Hi, the problem is the bass. Initially, It was difficult to hear differences by playing two sounds one after the other. So until you have listened music on a bass fixed Freerunner, you would say it is quite ok.
I was only able to hear the difference after taking one original Freerunner and one with Bass-Fix applied. After a while you get that there *is* a difference in low frequencies. What I have done is this test: create a sinus sweeping from 10 to 100 hz. Without bass fix you can't hear it before it comes to the 50 hz range. sox -n -t wav - synth 10 sine 10-100 >file.wav This can be seen on scope outputs as shown here: http://freeyourphone.de/portal_v1/viewtopic.php?f=20&t=1723&p=17279&hilit=bass+fix#p17251 Can you please compare you device? One effect may also be the input impedance of your line card. Did you connect it in parallel to a headset? BR, Nikolaus Am 22.09.2010 um 23:57 schrieb Gennady Kupava: > Hi, list, > > Many gossips flying around about bad fr's audio subsystem quality. I > promised to proove that FR audio subsystem is good, just default > headphones quality below anything. > > As today finally i overcome my lazyness and soldered 2.5mm->3.5mm jack, > and i am almost content with high sound quality of my Sennheiser CX300 > II+FR, i decided to do some basic testing. > > Test environment > ================ > I got 2 recodings - 60 seconds of white noise and 120 seconds of piano > +voice, audacity to do spectrum analisys, cable 3,5mm<->3,5mm to connect > my old m-audio revolution 7.1 card to line-in to freerunner. > > White noise > =========== > 1. White noise were generated by audacity original file: > http://www.bsdmn.com/openmoko/audioquality/white.wav > Spectrum: > http://www.bsdmn.com/openmoko/audioquality/whitenoise.png > 2. Same noise recorded then audio-out were connected to audio-in of > sound card: > http://www.bsdmn.com/openmoko/audioquality/rec_white_directcable.wav > Spectrum: > http://www.bsdmn.com/openmoko/audioquality/whitenoise_direct.png > 3. Same noise played on FR, connected to line-in of sound card: > http://www.bsdmn.com/openmoko/audioquality/rec_white_fromfrerunner.wav > Spectrum: > http://www.bsdmn.com/openmoko/audioquality/whitenoise_fr.png > > Conclusion on white noise: > I see no frequency cut-offs. spectrograms look very well and close to > original file. Only exception is fall below 20Hz in fr case, but i am > unsure if any headset can reproduce such frequences very well. > > Real song > ========= > 1. Original piece of song (piano+voice): > http://www.bsdmn.com/openmoko/audioquality/song.wav > Spectrum: > http://www.bsdmn.com/openmoko/audioquality/song.png > > 2. Same file played on freerunner and captured on line-in of sound card > http://www.bsdmn.com/openmoko/audioquality/rec_song_fromfr.wav > Spectrum: > http://www.bsdmn.com/openmoko/audioquality/song_fromfr.png > > Conclusion on piano+voice: > I can't distingush difference in quality while replaying original file > or file recorded from freerunner. Spectrum show almost no difference. > > Overall conclusion > ================== > Seem audio quality completely depends on quality of headphones. You may > try to distiguish original song and song from fr youself, only do not > forget to normalize volume before attempting to do this. > > regards, > Gennady. > > > _______________________________________________ > Openmoko community mailing list > community@lists.openmoko.org > http://lists.openmoko.org/mailman/listinfo/community _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community