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Grado modders go Magnum
Apr 6, 2016 at 7:08 AM Post #4,036 of 4,994
Does anyone know the diameter of V6 driver?
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konstantin690 said:
 
46mm
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...So I am a bit late to the Franken-Grado party and am working my way through various threads.
 
According to one poster "I called Grado to ask.They told me that only three models (RS1e, PS1ke, & GS1ke) are 50mm and all the rest are 44." Does this mean that if I wanted to build some cans with 46mm V6 drivers I would not be able to just replace stock drivers, including the "e" series, keeping the stock cups?
 
I realize that I would probably want wooden or aluminum after-market cups anyway but I am just trying to get the general picture of what other folks are doing and why...
 
I have some Spirit Labs full build cans on the way. I asked them what drivers they use and they said Grado "e" series. My guess then is that since all "e" series phones seem to use this same driver they probably buy some SR60e phones and then do their modding on the cups and cabling. Since they also make a "kit" for the "e" series with just the cups and anti-resonance tweaking materials my guess is that I could not use the V6 drivers with them?
 
Thanks for indulging my noob questions!
 
Best,
 
Paul
 
Apr 6, 2016 at 5:00 PM Post #4,039 of 4,994
mourip said:
   
...So I am a bit late to the Franken-Grado party and am working my way through various threads.
Click to expand...

 
Welcome to the club.  "You can check out anytime you want, but you can never leave."  -
smily_headphones1.gif

 
Apr 7, 2016 at 7:39 AM Post #4,040 of 4,994
konstantin690 said:
  I finally found the time to put the measurement rig back in service and shoot some measurements on the V6.
The V6 are press fitted mounted in RS1 clone mahogany cups.
All measurements are power based, not SPL based, driving voltage is 178mVrms (ie, ~1mW)
Driving amplifier has <0.1ohm output impedance and diminishing low distortion at 1mW/32ohm
Measurement microphone was recently calibrated.
 
The measurement rig in the "high-tech" isolation chamber (ie, an old closet internally lined with some left over acoustic foam from the studio
tongue_smile.gif
, works like a charm)
 

 
 
Our "heroes"
 
 

 
Measurement system (and sanity
tongue.gif
) check.
This is how a perfect CSD (Cumulative Spectral Decay) looks like.....
 

 
 
....and this is what a perfect Impulse Response looks like..
 
 

 
 
The measurements:
Impedance and Phase...
Measured with 100ohm output impedance...

 
 
Impulse Response...
 
 

 
 
Since these are DIY drivers often used with different ear pads, there are three Frequency Response curves, with S-cush (flats, not quarter modded) L-cush and G-cush...
 
 

 
CSD...
 

 
THD%
 
 

 
...and since there are two "players" in the DIY driver category, Frequency Response with the Ypsilon, overlaid for better comparison,
cups, ear pads, cables and headband are identical...
The common "bump" at ~2kHz is a RS1 cup generated "thingy"...
 


 Complete Ypsilon measurements are here.
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Constantin, would you be interested in doing another measurement of the V6, but this time instead of the ypsilon the stock Grado driver?
 
Apr 7, 2016 at 8:10 AM Post #4,041 of 4,994
therealmvt said:
   
Constantin, would you be interested in doing another measurement of the V6, but this time instead of the ypsilon the stock Grado driver?
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Yes, If someone willing to send me the drivers for the measurements, I do not have V6 or stock Grado drivers at the moment, I ended up only keeping the Ypsilons.
FWIW, both the V6 and Ypsilon measured better than any stock Grado that I've ever measured, the Ypsilon performs better of the three in CSD (no sharp ridges) and THD% (especially at low frequencies).
 
Apr 7, 2016 at 9:13 AM Post #4,042 of 4,994

Oh too bad, I'm not really willing to part with my SR60e drivers at the moment. For what it's worth, here's the innerfidelity measurements of the SR60i drivers in stock cups:
http://www.innerfidelity.com/images/GradoSR60i.pdf​ 
 
Based on these measurements, how would you say the V6 driver is better compared to the stock one?
 
Apr 7, 2016 at 9:43 AM Post #4,043 of 4,994
therealmvt said:
 
Oh too bad, I'm not really willing to part with my SR60e drivers at the moment. For what it's worth, here's the innerfidelity measurements of the SR60i drivers in stock cups:
http://www.innerfidelity.com/images/GradoSR60i.pdf​ 
 
Based on these measurements, how would you say the V6 driver is better compared to the stock one?
Click to expand...

 
You cannot compare measurements made on different setups, there's a thread on the subject.
Going further, it's very unlikely for the V6 or Ypsilon to find a "home" in stock plastic Grado cups and the cups used play a major role in the end result.
The V6 compared to stock Grado (i) drivers in RS1 mahogany cups had cleaner looking CSD plots (faster Decay times, less sharp ridges) and a tad better THD% profile.
 
Apr 7, 2016 at 10:12 AM Post #4,044 of 4,994
Apr 7, 2016 at 10:13 AM Post #4,045 of 4,994
konstantin690 said:
   
You cannot compare measurements made on different setups, there's a thread on the subject.
Going further, it's very unlikely for the V6 or Ypsilon to find a "home" in stock plastic Grado cups and the cups used play a major role in the end result.
The V6 compared to stock Grado (i) drivers in RS1 mahogany cups had cleaner looking CSD plots (faster Decay times, less sharp ridges) and a tad better THD% profile.
Click to expand...

 
I agree....enclosure is important. The biggest step up in sound for me, when modding Grados, has been moving from plastic to wood. Wood types make subtle differences, but going from plastic to wood is a lot more noticeable.
 
Apr 7, 2016 at 3:12 PM Post #4,047 of 4,994
mourip said:
   
...So I am a bit late to the Franken-Grado party and am working my way through various threads.
 
According to one poster "I called Grado to ask.They told me that only three models (RS1e, PS1ke, & GS1ke) are 50mm and all the rest are 44." Does this mean that if I wanted to build some cans with 46mm V6 drivers I would not be able to just replace stock drivers, including the "e" series, keeping the stock cups?
 
I realize that I would probably want wooden or aluminum after-market cups anyway but I am just trying to get the general picture of what other folks are doing and why...
 
I have some Spirit Labs full build cans on the way. I asked them what drivers they use and they said Grado "e" series. My guess then is that since all "e" series phones seem to use this same driver they probably buy some SR60e phones and then do their modding on the cups and cabling. Since they also make a "kit" for the "e" series with just the cups and anti-resonance tweaking materials my guess is that I could not use the V6 drivers with them?
 
Thanks for indulging my noob questions!
 
Best,
 
Paul
Click to expand...

 
Hi Paul, The size of the driver is 44mm but that does not include the cover/lens that protects the diaphragm. With the cover added the size is 46mm.
 
Apr 7, 2016 at 6:02 PM Post #4,048 of 4,994
javburg said:
   
Hi Paul, The size of the driver is 44mm but that does not include the cover/lens that protects the diaphragm. With the cover added the size is 46mm.
Click to expand...

Thanks. I appreciate the input.  Waiting for my Spirit Labs cans now. Recabled my 15 year old SR60s today with mogami neglex. Seem to have that bug again!
 
Apr 8, 2016 at 7:56 AM Post #4,049 of 4,994
mourip said:
Thanks. I appreciate the input.  Waiting for my Spirit Labs cans now. Recabled my 15 year old SR60s today with mogami neglex. Seem to have that bug again!
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The Spirit Lab cans are tempting, not unreasonable money either. I'm keen to see some pictures of a customers headphones and hear your impressions of the sound.
 
Apr 8, 2016 at 10:00 AM Post #4,050 of 4,994
Mine may be a week or more away as they come to the US from Italy but my buddy said that I can keep his for another week. They are broken in. Will try to get some photos and impressions soon.
 
Basically I like them a lot. Detailed and open with a deep sound stage and less fatiguing than the Grados I have tried.
 
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