Tube XO Schematics*
18_04_05
Heath XO-1
Marantz
Audio Research
Larson & Cretien
(bessel 2
nd
order) -- 7 kHz
Larson & Cretien
(bessel 4
th
order) -- 5 kHz
Both the above are also
here
1
st
order Butterworth
3
rd
order Butterworth
TubeCAD
aricle on
tube XOs
* the 1st 5 have been redrawn from maps found
here
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