I am trying to get my Pi2 to work as a bluetooth speaker. It's going pretty well so far and I could get the phone to connect via bluetooth and play music to the speakers that is connected to a Creative Xmod. However, the sound quality is pretty terrible. There's constant hissing that I couldn't get rid of. The hissing presist when nothing is playing (ie: after rebooting the Pi, hissing comes back once power is applied to the USB card)
What I have tried so far:
[*] disabled audio dither (no luck as it is USB device that is hissing)
[*] reduced volume to 80% but still no luck
[*] added / removed tsched to /etc/pulse/default.pa (load-module module-udev-detect tsched=0)
lsusb:
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pi@raspberrypi ~ $ lsusb
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
Bus 001 Device 007: ID 041e:30d0 Creative Technology, Ltd
Bus 001 Device 004: ID 1131:1001 Integrated System Solution Corp. KY-BT100 Bluetooth Adapter
Bus 001 Device 005: ID 0930:6544 Toshiba Corp. Kingston DataTraveler 2.0 Stick (2GB)
Bus 001 Device 006: ID 2687:fb01
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pi@raspberrypi ~ $ lsmod
Module Size Used by
bnep 10206 2
rfcomm 34707 10
cfg80211 386516 0
snd_bcm2835 18365 2
evdev 9950 1
snd_usb_audio 104012 8
snd_usbmidi_lib 19617 1 snd_usb_audio
snd_hwdep 5902 1 snd_usb_audio
snd_seq_midi 4406 0
snd_seq_midi_event 5375 1 snd_seq_midi
snd_rawmidi 18265 2 snd_usbmidi_lib,snd_seq_midi
snd_pcm 73475 4 snd_bcm2835,snd_usb_audio
snd_seq 53078 2 snd_seq_midi_event,snd_seq_midi
snd_seq_device 5628 3 snd_seq,snd_rawmidi,snd_seq_midi
snd_timer 17784 4 snd_pcm,snd_seq
btusb 19617 0
snd 51038 25 snd_bcm2835,snd_usb_audio,snd_hwdep,snd_timer,snd_pcm,snd_seq,snd_rawmidi,snd_usbmidi_lib,snd_seq_device
bluetooth 287204 24 bnep,btusb,rfcomm
rfkill 16651 3 cfg80211,bluetooth
uio_pdrv_genirq 2958 0
uio 8119 1 uio_pdrv_genirq
pi@raspberrypi ~ $