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FREO-1, I have been considering the Yamaha AS-2000 for some time. I planned to hook my OPPO-95 directly to it via XLR but hesitated because of possible amperage imbalance. OPPO has a 4V output and the Yamaha has a 2.8V input. An OPPO tech told me an annoying way to handle it, which I am posting below."You will need to reduce the volume of the player by at least half to not exceed the input impedance of your amplifier. You will want to set the player's output volume to 0 then play a CD. Increase the volume to 1. If you find that a comfortable listening volume is received between 1-20, then try a 24dB attenuator. 21-50, a 12dB attenuator, and anything else a 6dB attenuator would be recommended to allow you enough headroom to control the volume on the player for when the volume of the source is too soft (need more volume) or too loud (need less volume)."Did you have success connecting your OPPO directly to the Yamaha without making any complex adjustments?
I would like to try one of these out if I run across a used one for a good price. The rated power is a little lower than I prefer but if the SQ is that good then maybe I wouldn't mind. It'll be interesting to see what the 3000 series manages... Whenever it shows up
I know you have been a big Pass Class A amp fan. Can you let us know how this amp compares to some of the Pass designs?
..... It's amazing someone else hasn't come up with this sooner.
Yamaha A-S2000, Kef LS50s, & Daedalus 'subs'. A+B=Wow!
Here is an update from additional listening: It seems as if some of the detail was missing when listening to SACD/DVD-A from the Oppo BDP-105 via XLR. I compared various SACD's to the Yamaha CD-S2000, and in every case, the CD-S2000 HAD the low level detail and presence missing from the Oppo. Earlier, had worked out with Yamaha the XLR input was limited to 2.8 V RMS. So, the volume out from the Oppo was set to 67 to "work around" this limitation. At this point, rang Oppo to get a readout on the digital volume out. I remember Dan Wright from Modwright posting on more than one occasion that the digital volume on the Oppo reduces the bits as the volume was lowered. When I ran Oppo before, the tech had said there was no loss of fidelity by lowering the volume. Yet, the listening sessions were painting a different story. Well, as it turns out, Dan was (of course) correct. The tech at Oppo looked it up, and sure enough, that is how it works. Turning down the volume on the Oppo does indeed reduce the fidelity (bits) used. It is for this reason that using the Oppo as a preamp is sub-optimum, and thus should be avoided. The real "work around" to this is to not use the XLR from the Oppo, but instead to use the excellent two channel RCA out from the Oppo. Resolved. The low level detail missing from the Oppo is back, and no overload to worry about.
Try the Oppo 105 again using the balanced outputs and set the variable volume to "88" instead of "67". Each step in the volume on the Oppo 105 is .5dB. Setting the volume at "88" (-6dB) is approximately 2.1v on the balanced outputs, same as the RCA output at full volume. Reducing the volume by 6dB cuts the output voltage in half. http://www.oppo-bluray.co.uk/UserFiles/Docs/PDF/BDP-105EU%20Direct%20Power%20Amplifier%20Connection%20V2.pdfA 6dB reduction with a 32 bit digital volume control is minor and any loss of bits is not audible, IMHO.
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