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| Computer Audio Discussion of computers as source components, sound cards, USB DACs, media servers, etc. |
06-11-2008, 11:05 AM
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Headphoneus Supremus
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Join Date: Aug 2006
Location: In Sunny NE Florida
Posts: 3,347
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Quote:
Originally Posted by anadin
I have had the KECES DA-151 USB DAC for about 3 days now.
I have it connected up to a Little Dot Mk V, headphones are a pair of Senn Hd650's.
Unless there is a dramatic change in the bass area then I am going to have to let the KECES DA-151 go and get myself a CD player.
The bass is all over the place, really boomy not my thing at all.
It could also be that the Little Dot Mk V doesn't quite have enough power to push the Hd650's to where I want them to go, anyone else found this to be the case.
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I would have to blame that on the LDV. ESPECIALLY if you're concerned about them being able to properly drive the HD650's to where to want them to be.
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06-11-2008, 09:58 PM
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100+ Head-Fi'er
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Join Date: Sep 2007
Location: Austin, Texas
Posts: 310
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That doesn't sound right. The Little Dot MK V should have plenty of power for HD650s. You might want to talk to Maniac about it. It may be a setup problem with your PC. It shouldn't be anything else.
__________________
ANALOG - Technics SL-1200MKII (Denon DL-160) -> Marantz 2226b -> PS Audio GCHA -> Sennheiser HD580
DIGITAL - Marantz DV4500 -> PS Audio GCHA -> Sennheiser HD580
Central Texas Meet Interest Check
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06-11-2008, 11:50 PM
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100+ Head-Fi'er
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Join Date: May 2008
Posts: 105
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Man, I can't wait to get my hands either the 151 or the 131 
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06-12-2008, 09:56 PM
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Head-Fi'er
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Join Date: May 2008
Location: Buffalo, NY
Posts: 58
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Nice pics Dual, and thanks for the info.
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06-16-2008, 10:38 AM
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500+ Head-Fi'er
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Join Date: Sep 2003
Location: Taipei, Taiwan
Posts: 584
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Quote:
Originally Posted by anadin
I have had the KECES DA-151 USB DAC for about 3 days now.
I have it connected up to a Little Dot Mk V, headphones are a pair of Senn Hd650's.
Unless there is a dramatic change in the bass area then I am going to have to let the KECES DA-151 go and get myself a CD player.
The bass is all over the place, really boomy not my thing at all.
It could also be that the Little Dot Mk V doesn't quite have enough power to push the Hd650's to where I want them to go, anyone else found this to be the case.
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Can you describe your setup in more details? and was LD MKV tested with other sources before?
__________________
Currently applying for Member of Trade status...
Feedback Thread: http://www.head-fi.org/forums/f12/maniac-329127
The creator of UberShipSpeed, ExtremeNeutralToneExpansionResonancePerformanceRev ealIsolationSystemEnhancement. (USS-ENTERPRISE)
(love that string of meaningless acronyms...)
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06-16-2008, 10:17 PM
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100+ Head-Fi'er
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Join Date: Mar 2008
Location: Pasadena, California
Posts: 355
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Quote:
Originally Posted by anadin
I have had the KECES DA-151 USB DAC for about 3 days now.
I have it connected up to a Little Dot Mk V, headphones are a pair of Senn Hd650's.
Unless there is a dramatic change in the bass area then I am going to have to let the KECES DA-151 go and get myself a CD player.
The bass is all over the place, really boomy not my thing at all.
It could also be that the Little Dot Mk V doesn't quite have enough power to push the Hd650's to where I want them to go, anyone else found this to be the case.
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This is not at all reflective of my experience with my Keces.
My 131 was very pleasing right out of the box, fast and musical, with good separation and nice tight, controlled bass.
If I had to pick a weakness, I would say that the trebles were a bit muted prior to burn in - however, this is relative to the X-fi dac, which is known for harsh and somewhat fatiguing highs. The more I listen to and burn-in the Keces, the more I like what I hear.
I'm probably nearing 100 hours now, and the trebles have really blossomed, the sound stage has improved, and the bass remains solid and controlled. This DAC gives a hi-fi presentation while preserving the musicality of the source material. I'm really enjoying it
__________________
Home: Arcam DV78 or (X-fi ASIO bit-perfect -> KECES 131 DAC) -> WooAudio 3 OTL Tube Amp (2x Amperex 7308PQ's & Tung-Sol 5998) -> Sennheiser HD650 / Beyerdynamic DT880 (250Ω)
Mobile: iPhone 3g -> IE8 (w/ sony tips) / NuForce Ne-7m (w/ sony tips) / ER-6i
Feedback: http://www.head-fi.org/forums/f12/skeptic-317533/
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06-18-2008, 05:31 AM
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500+ Head-Fi'er
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Join Date: Aug 2004
Location: MA, USA
Posts: 647
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Can the Keces take bipolar input op-amps?
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06-18-2008, 05:39 AM
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500+ Head-Fi'er
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Join Date: Sep 2003
Location: Taipei, Taiwan
Posts: 584
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Quote:
Originally Posted by GuyMe
Can the Keces take bipolar input op-amps?
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It is not recommended, we recommend FET input unity gain stable op amps.
Thanks
__________________
Currently applying for Member of Trade status...
Feedback Thread: http://www.head-fi.org/forums/f12/maniac-329127
The creator of UberShipSpeed, ExtremeNeutralToneExpansionResonancePerformanceRev ealIsolationSystemEnhancement. (USS-ENTERPRISE)
(love that string of meaningless acronyms...)
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06-18-2008, 05:41 AM
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500+ Head-Fi'er
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Join Date: Aug 2004
Location: MA, USA
Posts: 647
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Why is it not recommended?
Thanks for the prompt response.
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06-18-2008, 11:26 AM
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500+ Head-Fi'er
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Join Date: Sep 2003
Location: Taipei, Taiwan
Posts: 584
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Quote:
Originally Posted by GuyMe
Why is it not recommended?
Thanks for the prompt response.
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Most bipolar input op amp will need a bit of change to the circuit when it is used in circuit designed for FET input op amps. Thus we don't recommend using bipolar op amps.
Thanks
__________________
Currently applying for Member of Trade status...
Feedback Thread: http://www.head-fi.org/forums/f12/maniac-329127
The creator of UberShipSpeed, ExtremeNeutralToneExpansionResonancePerformanceRev ealIsolationSystemEnhancement. (USS-ENTERPRISE)
(love that string of meaningless acronyms...)
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06-18-2008, 08:06 PM
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500+ Head-Fi'er
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Join Date: Aug 2004
Location: MA, USA
Posts: 647
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So they won't work at all? Is it dangerous to the circuit?
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06-18-2008, 09:33 PM
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500+ Head-Fi'er
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Join Date: Sep 2003
Location: Taipei, Taiwan
Posts: 584
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Quote:
Originally Posted by GuyMe
So they won't work at all? Is it dangerous to the circuit?
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Most of the time, it won't be dangerous or anything, but the op amp may heat up abnormally, or the output may oscillate or a bit unstable.
Which op amp do you have in mind?
__________________
Currently applying for Member of Trade status...
Feedback Thread: http://www.head-fi.org/forums/f12/maniac-329127
The creator of UberShipSpeed, ExtremeNeutralToneExpansionResonancePerformanceRev ealIsolationSystemEnhancement. (USS-ENTERPRISE)
(love that string of meaningless acronyms...)
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06-18-2008, 09:45 PM
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500+ Head-Fi'er
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Join Date: Aug 2004
Location: MA, USA
Posts: 647
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I'm considering AD797, LT1028, and AD843.
I suppose I could put heatsinks on them, but oscillation sounds nasty.
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06-18-2008, 09:52 PM
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500+ Head-Fi'er
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Join Date: Sep 2003
Location: Taipei, Taiwan
Posts: 584
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I have personally tried 797 and it appears to be working, but at the time I have not tried to measure it with a scope or other equipments that can detect oscillation.
I'll inquire this part with the designer of this DAC and see what's his take on this. 
__________________
Currently applying for Member of Trade status...
Feedback Thread: http://www.head-fi.org/forums/f12/maniac-329127
The creator of UberShipSpeed, ExtremeNeutralToneExpansionResonancePerformanceRev ealIsolationSystemEnhancement. (USS-ENTERPRISE)
(love that string of meaningless acronyms...)
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06-18-2008, 09:56 PM
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500+ Head-Fi'er
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Join Date: Aug 2004
Location: MA, USA
Posts: 647
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Excellent, thank you!
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