Originally Posted by 808///M3
Which electrical parameters - of power amps - would one have to consider when connecting a 105 directly to them?
- Input impedance; is there a minimum? Is higher always better? I understand the 105's output impedance is 100 Ohms.
- dB gain?
- Input sensitivity?
- How much different are the above between the XLR and RCA outputs?
The reason I ask is:
- I want to know what electrical parameters will give the best range of levels (from barely audible, to louder-than-needed), without sacrificing dynamics or an inaudible noise floor.
- I've read that even when the 105 is at volume level "1," some say their system plays too loud.
- I want to know, will you lose dynamic range when reducing levels digitally? For example, will there still be 24 bits of dynamic range at volume level 1-10?
- It seems gain controls on each channel could be mandatory for some power amps - mainly to reduce
the gain. How much adjustability is needed?
Sorry for cross-posting, but there are at least 2 threads on this specific subject.
Great questions. I'd like to learn more about it as well.
I am brand new to the 105 and have it connected directly to my Pass Labs X250. My amp has 30db of gain and 22 Ohms input impedance. My speakers have a stingy sensitivity at ~85db.
In my system (2.1), the volume gets only a little louder than loud enough (for most of the movies I've tried). For Kung Fu Panda, though, 100 on the volume is NOT quite loud enough. With my Integra DTR7.8 in the mix, a volume of -7db was freaking LOUD. Or... it sounded
loud. Interestingly, the Oppo's stereo mixdown and analog outs present a much more textured and nuanced sound on Bluray. It's very different from the Integra and other surround receivers I've heard which seem to present audio as soft, medium, or loud - and nothing in between.
So... I am really encouraged with the analog outs of the Oppo but disappointed with the volume control / gain. I guess I need to think about putting a pre/pro back in. or a 2 channel preamp AND a processor. or ... I dunno. I'll stick with this for a while.
Also, volume setting 1 is way too loud (for me). It's about as loud as someone talking from across a table.