Left /right Channel balance

Not a specific Logic question as such, more a general one on sound balance. Have been using a pair of Klipsch speakers for about a year now and have started noticing a decided swing of volume to the left hand channel when everything is set to centre like drums etc. Tried swinging a drum snare to the left and right and the right hand channel is just so much quieter to the point of al most losing the snare ! Tried it on my headphones and its the same. Could my mac be giving a hiccup?
M

Hi,
You might do well in calibrating your audio outputs.
Here's a quickie:
1. Turn OFF your speaker system. Failure to do so will not only blow them up, it might get you evicted...or thrown out from your parent's...or the neighbor going after you with a shotgun, you get the picture. I won't be held responsible if you skip this step, and become deaf as a result.
2. Open a blank Logic song, and make 1 track. Insert a tone generator plug-in,and set it to 0dB (the maximum output level). Make sure the pan is set to centered.
3. check your audio device's output level meters. they should MATCH. If not, there is an issue with your audio device. consult the mfr to get this fixed ASAP. If this step is ok, move on to no.4.
4. If you have a mixer after your audio device, look at the INPUT GAIN on the channels that your main outputs from your audio device are fed into. Put the left channel into SOLO, and calibrate the input gain so it clips, and tehn back it off just slightly, until no clipping occurs. Do the same for the right channel.
5. Set the OUTPUT of the mixer faders to 0, and pan each channel hard left and hard right, respectively (ch1 left, ch2 right, etc.)
6. Look at the mixer's OUTPUT meters. Do they match? If they do NOT match, you need to contact the mfr of the mixer, and have this fixed ASAP/ If they DO match, then proceed to step 7.
7. Look at the amplifier that your speakers are hooked up to : does it have an INPUT gain knob? If it does, then you can calibrate your speaker amplifier. If it does not, REPLACE this speaker amp with one that DOES have input gain knobs. If it does have input knobs, you now can calibrate the speaker levels. Go to step 8.
8. With a good SPL (Sound Pressure Level) meter, place the meter on a mic stand or other sturdy device, and place it in your mix position, pointing towards the exact middle of your speaker spread (exactly between the speakers). Turn the meter on, and set it to read 80dB sensitivity.
9. Set your mixer's monitoring output (the one that turns the output up and down to your speakers) SLOWLY... until you get 80 dB on your meter.
10. MUTE the right speaker output. You can do this on your mixer, by muting the left channel. then turn up the monitoring level up until you get the same 80dB. What is the level difference? Note this.
11. MUTE the left channel, and turn on the right channel. turn up / down the monitorin levle until you reach 80dB. What is the difference? not this too.
12. On the speaker gain knobs, notice where they are BEFORE you calibrate the speaker amplifiers.
13. Put your monitor level back to about 10 am position. This one is the one on the mixer. NOt the one on the speaker amp!!!
14. While still on the RIGHT channel only playback, notice where the level meter is now. Adjust the RIGHT speaker input so that it reads 80dB upon playback at the 10am position on the mixer monitoring knob.
15. MUTE the Right playback, and turn on the Left channel playback. notice where the level meter is, and adjust the LEFT speaker input until you get the 80dB.
16. Now, turn on BOTH Left and Right channels, and it should be louder than each channel separate.
17. Adjust the monitor level knob on your mixer until you reach 80dB. MARK THIS SPOT.
You now have a calibrated listening system.
Enjoy

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