Originally Posted by notig
Hey guys I am recently going to join you.. I ordered 2 Iq 9's for fronts, Iq6C for the center, and four IQ1's for surround... I was wondering what crossover settings are recommended?
I heard that you take the lowest frequency they can do and add 20 and set that as crossover?
so 38hz + 20 around 60 hz on the fronts?
the center is 65 hz so maybe 85 hz for center?
and 50 hz + 20 so maybe 70 hz for the IQ1's? Does this sound about right?
another thing.. when you use an SPL meter and calibrate.. I know this is a newb question but to get the speakers to the same SPL level is what you are adjusting to get them to this level the crossover frequencies or something else? the crossover is to tell what bass to send to the sub basically right?
Do you have the ability to set different crossover's for each speaker set (fronts/center/surrounds) or not? Even if so, I doubt you will have all those settings available. Usually the smallest increment is 10Hz, so I doubt you will have an 85Hz setting (maybe, though). Some receivers only have 20Hz increments; 40, 60, 80, 100, and 120Hz, for example.
Adding 20Hz is probably not a bad way to do it, but realize that the Hz scale is logarithmic, so 20Hz up from 38Hz is a much larger step than 20Hz up from 65Hz. Some people recommend using a crossover setting that is an octave up from the speaker's -3dB low-end capability. For your fronts, this would be 76Hz (38x2), and using an 80Hz setting for them would not at all be unreasonable (it is what I would use). You will not be "wasting" the speakers if you do that. But for the center it would be 130Hz (65x2) which IS too high. 80Hz would be OK for it. Maybe 100Hz, but I wouldn't go higher than that (see below). For the iQ1s, it would be 100Hz. They, too, would be fine with an 80Hz setting.
80Hz is, by far, the most commonly used crossover setting. Many people use it even if their speakers are capable of much lower output than that. Above 80Hz, bass frequencies begin to become more localizable to the subwoofer. Generally (but not always), with a capable subwoofer (a speaker that is specifically designed for reproducing bass), you want to send as much bass to it as possible. So, provided it is OK with the speakers being utilized, 80Hz is a good cut-off. But you will also want to experiment a bit. It may be that your front speakers reproduce the 60Hz to 80Hz bass better in your room than the sub. Just make certain to recalibrate everything when you change settings (see below).
It has been argued that using one single crossover value for all the speakers may be better than using different values for each speaker set (and vice versa). Personally, I would just use a global 80Hz setting for all those speakers.
And, yes, the crossover setting determines which frequencies from any speaker channels set to SMALL are rerouted to the subwoofer.
What receiver will you be using? Does it have Audyssey or some similar auto-CAL/auto-EQ capability? If so, you may want to use that, at least initially to see what crossover values it assigns to the speakers.
If no Audyssey (or similar), you will set the crossover values in the receiver manually and calibrate the speakers' levels with the SPL meter. The SPL meter measures the s
evel. Basically, it is how loud the speakers are. The goal is to adjust them so that each speaker contributes equally to the overall output as measured at your "sweet spot". The crossover setting CAN indirectly affect a speaker or sub's output when it is sent a test tone, but you will have already decided on and set the crossover settings so it is irrelevant when calibrating the speakers' levels.