Hi All!
Quite some weeks have passed by. Without any update to you - but not without any progress.
This is what happened till now (besides pandemic restrictions):
1. I established a complete open-loop test for power-amps as automated ngspice-script.
Open-loop in this respect means without NFB, but can include local feedback.
This test especially looks at built-in linearity, slew-rate, bandwidth and THD,
that comes with the amp-concept without any correction by NFB.
2. Based on the open-loop script I am now working on closed-loop test-script.
The open-loop tests were performed with 4 and 8 Ohm resistive loads only.
With closed-loop a simulated loudspeaker is added.
The resistive load characteristics are used to compare with available measured data.
With only a real bass-driver load the simulation is limited to <<10kHz. Above the simulation breaks due to convergence issues caused by instability.
So I need to extend the single bass model into either a 2/3-way crossover loudspeaker or a single wide-band loudspeaker model.
Both solutions make perfect sense to me.
As the proposal from this board have proven to be very helpful to extend my portfolio of power-amps,
I would like to ask the members of the board to give me some proposals for both multi-way and wide-band loudspeakers.
Otherwise I will pick from my own database.
If there is any additional closed-loop characteristic, that should be added to the list, please feel free to propose.
Would you be willing to continue supporting this project?
Thanks in advance
sepp2gl