I know the loudness circuit is generally embedded in the preamp section of the amplifier system. But I wonder are there any passive devices that are installed in the passive crossover of the speaker and allow the speaker to perform as if it had a loudness compensation itself?
The device should have the ability to vary its resistance (inversely either current or voltage of the amplifier’s output) and be connected only to the woofer.
The device should have the ability to vary its resistance (inversely either current or voltage of the amplifier’s output) and be connected only to the woofer.
I'd consider a passive circuit in line with the preamplifier first if you dont want a dsp solution.
If you want a passive speaker level solution, it will need to be a manually selectted type of circuit with multiple resistance steps for varying degrees of compensation. It will be expensive in nature just because the components involved aren't small and need to handle alot of power. You could use a simple passive variable control to output a control voltage to progreesively select relay contacts for varying levels of bypassing the filtered frequency band giving you the bump in low end.
If you want a passive speaker level solution, it will need to be a manually selectted type of circuit with multiple resistance steps for varying degrees of compensation. It will be expensive in nature just because the components involved aren't small and need to handle alot of power. You could use a simple passive variable control to output a control voltage to progreesively select relay contacts for varying levels of bypassing the filtered frequency band giving you the bump in low end.
I’ve seen some passive crossovers equipped with a "thermistor" in the tweeter’s circuit. Its duty is to be used as a tweeter protector. I was, thus, curious to know if there are some other electronic devices that could vary their resistance inversely to the current (or voltage, which one?) of the power delivered from the amplifier. So that the DIYer could apply it in any tasks. I believe the cost of those devices be lower nowadays compared to the 80s and 90s.
Passives cannot amplify, so a passive circuit that "boosts bass" is actually "attennuate everything except bass". Thus, such passive circuit would mean that it attenuates everything always, except when you want to boost the bass then you'd actually reduce attenuation on the bass.
I hope ot makes sense. You should be able to whip up such filter in a vituixcad, but there is reasons why it is on the preamp, power loss and expensive parts. Cost is like hundred times less doing the same passive circuit before power amplifier than after, and it will cost electricity everytime you use it.