Questions

Answers

  • How is Anedio A2 Amplifier optimized for passive bi-amplification?

    Anedio A2 amplifier offers an important advantage in implementing passive bi-amplification—immunity to ground noise with multiple amplifiers.  Often, connecting two amplifier channels for bi-amplification generates more ground noise because of the additional ground loops.  In Anedio A2, the bi-amplification feature was conceived at the very beginning of the design stage, not as an afterthought, and was optimized in such a way that it does not cause any increase in ground noise.  Even when the two amplifier channels are configured for bi-amplification, the noise level remains extraordinarily low.  Moreover, the bi-amplification mode is activated with a built-in switch, and there is no need for an external Y cable.

  • What are the benefits of passive bi-amplification?

    In passive bi-amplification, two amplifier channels are used to drive a single loudspeaker, with the low and high frequency crossovers disconnected from each other. Passive bi-amplification has all the advantages of bi-wiring in that low-frequency currents flow through a separate cable and does not modulate the high-frequency path.  More significantly, the low and high frequency crossovers are completely isolated from each other through the separate amplifier channels, eliminating any possibility of nonlinear interaction between the crossovers.  The resulting improvement, depending on the system, can be dramatic, revealing another layer of sonic information.

  • What are the most important factors in setting up loudspeakers in a room?

    Two factors stand out—symmetry with respect to reflecting walls and space around the loudspeakers.  First, the reflecting walls behind and side of the loudspeakers must be symmetrical.  Asymmetry between the left and the right side will confuse the imaging of the sound stage and will make it blurry and unstable.  Second, the loudspeakers need to be placed at least 3 feet away from reflecting walls.  The time delay between the direct sound and the reflected sound improves clarity, intelligibility, and the sense of space.

  • Recommendation for speaker cables?

    There are many types and brands of speaker cables in the market, and many can be recommended.  At audio frequencies, the skin effect is negligible, and it is unnecessary to spend large amounts of money in cables that try to minimize the skin effect.  Instead, I prefer cables that offer better immunity to electromagnetic interferences, which have been demonstrated to be a real problem, especially for long cables.  I have used coaxial cables (e.g. Mogami 3082), twisted pair cables (e.g. Dayton SCP), and star quad cables (Canare) with excellent results. They also tend to be inexpensive since manufacturing processes for making these are widely available.

  • How important are speaker cables?

    Speaker cables do contribute to the sound of the overall system, but not as much as what is often claimed by audiophile cable manufacturers.  Expensive cables do not guaranteed sonic improvements and are often unnecessary.  Since audiophile speaker cables vary greatly in their construction and impedance, one particular cable may not necessarily work with all amplifier-loudspeaker combinations.  Some are either too capacitive or too inductive and can make certain amplifiers oscillate. Regardless of the type of the cable, it is important to remember that the best cable is no cable.  The signal can never be improved by going through more of the cable.  Thus, one universal practice to improve the sound is to minimize the length of the cable by placing the power amplifier between the two loudspeakers.  In a typical home system, the length of the cable can be kept under 5-8 feet so that the cable itself would become less of a factor.

  • What are the benefits of bi-wiring?

    In bi-wiring, the low and high frequency crossovers are separated, and the signal current flows through two separate cables.  The low-frequency current flows only through the cable connected to the woofer, and does not modulate the high-frequency path.  The improvement is subtle but significant at midrange and treble.

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