I've got an Abit AT7 motherboard with RealTek ALC650 audio. It sounds okay with 5.1 speakers, but when I plug headphones in, it's piss: no bass at all. It seems like everything under 200Hz has been completely filtered from the left/right channels. The result is like some kind of a high-frequency skull drill.
Exploring the alsamixer options, I tried disabling the center/bass output but there's no difference in the basic stereo output. Still no bass. /proc/asound/card0/ac97#0 shows a "Loudness" option which I suspect may be helpful if it's like "loudness" on old radios (basically a bass boost), but I can't find any corresponding mixer setting. ===START=== 0-0/0: Avance Logic ALC650 rev 0 Capabilities : DAC resolution : 20-bit ADC resolution : 18-bit 3D enhancement : Realtek 3D Stereo Enhancement Current setup Mic gain : +0dB [+0dB] POP path : pre 3D Sim. stereo : off 3D enhancement : off Loudness : off Mono output : MIX Mic select : Mic1 ADC/DAC loopback : off Extended ID : codec=0 rev=1 AMAP LDAC SDAC CDAC DSA=0 SPDIF DRA VRA Extended status : SPCV LDAC SDAC CDAC SPDIF=3/4 VRA PCM front DAC : 44100Hz PCM Surr DAC : 44100Hz PCM LFE DAC : 44100Hz PCM ADC : 48000Hz SPDIF Control : Consumer PCM Copyright Category=0x2 Generation=1 Rate=44.1kHz ===END=== Anyone know how to keep it from eating all the bass, or am I stuck on that? If I got a DAC box for the S/PDIF output, would the output there be any better? I'm out of PCI slots, so I'd like to avoid adding a new sound card as it means a whole new motherboard.
signature.asc
Description: Digital signature
