davidsrsb
pfm Member
A well setup mid-fi deck can easily sound better than a badly sorted super-deck. Judging from reviews on Stereophile, some of the latter require almost continuous maintenance by skilled technicians to work right
Speaker cone movement on vinyl
- Thread starter Geoff101
- Start date
jamesd
pfm Member
Want to hear something weird?
I had a NAD integrated amp and a Parasound phono stage. I got the cone flapping you're talking about
I replace the Parasound with a Cambridge Audio phono stage with a rumble filter. Problem solved.
Then I replace the NAD and Cambridgr with a Brio-R (no rumble filter that I'm aware of?) and the problem is still gone. Nothing else changed. I don't get it
Hi there Geoff101: and good to see that you seem to have it sorted.
Although the Brio-R doesnt have a switch marked rumble filter, it looks like it still filters out subsonic grudge (I like that word, I hope you dont mind if I use it too).
A good phono stage should incorporate some type of sub sonic filter so that it doesnt pass on any sub-sonic noise generated by arm / cartridge compliance miss-match issues. It is always desirable to eliminate compliance matching issues at the source but it is not always possible to eliminate it entirely. A badly warped record can excite resonances in the best of arm/cartridge combinations.
As a side issue, historically rumble filters and Sub sonic or warp filters are two different types of filters. Rumble filters operate at the bottom octaves of the audible band width to filter out audible turntable rumble associated with noisy platter bearings and motor noise. A sub-sonic or warp filter operates at a much lower frequency range that is below the audible band width Its effect should not be audible other than eliminating the wild speaker cone movements described above.
LPSpinner
Although the Brio-R doesnt have a switch marked rumble filter, it looks like it still filters out subsonic grudge (I like that word, I hope you dont mind if I use it too).
A good phono stage should incorporate some type of sub sonic filter so that it doesnt pass on any sub-sonic noise generated by arm / cartridge compliance miss-match issues. It is always desirable to eliminate compliance matching issues at the source but it is not always possible to eliminate it entirely. A badly warped record can excite resonances in the best of arm/cartridge combinations.
As a side issue, historically rumble filters and Sub sonic or warp filters are two different types of filters. Rumble filters operate at the bottom octaves of the audible band width to filter out audible turntable rumble associated with noisy platter bearings and motor noise. A sub-sonic or warp filter operates at a much lower frequency range that is below the audible band width Its effect should not be audible other than eliminating the wild speaker cone movements described above.
LPSpinner