Re: iphone 6(64gb) latency
Posted: June 20th, 7:25 am
Ok hope this isn't to long.
I did some latency testing on my three ios devices. Iphone 5, iphone 6 and ipad mini with retina (2)
Test setup was two DPA4061 mics. One next to iphone mic, one inside headphones. Mics into mixing desk and each the insert of each channel into 20MHz dual sampling oscilloscope. Two metal bars to create impulse. Not hyper accurate using cursors on scope to find transient edges and the scopes ms readout but good enough for this.
Latency Results for iphone 5
MTD
2.5ms buffer 11ms
5.6ms buffer 17ms
11.1 21ms
Garageband
No adjustments 17mS
IK Mic Room
Fast 17ms
Ultra Fast 11ms
Latency Results for iphone 6
MTD
2.5ms buffer 12.5ms
5.6ms buffer 18.5ms
11.1ms buffer 29ms
Garageband
No adjustments 18.5ms
IK Mic Room
Fast 18.5ms
Ultra Fast 12.5ms
Latency Reults for ipad mini retina
MTD
2.8ms buffer 12.5ms
5.6ms buffer 18.5ms
11.1ms buffer 30ms
Garageband
No adjustments 33ms
IK Mic Room
Fast 18.5ms
Ultra Fast 12.5ms
Cubasis
128 30ms
256 35ms
512 46ms
Auria
128 13ms
256 18.9ms
512 30ms
1024 54.5ms
2048 101ms
4096 198ms
PHEW!
Clearly the iphone 5 is faster but not by as much as I thought. Also I don't think I'll be trying Cubasis without an audio interface with direct monitoring.
However
These results may be interesting but some possible bugs showed. For anyone who is tempted to use IK Multimedia Mic Room (really cool) then you must reboot your device after installation. otherwise selecting ultra fast latency has no effect. Dont know if this effects any other apps they do.
In MTD I found that when it is closed down completely or a new project is created the app always reverts to 5.6ms buffer, even if 2.8ms was the projects setting. 2.8ms may be displayed in the tools pop-up but until you select a different buffer size and then back to 2.8 nothing changes and it sticks on 5.6ms.
I saw this across all three devices so I suspect there is a bug. may explain the horrid latency I was getting on the iphone 6 test i did. Also the headphone level setting reverts to a default on fully closing the app.
One other MTD bug. If you try and use another app as an IAA track effect then the track pan pot is all screwed up, like it's wired wrong. 12 o'clock is too hot. Fully left is fine level wise but only in the left channel (obviously). Fully right fades the signal to silence. Tried this with Mic Room and Jamup Pro. Same thing. Also tried same apps in Cubasis IAA track effect slot and pans just fine. Another bug in MTD. Any chance of a fix pwnified?
What's interesting is that none of the results quite get under the 10ms mark where latency becomes less annoying. I'll be looking for an audio interface with direct monitoring for sure. Sonic Port VX is closest for features from a mobile perspective but no good for using those lovely DPA4061's.
Apologies for the long post.
I did some latency testing on my three ios devices. Iphone 5, iphone 6 and ipad mini with retina (2)
Test setup was two DPA4061 mics. One next to iphone mic, one inside headphones. Mics into mixing desk and each the insert of each channel into 20MHz dual sampling oscilloscope. Two metal bars to create impulse. Not hyper accurate using cursors on scope to find transient edges and the scopes ms readout but good enough for this.
Latency Results for iphone 5
MTD
2.5ms buffer 11ms
5.6ms buffer 17ms
11.1 21ms
Garageband
No adjustments 17mS
IK Mic Room
Fast 17ms
Ultra Fast 11ms
Latency Results for iphone 6
MTD
2.5ms buffer 12.5ms
5.6ms buffer 18.5ms
11.1ms buffer 29ms
Garageband
No adjustments 18.5ms
IK Mic Room
Fast 18.5ms
Ultra Fast 12.5ms
Latency Reults for ipad mini retina
MTD
2.8ms buffer 12.5ms
5.6ms buffer 18.5ms
11.1ms buffer 30ms
Garageband
No adjustments 33ms
IK Mic Room
Fast 18.5ms
Ultra Fast 12.5ms
Cubasis
128 30ms
256 35ms
512 46ms
Auria
128 13ms
256 18.9ms
512 30ms
1024 54.5ms
2048 101ms
4096 198ms
PHEW!
Clearly the iphone 5 is faster but not by as much as I thought. Also I don't think I'll be trying Cubasis without an audio interface with direct monitoring.
However
These results may be interesting but some possible bugs showed. For anyone who is tempted to use IK Multimedia Mic Room (really cool) then you must reboot your device after installation. otherwise selecting ultra fast latency has no effect. Dont know if this effects any other apps they do.
In MTD I found that when it is closed down completely or a new project is created the app always reverts to 5.6ms buffer, even if 2.8ms was the projects setting. 2.8ms may be displayed in the tools pop-up but until you select a different buffer size and then back to 2.8 nothing changes and it sticks on 5.6ms.
I saw this across all three devices so I suspect there is a bug. may explain the horrid latency I was getting on the iphone 6 test i did. Also the headphone level setting reverts to a default on fully closing the app.
One other MTD bug. If you try and use another app as an IAA track effect then the track pan pot is all screwed up, like it's wired wrong. 12 o'clock is too hot. Fully left is fine level wise but only in the left channel (obviously). Fully right fades the signal to silence. Tried this with Mic Room and Jamup Pro. Same thing. Also tried same apps in Cubasis IAA track effect slot and pans just fine. Another bug in MTD. Any chance of a fix pwnified?
What's interesting is that none of the results quite get under the 10ms mark where latency becomes less annoying. I'll be looking for an audio interface with direct monitoring for sure. Sonic Port VX is closest for features from a mobile perspective but no good for using those lovely DPA4061's.
Apologies for the long post.