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In the Forum: Didital Things
In the Thread: Saying goodbye to the digital crossover.
Post Subject: RL filters and AAPosted by KLegind on: 1/29/2010
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 Romy the Cat wrote:
Good link, Kris. What is missing in the link is the RL filters. The RC Low-pass filters are fine as the capacitors are not in the band-pass mode.  It is arguable what would be better – a subtractive shunting cap or a few miles of coil in the signal pass. The High-pass filters that Art Ludwig use- I do not like them and tend to use RL filters instead of RC filters. Look at the Milq’s 6Ch version and you will clearly see it.


Ouch, you touched a sore spot. I first came upon the idea of using line level RL filters on Audio Asylum. This is a bad f*cking place to learn anything (excuse my language). The RL idea was promoted as a alternative to active linestage filtering and as such a very useful concept. Now, here is where the skin of your face meets the road: This specific implementation was promoted by a follower of a certain "Tube-wrangler" personality that lives in the AA forum. This fella and his acolytes careen around the AA forum like some out of control dump truck leaving garbage everywhere. I have never seen such an amount of inane arguments about SET amps anywhere else (or shameless product placement either). Now would I really want to trust the advice of those unsavoury characters? I was sorely tempted to abandon the idea. Might give it a try if I get around to building that 2 stage 2A3 this spring.

Between pre and power amp it would need extra gain to overcome the dc resistance of the choke. I think I have a diagram of such a beast somewhere...

Kris  

** Oooops, sorry - I thought you meant LC filtering! I'll have a look at the Milq circuit***

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