Latency Delay - Martin Audio Ikon IK81 User Manual

iK81 / iK42
NOTE: That if the contact closure port is being driven, or if the Aux Style is set to one of the State modes, this will override the
snapshot recall setting in the menu (or in Vu-Net). Also under these conditions, the snapshot menu items are not accessible,
and the Home screen will show the Snapshot number as a reminder.
See also Snapshots.

Latency delay

All Digital Signal Processing, and conversion between different formats of signal – analogue/digital/network etc., necessarily
introduce some delay (latency) to the signal path. Of course, we strive to minimise these latencies. Small as they are, it is
sometimes useful to know their precise values. The following describes the principal latencies introduced by various parts of the
Device product:
Input / Output Latencies
Analogue Input
OR Digital input at 96 KHz sample rate
OR Digital input at 48 KHz sample rate
Analogue Output
OR AES3 Output
OR Dante Output
Processing Latencies (limited to a minimum of 1.53ms):
Input HiShelf FIR
LIR Linear Phase crossover
VxLim Limiter (VX mode off)
OR VxLim Limiter (VX mode on)
** This latency figure is calculated using the crossover High-pass frequency (in kHz)
‡‡ This latency figure is calculated using the Vx Split frequency (in kHz)
Important tip: The processing latency is constant at 1.53ms unless LIR crossover filters or FIR HiShelf EQs are used, so normally
you would just need to add the Input and Output delays to this constant value. If LIR or FIR are in use, the Processing latency of
a Drive Module may increase beyond this figure. The Drive Module Latency may be viewed on the Latency page of the relevant
Input DSP channel. This can be accessed by pressing Input then down until the latency page is reached.
When LIR, is used the Vx Limiter can take the overall latency above the 1.53ms. When high pass frequency is set below 40Hz the
filter will automatically revert to Linkwitz riley, this is set so that the latency will not exceed 30ms as stated.
Note that the latency reported on the Latency screen in the utilities menu does not include the Input/Output latencies.
When using input FIR filters, LIR or VX Limiters always check the view latency screen to see the latency attributed to that Drive
Module.
Example:
Input/Output
Analogue Input
Analogue Output
Processing
Input HiShelf FIR (Off)
LIR Linear Phase crossover (500Hz)
VxLim Lim (VX mode on, 1KHz Fsplit)
Total
Note that the latencies within a Drive Module are equalised among outputs of that Drive Module. That is, padding delay will be
automatically added to some outputs such that the total latency is the same in each output of a Drive Module.
This latency equalisation does not extend outside a Drive Module, so Drive Modules are not guaranteed to have the same latency
as one-another.
iK81 / iK42 User Guide V2.3
USER GUIDE
0.385ms
0.5ms
0.66ms
0.402ms
0.1ms
0.5ms
0.48ms (0ms if set to 'Off')
1.19ms/Fhp(kHz), limited to 30ms maximum **
0.12ms/Fhp(kHz), limited to 1.53ms maximum **
0.358ms/Fsplit(kHz), limited to 1.53ms max ‡‡
0.385ms
0.402ms
0ms
2.38ms
0.358ms
3.525ms
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