![]() Listening some more, the sound could be better as it was a bit bright and unexciting for lack of a better term. ![]() "5-second" reaction to speaker first playing was neutral. Once again we see a sign of our 700 Hz resonance in the form of a "kink" in the phase response (red). Impedance at 5 ohm is above average (a good thing). Here is our waterfall telling us what we already know with respect to 700 Hz resonance: Vertical directivity is typical of 2-way speakers but while some speakers really fall apart off tweeter axis, here you have about +-20 degrees before response gets worse: We see the same with fancy color graded chart: I like the overall well behaved response although it is not super wide. We have some distortion here so not matching our ideals. In absolute levels we get this:Īs noted, in this plot I like to see nothing but blank space above 500 Hz. At 96 dB we have the woofer getting unhappy around 400 Hz and tweeter screaming as well but that distortion is at pretty high frequencies. We see our dip in energy around 1 to 2 kHz again and then some increased amount after that.ĭistortion response at two different output levels is shown here: Putting everything together, we can plot a hypothetical frequency response in a simulated room: Worst offenders are floor and ceiling reflections so at least a carpet is advised. We see a dip in energy around 2 kHz due to directivity error mentioned before. ![]() The port (red) helps fill in the low-bass response.īack to our "spinorama" here is how the important reflections look in a room: There is a bump in tweeter response which seems intentional to give the speaker a bit more "zing." We can also detect the crossover frequency at near 2 kHz. We see our 700 Hz resonance there as a peak in the woofer response so we know it is coming from that. Going back to the resonance, I made near field measurements (almost at driver/port location) to see what they each are doing: The woofer is getting directional before the tweeter takes over with its much wider beam width. Overall, this is a rather flat response so response is not going to be too far from neutral.Ī sharp resonance sticks out prominently at 700 Hz which you will see later in a number of other measurements. ![]() This so called spinorama shows us just about everything we need to know about the speaker with respect to tonality and some flaws: I used over 800 measurement point which was sufficient to compute the sound field of the speaker.Īcoustic measurements can be grouped in a way that can be perceptually analyzed to determine how good a speaker can be used. In a nutshell, the measurements show the actual sound coming out of the speaker independent of the room. Both of these factors enable testing in ordinary rooms yet results that can be more accurate than an anechoic chamber. It also measures the speaker at close distance ("near-field") which sharply reduces the impact of room noise. This is a robotic measurement system that analyzes the speaker all around and is able (using advanced mathematics and dual scan) to subtract room reflections (so where I measure it doesn't matter). Measurements that you are about to see were performed using the Klippel Near-field Scanner (NFS). The binding posts as is typical are too close to each other and recessed in this case, making them pretty difficult to turn. The finish is fine except I saw a fine white line above the speaker: It is likely a nod to retailers putting these in showrooms trying to keep fingers away from the delicate tweeter. But I did leave the tweeter screen in place for testing. It comes with an external grill that I did not use. ![]() It costs US $245 from Amazon including free shipping. It was kindly purchased by a member new and sent to me for testing. This is a review and detailed measurements of the ELAC Debut 2.0 B6.2 bookshelf speaker. ![]()
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