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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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i dont run low impedance speakers like .5, 1 ohm speakers I like 4/8 ohm DVC subs and svc 4/8 ohm for other speakers. higher impedance produces much better sounding and responsive drivers. those that use low impedance for subs is for daisy chaining 12 18"s in a TAHOE or some other dumb shit you can think of. I like studio quality but at much stronger levels. I don't want it concert loud anymore but a nice small gig or dive venue is respectable. I'm going full IB with my Subs and Mid-Bass woofers, rear subwoofer will be set in rear right corner of truck cone firing through cabin, along with all equipment so I still have 60% of rear cabin. front sub bass will be a 8' mounted cone through floor on passenger side. will be 1 6.5" mid-bass woofer on each side in floor kicks with cone through floor, tweeters and 4" Mid-range will be mounted in dash with midrange 30% on axis and tweeter same.