QSA Stones - Set of Two
QSA Stones are about 1.5" in diameter and about 1/4" high including the gem stone that sits on top. The stone itself is a brownish color, and the bottom is coated in a special noise absorbing material. This material can be seen painted onto their AC receptacles as well. The gem stones are also used on the upper tier outlets as well as the Red/Black fuses.
All three have the QSA effect of enhancing flow and naturalness of the musical presentation. Things relax, but are more resolved and 3D.
We use them on power supplies and power cords. You can place them on top of or below components where the power supplies are. Resting another Stone on a power cord has a very similar effect.
Placing the Stones in your breaker box is also a great way to reduce noise and increase the emotional engagement factor in your music. They work very will with the Bybee V2, Quantum Clarifiers, and DMT X1 too!
The stones may also be used as a room treatment, much like the Bybee V2's. In fact they really take the V2's to a new level!
3 types of stones
- Red = Warm - These seem to affect the upper bass and lower midrange primarily, affecting the decay of instruments and overall ambiance and lending real woodiness to wooden instruments, and a realness to the human voice. Upright bass, cello, violin, and acoustic guitar sound fantastic.
- Blue = Open - The Blue Stones reach the upper mids to lower range of high frequencies. This gives an openness to the sound. Things like reverb and hall decay start expanding well beyond the speaker boundaries. Things are less congested.
- Clear = Transparent - The Clear seem to affect the upper regions, aiding in transparency and clarity of the high frequencies. Cymbals are clearer and decay longer. Hall ambiance is enhanced and overall clarity and transparency are improved.
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The QSA stones work amazingly well. I placed one in my fuse box that feeds my listening room and one on my amp. As claimed, the red ones affect the upper bass and lower midrange mostly but I've found they also expand the soundstage and add a little warmth to the treble. Very highly recommended - and the price is reasonable.