Home Speaker Asylum

General speaker questions for audio and home theater.

RE: Zu Soul Supreme sensitivity

Corner placement might not have that large of an effect.

Per the standard, sensitivity should be measured under free-field conditions using pink noise, with the result weighted. The standard specifies that broadband sensitivity should be measured with a test signal having a two-octave bandwidth centered on 1 KHz (500-2000 Hz). Or, if a different bandwidth is used, it should be stated with the measurement. Toole recommends using a 300-3000 Hz test signal because it contains all the frequencies that contribute to the perception of loudness.

Boundary reinforcement boosts loudspeaker output only in the frequency range where the radiation pattern is omnidirectional. For a wide baffle box speaker like the AN-E, that's only in the bass <200Hz. Therefore, it won't have much impact on a sensitivity measurement made with either the ISO standard's proposed test signal or Toole's proposed test signal.

Obviously, if you used a white noise signal with no weighting, the boost below 200 Hz from corner loading would help raise the result, but then you have a useless number that can't be compared to anything else.

Audio Note is not the only manufacturer to advertise sensitivity or efficiency numbers that are optimistic. It's almost he norm among manufacturers of high efficiency speakers that use dynamic drivers in a box.

Take the Tekton Lore for example. It has an Audax TW025A28 tweeter whose sensitivity is specified by the manufacturer to be 94 dB, and a Eminence Legend B102 woofer whose sensitivity is 92.4 dB. Before you even consider crossover losses, it's obvious that the loudspeaker isn't going to come close to the 98 dB claimed by the manufacturer.


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