guys i asked a question about the phase controll and tips on were would you guys recommend having the volume gauge set half way (12o'clock , or 1 o'clock )
what setting do i set the phase control?,i dont kow what to do with this,
low level frequency i have set to 120hz, high level i have set to low (as i have the sub connected as lfe no high level connection)
the volume gain what would you say is the best/ideal position ? half wa i.e 12 o'clock or 1 o'clock
OK - first off I don't profess to be a Sub expert so take this as it is...
The phase control moves the waveform back-and-forth along the time axis.
Since the Sub is typically located away from the rest of the front speakers. As well as the fact that the sound takes time to travel to your listening position - the time it takes for the sound to travel from your front speakers or Sub will be different. You want the "push" of air to arrive at your listening position (your ears) at the same time from both your front speakers and your Sub. If the "push" of air doesn't arrive at the same time then to different degrees they will interfere with each other and in the worst case cancel each-over out.
So as you are the only person who has your front speakers and your Sub in your room etc... other peoples setting will not work for you except by shear fluke.
So - if in doubt leave it at 0 (no movement along the time axis).
However, that will not necessarily give you the best outcome.
If you own an AVR or Amp that has room correction then typically the AVR/Amp will calculate the phase required to compensate for Sub placement and distance from listening position. So leave the Sub phase dial on 0 and use the AVR/Amp to compensate.
If you own an AVR/Amp that has a setting where you can change the Sub phase then leave the dial on the Sub at 0 and use the settings on the AVR/Amp to compensate. However, the question becomes how to know which setting for phase to set on the AVR/Amp.
There are quite a few ways - some more accurate than others and some more complex than others.
On the complex but accurate side is using the free REW software and analyzing spectrum plots. (This I'll leave for others to explain better than me).
On the simple but maybe not so accurate side is using your own ears. One way of doing this is just by listening to some music with a repetitive deep base and starting from 0 phase on the AVR/Amp moving the phase value slowly until you either like/dislike what you hear. You want kick-drums and other such sounds to be tight, succinct and not mushy.
Now regarding the volume. This is personal preference. If you have an AVR/Amp that can room correct then leave the volume at 12 O'clock and let the AVR/Amp compensate the volume at the Sub so that sound levels are similar at your listening position from both your front speakers and your Sub. So if you have an AVR/Amp with such abilities leave the volume at 12 O'clock and let the AVR/Amp compensate.
Otherwise - you can either scientifically balance all your speakers with a Decibel sound meter (there's a few threads that explain this in more detail).
Or just use your ears. So start at 12 O'clock and move the dial either way until your happy that the bass is loud enough for your liking.
All the above of course assumes that you are using the low-voltage input of the BK XXLS-400.
regarding granite slate, im not sure, ive got concrete flooring and its laminated, and got those super spikes on.
With the super rubber spikes I wouldn't worry about it. The spikes will isolate better than a granite plinth. Don't put too much weight on top of the Sub as that will compress the super rubber spikes too much and with decrease the amount of isolation.