The grey graph line is related to the phase, but I'd like to understand the blue line if someone can help here ;)
- @ below 120Hz it shows 20dB
- @ 1kHz it shows 24dB
- @ 1,5kHz it shows 73dB
- @ 5kHz it shows 0dB
where the higher the f the higher attenuation
Three questions :
1: why is there such a high gain @ 1,5kHz (the lower the resistance, the higher the current, the lower is the peak) - is this due to the resonance frequency ? How to get rid of it ?
2: why isn't the start / base not 0dB (it shifts up the higher the amplitude is set, but Im only interested in the relative value, hence question 3)
3: is it possible to just subtract 20dB from every value to bring the baseline to 0 so that eg 1kHz would become 4dB ?
Sorry if the question seems basic (or stupid) to you experts, just puzzled with this and eager to understand.
