darTZeel NHB-108 model one User Manual
Also see for NHB-108 One: Owner's manual
                                   | |
Contents
| 
darTZeel NHB-108 model one User Manual, version B 1.0 Page 32 of 35By switching the secondary windings accordingly,the power transfer is optimized and the power tran-sistors in the output stage remain within their safeworking range.So we can only use one single output transistor pairper channel. The signal path is shorter, uniform,and only passes though one silicon junction at atime.Music is thus reproduced with unprecedented ease,purity and fidelity, simply impossible with morecomplex designs.T7.3. Received ideaThis chapter devoted to power supplies would notbe complete without the following little addition,small in size but of great significance…It is usually admitted in the audio world, particu-larly in the high-end manufacturers' community,that output current availability is of paramount im-portance, to the point where one praises machinescapable of outputting dozens, or even hundreds, ofamperes.What nonsense!Until the contrary is proven, as far as we knowvoltage and current are in a certain relationship, asclearly stated by Ohm's law:IRV •= RVI = IVR =It is of course the same equation, just written in its3 most usual forms.Now, let us take an ideal amplifier, capable of de-livering exactly 250 watts/8Ω, 500 watts/4Ω, 1000watts/2Ω, and a whopping 2000 watts/1Ω.The currents needed to deliver these abundant andgenerous powers are, respectively, of 5.6A, 11.2A,22.4A and 44.8A.Yes, we have to admit that the last figure is quitehigh… So, this amplifier can deliver roughly 45amps under 1Ω.Now say that you own speakers having an imped-ance of 6Ω, much easier to drive than 1Ω. Howmany amperes will this imposing amplifier deliverto your loudspeakers? 45 amperes with a big smile?Not at all!Given Mr. Ohm's law, the amplifier will deliver atits best 333 watts, say 7.45A under 44.7volts.So you can see that in the real world, you just need7.5 amperes, not 45. Let us confess that for 333(!)watts, this is quite reasonable…Do you now better understand why "Lots of Am-peres" does not necessarily mean "Superb Bass"?T8. The sound of darTZeelIt is always hard to define objectively what we per-ceive subjectively, isn't it? How to enjoy an excel-lent glass of wine, if not sharing it with friends?We could say that the darTZeel NHB-108 modelone offers an outstanding temporal linearity, allow-ing true three-dimensional re-creation.We also could say that the bass is deeper than theMariana Trench, with every nuance incredibly ren-dered.We could add that voices are so sweet and timbresso accurate that you will turn your head, believingthat someone has just entered the room.We could even conclude that no cymbals can bebetter reproduced than through our machine.Instead, we will just invite you to take a seat andlisten to some good music…After all, if you read this manual, you certainlyalready own a NHB-108 model one, and youknow better than anyone what we are talking about.So why do we need to produce any further advertis-ing? In fact, just for the fun of it. And music is funtoo, isn't it?T9. ReliabilityT9.1. Quantified longevity"How long does a darTZeel NHB-108 model onelast? Before first failure?"Well, let’s us try to see a bit more clearly, and seeka better understanding of the different causes offailure…Assuming that the first possible failure will be dueto the weakest component, we could be tempted toinstall only the longest lasting components.Is the first criterion, "Purity", compatible with "Re-liability"? If a component lasts twice as long asanother, but sounds twice as bad, what would be thelesser evil?Before giving a firm answer, it is interesting to askourselves what are the most influential parametersaffecting the life span of a given component. Sev-eral studies show that one key factor is heat.This might seem obvious, and we have all experi-enced once in our life the consequence of leavingour beloved CDs – or cassettes for the most experi-enced of us – under our car’s rear window on a hotsummer’s day… |
Related manuals for darTZeel NHB-108 One
This manual is suitable for:
manualsdatabase
Your AI-powered manual search engine