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Subsonic Filter |
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GrahamD
New Member Joined: 13 Feb 2015 Location: Auckland NZ Status: Offline Points: 34 |
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Thanks for the input guys.
I must admit I never considered the lack of damping provided by valve amp transformers. What value resistor do you suggest Graham to bring the turn over closer to 20Hz ? The records in question are not warped, in fact my Oracle Delphi has a record clamp, it seems to be recorded into the 'groove'. One of the culprits is a brand new pressing of Dave Gilmours Rattle That Lock. The first track on side one really gets the cones flapping. Cheers Graham |
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GrahamD
New Member Joined: 13 Feb 2015 Location: Auckland NZ Status: Offline Points: 34 |
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Well, in the absence of further advice I went ahead and changed the resistor value to bring the turnover closer to 20Hz.
I had a couple of 270k resistors available and according to the advice given these in parallel with the amps 100k should result in 73k which with the 0.1uF capacitors results in 21.8Hz with a 6db/octave slope. It certainly sounds fine to my old ears as I can't detect any difference in the sound switching it on or off but a noticeable reduction in cone movement at these low frequencies. I am very pleased with outcome as I only wanted a very simple and non-intrusive filter that I could activate when required with little or no impact on the music. Cheers Graham Edited by GrahamD - 25 Aug 2016 at 2:08am |
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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Well done!
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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