Originally Posted by Webmonkey
Thanks for replying.
Well, my fronts are very large, so there is no way I will put them into small mode :-)
I just discovered that there actually IS a "Extra Bass" mode on this Yamaha processor - but it does not seem like something that can be only-on for stereo, mono, pro logic sources. And it does not look like there is an option for selecting the cut-off frequency :-(
I hope that it also works without DSP modes.
First, let's clear up a misconception. Regardless of the quality and range of your main speakers, setting them to "Small" in the AVR bass management does not mean they're "underpowered." Large vs Small is one of the most misleading things in AVR settings.
All it does is divert ULF bass content from the main speakers to a subwoofer. YOu can generally set the low-pass cross over frequency to as low as you like: 40 Hz, 60 Hz, the THX std 80 Hz. If you have mains with woofers less than say 7" then this can be advantageous as your sub makes the ULF bass, and the mains no longer try to. It conserves power since the lower the freq, the more power the AVR consumes driving speakers (presuming your sub is self-powered).
There are some theories that this makes your main speakers more efficient, because they are no longer tasked with producing the most power consuming low freqs
I think it just makes sense. Your main speakers can be used for higher freqs (above 80 Hz, or above 120 Hz in my case), freqs they are better at producing.
The Extra Bass function that sends certain low freqs to the Sub, AND the main speakers, will usually sound like dookie. You have a powerful sub generating ULFs, and the mains are also trying to reproduce them. It can be an uncontrolled mess. UNLESS you really love boomy, distorting, messy bass, that is.