![]() ![]() ![]() The SHL5+ linked above shows a massive dispersion mismatch. Downplaying or wilful ignorance of off-axis behaviour. There are a few broad claims to justify Harbeth-style designs by its apologists:ġ. Let's not conflate that with actual performance, where disproved by empirical evidence. Alan Shaw, like Rob Watts of Chord, is a technically-competent engineer using his skill not to push the frontier, but to defend the hill they choose to die on: handicapping themselves with rationally-indefensible design choices and then being economical with the truth. Last I checked, cars are not free to run so please donate what you can using: are welcome.ĭrive nearly 200 miles today to drop off and pick up some gear to test from local members. Needless to say, I can not recommend the ATC SCM19 (version 1).Īs always, questions, comments, recommendations, etc. That seems like the wrong problem to try to solve. I read that the new version uses in-house tweeter. But then the listening tests confirmed the same. The results are so poor that I am suspecting my measurements must be wrong. I can't fathom how they would produce something like the SCM19. My impression of any such company is that they would produce speakers that would have a neutral and balanced frequency response and hence tonality. But hey, if am going to play speaker designer with equalization, why did I pay the factory $4,000?ĪTC is another "PRO" company producing hi-fi speaker. This has minimal impact on amount of bass but nicely eliminated the woofer from bottoming out (and getting seriously distorted). Suspecting that the problem was deep bass, I dialed in Band 3 which cuts out the lowest bass registers. Was happy for 10 seconds until I turned up the volume and the woofer bottomed out! I thought for sure it could handle that 2 dB peak. First thing I did was put in a low shelf to boost the bass: So I pull up the EQ in my Roon player and put on my surgical outfit to fix what shouldn't need fixing. I turned up the volume but now the mids and highs were getting quite loud and annoying.Īt this point I stop and get the measurements and see the lack of bass. What? Where is the bass? What is that woofer doing? It sure is not moving much. I thought, "oh yeh, this is going to be good!" Then the vocals came. They sounded like they were jumping out of the speaker and reaching toward me. The "5 second" impression was an incredible presentation of high frequency notes. So this time as the system was crunching the equations I did precisely that, fully biased on the incredible heft of the speaker and beefy speakers expecting to be blown away by the dynamics. ![]() You all keep asking me to listen to the speaker before measuring. This so called spinorama shows us just about everything we need to know about the speaker with respect to tonality and some flaws: This made a tiny difference (likely due to size of the speaker and my measurement distance).Īcoustic measurements can be grouped in a way that can be perceptually analyzed to determine how good a speaker can be used. The manual for SCM19 states that the acoustic center is between the tweeter and woofer rings so I compensated for that by lowering the measurement center to be 4 centimetres lower. I usually use the tweeter center as the measurement axis. I used over 800 measurement point which was sufficient to compute the sound field of the speaker. 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). Designed and manufactured in Gloucestershire, England. ![]()
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