Home Speaker Asylum

General speaker questions for audio and home theater.

Re: Now I have entered into the active x-over "world"

As my first suggestion, I would reccommend spending $60 and getting the Infinity R.A.B.O.S. kit (no it's not an organization bent on world domination from a James Bond movie) It comprises a sound level meter, a test CD (20 to 100 Hz), good instructions, and some graph sheets. It works very well. I used it to set up my system(also an 80 Hz x-over) and loaned it to a friend who was having fits trying to set his system up. Helped us both a lot. You will need a good tripod to mount the meter to. I've made a lot of acoustical measurements over the years and I was surprised by the repeatability of this system. The meter is specialized and is not a general purpose sound level meter, but it does the job for bass range set ups.

If you don't want to do that, then I would suggest finding some CDs where is a bassist playing progressions up and down the range of the instrument, and listen for holes and peaks. The problem with this is that your hearing memeory is poor, you have no idea if the recording is anywhere near linear, and your hearing sensitivity in the low bass is very dependent on the level you're playing at. The Fletcher-Munson Effect. This is my ninth biamped system (with active crossover) and I've used instruments on all nine. I have tried doing it by ear, but with mediocre results) I used to borrow them from the labs at work, but now I'm retired I no longer have that luxury. The RABOS kit worked as well as anything I could have borrowed anyway.


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