Originally Posted by Mandrake2003
I have just received my ULS-15 and am going through the procedure of setting it up. I have a few questions...
How do I set the ULF trim? I don't understand what it actually does.
I have set the ULS volume to about 10 o'clock and manually set the sub-output level from my receiver (Pioneer VSX-1120K) to +4dB. Still I need to have the receiver's master volume quite loud for the sub to come on from standby mode. Am I doing something wrong?
I am using a Galaxy Audio CM-140 Check Mate SPL Meter
and it has a 'C' mode for low frequencies. Should I use 'C' mode for measuring the sub-woofer? Or just stick to 'A' mode?
Congrats for getting a ULS!
Did you set all the main speakers to small, 80 Hz crossover? Large speaker settings, or low crossover points reduces the amount of bass going to the sub. Also, feel free to leave the sub in the 'on' position instead of 'auto' position. The sub will draw the same power in either mode.
You definitely have to use the 'C' mode. A mode will not measure any bass frequencies.
Do post your room layout. Include all dimensions, distance of your ears from nearest walls when seated in your best LP, which spots in the room you can put the sub, and details of adjoining rooms that you can acoustically couple your main room to by keeping doors open, etc. Best deep bass performance may be when you leave those doors open!
Since you have a means of measuring, place the sub in your best LP, woofer at ear level. Play the test tones and put your SPL meter at the different locations where you can place the subwoofer. With the same test tone level, plot out the absolute SPL reading at all the possible locations for the subwoofer. Do a set of curves for doors closed, and doors open. If there are more than one door, you should do it for door 1 open + door 2 closed, door 1 closed + door 2 open, etc. Post all the graphs and I will help you pick the 'best' location for the sub, and which door(s) to keep open when listening.