I became aware of some testing Zaph did regarding the RSS315HF and RS270. I was surprised to say the least, the distortion looked pretty bad. The RSS315HFs 3rd harmonic levels reach .3% at 200hz (wasn't measured beyond this) and the RS270 maintained .3% 3rd harmonic levels from 200-500hz and ~.4% 2nd harmonic levels from 350hz-->500hz. It doesn't look like they (although possessing a much greater amount of displacement) can swing with the the midranges Zaph measured. Although appearing bad, I'm not sure what to make of it since Zaph, other than leaving us some context clues, doesnt appear to list the SPL he measured them at. Are they measured at the 96dB @ 1/2m that the 6.5s were measured at or something else?
Zaph mentions that the RS270 was reaching ~2/3 xmax around 100hz, so I plugged the figures into spl_max1 (330cm^2, 4.4mm xmax, 100hz) and got 106dB. If we account for baffle step, thats roughly 100dB. Is this about right?
I'm not sure if Zaph likes people borrowing the pictures from his blog (so to be courteous I saved them on my computer and hosted them myself).
RSS315HF
RS270
(FYI I plan to use these drivers in a dipole alignment)
I have been under the impression that a high displacement midbass/lower midrange driver crossing to a midrange around 300hz was the way to go...have I been misled or interpreting information incorrectly? Would a multitude of RS225s (say 4/panel) crossed around 100hz to a deep h-frame/w-frame be a better option than taking the subwoofers (specifically RSS390HF) up to the midrange crossover point on a flat baffle? The RS270 doesnt seem to measure all that impressively either, is it truly one of the best midbass drivers when crossed ~500hz, or is it bested by its smaller brothers the RS225/RS180 when used in pairs costing the same $$$?
Zaph mentions that the RS270 was reaching ~2/3 xmax around 100hz, so I plugged the figures into spl_max1 (330cm^2, 4.4mm xmax, 100hz) and got 106dB. If we account for baffle step, thats roughly 100dB. Is this about right?
I'm not sure if Zaph likes people borrowing the pictures from his blog (so to be courteous I saved them on my computer and hosted them myself).
RSS315HF
RS270
(FYI I plan to use these drivers in a dipole alignment)
I have been under the impression that a high displacement midbass/lower midrange driver crossing to a midrange around 300hz was the way to go...have I been misled or interpreting information incorrectly? Would a multitude of RS225s (say 4/panel) crossed around 100hz to a deep h-frame/w-frame be a better option than taking the subwoofers (specifically RSS390HF) up to the midrange crossover point on a flat baffle? The RS270 doesnt seem to measure all that impressively either, is it truly one of the best midbass drivers when crossed ~500hz, or is it bested by its smaller brothers the RS225/RS180 when used in pairs costing the same $$$?
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