kijanki
Responses from kijanki
| Shocked. Need Opinions. How muck power do I need? Required output current at min load can be calculated. My Benchmark AHB2 delivers continuous 100W at 8ohm requiring 3.5A current. Let's assume even 5A to give it 100% overhead (200W). Current will be 4x higher driving 2ohm load (8/2=4) to keep t... | |
| Shocked. Need Opinions. How muck power do I need? For every decibel volume increase above 86db requires double the power. For every meter distance requires double the power. Double the power will increase volume by 3dB (+23% perceived loudness) Volume drops at double distance by 6dB. To keep... | |
| Shocked. Need Opinions. How muck power do I need? With 40W it will be -2.7dB. Perceived loudness will be 16.6% lower (still over 100dB) | |
| Importance of clocking @greg_f I forgot that it is specific Audio USB and Firewire. AES seems to be the best choice. | |
| Importance of clocking @greg_f You can try USB to Firewire adaptor (or cable). They are about $5 on Amazon - might work. | |
| Importance of clocking @greg_f I remember that Weiss DACs had Firewire. I had Firewire HDs with my old Mac computer and used them with the newer generation with an adapter. Advantage of Firewire was that it had, being extension bus, sustained bandwidth. Peripheral buse... | |
| Importance of clocking @greg_f There are two different ways of dealing with S/Pdif. One, very common way, is to adjust D/A clock to average frequency of incoming S/Pdif stream while another is to completely ignore S/Pdif clock, strip the data and send it to D/A conve... | |
| An argument for fuses and maybe power cables in power amplifier Linear power supply is really a primitive switcher operating at 120Hz. Current is drawn from the mains in narrow spikes of high amplitude, that become wider when load increases. In addition rectifiers become reverse polarized at the peak of the ... | |
| Importance of clocking Let‘s just say that my ears and reputable designers like Innuos, Esoteric et al disagree with you Disagree with what? I don’t question you can hear the difference, but I attribute it to electrical isolation that device brings and not the reclo... | |
| Importance of clocking AFAIK there is no error correction with asynchronous USB. Frames contain checksum (CRC field), but I’m not sure if computer resends the frame. In plain USB transfers device on receiving end sends back “negative acknowledge” (NAK) and frame is re... | |
| Importance of clocking @antigrunge2 What processor? The only one that can affect timing of D/A converter is in the DAC. It loads samples from the buffer into D/A converter at even time intervals. It also signals back when buffer is too empty or too full. Sending as... | |
| Importance of clocking Releasing a dirty stream to the D/A increases its processing No it doesn’t, latency has nothing to do with it and buffers are never “underutilized” because of back signaling. Perhaps example will help: Worker (DAC) has to place items on conve... | |
| Importance of clocking What about the clock accuracy releasing the buffer, then? It is internal DAC’s clock that is unaffected by any external activity (asynchronous). DAC uses this clock to take sample of the data from the buffer and convert it to voltage at exac... | |
| Importance of clocking Buffering is not a recipe for avoiding jitter. Yes, it is. With asynchronous USB data is delivered in packets (frames) to buffer at some time intervals, for instance 1ms - for instance 44 samples, DAC delivers each sample to D/A converter in... | |
| Meter for measuring cable capacitance It is “distributed capacitance” - you cannot measure it directly. What you measure is a combination of capacitance, inductance and resistance of the cable. I wouldn’t trust the meter, even when it displays sensible numbers. There might be more ... |