Monthly Archives: March 2014

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Cubox-i

March 27, 2014 9:18 am | Leave a Comment |

Dupa aproape 4 luni de asteptare a sosit

imagine

1. Set-up a mpd server – http://imx.solid-run.com/forums/viewtopic.php?f=8&t=787

a. To optimize the system, you can also replace NTPd with ntpdate. This one is said deprecated by ARchLinux but fully functionnal. It avoid continuous requests done by NTPd which are mosts of the time uneeded for an audio streamer. The main idea here is removing NTPd, installing ntpdate and using a cron job once a day to update the real time clock.

de scos din rc si pus in cron o data la 2 ore

systemctl disable ntpd

crontab -e

0 * * * *  /usr/sbin/ntpd -qg

2. [root@alarmcbi ~]# mount /media/music/
mount error: cifs filesystem not supported by the system
mount error(19): No such device
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

De vazut de ce nu merge cu cifs

3. Static IP Address – Optional – pt varianta finala

aici este “/usr/bin/ntpd -gq || true”

4. modify /etc/hostname

5. update mpd-conf

6. check alsa samplerate daca merge cu Sox

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Good recordings

March 19, 2014 10:05 am | Leave a Comment |

Diana Krall, live in paris. All of them really
Dave Matthews, any CLA mixed.
Norah Jones, Come Away.
All of the Donald Fagen stuff and this has the eztremes of the spectra, but Its all within range +-
Zac Brown. (The iast two)
Any of the Joe Lavano on Blue Note.
Early Dr. Dre stuff.

—————-

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Tube vs SS

March 7, 2014 5:31 pm | Leave a Comment |

Dintr-un review:

 

One reason audiophiles (and musicians) like
valve amplifiers is that they overload very
gracefully… so gracefully that it’s difficult to
perceive they’re overloaded at all. Whereas
solid-state amplifiers go straight into hard
clipping at which point they suddenly
generate (literally) hundreds of high-level
odd- and even-order harmonic distortion
components, valve amplifiers clip ‘softly’
and, when they do, generate only a few,
low-order harmonic distortion components,
many of which sound so pleasant to the ear
(being predominantly low-order and evenorder
harmonics) that it’s difficult (perhaps
impossible) to hear they’re overloading at
all. This ‘soft clipping’ effect also makes it
difficult to measure the exact output power
of valve amplifiers, because soft clipping
is also difficult to observe visually on an
oscilloscope screen, whereas hard clipping
is instantly visible.

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DAC – o noua abordare

March 4, 2014 12:10 pm | Leave a Comment |

 La momentul in care am aflat de noua abordare a DAC-urilor de la Chord s-au aprins niste beculete (de fapt ei au inceput cu DAC64)

A fost primul DAC care nu folosea un chip DAC per se, denumirea tehnologiei aleasa de ei a fost The Pulse Array DAC. Read More →

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Filtre de reconstructie ce (nu) fac ele si de ce

March 3, 2014 1:45 pm | Leave a Comment |

un exemplu vizual foarte bun.

http://www.diyaudio.com/forums/pc-based/251845-over-sampling-44-1khz-wav-files-4.html#post3840374

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Kill brutefir

March 2, 2014 10:57 pm | Leave a Comment |

Pt ca brutefir ramane “agatat”, mpd-ul se blocheaza.

Cheap and dirty trick:

1. script pt kill zombie process (nu imi aduc aminte de unde l-am luat)

ps -eo pid,ppid,state,user,comm | awk 'BEGIN { count=0 } $3 ~ /Z/ { count++; system ("kill -9 " $2) } END { print "\n" count " Zombie(s) were slayed" }'

2. adaptat pt rc.local de aici https://coderwall.com/p/x0fqmw

#!/bin/bash
#This script run every 1 seconds

while (sleep 5 && ps -eo pid,ppid,state,user,comm | awk 'BEGIN { count=0 } $3 ~ /Z/ { count++; system ("kill -9 " $2) } END { }' ) &
do
        wait $!
done

3. adauga script in /etc/rc.local

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REW

March 2, 2014 3:30 pm | Leave a Comment |

De obicei in momentul inca care ajungi acasa cu noile boxe ai impresia ca parca nu ar suna la fel ca in show room, dupa cateva zile esti sigur ca nu suna la fel si atunci incepe distractia. Incepator fiind in ale HiFi-ului m-am apucat sa studiez problema. Dupa nenumarate articole/posturi pe diverse forumuri in care se laudau calitatile incontestabile ale cablurilor interconect, apoi cablurilor de alimentare, sau a power conditioner-elor presarate cu catifelari ale sunetelor si noi detalii aparute din senim la piese ascultate de zeci de ani am inceput sa ma indoiesc de bruma de fizica pe care o invatasem in liceu.

Dar pe ici pe colo mai aparea inca o sintagma prepararea camerei de auditie, bass trapuri, difuzere si alte minunatii. La un moment dat am dat peste un articol care se intitula Is the rooom lying to you? sau asa ceva in care se explica faptul ca de fapt boxele + camera formeaza un singur sistem si nu numai boxele. Cool, dar ce aveau oamenii aia prin camerele lor de auditie nu prea se potriveau la mine in sufragerie si in ciuda faptului ca am noroc de o sotie cu WAF mare, totusi ma vedem mutat in curte impreuna cu sistemul audio si bass trapuri in cortul de 4 persoane. Asa ca aveam nevoie de o abordare mai subtila :). Pfff D.R.C. (Digital Room Correction) scria pe mine, in mintea mea asta rezolva totul cu minimul de impact vizual asupra camerei.

Read More →

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