with sealed (and some aperiodic) boxes, a single series impedance notch filter can tame the major impedance peak. I'm totally ignorant on current drive potential benefits so would like to know what one might expect including subjective opinion for sonic improvement with a chip amp set as transconductance amplifier.
below is sim with Fane's 12-250TC and source impedance of 270 ohms.
the impedance notch filter keeps the system from peaking at resonance
below is sim with Fane's 12-250TC and source impedance of 270 ohms.
the impedance notch filter keeps the system from peaking at resonance
Freddi, i am working on a tutorial & discussion that will be germaine to your quest. Stay tuned.
The trick David showe dyou should be good for some interesting play.
One might be able to get an idea of the actual change in SPL as the Rout goes up with a know R. Only useful for designing LF bits, one also has to worry about impedance interactions with speakers that have non-flat impedance due to XOs or rise in HF impedance.
dave
The trick David showe dyou should be good for some interesting play.
One might be able to get an idea of the actual change in SPL as the Rout goes up with a know R. Only useful for designing LF bits, one also has to worry about impedance interactions with speakers that have non-flat impedance due to XOs or rise in HF impedance.
dave
hi Dave - that sounds great - I'm so glad you "made it" and getting better - (I did a month in a hospital recently)
A good and interesting question. Due to the largely unpredictable nature of the driver's electrical characteristics, I hope acoustic measurements are going to play a large part in this discussion.
The biggie is low current draw = less Vc heating = more linear performance and of course with passive XOs they ideally need a flat impedance.
Re OTA, after reading this, it in theory has the best of both CC and voltage amps, i.e. the CC's matching impedance capability for max power efficiency transfer, but with the high power, etc., capability the voltage amp allows at reasonable size/cost: Operational transconductance amplifier - Wikipedia
For sure, if I had the $$$ for a Pass OTA, it would be the ideal type amp to drive vintage speakers or modern variants tuned for matching impedance SET, PP tubes.
GM
