Originally Posted by david0406
Thanks guys! Great info as always. I will continue to experiment. SO you are saying my subs xover should be set the same as my mains crossover to avoid overlap of frequencies? Is that what I am understanding? Bring the mains up to 60hz and the sub down to 60hz or 80 and 80?
Yes that is exactly what im saying! give it a shot, see what type of sound you get out of each. I ran a freq response once in my old truck and learned that a small gap between the sub and the mids actually yielded the best results ( IIRC i ran the sub to 60 and mids picked up at 80, otherwise I had a huge peak in the response) This isnt as common in home settings, but it could still happen.
Originally Posted by jackbuzz
LPF for LFE and Xover for speakers to sub are two different things. Some AVRs allow setting the LPF for LFE others don't.
Until OP clarifies settings this "argument" is going nowhere.
Not really actually. I know they are under two different menus on your AVR, but what do you think the xover is for your mains? Well I'll tell you, it is a HIGH PASS FILTER. what does this mean? it means the AVR will send the full bandwidth signal to your mains ABOVE where the xover (or high pass filter) is set. so just for an example, you set your mains at a 40hz xover. Below this point, the avr will begin to attenuate the speakers response, probably at around a 12db/octave slope. Why? to protect your speakers from playing frequencies they arent meant to play. Next question, what does this crossover do to your sub? absolutely NOTHING, this setting is purely for where you want your main speakers response to start sloping off to your sub's response.
So where is your sub's response set to play to now? 120hz, that means from 40hz to 120hz, your mains AND your sub is playing the same content. What does this do? usually creates a peak in the midbass response, sometimes muddies the clarity of quick bass hits or kickdrum beats, and overall is something you DONT want to do (unless you decide you prefer the hightened midbass response, to each his own)
So why do you set the LPF for the sub at the same spot as the xover of the mains? to prevent them from playing the same material, and almost always yield a smoother response overall.
Originally Posted by jackbuzz
Xover on sub itself should be bypassed or turned all the way up , let AVR control Xover.
that is not true, unless you are talking about bypassing it outside the AVR or at an external xover or something of that nature otherwise you couldnt be more wrong. Yes, the avr does need to control the sub's xover, but choosing the 40 or 60 or 80hz xover for your mains, does absolutely nothing to the sub. that is why they let you select the LPF of the LFE seperate, so you may adjust accordingly. My mains play to 80hz while my surrounds can only get down to about 80 or 100, so should i choose an 80 or 100hz LPF for the SUB? its up to me, but that is why AVR's give you the choice. when I have a full 7 channels that can play down to 40hz, then maybe ill only let the sub handle 40hz and down! thats the whole point of tweaking and seeing what sounds best