Bugzilla – Bug 9251
Line In is too quiet
Last modified: 2009-09-08 09:19:29 UTC
In doing testing with Line In, there was insufficient gain on input to Line In. As a result, the frequency response tends to be bass deficient. The simplest solution is to change SqueezeCenter to provide additional default gain. It can also be done in firmware.
The line in level is too low, and requires turning boom up very high. This in turn makes the bass go away, and makes line in sound bad. We need to increase the line in level. This can be done in 2 places -- we can get an extra 27 dB just by changing the line-in volume control in squeezecenter. Additionally I think it makes sense to put another gain stage in the DSP. If we're interested in doing this for 7.2, we can make a big improvement just by changing SC, and put off extra gain until 7.2.1. Otherwise, we can do both in 7.2.1. Dean, you make the call. -Caleb
let's do it in SC. Is that just a change to a default in the new plugin/setting?
I'll have to take a look exactly where theh change is, but yes, I think so.
Index: D:/eclipse/Boom/server/Slim/Player/Boom.pm =================================================================== --- D:/eclipse/Boom/server/Slim/Player/Boom.pm (revision 22810) +++ D:/eclipse/Boom/server/Slim/Player/Boom.pm (working copy) @@ -57,7 +57,7 @@ )], 'titleFormatCurr' => 4, 'lineInAlwaysOn' => 0, - 'lineInLevel' => 50, + 'lineInLevel' => 75, }; replace that 75 with whatever value should go in there
Caleb: What's the right default value here?
The problem isn't the default volume is too low -- I don't have a problem with the default. The problem is that the overall volume is too low when the volume is set to maximum. I can add another x15 (23 dB) in the already extant volume control by changing server side only. Additionally, I'll put more gain possiblities in a future DSP rev.
SVN 22860 -- changed maximum line-in gain from 0dB to +24 dB.