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REVIEW: Keces DA-151 DAC 800+ hours burn-in - Page 10

post #136 of 305
6/11/08 at 7:05am
Thread Starter 
Quote:
Originally Posted by anadin View Post
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.
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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post #137 of 305
6/11/08 at 5:58pm
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.
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post #138 of 305
6/11/08 at 7:50pm
Man, I can't wait to get my hands either the 151 or the 131
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post #139 of 305
6/12/08 at 5:56pm
Nice pics Dual, and thanks for the info.
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post #140 of 305
6/16/08 at 6:38am
Quote:
Originally Posted by anadin View Post
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.
Can you describe your setup in more details? and was LD MKV tested with other sources before?
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post #141 of 305
6/16/08 at 6:17pm
Quote:
Originally Posted by anadin View Post
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.
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
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post #142 of 305
6/18/08 at 1:31am
Can the Keces take bipolar input op-amps?
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post #143 of 305
6/18/08 at 1:39am
Quote:
Originally Posted by GuyMe View Post
Can the Keces take bipolar input op-amps?
It is not recommended, we recommend FET input unity gain stable op amps.


Thanks
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post #144 of 305
6/18/08 at 1:41am
Why is it not recommended?

Thanks for the prompt response.
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post #145 of 305
6/18/08 at 7:26am
Quote:
Originally Posted by GuyMe View Post
Why is it not recommended?

Thanks for the prompt response.
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
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post #146 of 305
6/18/08 at 4:06pm
So they won't work at all? Is it dangerous to the circuit?
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post #147 of 305
6/18/08 at 5:33pm
Quote:
Originally Posted by GuyMe View Post
So they won't work at all? Is it dangerous to the circuit?
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?
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post #148 of 305
6/18/08 at 5:45pm
I'm considering AD797, LT1028, and AD843.

I suppose I could put heatsinks on them, but oscillation sounds nasty.
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post #149 of 305
6/18/08 at 5:52pm
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.
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post #150 of 305
6/18/08 at 5:56pm
Excellent, thank you!
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