Flat Anechoic Measured Frequency Response Speakers


No unverifiable claims please. No in-room response measurements please.

Please post link(s) to relevant measurements. They don't have to be perfect, but relatively flat would be best.

Thanks.
jkalman
Not necessarily flat, but smooth.

Agreed - exactly! Very few people are aware of this. When I talk about tone control adjustments audiophiles cringe ....but they should not. It is no crime to tweak in this way. In fact a ruler flat on axis response is NOT all that important to our listening pleasure...it is actually the off axis that matters most.....in fact the MOST important thing is that the on axis and off axis behave in at least a uniform way with consistent gentle roll off as you get to wider angles...this is what sounds natural!

What sounds unnatural to our ears is a speaker transducer that has either strong directivity or wobbles and bumps off axis such that the on axis and off axis curves do not all behave together in a smooth way - in many poor designs they often crisscross as the cone breaks up or there is a sharp discontinuity at the crossover region (suckout or sudden abrupt change in dispersion pattern)

See this discussion SM75-150S. You will see the author correctly emphasizes that it is NOT the smooth on axis frequency response that is so important in a driver but the smooth consistent behavior between on and off axis and a wide dispersion.

SMOOTH is the key ingredient. This is why many designers pay so much attention to smooth phase response which is a warning sign of unwanted things going on with the design.
Does anyone have any information and a link that quantifies "smooth?" I've been wondering exactly what the term means in respect to frequency response, not as much in phase response.

I'd also be interested in what Paul Barton meant by additional mid-bass and extra sizzle on top, if anyone has a link to numbers.

Thanks.
The deviation on top is a roll-off, not sizzle, I believe. The curve most people like bumps a bit in the mid bass and slopes off gradually in the treble.
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