work.
Well, you'll do one of two things. Opening up a sealed enclosure, untuned, very leaky, will raise the Q of the driver + enclosure. What this will do is raise the roll off point but make the roll off shallower. If you run a tuned port, i.e. a device that holds a column of air that can actually resonate, then you won't have the early run off like a leaky box and will extend the frequency response down lower, although there will be group delay on the bottom end due to the port using the 180 out of phase rear sound waves. Also for an in-ear configuration, the port would need to exit into the nozzle and into the ear to work. The port is a resonator and the driver nearly stops moving air at peak resonance. Basically around the tune frequency the port is the device making a lot of the sound. You can't just feed that into the outside world.
Most all of the IEMs simply using porting to create an aperiodic enclosure. The benefit is they can use smaller enclosures with higher Q drivers, gaining low frequency sensitivity in a smaller package.
So, basically the good way to make this work right is to do a custom mold with a dual port nozzle. The main port would be the front exit of the driver. The second port would be the tuned port for the enclosure. Think of something like the Triple.Fi 10 earphone but running a single driver out just one of the two ports. The second port is simply a path of specific diameter and length into the enclosure to tune the low end. That's pretty much the only way you'll make it work.