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Old 12th November 2011, 04:04 PM   #21
kawo is offline kawo  China
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Thankyou C Hing
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Old 16th November 2011, 01:49 PM   #22
kawo is offline kawo  China
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HPA-2 functions is to be replaced OP, to arrive at their favorite sound in the original design using OP27, because it is relatively average in every respect. Contrast this to the OP to do it as an intermediate, the first two HPA-2, the signal from the same CD player with a headphone listening.
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Old 16th November 2011, 01:55 PM   #23
kawo is offline kawo  China
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For comparison, first we have to determine the replacement of OP after the DC, because DC is easy to burn a lot of headphone's, HPA-2 after unplugging about 100mV below the OP, and OP will be in the installation within 1mV, usually only 0.1mV, can be said that good in my hands the factory machines, some of them up 9mV, if you have an interest in measuring the headphone amp.
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Old 17th November 2011, 04:31 PM   #24
kawo is offline kawo  China
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First up of course, is the most widely used 5534, I specifically chose the products long before, 83 years new, early products often discussed on the network is better, I would like to try.
Summary ------ 5534 either high or low frequency OP27 are no obvious, clear 5534 is relatively soft, very comfortable, feel good to listen to folk songs, there is less fog, but it should be 5534's charm, but with my current 5534 Well there were heard out of it!
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Old 17th November 2011, 05:09 PM   #25
nattawa is offline nattawa  Canada
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I suppose you were writing in English, but I found my Canadian language skills stop helping me making sense out of your last few posts. I didn't realize English language they teach in China has departed so much from what they teach here. It seems either I should go to China and learn something new, or you could switch back to some less advanced English language and help people like me who have got stuck in the old time to better understand what you are writing. Thanks.

The metal work in your project looks very nice, would you consider organizing a group buy for only the mechanical items including the casing, the connectors, the power switch, and the volume knob?
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Old 18th November 2011, 02:32 AM   #26
kawo is offline kawo  China
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Sorry! My poor English, I was the first to write Chinese using Google translate switch to English.


Group buy is OK, but I do not know how diyaudio processing, finished goods are sold on the ebay.com, USD $ 149 + USD $ 25 shipping
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Old 18th November 2011, 03:41 PM   #27
kawo is offline kawo  China
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Stronger than the OP27 bass, but treble is not good, however, I feel slow a little, others are similar to the OP27.
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Old 21st November 2011, 03:15 PM   #28
kawo is offline kawo  China
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OP37 OP27 sound performance with the same.
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Old 23rd November 2011, 01:45 PM   #29
kawo is offline kawo  China
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A customer in Hong Kong feel after use----Many thanks to kawoaudio building the excellent HPA-2 at very reasonable cost, this $5,000 HPA-2 + Sony MDR-SA5000 combo has quickly become one of my reference systems for personal music enjoyment when I do not have to disturb others. The transparency and instantaneous transient response are not challenged by any of my other can/amp combinations and yet musicality has never been compromised, despite the Sony would sound too analytical and sometimes dull with other headphone amps.

Amongst all these, the better combinations are T1 + Cyber 20, HD600 + XP-7, K702 + X-Can V8 and the SA5000 + HPA-2. All have their different sound signatures with T1/Cyber 20 and SA5000/HPA-2 belonging to a group with cleaner, neutral and more accurate sound while the K702/MF and HD600/XP-7 belonging to a much richer and thicker sound. It is surprising that the more expensive Beyerdynamic T1/A1 combo doesn't even sound up to par with the T1/Cyber 20 combo and the greatest pleasant surprise is the Sony/HPA combo which gives taut and deep bass, clean and sustaining highs from the piano and violin and even mid range of vocal is sweet and soothing, though not as rich as the Sennheiser.
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Old 28th November 2011, 03:58 PM   #30
kawo is offline kawo  China
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PM1008 sound a like 5534, but even more than the 5534 sound like a tube amp.
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