[linux-audio-user] [OT] recording levels (mismatch)

Anahata anahata at treewind.co.uk
Wed Oct 13 04:09:19 EDT 2004

On Wed, Oct 13, 2004 at 09:24:02AM +0200, Christophe Vescovi wrote:
> output impedance of at least 1K. The Line in full scale output is 
> however 1.5Veff. Since -10dBV = 0.32Veff and +4dBu = 0.775 Veff

No, 0dBu is 0.775V and +4dBu is 1.23Vrms which is close to the 
specified input of the SB.
Looks like it's nominal +4dBu input, which would explain everything.

> In any case you should consider using a preamp or a cheap console to 
> adjust the levels since the SBlive level adjustement is done after 
> Analog to Digital Conversion, a bad thing.

Agreed; in an earlier message I did suggest conversion in the digital
domain, but amplifying the analog signal is certainly a better solution,
if more expensive.

anahata at treewind.co.uk       Tel: 01638 720444
http://www.treewind.co.uk    Mob: 07976 263827

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