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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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[–] • 1 pt

I'm curious to the application myself, RF is vastly different than a guitar amp vs car sub amp. Low impedence in car is .5 ohm, low impedance for guitar or home audio is 4 ohm.

Tubes indicate a desired coloring the sound for guitar and bass, while the rest seem car audio.

[–] • 0 pt

Tubes add noise when improperly run. If you bias it correctly, it outputs exactly what goes in, except bigger.

If you starve them or overdrive them, they start to add "color" as it's called. Great when you want a fuzz pedal, terrible when you want Bach to sound like Bach.

[–] • 1 pt

exactly why I'm asking for help lol. I don't want to add color only to use them to keep signal HiFi as its converted and let me increase voltage on the outputs by 3.5v maximum.

[–] • 1 pt

100% agree, that's why knowing the intended application is critical.

[–] • 0 pt

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.

[–] • 0 pt

this is for a car audio setup. I want to build a Line-Out that uses tube technology to convert the speaker line impedance to RCA's while also getting finer voltage adjustment and can increase voltage from factory 4v to a crisp 7.5v without distorting as my last 5 LOC's would distort the signal if I increased the voltage above 4.5 volts. if I increase RCA voltage my amps will best realize rated power and produce a cleaner signal if RCA voltage is maximum amp can input which mine are 6v which gives a cleaner signal since you don't need much gain at all to realize power.