I have never seen anyone actually say whether or not they are calibrating their subs with all other speakers turned off. I saw one poster that had stated that the Conquest liked a lower X over frequency. I got to thinking about re testing my M&K and DIY titanic Mklll 12. I have them crossed over at 80 now and never thought about trying it lower. I am not sure if I would see much flattening in the response or not.

Any thoughts

i calibrated my setup and admit i could not tell the difference until my roommate inadvertently reset the default in an attempt to play assassins creed not knowing how to us my harmony 880. i asked him if he touched anything and he didn't admit to it until i said it sounded funny.

i run all of my speakers full range (large) and my sub is crossed at 40hz i used NCH tone generator and a rat shake spl meter to plot the response. i found that my speakers all dropped of heavily at about 44hz. they all were within 2db at 46hz calibrated at 75db. in my system this gets rid of nasty spikes but there are still a few nulls because of the placment in my room. to me the nulls are far less distracting then the spikes.

my receiver is around 90db at -10 volume and this is where i listen to movies by myself, 0 when friends are over... very loud in my 10x14x8 room.

I have never seen anyone actually say whether or not they are calibrating their subs with all other speakers turned off. I saw one poster that had stated that the Conquest liked a lower X over frequency. I got to thinking about re testing my M&K and DIY titanic Mklll 12. I have them crossed over at 80 now and never thought about trying it lower. I am not sure if I would see much flattening in the response or not.

Any thoughts
I don't understand your question. You can't "calibrate" your sub with the other speakers turned off. Calibration is defined as setting the relative levels of all the speakers and the subwoofer to be the same. This ensures that all the speakers are playing back at the same relative level.

Setting the crossover frequency is another matter entirely. If you want to set the crossover lower, you can do that. Just be sure to re-calibrate the system afterwards.

The more important issue is how your receiver/pre/pro handles the LFE channel. If it is like most processors, it will sum all the bass in the channels set to "Small" with the LFE and THEN apply the crossover. What this means is that you will be discarding the bass in the LFE channel above the crossover frequency. IOW, the lower you set the crossover frequency, the more LFE channel you'll be discarding. It is probably redundantly recorded in the mains, so they will be reproducing it, but that depend mostly on the LF capability of your mains.

You can't hurt anything by trying it, so have at it. Let us know how it works out.

Craig

Sorry about that Craig John, I calibrate the sub with my rat shack meter and when I test the sub (sweeps etc.) that is where the question comes in. It kinda makes sense to me to have the mains on since they will blending with the sub. I quess it doesn't sound logical to me to have a sub test one way only to add in the mains and hear holes in the frequency sweep. To be honest with you, I called AV123 and got 3 different answers from 3 different people.

Sorry to be such a noob. I'm an audiophile in training.

as craig john explained, you need to blend the levels with the system setup as you would listen. you wont watch movies with the mains of...

pick a crossover point you like and set the speaker and sub volumes to match accordingly with your meter.

if there was any change when the mains where added in then you have a phase issue not a levels issue. in this instance you need to play with the phase until you get th flattest response. if you do not have a phase dial then try both 0 and 180 keeping the setting that is less detracting.

in my system i have a slight dip in the mid 40's because my speakers don't quite reach to 40hz bu ti also have a dip at 70ish because of phase. i cannot see the phase dial but i slowly moved it until i saw the least needle movement.

any other fine tuning will need EQing and i don't have the stuff to accomplish this.