Jump to content

MLXXX

Members
  • Content Count

    7,012
  • Joined

  • Last visited

Community Reputation

548 Excellent

1 Follower

About MLXXX

  • Rank
    5000+ Post Club

Profile Fields

  • Location
    Brisbane (ex-DTV Forum member)
  • Country
    Australia

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. I haven't noticed any apparent issues from solar inverter hash with my own equipment. And, as I've said, I'm not aware of any recording on the net that illustrates it. At this point in time, solar inverter hash is not on my radar as an active concern. People in rural communities using off-grid power exclusively could presumably be at greater risk as in some cases 100% of their power will come from an inverter (using batteries charged using photo-voltaic arrays and/or wind turbines, possibly supplemented by a petrol or diesel generator).
  2. MLXXX

    What creates Imaging/sound stage

    Well put, @Ittaku. In my world of small informal string quartet ensembles we sometimes do just use two microphones in an XY configuration, and some of the YouTube recordings on the net of small groups will reveal a small portable recorder immediately in front of the group, with XY oriented mikes. That simple method can be quite effective. However, as you have mentioned, so often (more often) there is a great variety of mikes, mixed together (e.g. using different extents of pans between left and right for each mike). It really is remarkable how that complicated mix can end up sounding like a natural sound stage.
  3. MLXXX

    What creates Imaging/sound stage

    I have not asked you for any answer, @davewantsmoore. I made a simple observation to the effect that speaker separation as it interacts with microphone positioning and mixing of the recording will affect the perceived sound stage for the listener, and likely affect the apparent width of it. If you doubt that, as apparently you do, try listening with speakers 1 metre apart, and then with them 4 metres apart, without changing your listening position in front of the speakers. The important point for you to grasp (if you haven't already) is that the differences between the Left and Right signals in a stereo recording as regards things like amplitude, timing and phase are only the starting point for the creation of the illusion of a sound stage. The actual particular illusion created is a function of many variables including the speaker cabinet separation distance and the listening position. And the listener's own real life experiences in concert halls and other listening spaces and their internalised model of how certain performers or instruments should sound at a distance will come into play to a degree. There is no guarantee that two people will perceive the sound stage with the same relative positioning of the performers, even if taking turns to sit in the same listening chair. Perception of a sound stage involves the imagination, not just basic hearing. The OP has posed quite a complex question.
  4. MLXXX

    What creates Imaging/sound stage

    If your speakers are wider apart then the A B configuration microphones were, there's a good chance the choir will sound more expansive side to side, as if you were sitting or standing near to it. If your speakers are very close together there's a good chance the choir will sound restricted from side to side, as if you were sitting or standing far away from it. This raises the question of what we are trying to achieve when we listen to music. Do we want something to sound as it might have sounded to us seated in an auditorium, or do we not really care very much? With photography, the default is go for accurate colour temperature, but sometimes we could intentionally change the skin tone to achieve a certain look. Real estate photos taken with wide-angle lenses make small rooms appear larger than they really are. Depending on speaker placement, and depending on the microphone placement and mixing in the recording, you could end up with a small chamber orchestra appearing to occupy as much stage width as a full symphony orchestra. Would that matter? It might be a case of personal taste.
  5. MLXXX

    What creates Imaging/sound stage

    The analysis of the correlation between apparent sound stage you perceive at the listening chair and the Left and Right channels of a stereo recording is typically not straightforward. If for the recording there were just two microphones placed next to each other at at an angle (e.g. the so-called XY configuration) and your speakers are metres apart, headphones might give a better stereo image. And then you can have two microphones placed metres apart for a recording (e.g. for a choir) in the "AB" configuration. Are your home speakers wider apart than the microphones were, or closer together? It's remarkable that we can perceive a realistic sound stage in a case where our speakers are positioned very differently to how the microphones for the recording were placed!
  6. I'd suggest that some of the camera manufacturers could do well to improve the user friendliness of the control interfaces. A "proper" camera these days has a great number of knobs and buttons and the learning curve for all of these is considerable. Importantly, it's not always obvious how to select the fully automatic mode (automatic aperture, exposure, focus, white balance). In comparison, basic use of the still and video camera functions of a smart phone is typically very straightforward.
  7. The reservoir electrolytic capacitors following the rectifier typically reduce the full-wave rectified mains to such a low level of 100Hz ripple that hum is not readily audible if that power is used directly (e.g. to power an output stage). Inverter hash at the primary of the power transformer will be at a much lower amplitude than 240V AC, perhaps just a few volts, and at a much higher range of frequency components than 100Hz, and will thus be easier to filter out than 100Hz ripple. (Typically, linear power supplies have small value capacitors in parallel with the main reservoir capacitors to attenuate higher frequency components that the parasitic inductance of the electrolytic capacitors might present too high an impedance for.) If you are doubtful, simply apply oscilloscope probes to the DC rail at that point, measure the 100Hz ripple amplitude and then try to find the amplitude of any other frequency components. After that, the main supply rail is typically regulated, further reducing 100Hz ripple, and any hash not already removed by the filter capacitors. You could try measuring the ripple etc, after the voltage regulator. (After that, typically the supply rail may be further decoupled with resistors and capacitors for any extremely sensitive low signal level circuitry.) Based on the above type of design, the chances of hash making its way through to critical parts of the circuitry should be remote. It's possible, but unlikely. I'm not sure what you mean by "lifeless and ordinary". Amplifiers are generally designed to be neutral. Conventionally, they should not add colour. If you prefer amplifiers that add a sonic signature, and you find that that sonic signature varies with the supply voltage, or with hash, that of course is your choice. At the risk of stating the obvious, the result of having voltage regulation in the design of an audiophile device is that its critical circuits are fed with a virtually constant voltage (unless the mains voltage varies to extremes). And (as I mention above in this post) the result of standard practice in power supply design for an audiophile device is that inverter hash should normally be filtered out by the power supply filtering. If typical hash levels from an inverter produce an audible difference, then we would expect higher than normal levels of hash from a really poor inverter to produce an even greater audible difference. It should be feasible to capture that even greater level of audible difference with something like the Zoom H5, perhaps not in its full "glory" but at least to the point that some difference could actually be heard. If no one has bothered to do that, and upload specimen A and B recordings to the net, what does that suggest to you, @rawl99? It suggests to me that we are in the realm of extremely minor differences. I would be far more persuaded there was something to worry about if someone could team up a really bad level of solar inverter hash, with a really vulnerable device (perhaps a DAC) and record the really bad effect that the really bad level of hash has constantly (or even occasionally) on the output of that very vulnerable device. In my household we have a standard good quality inverter (SMA Sunny Boy) and to my knowledge none of the audiophile equipment is highly vulnerable to inverter hash, so I am not in a position to make the type of recording I have described in the preceding paragraph.
  8. The cordless phones work fine at my place too, it's just the wi-fi.
  9. @Addicted to music, I find it annoying that the kitchen microwave oven when operating stops my wi-fi from working properly, actually causing the connection to drop out, even though the wi-fi devices are quite some distance from the kitchen. (I'm not aware of any effects from the 5kW solar inverter, other than the fact that it reduces my electricity bill!)
  10. Teenagers tend to have a more extended upper audio frequency limit of hearing than adults. As a teenager I could hear the vibration from a CRT television set horizontal deflection coil inside a black and white TV set, from across a room. This would have been at 15.625kHz. I recall that adults generally could not hear the faint whistling sound. I don't think though that a solar inverter would use a frequency below 20kHz. So I'm not sure a teenager would hear a high pitched sound if they got near an inverter. As for inverter hash carried along power cabling to a household power point, it would cover a broad spectrum of frequencies but would generally be attenuated to a negligible level by the power supply circuitry of an audiophile device. Theoretically there could be exceptions, i.e. audiophile devices that get triggered into poor performance by even low levels of residual hash in their DC supplies. (And there would be some audiophile devices that would be triggered into poor performance by stray electromagnetic fields.) _____ Can anyone point us to a recording of an audio signal that has been adversely affected by power supply hash? It would be nice to have a concrete example to listen to!
  11. Just one "other" person to do the listening can work well. As I mentioned before, if you have a group of listeners, you would need to guard against mutual influence, including unknowing, unintentional influence. That could be interesting.
  12. Not my experience. For example some years ago, using an ABX plug-in for foobar 2000 I tested my ability to distinguish between a 24-bit sound file truncated to 16-bits and the same file dithered to 16-bits using a noise-shaped dither. There wasn't much difference in the sound for my ears but there was enough for me to pass the automated ABX test, alone. I cannot see the advantage of sitting with others when doing a precision listening test such as the above. Are your answers your own perception, or your own perception unconsciously influenced by reactions of people around you? Anyway, this discussion has become rather general. We should be discussing possible impacts of solar inverters on sound quality.
  13. You haven't described the "experiment" in any detail. Was it a sighted test? If so, I'm sorry but that carries extremely little weight with me. If my approach offends you, I'm sorry. There have been too many occasions when I have thought I heard a difference, but when I tested myself over 10 or more trials, unsighted, I failed.
  14. Or: the mains power is not clean and the hash filter does a good job cleaning it up, but the source component can tolerate, and is unaffected by, the dirtyness, or MLXXX's hearing is not up to the task, or the main amp is not up to the task [lacks "resolution" is a phrase I've heard]. I include the last two dot points above, because if the type of effect we are talking about can be so subtle as to escape detection with a portable sound recorder, it could also escape detection when listened to live with my ears, through my system's main amp and speakers. Anyone interested in knowing how close their mains supply is to a sine wave could use a suitable attenuation pad and make a recording of it at say 96kHz and 24 bits and then use software to analyse the distortion products, or any other spurious components present in the nominal 50Hz waveform. Or use a suitable modern oscilloscope with analysis functions built-in.
  15. Kind of you to say. I think I'll go back to my seat in the audience now. (Quit while I'm ahead.)
×