#21
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I considered purchasing another accuphase cd transport to connect with my DC-37. I am coming to the conclusion it would not be cost affective. I visited Accuphase yesterday and spoke with Mr. Tozuka, international rep. I asked him if I could purchase a old cd transport like the dp-77 and connect to the DC-37. He advised against it because the newer components don't match well with the older components. In other words it would degrade the potential of the system. After reading the tests between the ultra expensive components and the modest expensive components, I am thinking a cost-effective oppo will be the best match for the DC-37.
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#22
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OK, I have found an explanation! I have found online a service manual for the A-65 amp and therein it was mentioned that the uncertainty of the meters when indicating values of 0.020W is +/-50%.
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#23
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Quote:
in my humble opinion you are relying to much on the power meters from the Accuphase A65. I own A60 and A 70 and I know that these power meters reading are the best in the whole hifi industriy but I am not sure if these power meters show the exact amount for low power. My suggestion, do it the way, I explained in one of my quotes. You have two choices: 1. You measure the output voltage, but you have to take care with your extrem sensetive speakers, that you have the exact amount of voltage from both equipments. 2. Take a 1khz test tone, measure the SPL from both equipments and equal the SPL (Maximum difference 0,1 dB). Of course you need an exellent microphone and good software to do this. In my humble opinion and please don´t be upset, something went wrong so far in your experiment, because it is absolut impossible that one equipment sounds 10dB louder than the other as you explained when you leveled them on the same SPL before. I asked also a good friend of mine, who gave me years ago the idea and the right procedure for the blind test (He worked in the past for the Frauenhofer Institut and was part of the MP3 blind test. But better I don´t tell you, which results they achieved...). He told me again that in a "correct" blind test it is absolut impossible the results and differences in SPL which you achieved. Good luck and best regards Martin Last edited by Barsur; 11-21-2015 at 02:11 AM. |
#24
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Quote:
Best regards Martin |
#25
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Every engineer knows:
"Who measures a lot, measuers a lot of sh..." It means; The individual setup of a measurement/test environment will influence the results. (Similar to: I only believe into statistics I have falsified myself). This is why a large number of measurement procedures are fixed in international, national or industry standards (i.e. IEC, IEEE, EIA, DIN, IHF, AES/EBU and more). A plausibility check is necessary to help to determine, whether the measurement results are relyable or whether you need to apply changes to your measurement/test setup. In addition, all measuring equipment has tolerances. The measured value has therefore to be understood as value +/- tolerance. These are essential basics for everyone who measures/tests. Martin |
#26
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I like this quote very much and I often mention it to my students. Most often they understand its meaning only after a whole year of hard work.
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#27
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I like this quote very much. It's funny and true. I often tell it to my students, and usually they need to work on real world research projects for more than a year to appreciate it.
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#28
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I reopen this topic because I'm waiting for a DC-300 to arrive so I can finally try it out by myself and compare it to the C-2420. If for me there are no perceivable differences in noise and general audio quality, I'll have the added benefit to be able to use the DG-58 in a digital loop, and to connect many more digital sources to the DC-300, all equalised, compared to go digital to the DG-58 (with fewer inputs) and then use the C-2420 preamp basically just as an expensive volume control (since I only use 1 source).
I've chosen the 300 and not the newer 330 because I ideally like the multibit approach (16x PCM 1702 as the DP-75), I think it has a better, no compromise, construction regarding PSU (digital+ analogue-R + analogue-L separated PSU) and beefier filter section, it has more inputs without having to acquire extra option boards and I like the simpler style. It is overall simply more interesting to me. What is also interesting, is that on the used market a DC-300 is valued 1/3 or max 1/2 the price of a C-290V, even if his price in Japan, at the time, was exactly the same (980'000¥). This fact alone maybe can partially answer my original question on the first post: the "DC-3xx" line of preamplifiers was probably never updated (also) for lack of clients interest and then sales. The subsequent 2xxx line, with AAVA, seems in fact to try very hard to push the fact that the AAVA is analogue. It is repeated a thousand times everywhere in the promotional material. Evidently, many Accuphase customers perceived the digital volume of the DC-3xx as something obviously and surely inferior to Good Old Analogue (maybe, as often is sadly the case, without having the possibility to properly test out and compare). Last edited by Mattia; 01-22-2016 at 11:51 AM. |
#29
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Barsur,
just a quick question. In the light blind test you performed and mentioned before, how was the DP-510 connected to the DC-300? It was connected to the analogue inputs or digital? Because if connected in analogue (so with another AD/DA passage in the signal path) the DC-300 was as transparent as the others, that would I think be an ulterior testament of his quality. And to further abuse of your patience: do you find any difference (regarding CD material obviously) in going digitally from the DP-510 to the DC-300 versus going analog? |
#30
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Quote:
For the light blind test, I had following configuration: Accuphase DP 510 analog in DC 300 in Accuphase A 70 and than to Magico S1. I used the analog input for comparison reason, because C290 and C2420 doesn´t have digital inputs. I compared (no blind test) the digital input against the analog input of the D-300 and the digital input seemed a little bit more transparent. But ofcourse without blind test this statement has no value at all. If you know what is playing than comes normally a psychologic effect. Typically for example, if people know that they are listening to tubes. In one of our last blind test, I compared a Mcintosh tube amplifer against a solid state Mcintosh amp. People thougt they would here to the Mcintosh MC 275 because I told them so, but instead they were listing again to MC 452. But everybody told me how much "warmer" the music is now with the tube amp. But I didn´t switch the amps, they were listing in reality again to the solid state amp. They were shocked how big the psychologic effect is in audio. Best regards Martin Last edited by Barsur; 01-23-2016 at 01:43 PM. |
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