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stereo coffee

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About stereo coffee

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    Chris

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  1. Wikipedia is unique in that everyone is able to contribute and edit what is there. if its not as you say academically solid, you can correct, or influence correction of what is there. This also adds for everyone's advantage that it is pretty well free of bias as well, and in the process significantly benefits society.
  2. Trouble is they don't usually meet to discuss each others requirements. Not discounting there may already be products seeing the current drive method as beneficial, particularly products from active speaker manufacturers. Rather generally presently physics wins, and few of us presently benefit, as EMF deriving from the voice coil motion, sums with the voltage applied to the driver, resulting in a mixture of the original signal and spurious signal corrupted by the speakers own mechanical electrical and acoustic properties. It goes without saying a current driven ampl
  3. It does encompass quite a few owners of speakers, are yours 4 way ? what would you suggest ?
  4. Good question, I think a three way design and a two way design, and electrostatic where available should form part of all amplifier tests. The tables would begin to turn to show preference I think for simple crossover networks. A standard reference with two way being the LS /3,5a, i don't think any speaker other than maybe the ESL57 has received so much research. With 3 way lets plumb for a Yamaha NS1000 , and electrostatic the venerable ESL57 As long as testers were testing with each type ie 2 way, 3 way and a electrostatic is the emphasis, rather than resort
  5. There is very little marketing in a well written 342 page book, rather more so an enormous passion by its author to solve why voltage drive is far from complete, even at welding type currents. Would you like me to send it to you ? Having read it it you can reflect on the all too common welding approach, and perhaps better see why it is incomplete, vs current drive. A simple example is if we consider the resistance portion of a high impedance loudspeaker as being a simple form of current drive, as its resistance portion is partially allowing current driving of a norma
  6. There is very little marketing in a well written 342 page book, rather more so an enormous passion by its author to solve why voltage drive is far from complete, even at welding type currents. Would you like me to send it to you ? Having read it it you can reflect on the all too common welding approach, and perhaps better see why it is incomplete, vs current drive. A simple example is if we consider the resistance portion of a high impedance loudspeaker as being a simple form of current drive, as its resistance portion is partially allowing current driving of a norma
  7. However current drive amps, with advantage of eliminating major distortion, can be obtained https://www.integeraudio.com/ or DIY built https://www.current-drive.info/9
  8. Hi Andy You are right , yes I was associating planars , thinking of them just as electrostatics, when there are many varieties of planar speakers. The Maggies as you show being exceptional with their impedance, that part of impedance related to resistance, being very flat indeed.
  9. When amplifier manufacturers rate power amplifiers they do so into a variety of resistance loads, loudspeakers as @Quark informs are different, in that they present to a amplifier a reactance which stores some of that energy and later releases it. Impedance differs to resistance as it is the contribution of both resistance and reactance. Here is a graph showing a solid state amplifiers ability into a number of resistance loads. it can provide some indication if we fall for thinking loudspeakers represent resistance, but that is not the case, as few of us enjoy the heat of a resist
  10. That is an interesting strategy move by Sony, one way round it may be a HDMI splitter and installing a separate HDMI capable monitor, so you can see what it is doing. Sony really need to fit 2x HDMI port. As you say, you might want to play a CD but not have your television on. I would be interested to see how they explain, their lack of display, but also not a bad idea either, as it makes noise in circuitry much less.
  11. You will usually find manufacturers that are specialist at building microphones are also offering good headphones. as example Sennheiser, AKG, Audio Technica. Choosing headphones I would suggest needs audition. A good all round headphone, that is consistently good with audio reproduction and comfort & is easily in your price bracket is the AKG701
  12. Certainly here to help , the thread is asking about "How can I run out of gain" To understand gain one needs to know about consumer line level, as that is what is output from a CD player in every day use. It is a nominal figure of 0.310mv RMS ... which plainly is not 2V . Power amplifiers are always servants to their input signal. They are tested and measured with a set usually RMS input level - to deliver a wattage into a resistive load, and have ability during that test to drive a speaker cable - but rarely is a actual speaker used. So discussing gain with
  13. Yes because a Audio Precision SYS2722 system, is not a CD ... is it ? rather it is a audio analyzer, far removed from what consumer line level audio provides with the CD format.
  14. But consumer audio sources don't deliver 2v they only deliver consumer line level which is shown here, stated in RMS and shown in light blue using audacity.
  15. Its simply a matter of coming to terms with consumer line level, which requires, if you require no reactance in between, ... for power amps to be of similar sensitivity, as exampled. If you happen to some how be convinced that adding reactance in between your source and power amp, is desirable, you need to solve firstly that amplification, to achieve different sensitivity, to then match to a higher sensitivity, always adds undesirable change away from the capability of the source. That change is complex but is mainly reactance, which differs to resistance in profound ways, whic
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