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View Full Version : Amplify the output of a SB Live card with some "virtual amplifier"?


rui
14th May 2002, 21:21
I come to you guys asking for advice on the following matter:

I have a Sound Blaster Live 1024. This sound card doesn’t have any amplifier built in, has you know. I have both the main volume and the wav volume in the max values. I don’t have access to an external amplifier because the computer is in my room, and my stereo is in the living room and I don’t want cables crossing the house. I use the latest Bsplayer with DeDynamic filter to play my xvid encodes, which have ABR mp3 sound, created using BeSweet.
I had to say this for you to understand that my problem doesn’t come from here.

I have two sets of headphones: one is a small Sony set that I had from my Sony Walkman. These headphones have some kind of amplification, because they have a sound volume controller, so this way I can up the sound that comes out of the Live card.

The other headphone set is a Sennheiser HD 520 model. For those that don’t know them, Sennheiser headphones are probably one of the best available. These headphones don’t have any amplification built in.
Now my problem: when I use the Sennheiser set, the volume is very low, probably because the headphones are so good that the Live card doesn’t have enough output power to give me a high enough sound. I can have them on, and be watching a movie in max volume, and still hear when some member of my family talks to me in moderate voice.
When I use the Sony headphones, which have some kind of amplifier on them, I have a sound volume much higher.
BUT if I compare the sound quality between the two sets, the sound that comes from the Sennheiser set is MUCH better than the Sony set. It’s lower, but much superior. The sound just have more “body”, I can’t express this in words.

So my question: does any one know of any kind of software amplifier that I could use? I mean, for the musicians out there, you probably know that one could load a software midi synthesizer, like Yamaha XG, so you could have good MIDI even if your sound card sucked.
I wanted to know if anybody knows of a similar thing (software amplifier).

Thanks in advance for all your help, and sorry for the long post.

DSPguru
14th May 2002, 21:43
virtual amplifying is bounded to normalized signals.
if your signal isn't normalized - normalize it (with mp3trim).
if it's already normalized (most probably), amplifying more the signal will distort it, in that case i would at least suggest to use a dynamic range compressor (has more reasonable distortion).

please remember that the (analog) signal maximum amplitude is defined by the soundcard and can't be changed with software tricks.

rui
14th May 2002, 22:08
DSpguru, thank you for the input.
I believe the mp3 sound is normalized. Since i'm not a sound expert, i followed the advice from those who are (Doom9's guides;), and i believe that normalization is one of the indicated setup parameters.

The dynamic range processor. I thought that i had done this when encoding the mp3. Isn't azid used to do this? Please forgive my ignorance.

Currently i am messing around with an option bsplayer has: loading of winamp plug-ins. In the winamp.com site i found some DSP plug-ins that can be loaded in bsplayer. I will mess with this and see.

Thanks again for your help :)