atmasphere
Responses from atmasphere
| Listener fatigue: what does it really mean? Csontos, the 2nd harmonic is considered musical to the human ear (contributes to the coloration known as 'warmth' or 'richness'), and is not used as a loudness cue. Its the 5th, 7th and 9th that are, and they are likely to be in slightly higher nu... | |
| Stand out phono stages Lacee, with respect to the volume control, it will work better if it is buffered in some way from the amp or interconnect cable it is driving. For this reason I do not think that having an outboard phono section is a good idea. It works better whe... | |
| What component is responsible for dynamics ? There are two ways the term 'dynamics' is used by audiophiles.In the vast majority of cases, the word 'distortion' can be safely substituted in the conversation without changing its meaning.This is because the human ear uses odd ordered harmonics ... | |
| Zu Soul Superfly 8 ohm experiment Its really important with a transformer-coupled amplifier to load the tap of the output transformer at the impedance it is designed for.If you put a 16 ohm load on the 8 ohm tap, the transformer can ring (add distortion) which will make it brighte... | |
| Fourier Panthare opinions Rleff, its OT but there are some simple mods that make the Sound Labs a lot easier to drive and also has them sounding better. Sound Lab also has a new backpanel that reflects what some of these mods are about. PM me if you are interested in the m... | |
| Bass leaves after amp warms up? OK. Based on the testimony so far we can safely assume that hearing has nothing at all to do with it.I am also doubting that the interface between the amp and speaker is an issue. If it was, the bass would be a problem as soon as you turned the am... | |
| Listener fatigue: what does it really mean? Csontos, you put your finger on the leading edge of what is possible with transistors.Here is one of the difficulties you are dealing with. Transistors have a non-linear capacitive aspect inherent in the junctions of the devices. In fact some semi... | |
| Bass leaves after amp warms up? Kijanki, its not about incorrect bias. Its about current limiting due to temperature.I always liked the MOSFET and later types of amps over the earlier bipolar designs because they sounded smoother. But one thing I didn't like about them was that ... | |
| Listening fatigue Here is some additional information on lister fatigue that I have copied from the Teck Talk forum:"Listener fatigue is nearly always a consequence of distortion.Two distortion sources are IM distortion and odd-ordered harmonic distortion. Both are... | |
| Using autotransformers Al, we use such a device in our MA-3 amplifier http://www.atma-sphere.com/Products/#MA-3Otherwise the amp would draw the line voltage down in a lot of situations and not make full power.Depending on the power requirements you might be able to use ... | |
| Listener fatigue: what does it really mean? Csontos, you are spot on.The specs an amplifier has on paper don't reflect the whole story though. An amplifier with very low distortion with steady state signals (sine waves, used to test for distortion) can act quite differently when asked to re... | |
| Stand out phono stages Lacee, there is a simple way to drive any power amp in the differential domain. Most designers don't know their amps have the capacity and so don't provide the connection. PM me if you want more details, or perhaps we can discuss it in a different... | |
| Bass leaves after amp warms up? The complaint is one I have come to associate with MOSFET output transistors. A small fan can indeed help. The amp may not run all that hot but MOSFETs have a quality where the warmer they get, the more they limit current. So you want to keep them... | |
| Listener fatigue: what does it really mean? Listener fatigue is nearly always a consequence of distortion.Two distortion sources are IM distortion and odd-ordered harmonic distortion. Both are known to be irritating to the human ear- and this has been known since the early 1950s. What is le... | |
| Using autotransformers The term 'autotransformer' is a new one on me, and I have been a technician and engineer since 1974. I suspect that you mean something else. Which of the two below seem like what you are looking for?An autoformer has no ability to regulate voltage... |