[preproman]

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For the record, I have never heard a B22 from SolderworksAudio. 

 
 
Pretty knowledgeable guy that SWA

 

[MacedonianHero]

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Pretty knowledgeable guy that SWA

He is. 

 

[justin w.]

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I do hear some hum with my GS-X on medium gain, so it could be the gain of 3? Before I bought my GS-X, I had Justin's second last GS-1 and with unity gain for low, it too was dead silent with IEMs.
 
No problemo. 

 
are you stacking the amp on top of the PSU?  that could be responsible 

 

[MacedonianHero]

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are you stacking the amp on top of the PSU?  that could be responsible 

 
Justin: Just to clarify, the hum is only with my most sensitive IEMs with the gain setting to medium. On low (unity) gain there is none...total blackness. With any of my headphones (past and present), there is zero noise floor...the amp is dead silent even on high gain. Definitely the best amp I've ever owned in this regard. 

 

[Rico613]

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are you stacking the amp on top of the PSU?  that could be responsible 

I was assuming there would be no hum at any gain / volume setting.  Am I wrong here?

 

[Solude]

Amplifiers amplify.  If there is noise on the input... noise on the output

 

[safeandsound1]

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are you stacking the amp on top of the PSU?  that could be responsible 

Is this really a big no-no?  I was planning to stack them to save space on my rack.  I figured that the two pieces of sheet metal between the transformers and amp should block out any transformer hum. 
 
I listen primarily to LCD 2.2's BTW so I may not hear the hum might not come across like it would in high efficiency cans.

 

[justin w.]

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Is this really a big no-no?  I was planning to stack them to save space on my rack.  I figured that the two pieces of sheet metal between the transformers and amp should block out any transformer hum. 
 
I listen primarily to LCD 2.2's BTW so I may not hear the hum might not come across like it would in high efficiency cans.

 
its not a big deal.  it can be seen on the measurements, but unless you're plugging in sensitive IEMs and turning up the gain you wouldnt hear anything.  and that's only if you're stacking them without any separation.

 

[El_Doug]

If youre listening to this amp via IEMs, and need to use anything above 0 gain, then the hum you are hearing is coming from your damaged ear drums, not the amplifier.  Seriously, do you guys have ANY idea how loud a gain of 3 into IEMs would be, even from a relatively low-voltage source!?!?

 

[verber]

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If youre listening to this amp via IEMs, and need to use anything above 0 gain, then the hum you are hearing is coming from your damaged ear drums, not the amplifier.  Seriously, do you guys have ANY idea how loud a gain of 3 into IEMs would be, even from a relatively low-voltage source!?!?

 
Very aware. The vast majority of tracks I have would cause at least a temporary threshold shift if not run the risk of real damage to hearing.  But I have some tracks that were mastered badly and are amazingly quiet.  I actually have to turn the volume up enough on my GS-1 to the point I can hear some noise in the passages where there is a pause in the music.  One of these days I will get around to tracking down the original recording files and remaster, but it's not something I listen to a lot so I haven't do this.  For all practice purposes though, it's unlikely that the volume will be turned up high enough to hear the noise.
 
--Mark

 

[Solude]

So how we doing?  Getting close to shipping?

 

[preproman]

Bout that time.  Amps burning in yet?

 

[Rico613]

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" . . . .  to the point I can hear some noise in the passages where there is a pause in the music. "  

 
I don't get anything like that on my current amp with the attenuator maxed out.  It is dead silent. 

 

[justin w.]

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I don't get anything like that on my current amp with the attenuator maxed out.  It is dead silent. 

 
I don't know what amp you have, but..the GS-X is lower noise.

 

[justin w.]

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Bout that time.  Amps burning in yet?

 
burning in (testing) has started tonight