kijanki
Responses from kijanki
| Class D Technology AFAIK, class C is a poor choice for audio (better for FM transmitter). | |
| Warm-up time for amps and preamps It is simply drying out of electrolyte. Every 10 degrees Celsius temperature increase cuts capacitor life by half. Presence of voltage on capacitor is beneficial since it is rebuilding dielectric layer (aluminum oxide). Without voltage electrol... | |
| Class D Technology I'm not sure what NuForce are doing. It is possible that they adjust supply voltage to signal level, but that would only mean much lower noise (than for instance Icepower) at low signal levels. Noise level at max loudness would be the same as f... | |
| Class D Technology You might damage membrane from overheating, but most likely not from 500kHz switching frequency. As for switching frequency level following signal level - your understanding of class D output is poor. Amount of switching noise is constant independ... | |
| Class D Technology Switched voltage 50-80V represent the highest output voltage. They show switching noise riding on a very small signal. This signal of 1V peak represents 63mW of the root frequnecy + harmonics on the 8 ohm speaker. | |
| Class D Technology Stereophile test shows about 0.5Vp-p - that is about 1% since switched voltage is in order of 50-80V. It comes from the fact that output filter is 2-pole making it -40dB/decade while switching frequency is about decade above filters cutoff fr... | |
| Class D Technology Talking about Spread-Spectrum during cold war could put you in a prison (top secret). Today all CDMA cellphones (Verizon, Sprint etc.) use spread spectrum. It is interesting application for class D, especially when receiver reacts only to averag... | |
| Class D Technology Perhaps this explanation will be easier to understand: If you make loop of a wire conducting electric AC current the radiated EMF will be proportional to loop area. If you reduce area to almost zero (like wires together in a cable) the radiated ... | |
| Class D Technology When electricity flows in two wires in opposite direction it tends to cancel radiated EMF or capacitively coupled noise. Same goes for receiving - the closer two speaker wires are - the less susceptible they are to pick up anything. Twisted pair... | |
| Class D Technology There is about 1% of switching voltage noise on the speaker cable since filter is not perfect but, as I said before, 1/300 wavelength antenna won't radiate. In addition, electricity in speaker cable flows in both directions canceling the most of ... | |
| Warm-up time for amps and preamps rvpiano, I second you on the Scotch - very effective. | |
| Warm-up time for amps and preamps I’m running a Class D Taranis by Merrill Audio. Got a bit concerned by rvpiano’s tech’s comment about "on with no input signal" being bad for Class D. There is absolutely no reason why running without input signal would be bad for any class D ... | |
| Class D Technology Maybe we will start seeing Class D preamps then... Perhaps. Delta-Sigma D/A, A/D converters, SACD and DSD are already class D. | |
| Class D Technology Speaker cables would be a very poor antenna. Since wavelength of 500kHz switching frequency is 600m a typical 2m cables would be 1/300 wavelength antenna. Usually antenna becomes rapidly ineffective below 1/10 of the wavelength. | |
| How do you know if your amp is putting out @ Rated Wattage ? According to my calculations it is about 11xPerceived loudness increase = k^(1/3.5) , where is ratio of power.11^(1/3.5) = 1.984http://www.aes-media.org/sections/pnw/pnwrecaps/2006/jj_loudness/Some studies mention k^0.3 (10^0.3=1.995) |