Oppo BDP-105 "Sound Quality" Check Thread for Audiophiles - Page 58 - AVS Forum
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post #1711 of 1717 Old 09-28-2014, 09:41 AM
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Jadis:
Eingangsempfindlichkeit 200 mV, Eingangsimpedanz >100 kOhm.

Rotel:
Eingangsimpedanz/-empfindlichkeit 22 kOhm/1,5 V
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post #1712 of 1717 Old 09-28-2014, 11:51 PM
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In regards to input impedance, I read that the XPA-1 has 33 kohms balanced as opposed to 23.5 kohms unbalanced, so I brought some cheap rca to xlr adaptors for the Cambridge, and to my surprise it sounds better through the balanced inputs using the adaptors, fidelity hasn't changed, but dynamics have improved across the board.

I thought this must have been due to the greater input impedance of the xlr inputs, until I realized that those specs were for the gen-2 XPA-1, I have the gen-1, and the input impedance of the balanced input is actually less, 18 kohms balanced, as opposed to 20 kohms unbalanced.
So that's got me confused, but either way I'm definitely going to stay with the xlr connection, so I've brought some Cardas clear rca to xlr adaptors to see if they're an improvement over the cheap hosa adaptors.

Anyone got any idea why dynamics would improve on the balanced inputs when it's not even receiving a balanced signal on those inputs?

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post #1713 of 1717 Old 10-15-2014, 01:02 PM
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hi y'all, I'm ready to buy this oppo 105. though I just read one guy was playing an external hard drive through the USB port and some noise came through and fried his tweeters. he then thought he could trace the problem to ripping the files with EAC. but then, a different guy said he heard some nasty noise coming through his speakers while playing a blu ray and he quickly shut off his system and it was ok. I know these posts were from a year or so ago, but was just wondering, have these issues been resolved and are they very common? has anyone ever experienced this problem while playing just a regular CD or DVD-audio? thanks, john (I want to buy this player but I have expensive speakers and I can't risk any funny business going on)
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post #1714 of 1717 Old 10-15-2014, 02:50 PM
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^ If this were a common problem you'd be seeing way more howls posted here and in the 105 Owner's Thread. There are lots of folks using these players in setups with spendy speakers.

Given the complexity of content authoring and of the gear that gets hooked together to make a system, it's never possible to say with absolute surety that there can never be an audio glitch. But it's not something that seems to be a constant worry for anybody.

If you depend upon a low Volume setting for normal listing, do be sure to check your Volume before playing content after a firmware install or Reset of the player, lest you get startled by an unexpected Volume 100.
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post #1715 of 1717 Old 10-15-2014, 05:39 PM
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I would be playing through a pre-amp, so would the volume control come in to play for me? isn't it just set at a line level?
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post #1716 of 1717 Old 10-15-2014, 05:59 PM
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Volume 100 (or "FIXED") is full output -- line level. That's typically what you would use feeding the inputs of a pre-amp. Do volume control in the pre-amp.

However, if you find you are hearing clipping in loud passages, your pre-amp may not have a normal amount of headroom. So lower Volume in the OPPO a few dB to prevent that. Each volume step is -0.5dB attenuation.

The Volume adjustment only affects the Analog audio outputs (except for Volume 0, which is implemented as Mute and also shuts down the Digital audio outputs.)
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post #1717 of 1717 Old 10-16-2014, 06:18 AM
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well, my pre-amp is the emo XSP-1 gen 2 so I think I'd probably be safe in the headroom department, and be able to play the OPPO with the volume on 100.
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