SmokedBurger
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On my unit vocals are abit blown out? though it could be the cartridge.
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Fosi Audio Box X5 Phono Preamp Review
- Thread starter amirm
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Which cart are you using?
The Fosi sounds towards the bright side, at least with AT carts of the VM series and tends to brighten my M75 Shure too.
I think this could be due to capacitance, the lower the brighter is the sound, and I guess this box has a pretty low value.
The Fosi sounds towards the bright side, at least with AT carts of the VM series and tends to brighten my M75 Shure too.
I think this could be due to capacitance, the lower the brighter is the sound, and I guess this box has a pretty low value.
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Not quite, as with subjective evaluation lowering the L versus C resonance with increasing C, damped by R, would increase the perceptibility, making the „sound“ brighter.
I was just about to write a little spread sheet for evaluating the infamous equivalent input noise current from noise output with two different input generator resistors. Not only that it was pretty useless considering the surface noise of even the best, new records. But I also wonder if there is a real desire to replace the mysteries, that keep the topic of optimizing vinyl playback alive. There‘s so much ‚character‘, from imperfections, in the vinyl technology, one has to embrace it with true love, not strangle it with cold hearted analysis. Keep on!
Not quite...
Here we're taliking about the contribution of the phono stage.
The cart, the tonearm, the mat, the platter, even the cable, whatever you want... All are the same.
I own the MX Vynl as said before, and this one has a switch for capacitance.
If I set the AT VM95 at 50pF sounds very close to the Fosi, towards the bright side.
If I set it at 200pF (as AT suggests) the same cart sounds fuller...
So my guess is that this Fosi has a low capacitance, for sure lower than 200pF
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Not a general rule at all... It depends from the "starting point".
Above some values trebles are rolled off.
morillon
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;-)
(and it is constantly observed and measured... )
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morillon
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there is no shortage of literature on this subject...in a few clicks...And this is referred to what?
Measuring what?
here hagerman...
but very well known... for decades...
If you wanted to experiment with the effect of capacitance on the phono input could you use a RCA "Y" adapter and connect one of these to the 2nd leg?
Temporarily, of course...
Temporarily, of course...
morillon
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This approach on y and "RCA plug" was marketed in the 70s ;-)
hence the interest of a minimum on the pre-phono side...see low capacitance cable...see shortcut just to help...
DB Systems-DB Systems DBP-6 Phono Capacitor Loading Kit-Turntable Accessories|Acoustic Sounds
Acoustic Sounds Audiophile Vinyl Records
store.acousticsounds.com
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morillon
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as much to limit the quantity of "metallic" material
;-)
Low capacitance makes sound flatter, if the cart is on the bright side of the spectrum (and it is the case of the AT)... It will sound bright.
If you go above the "turning point" could make it sound "fuller" or rolled off (depending on the point of view).
At 200pF it is spot on.
Just as I described above...
Read again my message...My guess is that this Fosi has a low capacitance.
Did you measure it?
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morillon
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no... perhaps if a version more complete and successful come..Low capacitance makes sound flatter, if the cart is on the bright side of the spectrum (and it is the case of the AT)... It will sound bright.
If you go above the "turning point" could make it sound "fuller" or rolled off (depending on the point of view).
At 200pF it is spot on.
Just as I described above...
Read again my message...My guess is that this Fosi has a low capacitance.
Did you measure it?
(juste for fun..i have many prephono )
for you
Post in thread 'Phono Cartridge Response Measurement Script' https://audiosciencereview.com/foru...esponse-measurement-script.41148/post-1461053
etc etc etc
Wrong terminology. Lowering the capacitance causes the output to roll-off sooner. Every cartridge presents a unique load to the phono input. The RLC of this load can be 'tuned' by changing parallel Resistor & Capacitor values. There will be some combination where the combined values yield an optimally flat response. Go BELOW that capacitance and it will sound dull. Too much and it will sound too bright (harsh, sibilant).
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