Just a follow-up on my attenuator project for those with too much gain in your system. Especially as in my case Audyssey was out of spec showing -12 dB for one of my front speakers.
Here are my results. After a bit or trial and error i used the following scheme. I designed the circuit as having equal input and output impedance based on the input impedance of my Emotiva XPA-2 (33000 Ohm). I used 8dB as my desired level of attenuation. The exact numbers by the formula (http://radiomagonline.com/tutorials_...e_attenuators/
) worked out to:
Using the nearest resistor values available to buy I went with:
I used all 0.5 watt resistors.
I bought a female to male XLR adapter from a local electronics shop. The barrel for the adapter is pretty short so you've got to get a little creative fitting everything in there, but I made it work. The result works perfectly and seem to have no negative impact on sound quality. I have about -4dB trim now from Audyssey for my two front speakers versus around -12 dB before. I chose 8 dB as the attenuation as it basically makes the Emotiva represent 24 dB gain.
I agreed with the speculation that the output impedance of the Marantz is not 50000 Ohm and quite honestly the D&M Rep admitted he did not have the exact spec from the engineer, but took it from the Outlaw audio guide. Regardless the circuit works fine without that information.
Additionally, while the transformer battle is on, I took the time to ask the rep what type of transformer actually is in the AV7005. He said the question had come through to them through other channels just a few days earlier and they had confirmed that it is an EI Transformer with a round cover. I believe this to be true but then again I think we all agree it doesn't make a real difference.
I also saw a post about changing the HDMI bypass output while on standby. I'm pretty sure you can change the bypass output from within the web interface. While the unit is off and on standby, the web interface is still accessible and functional. This allows you to change the video source within the unit. I have not tested this to confirm as I'm not at home now, but I believe it does work correctly.
Hope that info is of assistance.