From mboxrd@z Thu Jan 1 00:00:00 1970 From: Florian Faber Subject: Re: What does 0dB refer to? (Logitech USB Speakers) Date: Tue, 15 Apr 2008 05:52:13 +0200 Message-ID: <200804150552.13578.faber@faberman.de> References: <20080411204610.GA32413@tango.0pointer.de> <20080414172839.GA26513@tango.0pointer.de> <4803C78A.3020109@superbug.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from india820.server4you.de (static-ip-85-25-152-101.inaddr.intergenia.de [85.25.152.101]) by alsa0.perex.cz (Postfix) with ESMTP id D59AF24681 for ; Tue, 15 Apr 2008 05:52:26 +0200 (CEST) In-Reply-To: <4803C78A.3020109@superbug.co.uk> Content-Disposition: inline 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: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org On Monday 14 April 2008 23:07:22 James Courtier-Dutton wrote: > The aim of the dB values in the ALSA mixer is this. > > For Playback: > Set all the mixer controls to 0dB. > Send a sample digital signal from the CPU to the sound card. > The measured analog signal on the line-out should be the same for ALL > sound cards. Consumer levels are -10dBV while pro audio levels are +4dBu. And you have to be more specific what to measure. How about this: You do what you want with the consumer boards, and leave the pro guys alone. Pro drivers are not 'broken' if they don't implement such a 'feature', they are pro drivers. Flo -- Machines can do the work, so people have time to think. public key 6C002249 x-hkp://wwwkeys.eu.pgp.net