- Written by Ross Jones
- Published on 26 February 2013
The Crystal Acoustics TX-T2 SE THX ULTRA2 Certified Speakers On The Bench
As usual, all measurements were taken with the speaker in the middle of the room, to avoid interaction with corners and walls. Except as noted below, measurements were taken at one foot at a height equal to the driver being tested.
Distortion at 1 kHz is 2.13%, with even-order harmonics predominate.
At 10kHz, distortion is down to 0.6%.
The T2 is rated by the manufacturer as capable of useable output down to 35 Hz. As shown, the Crystal can indeed put out significant power at 35Hz, while remaining under 9% THD+N. Quite impressive for a modest-sized floorstander.
I was curious to see what the distortion characteristics would be at a slightly higher frequency, 50 Hz. THD+N is all the way down to 0.48% at 100 decibels. I've tested dedicated subwoofers that didn't measure this good at 50 Hz.
In-room response is show at one foot, one meter, and two meters. Because these measurements were taken with the microphone positioned between the two woofers, the high frequency response becomes more susceptible to room reflections at longer distances.
The T2 is rated at 8 ohms, with a minimum impedance of 3.2 ohms. The pink impedance trace shows a minimum of 3.8 ohms. Phase above the characteristic double-hump of the speaker port shifts a maximum of 70 percent. The impedance-phase angle around 1.4 kHz probably explains the higher distortion reading at 1 kHz.