kijanki
Responses from kijanki
| USB cable hype Axle, cable bad enough to corrupt bits would be disaster since each frame contains checksum and would be dropped. As I understand it each frame is delivered every millisecond and starts with unique bit sequence signifying start of the frame (SOF) ... | |
| Buying equipment Swarthy, I had the same dilemma - Hyperion Sound closest dealer to Chicago was in Pennsylvania. I decided to buy demo speakers anyway based on fantastic reviews and they proved to be great sounding. What I failed to understand was that company wit... | |
| External Drive Help I have good luck with 1TB Fantom drives. For about 10 years i use one at work for backup and one at home. I use it for the music, pictures etc. In addition I have two backups (total of 4 Fantoms). I keep one at home and one at work just in case of... | |
| USB cable hype Axle, asynchronous DAC controls the timing. Data coming from the computer is placed in the buffer. Every frame computer adjusts number of samples in the frame based on buffer under/overflow signal from the DAC. DAC takes data from the buffer and w... | |
| Jeff Rowland Bombaywalla, You are right - not many amps quadruples or even doubles power exactly. I don't even care for the one that does, since in order for this to happen amp has to have hefty power supply but also lots of negative feedback.On the other hand... | |
| USB cable hype There are two possibilities: You have synchronous USB DAC: Timing is controlled by the computer and is so jittery that your cable cannot possibly make any difference.You have asynchronous USB DAC: Timing is controlled by the DAC. Cable or computer... | |
| Jeff Rowland Ricred1, I found them very eager to help. Perhaps it was just the particular support person. Fortunately we have this forum to learn and share | |
| Jeff Rowland Ricred1, I stated 22% loudness increase, but it would be true for 2x loudness. I forgot that bridging doubles the output voltage, thus quadruples the power. In such case you can count on (substantial) 49% loudness increase. Speaker's minimum imped... | |
| Jeff Rowland Al is right (as usual). This amp most likely uses PASCAL S-PRO2 class D modules. Data sheet shows minimum load of 2 ohms or 4 ohms when bridged. Bridging might create problems with your speakers gaining only about 20% of loudness. Not worth trying... | |
| SACD & other Formats I've read interview with Roger Sanders. He believes that red book CD format is perfect and vinyl is inherently flawed. He quotes Nyquist etc. He forgets that Nyquist theorem applies only to continuous waves and fails short with short samples espec... | |
| Class D at low volume Tim, GNFB serves the same role in class D as it does in class AB - reduces distortions, widens bandwidth, reduces output impedance. It is not necessary for operation in general but particular circuit can be designed to depend on it.Since even shal... | |
| SACD & other Formats I have few CDs that sound incredible, showing that format limitations play small role compare to mixing. Compression is necessary for average Joe to listen on small size speakers without membranes buzzing, but in case of vinyl they know it is purc... | |
| Class D at low volume Bombaywalla, fig. 2 shows exactly how it can be done. For any input voltage corresponding duty cycle is created. Feedback would only improve performance. Modulator itself might be not 100% linear but most likely linearity error is created by the M... | |
| Class D at low volume Bombaywalla, Linear power supplies have regulation in preamps, DACs etc. but MOST of power amps are unregulated because of the amount of heat dissipated in power supply (and loss of efficiency).AFAIK older REF1000 and newer REF1000M use the same m... | |
| Class D at low volume Class D (PWM) can be easily constructed without negative feedback at all. NGF improves linearity, bandwidth and output impedance like in any other class of amplification.While global negative feedback in class A, AB is going over many stages of am... |