@L.rivera92172
The piezo drivers really sound good. With high resolution.
Next time I do this modification I will make a waterfall measurement.
Makes me curious
The piezo drivers really sound good. With high resolution.
Next time I do this modification I will make a waterfall measurement.
Makes me curious
Feedback on the use of a new type for glue for the thin foil from the goldsmith.
Easier work with methylcellulose - its the glue used for wallpapers.
It has less damping properties than the "Anlegemilch" usually used for thin foil metals but its easier to work with and tidier work is possible.
It has stiffening properties.
Here I tried it on piezo drivers. Will measure if there is a benefit using sandwich technology on piezo paper cones.
Easier work with methylcellulose - its the glue used for wallpapers.
It has less damping properties than the "Anlegemilch" usually used for thin foil metals but its easier to work with and tidier work is possible.
It has stiffening properties.
Here I tried it on piezo drivers. Will measure if there is a benefit using sandwich technology on piezo paper cones.
Attachments
made a series of measurements
Arta f response and waterfall
4 no name piezos and one
Monacor MPT-142
all have filter:
12 ohm in line 1uF in line, 91 ohm across plus and minus on the driver
no name piezos
1 driver original
2nd driver 1x alu foil
3rd driver 2x alu foil - sandwich
4th driver 2x alu foil + damped cavity with medical cotton
5th driver Monacor MPT142
2x foil plus damped cavity
Arta f response and waterfall
4 no name piezos and one
Monacor MPT-142
all have filter:
12 ohm in line 1uF in line, 91 ohm across plus and minus on the driver
no name piezos
1 driver original
2nd driver 1x alu foil
3rd driver 2x alu foil - sandwich
4th driver 2x alu foil + damped cavity with medical cotton
5th driver Monacor MPT142
2x foil plus damped cavity
Attachments
especially on piezo cones the cone stiffening foil raises resonance frequency. Due to the lack of a real suspension.
The suspension was not covered with foil.
The quality piezo MPT142 shows better linearity.
Very effective is the damping of the cavity with medical cotton
The suspension was not covered with foil.
The quality piezo MPT142 shows better linearity.
Very effective is the damping of the cavity with medical cotton
Attachments
if bandwidth is important in a piezo project I would damp it only thinly with silicone sealant (no cone stiffening).
This should not raise the resonance frequency.
This should not raise the resonance frequency.
in a previous design I put the tweeter concentric in front of the driver. Always sounds good like this.
This time I put it above the fullrange driver.
Turning the box shows the highs sound better integrated with the tweeter at the side, so distance to the ear changes for better.
This time I put it above the fullrange driver.
Turning the box shows the highs sound better integrated with the tweeter at the side, so distance to the ear changes for better.
