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post #1 of 13 Old 06-11-2013, 12:08 AM - Thread Starter
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hi

Does anyone know if connecting the 5.1 input of the avr bypasses the internall processor of the avr?
In theory, it should but im just not sure if all avr are like that or not.
Thanks for any input.
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post #2 of 13 Old 06-11-2013, 01:33 AM
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Quote:
Originally Posted by RicardoJoa View Post

hi

Does anyone know if connecting the 5.1 input of the avr bypasses the internall processor of the avr?
In theory, it should but im just not sure if all avr are like that or not.
Thanks for any input.

I think it will depend on the processor. I have a 4311 and I've been using the Ext Input (7.1 analog input) to play stereo SACDs to avoid as much processing as possible. But I found that the channel levels on Ext Input can be adjusted using the 4311's CH Level button on the remote. So that leads me to indicate that the Ext Input of the 4311 isn't a true bypass. Now how much processing is actually taken place and how pure the signal is I'm not really sure.

Bill

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post #3 of 13 Old 06-11-2013, 01:59 AM
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http://www.avsforum.com/t/1475492/how-does-my-avr-process-an-analog-signal

Audiosceptics accept audio trials using 25 people. A recent Oxford study with over 353,000 patient records from 639 separate clinical trials shows for every 1,000 people taking diclofenac or ibuprofen there would be 3 additional heart attacks, 4 more cases of heart failure and 1 death every year.

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post #4 of 13 Old 06-11-2013, 05:54 AM
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With the vast majority of AVRs, it is not possible to apply digital processing to the multichannel analog inputs. The AVR can adjust channel levels, but nothing else. A few expensive processors can digitize the MCH analog inputs and then do all the usual digital processing.
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post #5 of 13 Old 06-11-2013, 07:17 AM - Thread Starter
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Quote:
Originally Posted by Bill Mac View Post

I think it will depend on the processor. I have a 4311 and I've been using the Ext Input (7.1 analog input) to play stereo SACDs to avoid as much processing as possible. But I found that the channel levels on Ext Input can be adjusted using the 4311's CH Level button on the remote. So that leads me to indicate that the Ext Input of the 4311 isn't a true bypass. Now how much processing is actually taken place and how pure the signal is I'm not really sure.

Bill

Mine does that too.
I think it is just going trough the analogue section for gain. Not sure. I try adusting bass and treble and could not. Basically is pretty limited on what it can do. But in theory, it should not get converted to digital, because it is supoose to get what the SACD player put out, other wise it would be contradicting.

Thanks
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post #6 of 13 Old 06-11-2013, 07:21 AM
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Your AVR manual will explain what the processor does and does not do with the MCH analog inputs.
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post #7 of 13 Old 06-11-2013, 07:43 AM
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Typically...
The 5.1/7.1 inputs bypass the DSP processor so one has no Room EQ or Bass Management....

Just my $0.02.. 👍😉
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post #8 of 13 Old 06-11-2013, 12:00 PM - Thread Starter
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Originally Posted by BIslander View Post

Your AVR manual will explain what the processor does and does not do with the MCH analog inputs.

Sure the manual explain what the avr does. Not much on what it cant do and nothing spcifically with regards on how the signal is beeing treated.
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post #9 of 13 Old 06-11-2013, 12:26 PM
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Manuals can be fairly obtuse. What receiver are you using?
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post #10 of 13 Old 06-11-2013, 06:18 PM
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The user manual would never disclose such details. It's already been said by myself and others (in the link above if you care to read) that unless you read the schematics you just can't be sure whether analogue stays analogue throughout.

Audiosceptics accept audio trials using 25 people. A recent Oxford study with over 353,000 patient records from 639 separate clinical trials shows for every 1,000 people taking diclofenac or ibuprofen there would be 3 additional heart attacks, 4 more cases of heart failure and 1 death every year.

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post #11 of 13 Old 06-11-2013, 08:26 PM
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^^ That's quite a position to take - that manuals don't answer the OP's question about whether a receiver processes the MCH analog inputs. My Denon manual explains that no processing is applied to the external inputs. (That was the question, btw, not whether there's a conversion to digital along the way.) As to whether there's a digitizing step, are you suggesting that a manufacturer would go to the expense of doing ADCs for up to eight channels, but not apply bass management, distance adjustments, tone controls, or any other digital processing to the resulting PCM? Why would they do that?

The posts in your link are almost all about the analog stereo and phono inputs, not multichannel analog - the subject of this thread. The limited discussions of MCH in those posts come the same conclusions that have been posted here - that there's no digital processing except for a few processors that actually do an ADC. I've read manuals for HK and Denon receivers that digitize the external inputs and they explain at some length how to take advantage of the ADC. Manuals for many other receivers explain that no such processing is done with the MCH inputs, although the meaning of those explanations is sometimes not very clear.

At any rate, I think it's likely the manual for the OP's receiver will provide the answer to his question.
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post #12 of 13 Old 06-11-2013, 11:33 PM - Thread Starter
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Quote:
Originally Posted by BIslander View Post

^^ That's quite a position to take - that manuals don't answer the OP's question about whether a receiver processes the MCH analog inputs. My Denon manual explains that no processing is applied to the external inputs. (That was the question, btw, not whether there's a conversion to digital along the way.) As to whether there's a digitizing step, are you suggesting that a manufacturer would go to the expense of doing ADCs for up to eight channels, but not apply bass management, distance adjustments, tone controls, or any other digital processing to the resulting PCM? Why would they do that?

The posts in your link are almost all about the analog stereo and phono inputs, not multichannel analog - the subject of this thread. The limited discussions of MCH in those posts come the same conclusions that have been posted here - that there's no digital processing except for a few processors that actually do an ADC. I've read manuals for HK and Denon receivers that digitize the external inputs and they explain at some length how to take advantage of the ADC. Manuals for many other receivers explain that no such processing is done with the MCH inputs, although the meaning of those explanations is sometimes not very clear.

At any rate, I think it's likely the manual for the OP's receiver will provide the answer to his question.

Yes, it doesnt make much sense going trough ADC and processing in MCH input, as that will mess with the decoding from the player.
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post #13 of 13 Old 06-12-2013, 06:49 AM
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Are you going to provide the name and model of your receiver?
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