Dear Freerunner owners in the EU harmonized market, a known problem of the Neo Freerunner design is that the headset output lacks some low frequency signals (bass). Thererfore music played through the headsets does not sound as expected and compared to other digital music players. There is an improvement rework by adding larger coupling capacitors to the output amplifier. This became known as the Bass Rework (http://wiki.openmoko.org/wiki/GTA02_bass_fix ). Although there is a description of a rework solution (http://people.openmoko.org/andy/additional-headset-audio-caps.pdf ) we do not expect that you can do it yourself and not in the required quality. Just a note what the problem is: we need 47 uF in 0805 dimensions and they are a little expensive and difficult to get and space is very close. Therefore, we have worked on a professional approach.
With the help of a local SMD specialist company in Munich, we can now offer a rework service to those who want to improve audio quality. The price is 49 EUR (incl. German VAT) plus shipment. Details can be found at: http://www.handheld-linux.com/wiki.php?page=Bass-Rework Finally a note of caution: acoustic quality is very subjective so that we can't guarantee that the result is good enough for your expectations. We can only guarantee that there is a technical improvement. Nikolaus Schaller Some Pictures How the rework looks like: http://www.handheld-linux.com/images/Bass-Rework1.jpg Oscilloscope signals of a sine wave sweeping from 10 Hz to 100 Hz (for an original unit and for a reworked unit): http://www.handheld-linux.com/images/Bass-Rework2.jpg http://www.handheld-linux.com/images/Bass-Rework3.jpg -------------------------------------------------------------------- Mobile Office Solutions by Golden Delicious Computers GmbH&Co. KG Buchenstr. 3 D-82041 Oberhaching +49-89-54290367 http://www.handheld-linux.com AG München, HRA 89571 VAT DE253626266 Komplementär: Golden Delicious Computers Verwaltungs GmbH Oberhaching, AG München, HRB 16602 Geschäftsführer: Dr. Nikolaus Schaller Digital Tools for Independent People -------------------------------------------------------------------- _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community