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BAK wrote:
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Why Rumble Filters are bad |
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Drewan77 
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Joined: 25 May 2013 Location: Chester,England Status: Offline Points: 1544 |
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 Posted: 07 Mar 2016 at 4:05pm |
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Older than I once was, younger than I'll be
............................. Andrew |
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BAK
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Joined: 14 Mar 2010 Location: Kentucky, USA Status: Offline Points: 1831 |
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Posted: 07 Mar 2016 at 4:14pm |
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So if a cartridge has a manufacturers' spec of "17 cu" what does that mean?
What would that be equal to in " x 10-6 cm/dyne" ? or even in " µm/mN " ? |
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Bruce
AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way! |
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Richardl60
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Joined: 04 Nov 2014 Location: Yorkshire Status: Offline Points: 1475 |
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Posted: 07 Mar 2016 at 8:19pm |
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Couldn't agree more over low filters whether they be switchable or built in. As you say proper matching should avoid issues.
I do feel in the MP3 age a lot of people are accustomed to dialling out any meaningful bass, you only have to look at the LCD TVs although others will dial in silly bass with a sub to overcompensate. Wasn't aware of the phase shift argument does apply to High filters too? Richard |
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BAK
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Joined: 14 Mar 2010 Location: Kentucky, USA Status: Offline Points: 1831 |
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Posted: 07 Mar 2016 at 8:22pm |
A Vinyl Engine member replied saying "@ 10 Hz, 17cu = 17 x 10-6 cm/dyne = 17 um/mN ". They are apparently all the same ! Interesting ! Still I am not knowing what the "cu" unit means... Compliance Units maybe? Using that figure; The formula on: http://www.ortofon.com/support/support-hifi/resonance-frequency (my result = 8.8995 Hz ) Confirms the same answer as from Vinyl Engine's online calculator to within 0.01% or less difference : http://www.vinylengine.com/cartridge_database_tools.php (my result = 8.89 Hz ) I will take it as 8.9 Hz . Another trusted and experienced source advised me that the calculation results are always lower than the actual reality as found with the HiFi News test record using the lateral resonance test (on Side 2, Track 2 ). I think, I will have to run that test with a frequency counter to find out as I watch the cartridge lateral vibration. Edited by BAK - 07 Mar 2016 at 9:57pm |
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Bruce
AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way! |
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BAK
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Joined: 14 Mar 2010 Location: Kentucky, USA Status: Offline Points: 1831 |
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Posted: 07 Mar 2016 at 8:40pm |
All filters cause a phase shift. This is due to the fact that reactive components, capacitors and inductors, are not perfect... they have a changing phase lead or phase lag at differing frequencies. Examples: High filters will cause a phase shift up to 2 or 3 octaves below the -3dB frequency. Speaker crossovers are designed to crossover @ a frequency 2.5 octaves minimum above the tweeters resonant frequency. Input coupling capacitance combined with the input resistance are selected in a similar manner, to pass a frequency much lower than the lowest frequency needed to be coupled, usually 1/10th (to couple down to 10 Hz it would be designed for 1 Hz). |
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Bruce
AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way! |
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morris_minor
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Joined: 27 Mar 2012 Location: Surrey Status: Offline Points: 6197 |
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Posted: 10 Mar 2016 at 4:34pm |
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Bob
Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
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