Re: solved? Re: [linux-audio-user] [OT] recording levels (mismatch)

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Subject: Re: solved? Re: [linux-audio-user] [OT] recording levels (mismatch)
From: MarC (marc_contrib_AT_ramonvinyes.es)
Date: Fri Oct 15 2004 - 23:16:17 EEST

Mark Knecht wrote:

>On Fri, 15 Oct 2004 17:11:50 +0100, anahata <anahata_AT_treewind.co.uk> wrote:
>
>
>>On Fri, Oct 15, 2004 at 08:19:36AM -0700, Erik Steffl wrote:
>>
>>
>>
>>> sony STR-SE581
>>> voltage 150mV
>>> impedance 10kOhms
>>>
>>> the creative.com knowledge base search revealed:
>>> Line In Full Scale Input 2.0 Vrms
>>> Line In Impedance 10k ohms
>>>
>>> what is Vrms? I guess it has something to do with voltage... should
>>>2.0 Vrms play nicely with 150mV?
>>>
>>>
>
>
>
rms is a way to mesure AC voltage,
In case of a sine, 2Vmrs corresponds with a sine of 2*sqrt(2) V of
amplitude.
take a look at http://www.doctronics.co.uk/rms.htm
(it's always good to learn new things :)

>Basically that a 2V sine wave on the input of the Sound Blaster would
>give you full volume.
>
>On the other hand, if the Sony only puts out 150mV at full volume then
>you are not driving the SB very hard.
>
>Couple this with a 10K output impeadance and a 10K input impedance and
>your 150mV is cut in half to 75mV into a 2V input. That's pretty low
>in my mind...
>
>
>
>
>

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