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Old 19th September 2012, 02:49 AM   #2031
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Anyone's running a 2.1 system with stereo amp and sub plate amp? how do you configure the crossover between the two in linux.
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Old 19th September 2012, 03:12 AM   #2032
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MrSlim- Yep, I had the Speech Recognition thing and the whole bit.

doors666- Good question, My sound cards have 8 outputs, But I don't know yet how to control each one of them separately.
Maybe in Jack it is possible I haven't used it much yet.
I think I can use multiple outputs in ardour, But I think I was having problems last time I tried it, But that was back when I First started using linux and haven't got much past stereo at the moment.

FWIW

jer

Last edited by geraldfryjr; 19th September 2012 at 03:16 AM.
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Old 21st September 2012, 02:19 AM   #2033
MrSlim is offline MrSlim  Canada
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Quote:
Originally Posted by doors666 View Post
Anyone's running a 2.1 system with stereo amp and sub plate amp? how do you configure the crossover between the two in linux.
I'm in the process of setting that up myself. I'm using a separate crossover (Reckhorn F1 with mods(regs in the power supply and increased gain resistors), feeding it with 2 channels from the computer (Via a DCB1(Pass buffer)) and then taking the summed sub output and feeding the sub amp. It's pretty simple, or are we missing some details from your config?
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Old 21st September 2012, 03:17 AM   #2034
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Quote:
Originally Posted by MrSlim View Post
I'm in the process of setting that up myself. I'm using a separate crossover (Reckhorn F1 with mods(regs in the power supply and increased gain resistors), feeding it with 2 channels from the computer (Via a DCB1(Pass buffer)) and then taking the summed sub output and feeding the sub amp. It's pretty simple, or are we missing some details from your config?
What you want to do in f1 is what i want to do in the sound card. It has 7.1 outs. Tow channel output will goto plain b1 and then to topping. The .1 will goto the sub amp directly. I dont want the full range signal going to my speakers (alpair 7) as the power handling of the speakers drops big time if I feed them with full range signal. I want to setup a crossover at some 80 or 100hz. I can easily do this in windows with the M-Audio control panel applet by setting the crossover frequency and setting the speakers to small, havent figured out in linux.
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Old 21st September 2012, 11:16 AM   #2035
MrSlim is offline MrSlim  Canada
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Check out this link for ALSA (there is also a link for Pulse audio config on that page)
This page may also give you some clues..
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Old 26th November 2012, 01:17 PM   #2036
UnixMan is offline UnixMan  Europe
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Great news! m2tech have eventually released Linux (ALSA) driver for their products using their custom async USB2 protocol, such as the (1st) hiFace!

The driver is here:

https://github.com/panicking/snd-usb-asyncaudio/wiki

Drivers are distributed in source form (great!) and are ready to be integrated into DKMS for automatic build!

Just do:

Code:
sudo apt-get install dkms

sudo apt-get install kernel-headers-$(uname -r)

sudo apt-get install build-essential

sudo apt-get install git

git clone git://github.com/panicking/snd-usb-asyncaudio.git

sudo dkms add ./snd-usb-asyncaudio/ 

sudo dkms autoinstall
(likely, some of the above packages, such as dkms, may be already installed on your system).

Eventually, you'll get:
Code:
...
DKMS: build completed.

snd-usb-asyncaudio.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/«your_kernel_version»/updates/dkms/

depmod.......

DKMS: install completed.
...................
cleaning build area....

DKMS: build completed.
then
Code:
sudo modprobe -v snd-usb-asyncaudio
and here we go:
Code:
[39592.797430] usbcore: registered new interface driver snd-usb-hiface
Very well done, m2tech!
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Last edited by UnixMan; 26th November 2012 at 01:44 PM.
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Old 27th November 2012, 06:04 AM   #2037
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Cool.

The new devices, such as Hiface II, are working with the generic driver already.
There's no risk for them opening up their code nowadays. The new generations are sounding better anyhow.

One important point is that there are quite some suppliers out there, who licensed ( and still do ) HiFace I as OEMs ( e.g. Empirical Audio) . For them it means quite a competetive disadvantage to be tight to the propriatary driver. I reckon some of them must have been quite unhappy to see those M2Tech developments. Those guys felt kind of ripped-off for quite some time. I had discussions about it over at AA.

I'm sure we'll see more drivers coming up. But not because standard Linux becomes more popular.

I think these folks do have the huge Android market in mind. You can't afford to stay out of Android. Sooner or later we'll see full USB DAC support for Droids ( some devices - like Galaxy SIII got it working already). You can't let that market go.


Still, I'm appreciating those little "spin-offs".


RME also comes with a class compliant USB audio interface btw.. It's full Alsa and iOS compatible. Nice developments.

Last edited by soundcheck; 27th November 2012 at 06:13 AM.
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Old 7th December 2012, 09:57 AM   #2038
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Hiya all.
I did have a really quick glance through the first and last few pages, so please excuse me if these questions have been asked and answered already.

IF you use a motherboard with onboard optical or coaxial output (not a separate sound card), is there still an audible benefit in running a Linux o/s ?

Is there any reason I shouldn't choose a s1155 low power intel system ?

Finally, I've heard that using an SSD will result in superior audio replay ?

Any and all replies welcomed. Many thanks to all.......
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Old 12th December 2012, 10:33 PM   #2039
tastie is offline tastie  United States
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Quote:
Originally Posted by Old'n'Cranky View Post
IF you use a motherboard with onboard optical or coaxial output (not a separate sound card), is there still an audible benefit in running a Linux o/s ?
The only time you'll find an audible benefit from choosing one OS over another is if one OS supports talking directly to your hardware when another does not. For Windows, this would be ASIO; for Linux, ALSA hardware mode; for Mac OSX, Core Audio. I prefer Linux because it is infinitely customizable and lends itself well to operating as a headless server, which is what I think is the way to go for a dedicated audio PC. If your current OS supports talking directly to the hardware and you have no interest modifying source code or esoteric system settings, there is no advantage to Linux that I am aware of.

That said, I run Linux as my primary OS on all my computers, and I think it's great! If you're curious about it, try it out. It's free.

Quote:
Originally Posted by Old'n'Cranky View Post
Finally, I've heard that using an SSD will result in superior audio replay ?
If you are using the real time kernel, dumping the uncompressed audio files to RAM before playback, and everything is configured perfectly in your system, then an SSD will make no difference in audio quality. It WILL make for a better listening experience however, as the process of pulling the audio off the SSD and storing it in memory will be much faster than a typical hard disk.

Bad configurations can give the illusion that an SSD is producing better audio quality than a hard drive. This can happen when you don't have enough RAM and the operating system swaps some of your audio out to disk (as far as the software is concerned, the audio lives in RAM, but in reality it lives only on the disk). It can also happen if poorly written software is allowed to preempt your audio player and allocate enough RAM to move your audio into swap space. In this case where the audio is being read in real time off the disk, the SSD will perform MUCH better than the hard drive. If you set things up properly, this should never happen.

Hard drives also produce more noise and require more power, though this shouldn't matter if everything is living in RAM and your operating system is providing good power management (your OS will basically turn the hard drive off). Ideally, once the system boots and audio is playing, EVERYTHING will be in RAM and the hard drive will be idle. Puppy Linux is a great example of a distribution that has this feature built in. Check it out if you're concerned about this.
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Old 12th December 2012, 11:54 PM   #2040
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Gentlemen;

who knows how to install Ubuntu on iMac?

I burned a live CD with 12.10, but during the boot iMac ignores it.
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