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October 2019
Tweeter dome : The multitasking part
.Develop a tweeter requires to balance the active surface area, the force factor, the moving mass, the rigidity and the dome damping. Many brands are focused on mass/rigidity ratio for the dome, which help to make the tweeters science progress.
Nevertheless, some products show intense dome break up which provides sound coloration, even it is located in upper frequency.
So, damping is a parameter to keep in mind...and it must be carefully controlled to keep light moving mass.
If for a given surface area and force factor, a lighter dome help to extend the upper band and increase the efficiency, but it also reduces the mid-band extension.
Well known palliative are softer surround and create a rear chamber to decrease Fs[Hz], but it meets others limitation, such as rocking dome under large signals.
In another hand, large soft dome provides extended mid-band, but the highest frequency are smoothed, and sometime, the dynamic range too...
A is a typical 30mm soft dome. It is well damped, but its mass doesn't allow to get extended upper frequency, and the sensitivity isn't significantly better than a 25mm dome.
B is our 1st step in our engineering research. This 30mm soft dome is stiffer which is good to reproduce sound over 20kHz. Nevertheless, it is still heavy.
This version is comparable with some of the best soft dome tweeter references on the market.
C is our last improvement. This 30mm soft dome is very light and stiff, and its damping is close to perfection.
Measured at 1m, in speaker axe, 6V input signal, no front plate, same voice coil and basic motor structure for all prototypes.
See our product page to get the final frequency response of Twt30_vMS.
In this way, we preserve the dynamic range, we reproduce the audio signal over the human ears limits, and we keep a very low distortion rate (0,5% from 1500Hz to 10000Hz).
Crédit photo: .Kartesian company
To help the mid-band, and control the directivity, keeping neutral sounding, we have designed an short horn, machined in Aluminum.
You can discover more details about this fabulous tweeter on this page:
Let's continue to make the sound reproduction science progress!
Mr .K