With current drive, the frequency response will have a peak at the driver's resonance. This can be surpressed by mechanical damping or a passive circuit in parallel to the driver that keeps the impedance flat.
The Linkwitz transform circuit was probably derived with voltage drive in mind. Is there a formula for current drive?
Regards,
Eric
The Linkwitz transform circuit was probably derived with voltage drive in mind. Is there a formula for current drive?
Regards,
Eric
If you have the equations for voltage drive, you just have to substitute the driver's mechanical Q at all places where you would normally have its total Q.
Well, almost too simple to be true! Let's have a look.
- infinite output resistance will let Q_eb become infinite
- remaining Q_b = Q_mb
- assuming Q_e is frequency independent, f_b does not change
- frequency response in current drive is determined mainly by impedance which is dominated by Q_mb which the Linkwitz circuit corrects for
=> seems to be correct!!!
- infinite output resistance will let Q_eb become infinite
- remaining Q_b = Q_mb
- assuming Q_e is frequency independent, f_b does not change
- frequency response in current drive is determined mainly by impedance which is dominated by Q_mb which the Linkwitz circuit corrects for
=> seems to be correct!!!
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