![]() I would recommend teflon (nice sound but they're only available in a small number of sizes) or polystryrene (which come in lots of small values). The good news is that with this scale of resistors, the size of caps you need are small and therefore the cost is less for much higher quality types. The values of the resistors to use will depend on where you're putting it (ie, between components or between stages in a component) and larger is generally better as it presents the easiest load on what is driving it, however the values will be sensitive to what they're connected to (ie, what circuitry comes after the filter) so that's why you have to know where it's going before you design it. but, bearing in mind that the more you have the greater the impact on sound quality, so it's a tradeoff. each cap/resistor pair will give you 6dB/octave of filtering (which is shallow) so you'll likely want 4 pairs (to give 24dB/oct) or more. the values of the pair determine what frequency the high pass filter corner frequency is at. So, the basic structure of a filter the signal goes through a capacitor and then there is a resistor to ground following it. in ultra-fi fully active systems every 'task' (ie, a filter or a gain stage etc) will be in a separate chassis with individual power supplies etc. If option 2 isn't optimal, option 3 presents the best quality solution for the most cost. this will require the ability to understand the circuits though, so isn't for everyone If 1 isn't optimal, option 2 is good, and depending on how the equipment you have is built you might find there is a spot that already has a high pass filter (all valve equipment has them) that you could modify to suit your purposes. Option 1 is the cheapest, and if you put it after a piece of gear with a low output impedance then there shouldn't be a loss of sound quality - i'd investigate this option first. a high pass filter wouldn't present too much of a load (low pass filters present more of a load) so you are luckier here.ġ) make an 'inline' filter and put it inbetween two of your components (ie, between the pre-amp and power amp, etc)Ģ) modify one of your pieces of equipment to include one between its stages (most equipment will have several amplification stages)ģ) make a new piece of equipment with at least two stages and put the filter between them The issues here are that the filter will present a load to whatever device (amplification stage) is pushing the signal into it. So, a line level filter is the best option. Of the two, the line level is the only really practical one as a speaker level one would require caps that were enormous, and even if you don't consider a potential loss of audio quality, they'd be expensive. What you're talking about is putting a high-pass filter with a corner frequency of less than 20Hz into the signal path somewhere. ![]()
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