Thanks again.
I tried your suggestions. It made no difference. The debug info follows -
Audirvana Mac Version 3.5.34 (3564)
macOS 10.14.6 with 65536MB RAM
Registered to Stephen Ng
SIGNAL PROCESSING:
Polarity Inversion:
Globally: OFF
Per track: ON
Effects plugins NOT ACTIVE
UPSAMPLING:
SoX not in use
SoX filter parameters
Bandwidth at 0dB = 99.5
Filter max length = 30000
Anti-aliasing = 100
Phase = 66
AUDIO VOLUME:
Max allowed volume: 100
Replay Gain: None
SW volume control: OFF
LIBRARY SETTINGS:
Sync list: 4 folders
AUTO: /Volumes/Digital_Music/HD_Tracks
AUTO: /Volumes/Digital_Music/Kerry
AUTO: /Volumes/Digital_Music/MyRIPs
AUTO: /Volumes/ThunderBay/Music/Music Purchased
iTunes/Music library synchronization: not synchronized
Library database path: /Users/sng/Library/Application Support/Audirvana/AudirvanaPlusDatabaseV2.sqlite
ACTIVE STREAMING SERVICES
=================== AUDIO DEVICE ========================
CoreAudio audio path, buffer I/O frame size: 512
Max. memory for audio buffers: 62464MB
Local Audio Engine:
Exclusive access: Enabled
Integer mode: Enabled
Preferred device:
iFi (by AMR) HD USB Audio Output
Model UID:iFi (by AMR) HD USB Audio:20B1:3008
UID:AppleUSBAudioEngine:iFi (by AMR):iFi (by AMR) HD USB Audio:00000000:1
Active Sample Rate: 192kHz
Hog Mode is off
Bridge settings:
Sample rate limitation: none
Sample rate switching latency: none
Limit bitdepth to 24bit: OFF
Mute during sample rate change: OFF
Selected device:
Local audio device
ID 0x53 iFi (by AMR) HD USB Audio Output Manufacturer:iFi (by AMR)
Model UID:iFi (by AMR) HD USB Audio:20B1:3008 UID:AppleUSBAudioEngine:iFi (by AMR):iFi (by AMR) HD USB Audio:00000000:1
8 available sample rates up to 384000Hz
44100
48000
88200
96000
176400
192000
352800
384000
Audio buffer frame size : 58 to 4096 frames
Current I/O buffer frame size : 512
Volume Control
Physical: No
Virtual: No
MQA capability
Auto-detect MQA devices: Yes
MQA Renderer device
DSD capability: DSD via PCM 1.0
Device audio channels
Preferred stereo channels L:1 R:2
Channel bitmap: Ox3, layout:
Channel 0 mapped to 0
Channel 1 mapped to 1
Audio channels in use
Number of channels: 2
Use as stereo device only: No
Simple stereo device: Yes
1 output streams:
Number of active channels: 2, in 1 stream(s)
Channel #0 :Stream 0 channel 0
Channel #1 :Stream 0 channel 1
Stream ID 0x54 2 channels starting at 1
16 virtual formats:
2 ch Mixable linear PCM Interleaved 32 little endian Signed Float 384kHz
2 ch Mixable linear PCM Interleaved 32 little endian Signed Float 352.8kHz
2 ch Mixable linear PCM Interleaved 32 little endian Signed Float 192kHz
2 ch Mixable linear PCM Interleaved 32 little endian Signed Float 176.4kHz
2 ch Mixable linear PCM Interleaved 32 little endian Signed Float 96kHz
2 ch Mixable linear PCM Interleaved 32 little endian Signed Float 88.2kHz
2 ch Mixable linear PCM Interleaved 32 little endian Signed Float 48kHz
2 ch Mixable linear PCM Interleaved 32 little endian Signed Float 44.1kHz
2 ch Non-mixable linear PCM Interleaved 32 little endian Signed Integer 384kHz
2 ch Non-mixable linear PCM Interleaved 32 little endian Signed Integer 352.8kHz
2 ch Non-mixable linear PCM Interleaved 32 little endian Signed Integer 192kHz
2 ch Non-mixable linear PCM Interleaved 32 little endian Signed Integer 176.4kHz
2 ch Non-mixable linear PCM Interleaved 32 little endian Signed Integer 96kHz
2 ch Non-mixable linear PCM Interleaved 32 little endian Signed Integer 88.2kHz
2 ch Non-mixable linear PCM Interleaved 32 little endian Signed Integer 48kHz
2 ch Non-mixable linear PCM Interleaved 32 little endian Signed Integer 44.1kHz
16 physical formats
2 ch Mixable linear PCM Interleaved 32 little endian Signed Integer 384kHz
2 ch Mixable linear PCM Interleaved 32 little endian Signed Integer 352.8kHz
2 ch Mixable linear PCM Interleaved 32 little endian Signed Integer 192kHz
2 ch Mixable linear PCM Interleaved 32 little endian Signed Integer 176.4kHz
2 ch Mixable linear PCM Interleaved 32 little endian Signed Integer 96kHz
2 ch Mixable linear PCM Interleaved 32 little endian Signed Integer 88.2kHz
2 ch Mixable linear PCM Interleaved 32 little endian Signed Integer 48kHz
2 ch Mixable linear PCM Interleaved 32 little endian Signed Integer 44.1kHz
2 ch Non-mixable linear PCM Interleaved 32 little endian Signed Integer 384kHz
2 ch Non-mixable linear PCM Interleaved 32 little endian Signed Integer 352.8kHz
2 ch Non-mixable linear PCM Interleaved 32 little endian Signed Integer 192kHz
2 ch Non-mixable linear PCM Interleaved 32 little endian Signed Integer 176.4kHz
2 ch Non-mixable linear PCM Interleaved 32 little endian Signed Integer 96kHz
2 ch Non-mixable linear PCM Interleaved 32 little endian Signed Integer 88.2kHz
2 ch Non-mixable linear PCM Interleaved 32 little endian Signed Integer 48kHz
2 ch Non-mixable linear PCM Interleaved 32 little endian Signed Integer 44.1kHz
Local devices found : 2
Device #0: ID 0x53 iFi (by AMR) HD USB Audio Output Manufacturer: iFi (by AMR) Model UID: iFi (by AMR) HD USB Audio:20B1:3008 UID: AppleUSBAudioEngine:iFi (by AMR):iFi (by AMR) HD USB Audio:00000000:1
Device #1: ID 0x47 iMac Pro Speakers Manufacturer: Apple Inc. Model UID: Speaker UID: BuiltInSpeakerDevice
UPnP devices found : 1
Device #0: ID 0x0 DMR-BWT955 UID: uuid:4D454930-0300-1000-8000-80C7552AA6D7 Location: http://10.0.0.3:60607/80C7552AA6D7/Server1/ddd