Free ARTA (LIMP) can measure impedance too.
ATB is/was very good, professional measurement system.
ATB is/was very good, professional measurement system.
will look after it just don't know how to use it.
For this I use arta at the moment but do not know how to measure distortion with steps.
The Atb system is calibrated with own amp.
For this I use arta at the moment but do not know how to measure distortion with steps.
The Atb system is calibrated with own amp.
piezo no name tweeter driver (alu sandwiched, back cavity damped)
6db crossover: 12 ohm in series, 90 ohm shunt across plus and minus and 1uF in line
Plastic horn measures: 27cm wide 7.5cm high, 12 cm deep
just wanted to see what the piezo horn does if amplitude corrected with equalizer apo (up to 25db) - irrespective of distortion
5khz could have been put more down by 2 or 3db
Does anyone know how to invert the frequency response in ARTA (in an easy way, possibly) ?
6db crossover: 12 ohm in series, 90 ohm shunt across plus and minus and 1uF in line
Plastic horn measures: 27cm wide 7.5cm high, 12 cm deep
just wanted to see what the piezo horn does if amplitude corrected with equalizer apo (up to 25db) - irrespective of distortion
5khz could have been put more down by 2 or 3db
Does anyone know how to invert the frequency response in ARTA (in an easy way, possibly) ?
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put the measuring level 15 db up and burst decay to 30 db back just to see what happens
- still the response stays stable
- still the response stays stable
checking now damping the piezo element (behind the paper cone of a piezo tweeter)
no name ksn1142 type - no horn! And with damping of the piezo element itself with self adhesive foam tape.
but: 1 x aluminized and wadding damping of the back cavity
6db filter 12 ohm in line, 1uF in line, 90 ohms between plus and minus
burst decay with 40db headroom
same type driver but without self adhesive foam tape on the backside of the piezo disc
burst decay 40db
damping the piezo element itself seems to work but it takes a little bit efficiency away
no name ksn1142 type - no horn! And with damping of the piezo element itself with self adhesive foam tape.
but: 1 x aluminized and wadding damping of the back cavity
6db filter 12 ohm in line, 1uF in line, 90 ohms between plus and minus
burst decay with 40db headroom
same type driver but without self adhesive foam tape on the backside of the piezo disc
burst decay 40db
damping the piezo element itself seems to work but it takes a little bit efficiency away
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ksn1016 driver from post 91 remeasured with 1x alu foil and back cavity damping with fine medical cotton wool
lower frequency response is raised from 3khz to 4khz due to stiffened cone. (Glue was methylcellulose - glue for wallpaper). But burst decay now looks much better.
This is mainly due to back cavity damping which is most effective.
Back cavity was not intensely stuffed as only this tweeter type from the ones I have allows to lift a little bit the paper cone on the side to just put some wadding around the piezo disc with a screwdriver.
lower frequency response is raised from 3khz to 4khz due to stiffened cone. (Glue was methylcellulose - glue for wallpaper). But burst decay now looks much better.
This is mainly due to back cavity damping which is most effective.
Back cavity was not intensely stuffed as only this tweeter type from the ones I have allows to lift a little bit the paper cone on the side to just put some wadding around the piezo disc with a screwdriver.
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ksn1005 from post 89 1x alu foil - no added damping due to unreachable back cavity without desoldering the leads.
Like in previous post - piezo is directly driven by the amp without crossover
alu foil tweak with this non damping glue cannot damp the resonances (but changes the sound however in a favourable way in my ears).
Only damping back cavity or damping the piezo disc itself or using dsp to tame the resonances or use well made lcr analog filters can tame /modify them.
Like in previous post - piezo is directly driven by the amp without crossover
alu foil tweak with this non damping glue cannot damp the resonances (but changes the sound however in a favourable way in my ears).
Only damping back cavity or damping the piezo disc itself or using dsp to tame the resonances or use well made lcr analog filters can tame /modify them.
ksn1005 no name driver type from post 90 with "small screws" 1x alu foil - no back cavity damping due to unreachable back cavity without desoldering the leads. No crossover
