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In Reply to: RE: EAR 834P Clone Build. posted by Cougar on December 09, 2024 at 10:06:07
"I bought awhile back a Jim Hagerman iRIAA2 - Inverse RIAA Filter to speed up the break in process on my Phono preamps."When they cut the lacquer they apply an RIAA filter that cuts the bass and boosts the highs. We have inverse RIAA filters in our phono preamps that cuts the highs and boosts the bass to get everything back to flat.
The product that Jim sells is a RIAA filter.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 12/16/24Follow Ups:
...and this morning I do see your point. Just to be clear though, your 'nit' is with Jim Hagerman's terminology in naming his filter, and not with Cougar's repeating of it, correct?
Well, both. I mean if you don't know you don't know but this one is pretty obvious. I see no point in repeating someone else's mistake so I think Cougar should take some responsibility.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Tre, I just repeated what was on his website and just wanted share with the guys here if they are breaking in any new Phono preamps, that "FILTER" helps out big time.
More than using it for break in, it can be used to check the accuracy of the phono pre if you are confident with the accuracy of Jim's product. Pink noise and a spectrum analyzer and, if both are right, you should see a straight line.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
connected from after the Streamer > Filter > Phono Preamp > Preamp. I listen off and on for about 4 days and by the last day, it was sounding really nice and just like I was playing the streamer through my tube DAC. So I guess his filter works pretty good. This why I was sharing my experience with and recommending it.
...the real bastardization started back in the 1950s by whoever was responsible for first naming the RIAA curve filter in phono preamps a filter, rather than an "inverse filter".
Electronics and our hobby have more than a few of these, which can be quite confusing at first, at least until we accept them "as is". Fixed bias of many tube amp's output tubes is anything but fixed, for example. I'd have called it "user adjustable bias" but then I'm not in charge of such things.
One of my personal pet peeves is the term monoblocks, or the more pretentious French 'monoblocs' which some guys write. They're mono amps, thank you very much, but again, I'm not in charge. I find that adding "Blocks" is block-headed, but I'm sure not going to swim against that tide of of tradition every time I see someone write 'block'.
You simply repeating the name of what Jim Hagerman calls his product was acceptable, in my opinion. Hagerman naming his filter "inverse", while technically incorrect in the truest sense, is also correct in that it's the inverse of the inverse filter inside every modern phono stage.
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