Originally Posted by slalanc01
My sub is good performer (200 Watts RMS, 750 Watts Peaks). My only concern about putting crossover to 100hz will be about 'THX recommandation' that crossover must be set at 80hz.
Also I have strong performer in my front line (2 monster floorstanding speaker, 12 inchs woofer, can goes down to 30hz). I also red some problems with crossover setting at 100hz where Sub became harder to integrate correctly with whole system?
Another question: What about rear surround? (7.1 setup) I have 2 older speakers in my back wall (6th and 7th channel) and I think they don't goes below 100hz!!! Do you know if 1015 send lots of LFE stuff to rear surround?
The Pioneer doesn't ever SEND signals from the LFE channel to any other channel....it's the other way around: when you select SMALL for a particular speaker, the low frequencies for that channel (e.g. LS & RS) are redirected TO the sub-woofer.
Whatever low frequencies signals sent to a particular channel originate in the source material....which presumably contains only sound reflections in the surround channels. However, don't believe anyone who tells you that the surround channels don't contain low freq info....that's a myth held over from the early matrix surround systems.
If you place a microphone at a distance from the stage, you are going to pick up very strong low frequency signals---especially since they are not attenuated very much in a closed auditorium....
In order to grab your attention in the theater, movie soundtracks are also frequently issued with strong low frequency signals in the surround channels.....
So feel free to override the AUTO MCACC speaker determinations and set marginal speakers to SMALL vs LARGE--after all, MCACC isn't testing them to see if they will accurately reproduce an explosive crescendo.
AHHH, multiple speaker integration. The choice of cross-over frequency is just one more variable, along with the number of sub-woofers, number of LARGE enabled speakers and above all--location, location, location.
For example, if you have a big room response hump at say 100 Hz, an 80-Hz LFE cross-over could result in less contribution from the SMALL speakers than when set for 100-Hz....which may or may not be a good thing....
However, I doubt that you will be able to hear much of a difference as you switch it back and forth...
The REAL purpose of a variable bass redirection crossover (which after all only affects SMALL speakers), is to be able to increase it for really small speakers (in order to reduce distortion) and lower it back to 80 Hz for moderate sized speakers.
Commonly used rule of thumb: if the speaker is 6-inch (I would say 8-inch) or above, set it to LARGE, else set to SMALL.
My proposed rule of thumb: determine the driver size for the SMALLEST speaker that is set to SMALL:
a) If it is 6-inch or larger, use 80 Hz crossover [Maybe dual 6-inch and 8-inch or larger???],
b) If it is one of those really tiny speakers, use 150 Hz, or maybe even 200 Hz....
c) For speaker sizes in between, use 100 Hz.....