Center Channel Speakers
- Written by John E. Johnson, Jr.
- Published on 03 March 2008
On the Bench
For THD+N, the bandwidth was 80 kHz.
At 1 kHz, distortion was 0.37%.
At 10 kHz, measuring from the tweeter, distortion was just over 1%. This is higher than when measuring it during the THD+N vs. Frequency test, and I suspect the tweeter heated up a bit when a constant sine wave was applied.
THD+N vs. Frequency across the entire audible range indicates that, like other speakers we have tested, there is quite a bit more distortion at the lower frequencies. At 50 Hz, it is about 2% and this is a good place to cross the VisiUN over to the subwoofer.
Room response shows that the VisiUN is reasonably flat down to about 50 Hz, then drops off sharply. At a 450 angle off axis, the response is about the same up to 8 kHz or so, and this is the majority of what we hear (I find that music is mostly in the 60 Hz to 6 kHz range). So, this is why the VisiUN sounds so good off axis.
The Impedance-Phase curves are shown below. The impedance appears to be nominally 6 ohms, and the electrical phase stays within ± 300. The speaker would be reasonably easy to drive, but I would suggest using a top of the line receiver at the least.
Von Schweikert makes some wonderful speakers. The VisiUN completes their product line as a center channel. It has spectacular sound, and you can experience it no matter where you sit in the room. This is about as good as center channel sound can get.
P.S. I damaged the VisiUN before I could perform the bench tests (burned a resistor in the crossover network), so the review unit is under repair at the factory, and at some point, I will get the speaker back to complete the tests. They will be added to the review at that time.