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The HeadAmp GS-X and GS-X MK2 Thread - Page 77

post #1141 of 3967
Quote:
Originally Posted by Mr.Sneis View Post

David, did you try with no inputs hooked up at all?  IE just the amp, power supply, and the phones.  Should help identify what's going on if it comes back with a certain source connected.

 

No I didn't try that Mr. Sneis, [ I'd prefer to write your first name ] but I'll do it tomorrow.

post #1142 of 3967
Quote:
Originally Posted by justin w. View Post

you need to unplug the XLR cables, otherwise you are amplifying source noise or potential ground loops in your setup

 

I'll start using my RCA's

post #1143 of 3967

^ I think what Justin means is that any interconnect will pick up noise (hum), and that then becomes amplified.  Try it without any interconnects to see if the noise is coming from the amp or from the environment.  Better interconnects should mean less noise I would think.
 

post #1144 of 3967

it's unlikely the interconnect is picking up low frequency noise.  it could be from the source (CD player, DAC)

HeadAmp Audio Electronics - home of the Pico and Gilmore amps.  Now with Audeze, Fostex, HiFiMAN, Sennheiser, and STAX.
Find us at www.HeadAmp.com

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post #1145 of 3967

. . . .  ok . . .  then . . . ph34r.gif
 

post #1146 of 3967
Quote:
Originally Posted by David1961 View Post

I even separated both units by over 3 feet, and there was still no difference. The interconnects I used were XLR's.

Using the volume knob as a clock, with no volume being 7 o'clock and full 5 o'clock, I first tried the se535's.

With no music playing and on the low gain setting, I started hearing a slight humming at about 12 o'clock which increased going to 5 o'clock. 

I didn't try the se535's on the other two gains because IEM's are supposed to be used mainly on low gain.

As I've said, I did hear a humming around 12 o'clock, but when I started listening to some music, the highest I could go was 10 o'clock, but only for a short time. If I was to listen at that volume all the time, I'd end up going deaf.

I was also using my main source.

 

I then tried my HD-600's and again there was no difference between using the mini rack and the amp section being on the top shelf. This time I used the HD-600's on the medium gain, and again with no music playing, I could take the volume knob  to full and I heard nothing. I then listened to some music and the highest I could go to was around 11 o'clock.

I did try the HD-600's on the high gain and humming came in at about 4 o'clock.

 

If anyone would like to do a similar test to what I've done, just make sure the music doesn't come on while the volumes on full. 

 

My experience:

 

PSU and GS-Xmk2 with 14 inch vertical spacing (of which 6" is a powered off power amp)

With source disconnected, Westone ES5 dead quiet with unity gain and maximum volume

With source connected, Westone ES5 dead quiet 8 notches below max, around 3oclock with starting position being 7oclock

With source connected, HD800 dead quiet on high gain, volume at maximum.

 

PSU and GSxmk2 with 4" separation and stacked on top of each other... same result

With source disconnected and connected, Westone ES5 had noise on unity gain from the first notch up.  Very noticeable from 12oclock on.

With source connected, HD800 had no noise on high gain, maximum volume.

 

My normal "I am really paying attention to the music"  position is 11oclock high gain (HD800), 8-9oclock low gain (ES5) but that's with the DA-11 set around 30.  When being sent typical line level (Lavry at 40) I think anything beyond 12oclock, high gain with the HD800 would be damaging to hearing after long term exposure.

 

--Mark


Edited by verber - 5/2/13 at 10:30am
post #1147 of 3967

I have a curious question, does the Headamp GS-X mk2 can drive a HE-6 in balance mode?


Thanks.

post #1148 of 3967

I've tried my GS-X with the se535's but without the source, and found there was a very faint noise, but only when I turned the volume knob to 4 o'clock, which didn't increase when I turned the volume to full. This was using the low gain.

So it's obvious the main noise is coming from my source and or my interconnects.

I'm also going to do the same test with my BHSE.

However, if I was to listen to anywhere near the volume I got the humming when using my source with the GS-X / se535's, I'd be deaf in no time. 

post #1149 of 3967

there aren't any stax headphones anywhere near as sensitive as SE535.  even the in-the-ear Stax would be no where near as sensitive and they lack the 20dB+ noise isolation.

 

it's not surprising to be picking up hum from a source using SE535 as your test.  

HeadAmp Audio Electronics - home of the Pico and Gilmore amps.  Now with Audeze, Fostex, HiFiMAN, Sennheiser, and STAX.
Find us at www.HeadAmp.com

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post #1150 of 3967
Quote:
Originally Posted by preproman View Post

 

Invent more time  eek.gif

The millionaire and the beggar have the same amount of hours in a day, its what you do with your time that counts. So in business do what you like to do best and outsource the rest, if that is a option.  = unlimited time

post #1151 of 3967
Quote:
Originally Posted by justin w. View Post

there aren't any stax headphones anywhere near as sensitive as SE535.  even the in-the-ear Stax would be no where near as sensitive and they lack the 20dB+ noise isolation.

 

it's not surprising to be picking up hum from a source using SE535 as your test.  

 

I won't bother trying with the BHSE then.

I have to say, this very slight humming I heard using the se535's with just the GS-X, only happened when the volume was almost on full. There was no noise on any gain with the volume on full, when I used my HD-600's.

However, the only reason I did this test was to find out whether there'd be any noise when the GS-X was on the mini rack as opposed to the two units being somewhat apart, and there was no difference between the two positions.

 

 

 

                             

 

Sorry, but I enjoy taking photos. I've posted this photo to show why the mini rack for the GS-X, was made to the size I asked for.

 

My living room where my audio gear is, does look a bit rough, but I'm having it done up shortly.

 

The next photo I post, will be when I have the Aristaeus, that mini rack on the top shelf is for that amp. In that photo my living room should be done.

post #1152 of 3967

very nice David. 

 

And to those that think I was being pushy check out my previous posts. I stated over and over again that I am not in a rush and dont want Justin to feel rushed either. Before you insinuate that I am not polite do your research. ALso if you read the thread you see people comment on why the wait times are as they are and you will see that like Preproman said things can come up with suppliers that disrupt things. I have met Justin in person and I think he knows that I am just fine with waiting as long as it takes -- happily. But whats wrong with asking for status once in a blue moon?

post #1153 of 3967
Quote:
Originally Posted by verber View Post

My normal "I am really paying attention to the music"  position is 11oclock high gain (HD800)

 

Wow!  Time to go see an audiologist :P  I also listen at 11-1 with the HD800 but on LOW.  Especially scary given the DA11 wide open voltage output is 12Vrms to the PWD2 5.6Vrms output.

post #1154 of 3967

Dayum,  The DA11 is 12vrms wide open?  That's a lot.  I had the DA11 in mind as well.  Should be a very revealing stack with the GS-X mkII / HD800 combo

post #1155 of 3967

It's 2Vrms point is 40/56.  To be fair if it capped near 2V it wouldn't be a very useful headphone amp.

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