tSc TST2 Setup and Measurement

I set up the TST2's on either side of the Diamond Case Theater Tech TT-400 Credenza with the side firing woofers pointed out. The speakers were powered by my Denon AVR-2307CI with SeymourAV 500 watt ICE Block 5001 monoblocks. A Denon DVD-3910 universal player did source duties with cabling from Impact Acoustics and Blue Jeans wiring everything together. While I never did get the speakers to sit as solidly as I'd have liked, they didn't seem like they'd tip over without major effort from one of my kids. The TST2's were one of the few speakers that I felt really sounded better with minimal toe-in. While they didn't sound bad pointed directly at me, I felt the soundstage gained huge benefits in width with a more straightforward orientation. The off axis response of the TST2's seemed to be good enough that having them toed in only slightly gave me all the performance of a more direct orientation with the addition of soundstage width.

One thing I'm going to remind you is to check the five way binding posts on the back of the speaker. While there is an included jumper bar, a few of the terminals were loose and needed to be tightened. This, if uncorrected, could have caused vibration and extraneous noise. More than one Audioholic has spent countless hours trying to track down a buzz just to find out it was a loose binding post. Don't become a statistic.

Measurements & Testing

For laboratory measurements I used the Sencore SP395A FFT Audio Analyzer and a Sherbourn 2/75B amp, I measured the TST2's in-room on- and off-axis frequency response with 1/12th octave resolution

TST2 1 Meter Frequency Response (1/12th Octave) On Axis
Note - this is NOT a 1 watt measurement

TST2 1/2 Meter Frequency Response (1/12th Octave)
Pink - On axis, Orange - 15 degrees off axis, Yellow - 30 degrees off axis

Overall the frequency response of the TST2's was extremely linear especially considering the price point. Honestly, I was stunned. No obvious boosts in the upper or lower frequencies was present that so many speakers in this price range and above tend to deliberately do for that wow effect on a showroom floor.

TST2 Impedance

The Sencore consistently measures impedance one ohm low. While the specs say that these speakers are 8 ohms, I measured 4 ohms at the terminals. Given the high efficiency of these speakers, I’d consider them an 8 ohm load. tSc employed a zobel network for the tweeter to pad down the response and smooth out the impedance curve. You can see by the impedance minima that these speakers are tuned around 30Hz which is what the manufacturer claims and about what we measured in our frequency sweeps.