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Post by Johnkenn on Nov 26, 2023 15:03:08 GMT -6
Right now I use a hearback system for headphones and connect via Spdif optical (apollo calls it adat - is that the same as optical?) when I go to 88.2 or 96, it cuts the channel count in half.
I normally have my mix/playback routed to adat 1-2…then vocal goes to adat 3, reverb adat 7-8. When I go to higher sr, I hear a mono version of my mix, in stereo 1-2 and then the vocal is somewhere it’s not supposed to be, no verb anywhere…
Can someone explain to me what’s happening? I should have 4 channels to work with, right? I would think adat 1-2 would still be stereo 1-2 up until I run out of the four channels…I know I’m not explaining myself well. I guess I could just use up I/O and connect the hearback analog…but I’d sure like to figure out how to route this via optical at 88/96
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Post by Tbone81 on Nov 26, 2023 15:31:46 GMT -6
Are in PT? Sounds like you may need to reroute your I/o settings?
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Post by copperx on Nov 26, 2023 15:33:49 GMT -6
Right now I use a hearback system for headphones and connect via Spdif optical (apollo calls it adat - is that the same as optical?) when I go to 88.2 or 96, it cuts the channel count in half. I normally have my mix/playback routed to adat 1-2…then vocal goes to adat 3, reverb adat 7-8. When I go to higher sr, I hear a mono version of my mix, in stereo 1-2 and then the vocal is somewhere it’s not supposed to be, no verb anywhere… Can someone explain to me what’s happening? I should have 4 channels to work with, right? I would think adat 1-2 would still be stereo 1-2 up until I run out of the four channels…I know I’m not explaining myself well. I guess I could just use up I/O and connect the hearback analog…but I’d sure like to figure out how to route this via optical at 88/96 I'm pretty sure that above 48khz, your ADAT outputs 1 & 2 will be your left channel, 3 & 4 you right channel. When ADAT goes into SMUX mode (above 48 kHz), you need two ADAT channels to carry 1 audio channel. |
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Post by chumley56 on Nov 26, 2023 15:39:11 GMT -6
Pretty sure you are running into the hardware spec and the limitations of optical. "ADAT Optical" is kind of it's own standard, limited to 48k for 8 channels unless using S/MUX which then yields 4 channels at up to 96K. SP/DIF optical is a 2 channel format that supports sample rates up to 96K.
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ericn
Temp
Balance Engineer
Posts: 16,099 
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Post by ericn on Nov 26, 2023 16:28:04 GMT -6
Pretty sure you are running into the hardware spec and the limitations of optical. "ADAT Optical" is kind of it's own standard, limited to 48k for 8 channels unless using S/MUX which then yields 4 channels at up to 96K. SP/DIF optical is a 2 channel format that supports sample rates up to 96K. As Chumley said at 88.1/96 ADAT only supports 4ch per output, and make sure your actually using ADAT, if either the UA or Hearback use the same jack for SPDIF optical make sure they are set to ADAT light pipe/ ADAT. |
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Post by doubledog on Nov 26, 2023 19:02:55 GMT -6
Since you said "Apollo", then I assume you mean UA Apollo and in that case you may have to re-route channel assignments in UA Console. Which Apollo do you have? I've got the Apollo 16, so mine does not have ADAT/SPDIF outputs, but I'd be checking that first. Also, if you are using the TosLink/ADAT optical, then when you switch to higher SR, it is using SMUX. That means the hearback system (or whatever is downstream) has to also support S/MUX or you are going to get weird results (or no results). I don't think the Apollo can run internally at 88.2/96 and simultaneously output at 44.1/48. help.uaudio.com/hc/en-us/articles/209496906-Using-External-Digital-Gear-With-Your-Apollo-Digital-Clocking-Primer-ADAT & S/MUX A single ADAT cable (TOSLINK) in each direction is all that is required to pass 8 channels of digital audio at sample rates of 44.1 or 48 kHz. However, 2 cables are required in each direction to achieve 8 channels at 88.2 or 96 kHz, or 4 channels at 176.4 or 192 kHz. You can just use 1 cable each way if 4 channels is enough at 88.2 or 96 kHz or 2 channels is enough at 176.4 or 192 kHz. Please note that the secondary device will also need to support the S/MUX protocol in order to function as expected at higher sample rates. S/PDIF On an Apollo Firewire or an Apollo 8, the S/PDIF format offers stereo I/O over a RCA-type (coaxial) digital connection. The Apollo Firewire and Apollo 8 offer simultaneous usage of the S/PDIF ports and ADAT ports. The optical TOSLINK ports on the Apollo 8p can be switched between S/PDIF or ADAT via the Console > Settings > Hardware page. S/PDIF and ADAT cannot be used simultaneously on an Apollo 8p. |
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Post by svart on Nov 27, 2023 21:21:47 GMT -6
Smux. At double the rates, they half the track count because there's a maximum amount of data the adat standard can transfer.
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Post by mattbroiler on Nov 28, 2023 13:16:28 GMT -6
while in 88.2/96 sample rate mode try going into the Apollo cue routing and re-configure it with the available channels 1-4?
something like playback goes to 1/2 vocals 3 reverb 4 and save that off as an apollo console config preset, then you can load up the appropriate routing template for different sample rates
the ADAT channels may jump around somehow when you switch to higher sample rates and you definitely will lose anything going to channels 5-8. If you can connect two adat cables to your hearback system you might be able get back up to 8 channels at 88.2/96
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