Has anyone ever added an inductor to a coaxial driver to make a slightly better top-end roll-off? I got a set of Infinity 6002si's and it looks like it would be easy. Would there be any benefit?
(yes, I realize that I should've gotten coaxials with true crossovers but these were on sale and I'm on a budget).
(yes, I realize that I should've gotten coaxials with true crossovers but these were on sale and I'm on a budget).
a great plan...
You may not get the correct value of inductor on the first shot, but if you have the time and patience to keep trying and listening it will probably be a much better speaker in the end.
You know the impedance the manufacturer quotes for the system, so you can calulate the theoretical value to be used to start. Rolling off the top faster will make the tweeter have a better chance of doing a good job. You might also consider adding an inductor in series with the woofer, it is probably adding some distortion and coloration to the mids as the cone goes into its breakup region.
Depending on how much room and just how fancy you want to get there are a couple of adjustable 12db/octave crossovers from parts express that might give you a good start on the process...
Stuart
You may not get the correct value of inductor on the first shot, but if you have the time and patience to keep trying and listening it will probably be a much better speaker in the end.
You know the impedance the manufacturer quotes for the system, so you can calulate the theoretical value to be used to start. Rolling off the top faster will make the tweeter have a better chance of doing a good job. You might also consider adding an inductor in series with the woofer, it is probably adding some distortion and coloration to the mids as the cone goes into its breakup region.
Depending on how much room and just how fancy you want to get there are a couple of adjustable 12db/octave crossovers from parts express that might give you a good start on the process...
Stuart
My first thought was to start with one in series with the woofer. It looks like they are wired in parallel; can I assume the woofer and tweeter are each 8 ohms nominal? The tweeter cap is 4.7uF, so that seems to make sense.
impedance...
The impedance of the drive units is probably close to the original manufacturers spec for the unit as a whole. The inductance of the woofer VC is normally enough to ensure it has rising impedance as the tweeter comes into the picture.
If you have an ohmmeter, measure the resistance of the VC's, an 8ohm speaker normally has a DC resistance of 5-6, while a 4ohm will be 2.5-3.
Unfortunately this is a very inexact science, the calculated values will be mostly wrong but close enough to get an idea...listening and adjusting is the only way to get best sound from any given drive units.
Good luck
Stuart
The impedance of the drive units is probably close to the original manufacturers spec for the unit as a whole. The inductance of the woofer VC is normally enough to ensure it has rising impedance as the tweeter comes into the picture.
If you have an ohmmeter, measure the resistance of the VC's, an 8ohm speaker normally has a DC resistance of 5-6, while a 4ohm will be 2.5-3.
Unfortunately this is a very inexact science, the calculated values will be mostly wrong but close enough to get an idea...listening and adjusting is the only way to get best sound from any given drive units.
Good luck
Stuart
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