From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rene Herman Subject: Re: What does 0dB refer to? (Logitech USB Speakers) Date: Wed, 16 Apr 2008 17:37:03 +0200 Message-ID: <48061D1F.6060809@keyaccess.nl> References: <20080411204610.GA32413@tango.0pointer.de> <20080414172839.GA26513@tango.0pointer.de> <4803C78A.3020109@superbug.co.uk> <200804150552.13578.faber@faberman.de> <20080415131203.GA2818@localhost> <4804BCB8.9060707@keyaccess.nl> <48060D2F.2000701@keyaccess.nl> <480618F3.40707@keyaccess.nl> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from smtpq1.groni1.gr.home.nl (smtpq1.groni1.gr.home.nl [213.51.130.200]) by alsa0.perex.cz (Postfix) with ESMTP id AEAB2247F0 for ; Wed, 16 Apr 2008 17:34:07 +0200 (CEST) In-Reply-To: <480618F3.40707@keyaccess.nl> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: James Courtier-Dutton Cc: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org On 16-04-08 17:19, Rene Herman wrote: For now last time that I reply to myself (promise): > On 16-04-08 16:29, Rene Herman wrote: > >> On 15-04-08 16:33, Rene Herman wrote: >> On that note, I just acquired an Audigy 2 (SB0240) that I'm testing >> with and now that I'm paying attention to it due to this thread -- its >> 0 dB setting is very significantly louder (with everything behind the >> line-out constant ofcourse) than the 0 dB setting on my TerraTec DMX. >> >> James, I believe you are the emu10k1 person? Data: >> >> TerraTec DMX = ESS Canyon3D (ES1970MS-3D) + Sigmatel STAC9704T >> >> Creative Audigy 2 (SB0240) = Creative CA0102-ICT + Sigmatel STAC9721T >> (+ Crystal CS4382-KQ which seems to provide digital attenuation as well) >> >> At 0 dB master the Audigy 2 is much louder than the DMX is and audibly >> distorts. Judging by hearing, keeping the master at -16 dB (60 in the >> integer scale) gets things about the same. Was that scale provided by >> datasheet or just guessed? Especially the distortion would seem to >> indicate that something is actually doing analogue amplification at >> the 0 dB ALSA setting... > > Expanding, with the 'Line' control at 0 dB (74 integer) and 'Analog Mix' > at 0 dB (100 integer) everything does sound right with both 'Master > Capture' and 'Master' at full, and too faint with 'Master' at -16 dB. I > guess this indicates that it's something at the DSP side only? (sort of > loosing my way in this bewildering array of controls so if I need to be > guided to possibly say sensible things -- please do) When I do actually capture, -16 dB master is again the correct setting when playing back (with everything else still set to 0 dB as described above). It's then equally load as when directly monitored during recording. I expect then the Master dB scale needs to be adjusted down? If yes, I'll try to make very, very sure that -16 dB now is the correct new 0 dB. Rene.