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Matrix M-Stage amp review: simple, cheap, and excellent. - Page 256

post #3826 of 4904

If you dig back about 5 pages, you'll see that I had the same experience using 1964Ears V.3s with this amp -- low hum when no music is playing, and during very quiet passages. It doesn't matter what gain the amp is set for, or what level the volume knob is set to -- hum is always the same.

 

It appears to be a feature of this amp. I picked an Op627, which didn't help.  Seems to be always there , but only noticeable with very sensitive phones (my 1964Ears are 117db/mW). Just loud enough to be annoying.

 

I ended up getting a RSA Shadow, which I love. 

post #3827 of 4904
Quote:
Originally Posted by LCMusicLover View Post

If you dig back about 5 pages, you'll see that I had the same experience using 1964Ears V.3s with this amp -- low hum when no music is playing, and during very quiet passages. It doesn't matter what gain the amp is set for, or what level the volume knob is set to -- hum is always the same.

 

It appears to be a feature of this amp. I picked an Op627, which didn't help.  Seems to be always there , but only noticeable with very sensitive phones (my 1964Ears are 117db/mW). Just loud enough to be annoying.

 

I ended up getting a RSA Shadow, which I love. 

 

Rolling in another Op Amp ain't gonna fix this, peeps.

It's the power supply design.

post #3828 of 4904
Quote:
Originally Posted by Chris J View Post

 

Rolling in another Op Amp ain't gonna fix this, peeps.

It's the power supply design.

Yep i agree on this one..i also think its a design thingie..i have same thing with my 337..lucky enough i dont use any iem's anymore, but powerhungry planars.biggrin.gif

post #3829 of 4904
Quote:
Originally Posted by Chris J View Post

 

Rolling in another Op Amp ain't gonna fix this, peeps.

It's the power supply design.

 

Yes, I didn't expect that it would fix the problem, so I wasn't surprised. I had ordered the opamp before I knew about the hum problem. It would have been silly not to try it since the opamp was already in hand, wouldn't it?

 

And I think it would have been silly to leave that data out when I was reporting my experience.

post #3830 of 4904

I received mine today and it appears I'll need a better DAC. Even at max. volume, the Fiio E7 doesn't do much. Laptop > E7 > M-Stage > HD 600.

post #3831 of 4904
Quote:
Originally Posted by Alexein Aner View Post

I received mine today and it appears I'll need a better DAC. Even at max. volume, the Fiio E7 doesn't do much. Laptop > E7 > M-Stage > HD 600.

 

Do much how? Do you mean that you don't get enough volume, or the quality is poor?

 

If it's the first, be sure to change the gain settings, second be sure to use the volume knob on the M-Stage.

 

If it's the second, it's most likely because you're double amping.

post #3832 of 4904
Quote:
Originally Posted by Taowolf51 View Post

 

Do much how? Do you mean that you don't get enough volume, or the quality is poor?

 

If it's the first, be sure to change the gain settings, second be sure to use the volume knob on the M-Stage.

 

If it's the second, it's most likely because you're double amping.

I'm assuming I'll have to crack this open to change the gain. How would I resolve the double amping issue (I was under the impression that w/o the E9 it acted as a DAC)?

 

Thanks for the info.

post #3833 of 4904
Quote:
Originally Posted by Alexein Aner View Post

I'm assuming I'll have to crack this open to change the gain. How would I resolve the double amping issue (I was under the impression that w/o the E9 it acted as a DAC)?

 

Thanks for the info.

 

Nah, gain switches are on the bottom, check the manual to see the gain levels (be sure to make both switches the same).

 

The E7 is a portable amp/DAC combo, and I'm not sure if you can just use it as a DAC without pairing it with the E9.

post #3834 of 4904
Quote:
Originally Posted by Taowolf51 View Post

 

Nah, gain switches are on the bottom, check the manual to see the gain levels (be sure to make both switches the same).

 

The E7 is a portable amp/DAC combo, and I'm not sure if you can just use it as a DAC without pairing it with the E9.

Doesnt the e7 has an unamped line out? That way u go around the internal amp..my hm602 for instance has a headphone connector and a line out connector..second connector bypasses the internal amp..i use that to connect it to my amp..sound was so much better! maybe the e7 has the samething?

 

another thing..when using a pc in front of ur dac..put volume on max on pc..and also max on dac..so u only control volume with the knob on the mstage..just a tip..biggrin.gif

 

concernin the gain...imho for the hd600 u dont need more then gain on 10db..the dip switches are under the amp..they look like the dipswitches on a pc motherboard...u can find manuals all over the net...good luck!


Edited by hifimanrookie - 3/22/13 at 3:18pm
post #3835 of 4904
Quote:
Originally Posted by hifimanrookie View Post

Doesnt the e7 has an unamped line out? That way u go around the internal amp..my hm602 for instance has a headphone connector and a line out connector..second connected goes around the internal amp..i use that to connect it to my amp..sound was so much better! maybe the e7 has the samething?

 

It does, but it's proprietary (the connector at the bottom in the middle), and as far as I know (I may be wrong), it only works with the E9 desktop amp.

post #3836 of 4904
Quote:
Originally Posted by Taowolf51 View Post

 

It does, but it's proprietary (the connector at the bottom in the middle), and as far as I know (I may be wrong), it only works with the E9 desktop amp.

MAybe someone can make an adapter for it?

post #3837 of 4904
Quote:
Originally Posted by hifimanrookie View Post

MAybe someone can make an adapter for it?

 

I actually just found this, it should do exactly what Alexein wants.

 

http://www.amazon.com/FiiO-L7-Line-Dock-Cable/dp/B004QVNS0S/ref=pd_sim_e_8

post #3838 of 4904
Quote:
Originally Posted by Taowolf51 View Post

 

I actually just found this, it should do exactly what Alexein wants.

 

http://www.amazon.com/FiiO-L7-Line-Dock-Cable/dp/B004QVNS0S/ref=pd_sim_e_8

Yep looks like it..thanks for helping him out.

post #3839 of 4904

I have dual OPA627 on DIP-adapter with two 3,55 kOhm resistors between from Stephen at lasercollection in my amp clone, and he tell me there should be no hum that I also experiencing.

I have an 24 stepped 50 kOhm volume pot and has placed the toroid in a separate box on the outside. I have also grounded the amp´s chassi to the wall outlets earth (as I assume it should be).

 

The humming/ buzzing is at the same level regardless to volume or gain settings. The headphones I´ve used is HD 600 and HD 800.

The sound should be better (lower noise and distiorsion etc) with lower gain settings, but at 0 gain, I got to have the volume at about 75% and with 10 db gain I will have the volume at 50 - 55%. May the sound be worser if having the volume to high, sit it may be better having a higher gain setting that will allow lower turned volume?

 

Wishing you all an Happy easter!

 

Regards: Mikael

post #3840 of 4904
Quote:
Originally Posted by mikaelmark View Post

I have dual OPA627 on DIP-adapter with two 3,55 kOhm resistors between from Stephen at lasercollection in my amp clone, and he tell me there should be no hum that I also experiencing.
I have an 24 stepped 50 kOhm volume pot and has placed the toroid in a separate box on the outside. I have also grounded the amp´s chassi to the wall outlets earth (as I assume it should be).

The humming/ buzzing is at the same level regardless to volume or gain settings. The headphones I´ve used is HD 600 and HD 800.
The sound should be better (lower noise and distiorsion etc) with lower gain settings, but at 0 gain, I got to have the volume at about 75% and with 10 db gain I will have the volume at 50 - 55%. May the sound be worser if having the volume to high, sit it may be better having a higher gain setting that will allow lower turned volume?

Wishing you all an Happy easter!

Regards: Mikael

Yes the chassis should all be grounded to the wall outlet's (earth) ground.

I'm not surprised that moving the toroid made no difference. Toroids do not leak much magnetic field.
But I am very surprised that you can hear the hum thru the Senn HD600.
Can't really comment on the HD800.

I wouldn't worry too much about the position of the volume control.
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