Because the records were warped and scratched? O.k. but at what frequency does rumble & scratch occur? If it is occurring outside the audible frequency band why design a rumble & scratch filter at 10hz to 10khz? Its just that it sounds like everything has been blanketed. Especially the truncated highs. Could one get away with a 20h to 20khz hi/low cut and still protect against rumble & scratch?
Vinyl record warp occurs over a range of frequencies centered (moderately strongly) on 4 Hz. Typically. Usually. Sorta.
All bets are off for shellacs, but they're a world unto themselves.
All good fortune,
Chris
All bets are off for shellacs, but they're a world unto themselves.
All good fortune,
Chris
I used to use the scratch filter to overcome from blowing the tweeters when cranking the volume too high ! Same for rumble , to prevent over-excursion of the cones .
So it was a limit for the drivers when operating in nearly full distortion !
Nowadays the power had lifted and so driver's capability of sustaining short /long term power , and including digital media in the mix . So you can dial whatever slope and point
you need .
So it was a limit for the drivers when operating in nearly full distortion !
Nowadays the power had lifted and so driver's capability of sustaining short /long term power , and including digital media in the mix . So you can dial whatever slope and point
you need .
Rumble can be as low as 0.5Hz (record warp) or up to 10-20Hz if you have a turntable bearing problem or a worn motor. In between you have the arm-cartridge resonance which could be 5-15Hz, depending on how well matched they are. Rumble filters could be anywhere between 10Hz and 100Hz depending on the quality of your turntable.
Scratch filters could be anywhere from about 5kHz upwards, again depending on the quality of the system and how clean you keep your records. Not much point in a 20kHz scratch filter because it only removes things which most people can't consciously hear anyway.
Scratch filters could be anywhere from about 5kHz upwards, again depending on the quality of the system and how clean you keep your records. Not much point in a 20kHz scratch filter because it only removes things which most people can't consciously hear anyway.
had this doubt and rather than start a new thread I thought I would piggy back my questions here. It also shows I have been searching for answers and reading up lol.
The other day I purchased a 3 way cross over from the junk yard. I have word out in the scrap yard. And they call me when they find intresting heat sinks and crossovers in the junk.
This 3 way cross over has something I have seen for the first time.
Here is the sketch I made of it. In Xsim
1. Look at C3 and C4. I have not see this in many designs. So I started to read up on this its called a subsonic cap filter.
It says it helps speed up the working of the larger cap. Could somebody explain in simple english how this works ? I can see the impact in the simulators which seems to treat it just as if your adding two caps in parallel
2. My Second question is the need for Subsonic filters on LP Players. Yes I know warped LPs result in rumble at about 1-10 Hz.
But I have been studying on RIAA standards. Is it not part of the standard to subtract huge amounts of signal anyway in the 1-30 Hz range if the RIAA standard is already doing this why do we need a subsonic filter ?.
The other day I purchased a 3 way cross over from the junk yard. I have word out in the scrap yard. And they call me when they find intresting heat sinks and crossovers in the junk.
This 3 way cross over has something I have seen for the first time.
Here is the sketch I made of it. In Xsim
1. Look at C3 and C4. I have not see this in many designs. So I started to read up on this its called a subsonic cap filter.
It says it helps speed up the working of the larger cap. Could somebody explain in simple english how this works ? I can see the impact in the simulators which seems to treat it just as if your adding two caps in parallel
2. My Second question is the need for Subsonic filters on LP Players. Yes I know warped LPs result in rumble at about 1-10 Hz.
But I have been studying on RIAA standards. Is it not part of the standard to subtract huge amounts of signal anyway in the 1-30 Hz range if the RIAA standard is already doing this why do we need a subsonic filter ?.