I am having some sound quality issues with my new Oppo BDP-105D and was wondering if an impedance mismatch could be the culprit. What effect can an impedance mismatch between the preamp and amp have? The BDP-105D has an output impedance of 100 Ohms and Oppo recommends an your amp to have an input impedance of 47 Ohms. My amp is an Acurus A150 and has an input impedance of 21 Ohms. Could this mismatch lead to some SQ issues?
Regards,
James
Regards,
James
which would mean 21.000 ohmHi Tinitis,
Well that is a long story. So I left it out of the OP. While the sound stage opened up and there is more detail. There is a loss in what I would call weight to the individual instruments. They no longer have a holographic and real sound to them. There is also more bass. But almost an exaggerated and slightly distracting or annoying. That may be I just need getting used to it. That said there is less punch, slam and attack. In short the magic that I had is now gone. I am not saying that the sound is outright bad sound. It is just a step down rather than up from what I had already. With the exception of the wider sound stage and more detail.
This is going straight out of the Oppo player into the amp. Now if I go digital coax into my EAD Theatermaster Encore. Then the magic is back in spades with more detail. That is compared to my Adcom GCD 700 CDP as a transport into the Theatermaster.
So my conclusion is something is amiss. The Theatermaster was well regarded for its two channel performance. But that thing was built in 1998. The Oppo is being compared to $10,000 modern units. I either have a dud on my hands. Or it just does not like my amp for some reason. It even sounds better going analog out of the Oppo into the Theatermaster. So that made me think about the recommended input impedance.
Please keep in mind that I am not well versed in Audiophile speak. So if some of the terms I used above do not make sense....
Ps. My speakers are a pair of Paradigm Studio 100 V2
Regards,
James
Well that is a long story. So I left it out of the OP. While the sound stage opened up and there is more detail. There is a loss in what I would call weight to the individual instruments. They no longer have a holographic and real sound to them. There is also more bass. But almost an exaggerated and slightly distracting or annoying. That may be I just need getting used to it. That said there is less punch, slam and attack. In short the magic that I had is now gone. I am not saying that the sound is outright bad sound. It is just a step down rather than up from what I had already. With the exception of the wider sound stage and more detail.
This is going straight out of the Oppo player into the amp. Now if I go digital coax into my EAD Theatermaster Encore. Then the magic is back in spades with more detail. That is compared to my Adcom GCD 700 CDP as a transport into the Theatermaster.
So my conclusion is something is amiss. The Theatermaster was well regarded for its two channel performance. But that thing was built in 1998. The Oppo is being compared to $10,000 modern units. I either have a dud on my hands. Or it just does not like my amp for some reason. It even sounds better going analog out of the Oppo into the Theatermaster. So that made me think about the recommended input impedance.
Please keep in mind that I am not well versed in Audiophile speak. So if some of the terms I used above do not make sense....
Ps. My speakers are a pair of Paradigm Studio 100 V2
Regards,
James
Does anyone else care to comment regarding what may be the issue. Why would Oppo recommend a specific impedance.
Regards,
James
Regards,
James
is in original condition, or did someone poke around inside it ?
btw, you asked about impedances, and now you say it sounds better analoge ... I don't understand, is it about analoge or digital😕
The Oppo is new from the manufacturer no mods.
The problem is when using the analog outputs from the Oppo player direct to the amp. I only mentioned using the digital out as a comparison that sound good using the DAC in my Theatermaster pre/pro.
Regards,
James
Connecting OPPO BDP-105EU directly to a power amplifier or active speakers
BDP-105EU is well suited to being directly connected to a power amp or active speakers. The players level
(volume) control uses the dual Sabre32 DAC's which have patented 32 bit level control which is claimed to
perform as well as all but the most advanced analogue volume controls.
The Sabre32 DAC allows very fine level control. Quoted from the Sabre32 white paper:
The firmware presents a 0.5dB volume control register to the user allowing setting of volume to 0.5dB
accuracy. However, internally the volume control operates to less than 1/64 of a dB and smoothly moves
from one requested volume to the next. This results in a perfectly click-less volume step.
BDP-105EU also allows channel delay (speaker distance) to be adjusted in quarter millisecond (0.25' / 3”)
steps. Individual speaker levels can be adjusted in 0.5dB steps. Crossover points of 40Hz / 60Hz / 80Hz /
90Hz / 100Hz / 110Hz / 120Hz / 150Hz / 200Hz / 250Hz are available with 80Hz being the default setting.
Crossover is global, “per channel” crossover is not possible.
Important Note: After firmware update the player requires a factory reset to ensure correct operation. This
will reset volume level to “Fixed” and the actual volume to 100 (maximum). Please ensure you enter the setup
menu and set volume to “Variable”, then lower the volume control to an initial setting of 45-50 before
powering on your amplifier or active speakers after factory reset. Volume setting is retained in memory
when the player is put in standby. So volume at power on remains the same as volume at power off.
• Output impedance 7.1 board L/R front channels 100Ω
• Output impedance dedicated stereo board L/R channels 100Ω
• Output impedance 7.1 board all channels except L/R front 200Ω
• Recommended amplifier input impedance is 47KΩ (Industry standard)
• Peak output level: 2.1 Vrms (RCA / Phono)
• Signal-to-Noise Ratio: >130dB (A-weighted, auto-mute), >115dB (A-weighted, no auto-mute)
• Dynamic Range: >110dBV
• Channel Separation: >110dB
OPPO BD UK Ltd
42 Hellesdon Park Road, Norwich, NR6 5DR, United Kingdom
UK: 0845 060 9395 EU: +44 1603 402240 service@oppo-bluray.co.uk
OPPO BD UK | OPPO BD UK
BDP-105EU is well suited to being directly connected to a power amp or active speakers. The players level
(volume) control uses the dual Sabre32 DAC's which have patented 32 bit level control which is claimed to
perform as well as all but the most advanced analogue volume controls.
The Sabre32 DAC allows very fine level control. Quoted from the Sabre32 white paper:
The firmware presents a 0.5dB volume control register to the user allowing setting of volume to 0.5dB
accuracy. However, internally the volume control operates to less than 1/64 of a dB and smoothly moves
from one requested volume to the next. This results in a perfectly click-less volume step.
BDP-105EU also allows channel delay (speaker distance) to be adjusted in quarter millisecond (0.25' / 3”)
steps. Individual speaker levels can be adjusted in 0.5dB steps. Crossover points of 40Hz / 60Hz / 80Hz /
90Hz / 100Hz / 110Hz / 120Hz / 150Hz / 200Hz / 250Hz are available with 80Hz being the default setting.
Crossover is global, “per channel” crossover is not possible.
Important Note: After firmware update the player requires a factory reset to ensure correct operation. This
will reset volume level to “Fixed” and the actual volume to 100 (maximum). Please ensure you enter the setup
menu and set volume to “Variable”, then lower the volume control to an initial setting of 45-50 before
powering on your amplifier or active speakers after factory reset. Volume setting is retained in memory
when the player is put in standby. So volume at power on remains the same as volume at power off.
• Output impedance 7.1 board L/R front channels 100Ω
• Output impedance dedicated stereo board L/R channels 100Ω
• Output impedance 7.1 board all channels except L/R front 200Ω
• Recommended amplifier input impedance is 47KΩ (Industry standard)
• Peak output level: 2.1 Vrms (RCA / Phono)
• Signal-to-Noise Ratio: >130dB (A-weighted, auto-mute), >115dB (A-weighted, no auto-mute)
• Dynamic Range: >110dBV
• Channel Separation: >110dB
OPPO BD UK Ltd
42 Hellesdon Park Road, Norwich, NR6 5DR, United Kingdom
UK: 0845 060 9395 EU: +44 1603 402240 service@oppo-bluray.co.uk
OPPO BD UK | OPPO BD UK
BDP-105EU also allows channel delay (speaker distance) to be adjusted in quarter millisecond (0.25' / 3”)
steps. Individual speaker levels can be adjusted in 0.5dB steps. Crossover points of 40Hz / 60Hz / 80Hz /
90Hz / 100Hz / 110Hz / 120Hz / 150Hz / 200Hz / 250Hz are available with 80Hz being the default setting.
could that be your problem ? 😕
steps. Individual speaker levels can be adjusted in 0.5dB steps. Crossover points of 40Hz / 60Hz / 80Hz /
90Hz / 100Hz / 110Hz / 120Hz / 150Hz / 200Hz / 250Hz are available with 80Hz being the default setting.
could that be your problem ? 😕
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