I never fit subsonic filtering on any phono stage I build. I'm dead against it!
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I never fit subsonic filtering on any phono stage I build. I'm dead against it!
Surprised by that. Doesn't having to deal with the low frequency sludge put a strain on the amplifier?
Even if it only filters below 20Hz?
The only reason I'm surprised is because I don't know or understand the technicalities, just going off what I've read.
The lowest frequencies in music would be the 16Hz from pipe organ..... This coincides with the highest arm cart resonance frequencies. Can't remove one without the other! More generally, a filter at 20Hz would start to effect LF phase from about 200Hz down and if the filter turnover is at 20Hz it will probably be a touch down at even 40Hz. I find this noticeable.
The subsonics we would like to remove are just too close to the lowest bass frequency we want to keep at the end of the day, and the steeper we make the filter the worse in non linear phase, transient response and ringing the filter will be ;)
Some will counter with Doppler distortion and varying position of voice coil affecting speaker linearity.... but I know which compromise I prefer:) Bass always sounds lacking in ultimate extension and somehow just not quite right to me when a subsonic filter is in place.
Interesting info.
Once had a unit with subsonic filtering (switchable) I never liked it, finding that when the filter was on Bass seemed as gelded.
In truth I didn't keep that thing long as it wasn't overly good in any respect.
At least now I have some inkling as to the why.
Have you ever tried adding the Neumann constant to a phono stage? I tried years ago, but can't remember what the result was.
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