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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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[–] • 0 pt

It's not smoothness that you're worried about here. It's 12.6VDC. Period.

Your car's electrical system is rated for 13.8VDC. Your tubes want 12.6 (or 6.3 or 3 or 5 or 1 or whatever tube you've chosen.) Going above that range by too much will burn out the filament or stress it to the point where your expensive tube is now a glass bottle with some metal in it. Yes, a 12.6VDC tube can handle 13.8VDC, but that's the absolute upper limit. You're still short the plate voltages which you'll need to invert to get to the higher voltage. You can get inverters to do that, but solid-state stuff can induce noise. Your car's electrical system can induce a lot of noise as well, especially stuff with a lot of modern electronics. You're going to need a lot of filtering and shielding to do this right.

A word about what line-level means, when you say that it refers to a very specific thing. 1V @ 600Ω is typical line output, 10k is typical line input. You don't need more than that - I would usually limit my stuff to 2V when I did some audio work. I'd also usually tie the output of the preamp to 20k - that seemed to work well. Get too much of a mismatch and you get noise.

Are you looking to use 9 monoblocks for your finals? I assume you want mono output, and not stereo?

[–] • 1 pt

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.