I was looking through the manual for my MR624 for fun, as you do, and noticed that the crossover point is 3khz. The interesting discovery was that the 5.25" model has a crossover at 2khz and the 8" is 1.9khz. does anyone know why the 6.5" has the highest crossover point? I looked up the manual for the jbl 306p, and it’s sister models, and the 6.5" model also has the highest crossover point, though not as dramatic a difference.
Why is the progression not linear? Why does this appear to be a semi consistent phenomena, and what kind of difference in sound could this cause?
Manuals can have typo’s also. Would not the first and probably not the last time.
I think the tweeters are pretty much the same in mentioned models (did not double check).
So it might have something to do with how the mid-range drivers works on those models and cabinets. Not sure does growing distance difference between tw - md + waveguide also need different crossover points?
There was some differences about the 2 - 4khz -range and how it effects, driver can being more more off-axis and less beaming effect. Can be completely wrong also. lol
Since those are all in the range of 1khz.
To the average listener.
You probably won’t notice any difference in sound if speakers where on exact same position and pointed/aimed exact the same, in the high crossover section. Would sound the same with music.
Pin pointed test only with 2-3khz range might give some small/minor differences between them. Then again, nothing major with music.
In car audio there is sweet point where different tweeters - midranges, crossover sounds “the best” for the listener. Usually changing between the ~2-3khz range. Distances between drivers being much bigger, tw models, amps, installation, aiming, tuning and of course the listeners preferences can change it. Talking about fully active systems and dsp tuning possibility.
1 Like
Frequency response heavily depends on the enclosure.
Depending on that, the crossover point moves about a lot.
Also: The bigger the speaker membrame, the heavier it is. Heavy things need a lot of power to change direction often (which is what high frequency is). So it just makes sense to keep higher frequencies away from big membranes.
1 Like
A lot of crossover design is subjective, and it’s going to depend on the frequency response of different models of drivers, regardless of size. In some cases, both drivers may have significant overlap in terms of the frequencies they can cover, but one of the two will sound better in that particular range. Some crossover points also get chosen because of how the individual drivers generate and deal with heat at certain frequencies and power levels. Further, the crossover point isn’t the whole story. You want to know what the order of the crossover is - how steep the slope of the filter is. It could be that you have a 4th order crossover at 3k in this model, and a 2nd order crossover at 2k in another model, so that 2k model might still wind up having the midbass driver contribute more total information above the crossover point than the one that’s crossed over at 3k. Finally, remember that 3k is less than an octave above 2k - from B to F#. You’re talking about 5 major scale notes difference in the crossover point. It’s not as significant a difference as it appears on paper.
1 Like