RTi crossover question

comer

I was looking at the RT2000i crossover and found what to me is a very strange thing - the lower filter for mid-range woofer passband is set to 35hz :eek:

I thought I was delirious so I made a quick experiment - set speakers to LARGE in the receiver, turned off the sub in them (so the only passive portion works) and poped in the DVE bass management test. Lo and behold - although I can not quite hear anything below ~50hz from the mid-woofer I definitely can see/feel the cone vibrating. Even 50 is way too low for the driver's purpose IMHO.

Do you think the design is wrong or I am indeed delirious?

jcaut

First, 50Hz is not exactly "way too low". The lower the better, for sub-blending purposes.

Second, the folks who designed that speaker know WAY more about building speakers than I do. In what way do you feel that raising the high-pass on the midwoofer would be a benefit?

Jason

comer

Well, the main purpose of a x-overs in general is to limit the bandwidth going through by the driver to what it can reproduce the best. Feeding signal above or below that band leads to distortion. For relevant example - frequency too low for the driver will result in high excursion and clipping and/or limited ability to play other frequences at the same time (driver at its excursion limit can't excurse some more to reproduce another signal faithfully).

The upper limit of the subwoofer section of a RT2000i is 65hz and it's far below of what the 8" drivers can reproduce, thus there's no natural degradation of the responce there, no need for "support" from another driver. So the band 35-65 is being reproduced by two drivers - mid-woofer and sub-woofer which does not make much sense.