Amp gains work the same way – too low, and the background noise, or “hiss” takes over Too high, and music becomes distorted even at a normal volume level. I've discovered that setting the volume knob at 1/2 and calibrating the sub at -3dB on the receiver (75dB SPL) causes clipping on the output stage of the receiver at 0 dB on the receivers volume control ( reference volume for film). Small speakers: These are any speakers that do not play down to 20Hz. Large speakers: These are speakers which are truly full-range and play down to 20Hz. If you have a subwoofer in your home theatre, stereo or car, you know how tough it is to get the bass levels just right. Here’s a trick to setting it up in just a few seconds. If the post-set-up AVR subwoofer channel level is bottomed out at the minimum setting (usually -12), that means the subwoofer volume was set too high. LFE: This stands for Low Frequency Effect and is a the dedicated “.1” channel in a 5.1 or 7.1 surround mix. Reduce the subwoofer volume accordingly and re-run set-up. Just like the phone conversation, there’s a sweet spot where you can use a wide range of volume from your head unit without too much hiss or distortion. If however, (depending on the room and sub location of course) the receiver's LFE was ending up too high or too low on its scale/range of adjustment, I would compensate by adjusting the sub gain accordingly. That said, I would begin by setting the sub volume at the halfway point and using the receiver to start the adjustment. The desired AVR subwoofer channel level after running auto-set-up is in the -8 to -4 range (typically on a scale of -12 to +12).

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