Soundcards

Tested sound cards

We typically run the sound system with 48000 Hz sampling rate and periods of 2 ms (96 samples). The measured hardware delay (combined input and output), as caused by block processing, USB BUS protocol and anti-aliasing filters is given below. Please note that the values for USB devices may vary slightly between jack starts and sound-card reconnections:

	period size	delay	delay
Focusrite Scarlett Solo 3rd gen	96	429 samples	8.9 ms
	48	238 samples	5.0 ms
	24	136 samples	2.8 ms
	12	94 samples	2.0 ms
Audient EVO16 [1]	96	284 samples	5.9 ms
	64	196 samples	4.1 ms
	48	164 samples	3.4 ms
	32	120 samples	2.5 ms
	24	104 samples	2.2 ms
	16	82 samples	1.7 ms
TASCAM US-2x2	96	518 samples	10.8 ms
	48	316 samples	6.7 ms
	24	210 samples	4.4 ms
	12	165 samples	3.4 ms
TASCAM US-100	96	510 samples	10.6 ms
TASCAM US-16x08	96	623 samples	13.0 ms
	48	327 samples	6.8 ms
Behringer u-phoria UMC22 [2]	96	512 samples	10.7 ms
	48	320 samples	6.7 ms
Mackie Onyx 2-2	96	587 samples	12.2 ms
	48	364 samples	7.6 ms
	24	262 samples	5.4 ms
Presonus Audiobox USB	96	593 samples	12.4 ms
	48	364 samples	7.6 ms
Superlux E205U	96	618 samples	12.9 ms
	48	372 samples	7.8 ms
ConnectAUDIO 2/4 [3]	96	652 samples	13.6 ms
	48	620 samples	13.0 ms
	144	844 samples	17.6 ms

Also the HiFi Berry ADC+ Pro (and probably other HiFi Berry devices as well) can be used if after installation the instructions documented here are followed.

[1] Seems to be unstable on Raspberry Pi. On Desktop PCs, block sizes of 48 samples at 48 kHz are no problem.

[2] Also supports 32 kHz which is very useful in case of low upstream bandwidth.

[3] Seems to be unstable on Raspberry Pi, and with short buffers also on Desktop PCs.

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