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Old 2nd January 2013, 03:00 AM   #1
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Default Full digital stereo amplifier QLS QA100, any comments?

A very interesting full digital stereo amplifier QA100 , this amplifier does not have any analog input, and is able to support I2S, Coaxial and Optical in 16-24bit, 32K-192KHz format with ASRC. Amplifying digital signal and outputting by a LPF circuit at the final stage.

Very interesting idea however a question for the LPF circuit HiFi enough or not.

Anybody here has the experiences with LPF circuit?

Last edited by lxiaob; 2nd January 2013 at 03:18 AM.
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Old 2nd January 2013, 05:38 AM   #2
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The other designs that I've seen for switching amps use toroidal cores for the LPF, I'm curious to know more about their output inductors here.
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Old 15th March 2013, 04:58 AM   #3
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Got this amp last week, and have tried different equipment combination with this little baby. Generally speaking, this is a very good amp with great price. I will post my test latter.

Tried together with the equipment listed as below:

- Stahl tek A.B.C USB/SPDIF convertor
- Yulong D100 MKii
- MG-Si15 DT tube amp
- Open source USB DAC http://www.qnktc.com/ab_12.php
- Thinkpad X40 with Lubuntu latency kernel

Last edited by lxiaob; 15th March 2013 at 05:01 AM.
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Old 16th March 2013, 02:43 AM   #4
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The best set is "X40+Stahl tek A.B.C+QA100", the sound from this set was sweat, full of details, and smooth like silk that should be something from a tube amp. if you like female vocal, this is the one you may consider. Some USB DACs have great performance, no doubt Stahl tek A.B.C is one of them. However this Stahl tek A.B.C was paid $2000 from ebay, the money tells something. QA100 gave me a lot of surprises from different combinations, every time changing partner, every time it showed the endless potential to me. Sometimes money tells, sometimes not, only sound can tell. QA100 is only $300 some dollars, but the performance was better than my $1200 MG-Si15 DT.

The QA660+QA100 combination is very good for jazz and rock as the bass was better than X40+Stahl tek A.B.C+QA100, the bass performed by this combination is full of energy like all the bass instrumentation just surrounded me.

Last edited by lxiaob; 16th March 2013 at 03:09 AM.
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Old 18th March 2013, 03:00 AM   #5
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I have to say Yulong D100 MKii disappointed me at any kind, this DAC was even worst than the open source usb DAC that I just one third of the money.
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Old 4th June 2013, 02:26 AM   #6
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d100 from mcintosh
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Old 4th June 2013, 02:27 AM   #7
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2500 us dollor
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