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MrSpeakers Alpha Dog Revealed! - The World's First Production 3D-Printed Headphones - Page 197

post #2941 of 7683
Quote:
Originally Posted by jerg View Post
 
Quote:
Originally Posted by mrspeakers View Post
 

Now that we're starting to catch up, here is the often requested frequency response.  This is not an average, it is not smoothed, and it's a single point measurement (vs an average of multiple passes for one phone) for our master reference headphone.  We tune our phones to be within +/-2dB of this curve.

 

As usual, the rolloff that starts at about 1.5K is characteristic of our headphone measurement system, and actually this represents linear.  What's going on in the plot above 5K is very random based on micro adjustments of the phone on the test fixture.  

 

I always hesitate to put plots out as many people expect headphone measurements to look like ruler flat speaker plots, but the reality is above 1.5K peaks and troughs are part of "flat" measurements.  

 

Hey Dan, is there any form of compensation applied to the measurement here?

 

 

Regardless, the pattern definitely looks very similar to other MD measurements, except in this case the midrange with AD seems much more in-line with the rest of the FR (MD's midrange had a bit of a hill around 800 Hz with purrin's measurements), and overall sweeping balance seems better, though to really see we'd need side-by-side comparison either all with your measurements or another sources.


Indeed they are. I can't quite match the graphs but they look quite similar. Yay variations in measuring headphones!

post #2942 of 7683

We match as tightly as we can but there are always going to be variations.  It's just the way things are; even resistors and capacitors have variations, like 1%, 5%, 10%, etc.  Vacuum tubes, transistors, you name it.  

 

ALL headphones and speakers have variations from Left to Right and unit to unit, mostly due to the drivers, but many factors, from pad to variations in clamp force all can have subtle (or not-so-subtle) effects as well.   I am not aware of any other vendors disclosing their tolerances, but I know ours are pretty tight specs.  Sometimes it takes hours to get a phone in spec, other times it just can't be done.

post #2943 of 7683
Quote:
Originally Posted by miceblue View Post
 


Indeed they are. I can't quite match the graphs but they look quite similar. Yay variations in measuring headphones!

Might be best if you just post them side-by-side, overlaying them without aligning the frequency axis would just throw people off.

post #2944 of 7683
Quote:
Originally Posted by mrspeakers View Post
 

We match as tightly as we can but there are always going to be variations.  It's just the way things are; even resistors and capacitors have variations, like 1%, 5%, 10%, etc.  Vacuum tubes, transistors, you name it.  

 

ALL headphones and speakers have variations from Left to Right and unit to unit, mostly due to the drivers, but many factors, from pad to variations in clamp force all can have subtle (or not-so-subtle) effects as well.   I am not aware of any other vendors disclosing their tolerances, but I know ours are pretty tight specs.  Sometimes it takes hours to get a phone in spec, other times it just can't be done.


Dan, thx for the info.  It totally makes sense.

post #2945 of 7683

I am not sure if I have asked this or someone else has, but when upgrades do come around, will we be getting the same retail packaging (and headphone stand) and Styrofoam (this is important :) )

post #2946 of 7683
Quote:
Originally Posted by eac3 View Post
 

I am not sure if I have asked this or someone else has, but when upgrades do come around, will we be getting the same retail packaging (and headphone stand) and Styrofoam (this is important :) )

 

Absolutely.

post #2947 of 7683
Quote:
Originally Posted by mrspeakers View Post
 

We match as tightly as we can but there are always going to be variations.  It's just the way things are; even resistors and capacitors have variations, like 1%, 5%, 10%, etc.  Vacuum tubes, transistors, you name it.  

 

ALL headphones and speakers have variations from Left to Right and unit to unit, mostly due to the drivers, but many factors, from pad to variations in clamp force all can have subtle (or not-so-subtle) effects as well.   I am not aware of any other vendors disclosing their tolerances, but I know ours are pretty tight specs.  Sometimes it takes hours to get a phone in spec, other times it just can't be done.

Ditto Dan!!

Thanks for this intel.

 

Apparently my Alpha's should arrive TOMORROW!

I feel like an audio junkie - can't WAIT to get lost in their magic again!!

 

I'll be doing a full review, for either PFO or Part-Time Audiophile,

gotta figure that out.  

 

But I'm PUMPED!

 

They sounded terrific at CanJam of course, and I had to listen, even though I'm getting a pair,

because I needed my Alpha fix!

post #2948 of 7683

Miceblue, that Alpha Dog graph has a y axis of 90db, whereas purrin's graph of the MD has a y axis of 30db.  It could possibly be that if the same graph by purrin were measured with a 90db window it could make the MD look even flatter than the AD.  90db is a considerably large y axis.

post #2949 of 7683

You can't really compare our measurements directly, they're not apples to apples.  I *think* Purrin applies a compensation curve, we do not.

post #2950 of 7683

Here is Purrin's Mad Dog Measurement if scaled with a 90db Y axis vs Dan's Alpha Dog 90db Y axis window.

 

I still wouldn't compare the two though, Purrin's compensation is based off a pair of neutral measuring speakers, so what's flatter on his graphs is flat like a speaker measurement.  Something truly comparable would be a measurement by Dan of the MD and then the AD using the same measuring method and Y window.  (The purpose of this graph wasn't to compare the two headphones, but to show that 90db window can make things look very flat)

 

 


Edited by TMRaven - 10/15/13 at 6:43pm
post #2951 of 7683

Like I said, they can't be compared except for qualitative stuff (e.g. certain patterns in the FR, like the twin humps around 600 Hz, hump at 4kHz, sharp dip at 9kHz, etc). For real comparisons there needs to be measurements from the same system (either Dan's or purrin's).

post #2952 of 7683
Quote:
Originally Posted by mikemercer View Post
 

 

Apparently my Alpha's should arrive TOMORROW!

 

 

If you haven't already made your sacrifice, can I offer some suggestions?  :biggrin: 

post #2953 of 7683

Are the AD measurements directly comparable to these previously published measurements for the MD?

post #2954 of 7683

If the two are used with the same amount of compensation/no compensation then here you go:  

Also it seems as though the MD one was smoothed a bit whereas the AD isn't.  I'm sure the smoothing would get rid of the little valleys around 600hz, 1000hz and the artifact at 9khz.

 

Graph still might be a bit off as I didn't really account for the difference in aspect ratio of the graphs when I scaled.

 


Edited by TMRaven - 10/15/13 at 6:49pm
post #2955 of 7683

Really quick update...

 

I tried them for about 15 minutes this morning, and absolutely no bass energy below about 40 Hz.  When Dan says make sure you have a seal, REALLY MAKE SURE YOU HAVE A GOOD SEAL!

 

I pm'd Dan, and he walked me through the seal.  I actually had them too loose, and once I tightened or shortened them a bit, I had a good clamp.

 

I was able to play 'Elephant Talk' by King Crimson, DVD-A mastered by Steven Wilson.  I have one warning, what Dan writes about these is not hype.  These are possibly the most neutral headphones I have ever experienced.  The graph he posted, well, yes- that's what neutral sounds like.  Everything seemed proportional.  The mids have to be experienced, IMO.  Descriptions just won't cut it, at least not with my vocabulary.  Bass will definitely sound recessed, especially if one is used to my other less-than neutral cans.  But it is there, and I have not even tried to explore the limits of the depth.  So far I have about a half-hour with them, so take this all with the usual grain of salt.

 

Soundstage I'm not too concerned about yet, but the imaging is darn good.  I'll try out some classical and live material, and some binaural material in the next few days.  I also plan on using some EQ from JRiver with FLAC files and see what they sound like with a more U-shaped EQ, and how responsive they are to fiddling.  At this point, I do not intend to mess with the screw, at all.

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