[linux-audio-user] Quattro USB (EMI 6|2m)

Jorma R rjorma at jippii.fi
Thu Apr 29 14:15:23 EDT 2004

> Hallo,
> Jorma R hat gesagt: // Jorma R wrote:
> > I have the EMI 6|2m. The card works ok with Jackd - at 16-bit and with a 
> > large period size. The card records cleanly at 24-bit too but gives 
> > strange noise when connecting Jack ports.
> > 
> > So it works but not perfectly.
> > 
> > If any suggestions on how to ipmrove the performance with jackd would be 
> > more than welcome.
> Are you using "even" samplerates, that is, divisibly by 1000? 48000
> is much better than 44100
> Ciao
> -- 
>  Frank Barknecht

Thanks for the advice. Actually the card does perform a bit better at 
48000. The thing is that at 48000 I get only 6 capture ports at 24-bit - 
no playback.

Suprisinly I got rid of the noise by setting -n 512 -p 4. 

What I haven't figured out is how to make the EMI capture at 6*24/44100 
and playback at 2*16/44100 which would be the maximum performance by 
this box. In other words how to tell Jack to use certain altset of the 
playback interface.

With the -S switch I get 16-bit input and output but 24-bit capture at 
least sounds like a nice idea...

Any suggestions on how to make that happen?

I've tried using pcm slaves from the .asoundrc as Steve Harris suggested 
earlier but ended up with Segmentation Faults and missing library - 
notifications only...

ALSA lib pcm.c:1939:(snd_pcm_open_conf) Cannot open shared library 



Sano ei kuukausimaksuille. Hanki Suomen edullisin kuukausimaksuton GSM-liittymä osoitteesta http://www.saunalahti.fi. Puhelut vain 0,109snt/min.

More information about the Linux-audio-user mailing list