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I know active high and low pass filters are very accurate and generally didn't need a zobel circuit but would a passive high and low pass with a zobel circuit provide a more nature sound than actives or actives the only way to go?

Also for you tube heads I getting into circuitry mainly audio filters, power stabilization and pondering getting into diy amplifier building. I am wondering are there any tube pre amps that can convert high level input to low level output and what type of distortion would be seen at say 6v output Max on the low level line. I ask cause I thought I read around tubes produce distortion regardless a and if the case can it be lower.

Also I was reading about class a/d amplifiers but can locate one or a circuit diagram to compare with a class a and class d to see the implementation of hybrid setup

I know active high and low pass filters are very accurate and generally didn't need a zobel circuit but would a passive high and low pass with a zobel circuit provide a more nature sound than actives or actives the only way to go? Also for you tube heads I getting into circuitry mainly audio filters, power stabilization and pondering getting into diy amplifier building. I am wondering are there any tube pre amps that can convert high level input to low level output and what type of distortion would be seen at say 6v output Max on the low level line. I ask cause I thought I read around tubes produce distortion regardless a and if the case can it be lower. Also I was reading about class a/d amplifiers but can locate one or a circuit diagram to compare with a class a and class d to see the implementation of hybrid setup
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the sub amps are mono but my current door amps I have one is a Timpano tpt500.4d and my rockford is a 300x4.ab and I plan to grab a 3@ class d 4 channels one for front/rear Mid-Bass, one front front/rear Mid-Range and one for front/rear Tweeters ill use 2 class d mono blocks for subs. im just pondering how to make a lineout converter that has a amplifier attached to the signal raising the voltage to 6v preferably but upto 7.5 cleanily as i am seeing alot more amplifers with much higher input headroom then ever before. im basically dreaming up a super nice ass LOC and rca voltage amplifier all in one.

now i think on it the lineout converter can be the high level input of a amplifer, use the tube for the preamp of the amplifier boosting the rca signal outputs it powers.