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Optimal Analog Out Options
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Mac Elite
Join Date: Oct 1999
Location: Carmel, IN, USA
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Offline
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I noticed that on my Mac Pro I have a few choices for the analog output (using Audio MIDI Setup). CD audio is 16 bit 44.1KHz, but there are of course other sources as well. I can choose for the line out to be a 16 bit, 20 bit or 24 bit depth and 44.1KHz, 48KHz and 96KHz. Of course the analog line output will deliver analog audio, but what effect does changing these settings have? If I choose a higher depth or rate, will it upconvert, etc.?
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iMac Late '15 5K 27" 4.0 Quad i7 24/512GB SSD OWC ThunderDock 2 Blu-Ray ±RW MBP '14 Retina 15" 2.6 16/1TB iPhone 7+ 128 Jet Black iPad Pro 128 + Cellular
FOR SALE: MP '06 Yosemite 8x3.0 24/240GB SSD RAID 0, 240GB SSD, 1.5TB HDD RAID 0, 1TB HDD, Blu-Ray±RW, Radeon HD 5770
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Posting Junkie
Join Date: Feb 2005
Location: 888500128
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If you're listening to 44kHz audio, set your output to 44kHz (or 88.2 kHz).
It will convert the sample-rate on the fly if you choose anything else, which costs CPU power AND reduces sound quality.
Bit depth is not a problem - just keep it at 24 bits.
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Mac Elite
Join Date: Oct 1999
Location: Carmel, IN, USA
Status:
Offline
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Interesting, thanks for the thoughts. So, in that case, if you increase the sample rate, it does in fact attempt to upsample even for this analog output?
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iMac Late '15 5K 27" 4.0 Quad i7 24/512GB SSD OWC ThunderDock 2 Blu-Ray ±RW MBP '14 Retina 15" 2.6 16/1TB iPhone 7+ 128 Jet Black iPad Pro 128 + Cellular
FOR SALE: MP '06 Yosemite 8x3.0 24/240GB SSD RAID 0, 240GB SSD, 1.5TB HDD RAID 0, 1TB HDD, Blu-Ray±RW, Radeon HD 5770
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Mac Enthusiast
Join Date: Sep 2000
Location: Somewhere
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Yes, the sample rate of what you're playing will be converted to whatever is set in Audio/Midi Setup if it doesn't match. Set it to 44.1 kHz for most stuff, and 48 kHz for video or DVD.
Setting the sample size to 24 bits allows you 8 bits of digital volume control without truncation or loss of precision, if programs are smart.
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Mac Elite
Join Date: Oct 1999
Location: Carmel, IN, USA
Status:
Offline
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Great information, thanks!
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iMac Late '15 5K 27" 4.0 Quad i7 24/512GB SSD OWC ThunderDock 2 Blu-Ray ±RW MBP '14 Retina 15" 2.6 16/1TB iPhone 7+ 128 Jet Black iPad Pro 128 + Cellular
FOR SALE: MP '06 Yosemite 8x3.0 24/240GB SSD RAID 0, 240GB SSD, 1.5TB HDD RAID 0, 1TB HDD, Blu-Ray±RW, Radeon HD 5770
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Mac Elite
Join Date: Oct 1999
Location: Carmel, IN, USA
Status:
Offline
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On a side note, I have a Cambridge Audio DacMagic which does upsample to 24/192 so I want to let that DAC upsample instead of the computer.
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iMac Late '15 5K 27" 4.0 Quad i7 24/512GB SSD OWC ThunderDock 2 Blu-Ray ±RW MBP '14 Retina 15" 2.6 16/1TB iPhone 7+ 128 Jet Black iPad Pro 128 + Cellular
FOR SALE: MP '06 Yosemite 8x3.0 24/240GB SSD RAID 0, 240GB SSD, 1.5TB HDD RAID 0, 1TB HDD, Blu-Ray±RW, Radeon HD 5770
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