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RE: What do you think?

Posted by tomservo (M) on February 11, 2016 at 06:48:12

In Reply to: RE: What do you think? posted by hennfarm on February 10, 2016 at 22:51:41:

Well that's a real loudspeaker!
You have two measurements of the speaker, the top is magnitude (and possibly phase), the other is the impulse response which is the "time view" of the resistive portion of (energy time curve or envelope time curve) of magnitude and phase. The impulse and magnitude and phase are two different views of the exact same things, with one, you can calculate the other.
Observations;
The flat looking response below about 50Hz is probably not real, the response would normally continue to fall off below the lf corner at about -12dB / oct for a sealed and -24dB/oct for a vented box.
The appearance of "free bass" in impulse based measurement systems can be from not using a long enough impulse, not averaging several impulses and or reaching the system noise floor (for example see if that changes when you increase the mic gain). The lf corner appears to be around 70Hz (this is a smallish speaker?) and the in band response appears to wiggle about + - 6 or 7dB or maybe a bit with whatever smoothing was applied. For marketing loudspeakers + - 3dB is what people are conditioned to expect and this would probably "fit" if it were smoothed "enough". Recall that while we can hear a 3dB change in level, generally it is a +10dB change (10 times more power) that is subjectively "twice as loud".
Without phase being visible and time of flight removed, I can't tell where crossovers are or if it's a single full range driver.

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