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 17:19:15 +0200 Message-ID: <480618F3.40707@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> 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 E8ED4247D4 for ; Wed, 16 Apr 2008 17:16:19 +0200 (CEST) In-Reply-To: <48060D2F.2000701@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 16:29, Rene Herman wrote: > On 15-04-08 16:33, Rene Herman wrote: > >> mute/minimal. Bit of a maintenance chore, and the usefulness depends >> on how much level variation there actually is generally. Are we in >> essence only talking about Lennart's buggy USB crap or is this more >> involved? > > 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) Rene.