[kyrill]

If you dont know already
http://www.audiocircle.com/index.php?topic=51941.0
they are really working i have 6 in house and ordered another 6 ( also for my video "department")
they also isolate yr (digital component) from the rest in yr system for a grand part
Topic: Official Felix board/kit group buy thread

[AKSA]

Hi Kyrill,

Many thanks!

I use these common mode chokes in my new Squeezebox power supply, and they work well.  They make almost no difference in the LF and Soraya amps however, at least, that was Paul's and my experience in NYC back in October last year.

However, there are many would say even if the improvement is marginal, it may be worth it.....

Cheers,

Hugh

[kyrill]

To be honest Hugh
I have not yet tried them on the AKSA
BUT
the improvement on the source CD player or transport/DAC is worth yr amps, no? 

[whubbard]

Right now i'm thinking of using a panamax 5400 for line filtration.
I'm going to be plugging my amps directly into the floor outlets, as I have heard that it is 'bad' to use line filters on amps...do you think its worth using these on my lifeforces? (seems like hugh says no).

I also have not opened my Panamax, so I could return it. Do you think that these will work better than the panamax for my source components.?

Thanks

[VYnuhl.Addict]

Hi WHubbard,


    I have found routinely in the past that line filtration has been much of a blessing on source components, Cd Player, DAC etc, as most mid market items do not address line filtering all too well before the rectification, there are often big sonic gains to be had with some good line conditioning, lower noise, cleaner imaging. As for amplifiers I have found line conditioning to be undesireable, fine with sources but an amplifier draws alot of current and this needs to be supplied upon demand, I have found conditioning ala interface between the amplifier to rob it of dynamics and vitality and believe it or not clarity!. The only filtering I prefer on the mains from hot to neutral is a 100nf x2 mkp cap and a 220k 2w resistor in paralell, Bryston uses this and it works very well to get rid of HF hash on the mains before the transformer without sacrificing any musicality...


Hope this helps
Colin

[AKSA]

West,

It's really difficult to know, unfortunately.  Line filtration has had its share of controversy, many refute  it, just as many swear by it.  There is no doubt in my mind it makes a difference in the US where the grid is low voltage and quite dirty, but there is not much hard evidence around.  I would be inclined to go with what you have for the moment as making your own filters for the many Aspen modules you have would be fairly involved, particularly as you already have the Panamax.  But Colin is on the money, it needs to be an exceptional filter indeed if it is to avoid robbing the vitality of the sound when used with Class AB power amplifiers.  Class A is a different matter, however.

I hope this helps,

Hugh

[kyrill]

The Felix is not just another line conditioner
is it an "open source" project heavily interactived by the "most" critical audiophile lovers

It has been listened to in many different ways and sounds very well.
For amps you have to choose a lower mH coil. I would buy them with the ämp" Miller coil
and if you hear a negative difference replace the coil with the Coilcraft and use it for a front end apparatus.
it will set you back 6-9 dollars and you can still use it in the house for TV or refrigerator
but the DC resistance of 0.0xxohm is really low and would likely not harm yr amps hunger for instantaneous power

[whubbard]

Hmm,
I think im going to get down and dirty on this one and go ahead and get them. I'm probably going to make a profit selling my panamax as I got it for $249 with free shipping, new in box. They usually sell for about $400 on ebay. 

It seems like they should work really well on my digital components, but I guess it will be trial and error on the amps. Would someone mind helping me out on what chokes to choose? I've made some guesses.

My components are:
Zune  (8117-RC?)
Rega P2 (8117-RC?)
NAD PP2 (8117-RC?) 
Sangean HD Tuner (.08A) (8117-RC?)
McIntosh MCD7009 (.18A) (8117-RC?)
GK-1M (0.17A) (8117-RC?)
1x (one side Orion ASP (.15A), one lifeforce 100 module (2A), two lifeforce 55 module (2A) ...its all in one box)  (4.15A) (8118-RC?)
1x (one side Orion ASP (.15A), one lifeforce 100 module (2A), two lifeforce 55 module (2A) ...its all in one box)  (4.15A) (8118-RC?)

Also, for the components with an outside power supply, like the NAD pp2, where do I put the filter? I would assume before the power supply, therefore, before the outlet in some cases, right?

Thanks for all the help!

EDIT: If im in the US do I need to use the Vishay/BC MKP, or can I just use the Vishay/Roederstein? Will there be a difference in sound?

[kyrill]

 

Hmm,
I think im going to get down and dirty on this one and go ahead and get them. I'm probably going to make a profit selling my panamax as I got it for $249 with free shipping, new in box. They usually sell for about $400 on ebay. 

It seems like they should work really well on my digital components, but I guess it will be trial and error on the amps. Would someone mind helping me out on what chokes to choose? I've made some guesses.

My components are:
Zune  (8117-RC?)  for all your non power amps i would advise the Coilcraft P3717A
Rega P2 (8117-RC?)
NAD PP2 (8117-RC?) 
Sangean HD Tuner (.08A) (8117-RC?)
McIntosh MCD7009 (.18A) (8117-RC?)
GK-1M (0.17A) (8117-RC?)
the poweramps i would  advise the Miller 8118-RC least DC resistance
1x (one side Orion ASP (.15A), one lifeforce 100 module (2A), two lifeforce 55 module (2A) ...its all in one box)  (4.15A) (8118-RC?)
1x (one side Orion ASP (.15A), one lifeforce 100 module (2A), two lifeforce 55 module (2A) ...its all in one box)  (4.15A) (8118-RC?)

Also, for the components with an outside power supply, like the NAD pp2, where do I put the filter? I would assume before the power supply, therefore, before the outlet in some cases, right? yes

Thanks for all the help!

EDIT: If im in the US do I need to use the Vishay/BC MKP, or can I just use the Vishay/Roederstein? Will there be a difference in sound? dont know which one sounds better i heard the the MKP ( the blue ones) and they sound musical

 

[AKSA]

West,

Kyrill's advice, based essentially on DCR and current rating, is spot on!

Cheers,

Hugh

[whubbard]

I might have myself confused, but since both the P3717-A and 8117-RC are both rated at about 3A, wouldn't I want the 8117-RC as it is 36mH vs the 25mH of the P3717-A?

[kyrill]

Ah yes but the Coilcraft   combines common and differential mode filtering in a single component

the diff mode is an advantage over the Miller 8117-RC as i understood it
but this would be a nice question to ask in that thread

[whubbard]

I see.

I'll ask and then post the replies here.