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| Headphone Amps (full-size) Discussion of desktop headphone amps. |
02-09-2008, 11:06 PM
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Headphoneus Supremus
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Join Date: Oct 2006
Location: Arizona
Posts: 3,262
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Quote:
Originally Posted by davve
Here's som pics! one of the chip got some soldering on it. I don't know if everything seems okay.
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Is that just resin that has heated up and ran?
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02-09-2008, 11:08 PM
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100+ Head-Fi'er
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Join Date: Dec 2005
Location: Sweden
Posts: 209
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Quote:
Originally Posted by mp101
Mines not behaving wel either, that aside, I did notice that if I push the preamp button now (to light up the Phone LED) the volume to my LittleDot MKV is adustable with the volume on the Zero, it didnt do that before, only since I have installed the LT1364's
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Mine did the same but with the stock opamps too. I don't think nothing is wrong.
__________________
Phones: HD650, HD485
Source: M-Audio 192, Zero Dac, Constantine+
Amp: DV332 (CV4010, Ulys 6S19P-V
Gone: HD595, DV336i
Last edited by davve; 02-09-2008 at 11:11 PM.
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02-09-2008, 11:18 PM
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100+ Head-Fi'er
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Join Date: Oct 2007
Location: Deep South Texas
Posts: 139
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Quote:
Originally Posted by Penchum
That's a new one for sure! What happens when you power off and power back up? Does it reset itself to normal behavior?
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I had posted that my unit was doing this when I first got it. If you hook up an separate amp to the RCA outs, then push the "Preamp" button to light up the green "Phone" light - you then can control the volume going out to your separate amp.
Penchum, I had agreed with you when you indicated that I just keep the volume knob on the Zero at minimum (zero) and let the external separate amp do the volume control. This is what I have been doing all along and it works fine.
So, for me, it has always functioned in this manner. I now have the 1469 in the DAC with 2 LT1361's in the headphone amps. 
__________________
Go ahead, follow that "Yellow Brick Road"... 'cause no matter where you go there you are.
Foobar2K (KS/FLAC)-> AV-710 (coax)-> COMPASS Dac/Amp (Earth HDAM in DAC)-> Gilmore Lite/DPS-> Senn HD650
Portable: Cowon D2 > CrossRoads MylarOne Ruby x3i
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02-09-2008, 11:25 PM
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Headphoneus Supremus
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Join Date: Oct 2006
Location: Arizona
Posts: 3,262
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Quote:
Originally Posted by edguetzow
I had posted that my unit was doing this when I first got it. If you hook up an separate amp to the RCA outs, then push the "Preamp" button to light up the green "Phone" light - you then can control the volume going out to your separate amp.
Penchum, I had agreed with you when you indicated that I just keep the volume knob on the Zero at minimum (zero) and let the external separate amp do the volume control. This is what I have been doing all along and it works fine.
So, for me, it has always functioned in this manner. I now have the 1469 in the DAC with 2 LT1361's in the headphone amps. |
OMG 
I am so sorry! What an idiot I was! When you told me that, I had my amp hooked to the Zero, so I pressed the phones, got a green light, and my amp was silent. I took that to mean it was "not connected", that is, until I just gave the Zero volume knob a twist!!
Here is what is happening. It behaves like this until you plug in another set of headphones into the Zero. As soon as you do this, it cuts off the pre-out completely. 
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02-09-2008, 11:30 PM
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Headphoneus Supremus
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Join Date: Oct 2006
Location: Arizona
Posts: 3,262
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As far as I can tell, having it in this "variable" output mode, seems clean and clear. I don't believe it will hurt anything and it actually is kind of nice, if your amp doesn't like the normal high output of the Zero. What do you think? This would help with using a portable amp as a desktop amp, for sure.
Last edited by Penchum; 02-09-2008 at 11:36 PM.
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02-09-2008, 11:31 PM
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Headphoneus Supremus
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Join Date: Oct 2006
Location: Arizona
Posts: 3,262
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Quote:
Originally Posted by edguetzow
I had posted that my unit was doing this when I first got it. If you hook up an separate amp to the RCA outs, then push the "Preamp" button to light up the green "Phone" light - you then can control the volume going out to your separate amp.
Penchum, I had agreed with you when you indicated that I just keep the volume knob on the Zero at minimum (zero) and let the external separate amp do the volume control. This is what I have been doing all along and it works fine.
So, for me, it has always functioned in this manner. I now have the 1469 in the DAC with 2 LT1361's in the headphone amps. |
Do you like this combination better than the others?
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02-09-2008, 11:45 PM
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Headphoneus Supremus
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Join Date: Oct 2006
Location: Arizona
Posts: 3,262
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Quote:
Originally Posted by mp101
Mines not behaving wel either, that aside, I did notice that if I push the preamp button now (to light up the Phone LED) the volume to my LittleDot MKV is adustable with the volume on the Zero, it didnt do that before, only since I have installed the LT1364's
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Quote:
Originally Posted by davve
Mine did the same but with the stock opamps too. I don't think nothing is wrong.
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I'm sorry, both of you guys. I should have understood this much earlier. No, I don't think anything is wrong. It has been wired this way and we just didn't know it was a "feature". Normally, there would be no need for this, but if you had a portable amp, that you wanted to use as a desktop amp, you could hook it up to the pre-amp outputs (RCA) and go into this variable mode and not overdrive the portable amp. I just tested my MK1 with it, and it was great to back down the output, so the volume control on the MK1 had some maneuvering room!
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02-09-2008, 11:46 PM
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100+ Head-Fi'er
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Join Date: Jun 2007
Location: Kent, England, UK
Posts: 145
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Quote:
Originally Posted by Penchum
As far as I can tell, having it in this "variable" output mode, seems clean and clear. I don't believe it will hurt anything and it actually is kind of nice, if your amp doesn't like the normal high output of the Zero. What do you think? This would help with using a portable amp as a desktop amp, for sure. |
Thats exactly what I thought, every time I listened to it (Zero) I plugged in phones, hit the button and turned up the volume, I never had phones in the MKV and the Zero at the same time.
I just thought that when the preamp button was on it reduced the volume to the phono out sockets, but all the time it was controlling the volume.
So i guess the statememt that it is a pre-amp is true. Its all good
__________________
eBay Feedback Link itsabitnutty
Source: iPods; Nano G1, Mini G1, Shuffle G1, 40GB G2, 40GB G3, iPhone 3g
DAC: Zero
I/C: TURBODock V8, TURBO DIABOLOUS V8, ALO CryoDock, ALO Cryo SXC 22G
Portable Amps:RSA Hornet, RSA Predator, RSA SR-71A Blackbird, RSA SP-51 Mustang, Go-Vibe V6 V6M V7, Corda Move, Headsix,XIN Supermicro (On Order), iBasso D1 & P2, HeadAmp Pico w/DAC, Little Dot MKV
HeadPhones:Senn HD520II, Senn HD650, 8ft Equinox Noir, Yuin PK1, Beyerdynamic DT770-Pro/80 Ohm, Westone 3
Owned: XIN Reference, Shure E5c's
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02-09-2008, 11:47 PM
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100+ Head-Fi'er
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Join Date: Oct 2007
Location: Deep South Texas
Posts: 139
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No problem, Penchum!
As far as the photos of davve's board, it is hard for me to tell. The resin is discolored (?) in the first photo. I don't like seeing the resin on the chips in the other pictures either. Could just be the photos.
davve, do the solder points look burned or otherwise unusual? It is hard for me to tell from the photos. Either they didn't clean up the board or the resin could be discolored from heat. Did you smell anything?
Also, this may be dumb question, but did you try a different set of headphones with the Zero? Maybe your phones (heaven forbid!) got fried instead of the Zero!
Stay positive and hope for the best! At least Lawrence responded to you rather quickly!!
__________________
Go ahead, follow that "Yellow Brick Road"... 'cause no matter where you go there you are.
Foobar2K (KS/FLAC)-> AV-710 (coax)-> COMPASS Dac/Amp (Earth HDAM in DAC)-> Gilmore Lite/DPS-> Senn HD650
Portable: Cowon D2 > CrossRoads MylarOne Ruby x3i
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02-09-2008, 11:54 PM
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Headphoneus Supremus
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Join Date: Oct 2006
Location: Arizona
Posts: 3,262
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The very bottom pic, the bottom chip, might be worth cleaning off to see if the surface of the chip shows signs of overheating (melting,smudging). It looks a little bumpy to me.?
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02-09-2008, 11:57 PM
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100+ Head-Fi'er
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Join Date: Oct 2007
Location: Deep South Texas
Posts: 139
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Quote:
Originally Posted by Penchum
Do you like this combination better than the others? |
Yes! So far at least! 
I tried the 1364 in the DAC position but the bass was boomy and formless - without structure or "loose". With the 1469, the bass is big but controlled and tight. It doesn't seem to affect the midrange either. Highs are more clear and defined for me too.
I will be listening to this for a while before trying the something else. Mind you, I am not using the headphone out as I am using my Gilmore. But the few times I tried the 1361's they were very comparable and almost as good for me as the Gilmore - but not quite!!
__________________
Go ahead, follow that "Yellow Brick Road"... 'cause no matter where you go there you are.
Foobar2K (KS/FLAC)-> AV-710 (coax)-> COMPASS Dac/Amp (Earth HDAM in DAC)-> Gilmore Lite/DPS-> Senn HD650
Portable: Cowon D2 > CrossRoads MylarOne Ruby x3i
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02-10-2008, 12:02 AM
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100+ Head-Fi'er
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Join Date: Dec 2005
Location: Sweden
Posts: 209
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Quote:
Originally Posted by edguetzow
No problem, Penchum!
As far as the photos of davve's board, it is hard for me to tell. The resin is discolored (?) in the first photo. I don't like seeing the resin on the chips in the other pictures either. Could just be the photos.
davve, do the solder points look burned or otherwise unusual? It is hard for me to tell from the photos. Either they didn't clean up the board or the resin could be discolored from heat. Did you smell anything?
Also, this may be dumb question, but did you try a different set of headphones with the Zero? Maybe your phones (heaven forbid!) got fried instead of the Zero!
Stay positive and hope for the best! At least Lawrence responded to you rather quickly!!
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What is resin? maybe resin is normal? I have my DV connected to my AP192 so my HD650 is working.
__________________
Phones: HD650, HD485
Source: M-Audio 192, Zero Dac, Constantine+
Amp: DV332 (CV4010, Ulys 6S19P-V
Gone: HD595, DV336i
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02-10-2008, 12:03 AM
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100+ Head-Fi'er
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Join Date: Oct 2007
Location: Deep South Texas
Posts: 139
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Quote:
Originally Posted by Penchum
The very bottom pic, the bottom chip, might be worth cleaning off to see if the surface of the chip shows signs of overheating (melting,smudging). It looks a little bumpy to me.?
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I thought the same thing about the chip in photo #2 as well.
__________________
Go ahead, follow that "Yellow Brick Road"... 'cause no matter where you go there you are.
Foobar2K (KS/FLAC)-> AV-710 (coax)-> COMPASS Dac/Amp (Earth HDAM in DAC)-> Gilmore Lite/DPS-> Senn HD650
Portable: Cowon D2 > CrossRoads MylarOne Ruby x3i
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02-10-2008, 12:03 AM
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100+ Head-Fi'er
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Join Date: Dec 2005
Location: Sweden
Posts: 209
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Quote:
Originally Posted by Penchum
The very bottom pic, the bottom chip, might be worth cleaning off to see if the surface of the chip shows signs of overheating (melting,smudging). It looks a little bumpy to me.?
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I have cleaned it, it seems okay.
__________________
Phones: HD650, HD485
Source: M-Audio 192, Zero Dac, Constantine+
Amp: DV332 (CV4010, Ulys 6S19P-V
Gone: HD595, DV336i
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02-10-2008, 12:25 AM
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Headphoneus Supremus
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Join Date: Oct 2006
Location: Arizona
Posts: 3,262
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Quote:
Originally Posted by davve
I have cleaned it, it seems okay.
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Good. I just wanted to make sure. The only other thing you could check is to look closely at every chip's top surface for a tell-tale sign of head damage, usually a circle spot that has turned to liquid and cooled. Then I guess look closely at the fuses, and connections. Let me know if you find anything suspicious.
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