darTZeel NHB-108 model one User Manual

Also see for NHB-108 One: Owner's manual

darTZeel NHB-108 model one User Manual Manual pdf 8 page image

darTZeel NHB-108 model one User Manual, version B 1.0 Page 8 of 354. Who am I?Your darTZeel NHB-108 model one bears, on itsfront panel, its Identification Plate (1). On this 24kgold plated brass plate are engraved your name, andthe serial number. Do not unscrew the plate since itis the identity card of your machine!The serial number can be read as follows:TZ-XY1081.dcbZX = Century of makingY = Batch numberdcb = Identity in the batch numberZ = Version (A or B)Example:The sample bearing the serial numberTZ-UC1081.001BIs the first machine of the third batch, made in the21 st century, and of version B. This numbering isthus valid until the end of the 26th century.From the second batch, we chose to manufactureonly the darTZeel NHB-108s in version B. Actu-ally this version even offers some slight improve-ment over the version A. If you want to know howthe version A differs, please visit our website atwww.darTZeel.com, where you can download theprevious manuals.It is vital to bear in mind all the following notesand remarks concerning the use of yourdarTZeel NHB-108 model one.Thank you.5. Connecting and setup5.1. Important prior noticeIn order to protect the loudspeakers, your darTZeelNHB-108 model one features a special monitor-ing circuit. If any abnormal situation is detected,this circuit will intentionally melt the power fuse(s).This behaviour is not be interpreted as a failure.The NHB-108 has been designed to behave thisway, in line with our philosophy of not spoiling thesound by adding any protection circuit in the signalpath. If you want to know more about this specificcircuit, also called Crowbar, please refer to thetechnical section, in chapter T6.5.2. LocationBefore making the first connection, you shouldthink carefully about the location where you aregoing to put your gear. If you planned to fit yourdarTZeel NHB-108 model one into furniture,please bear in mind that you must allow at least oneinch of free space all around the unit, for propercooling.If you do not respect this, the darTZeel NHB-108model one may stop playing if it becomes too hot.The heat sinks shutdown point is at around 70°C,and the power supply starts up again when the tem-perature has dropped to 55 °C.Please also note that permanent excessive tempera-ture will reduce the life span of your machine. Readthe technical section at the end of this manual if youwant to learn more about this topic.Anyway, if possible, always leave enough spacearound your darTZeel NHB-108 model one, allow-ing you to gain easy access to it when making con-nections.5.3. Speaker impedanceThe darTZeel NHB-108 model one can drive virtu-ally any loudspeaker, provided its nominal imped-ance is between 1.5 and 8 ohms. Above 8 ohms,maximum available power output will be slightlyreduced, but without any sound quality loss.Nominal standardized impedance can vary by ±20%, and can thus reach the following criticalminimum values:6.4Ω in the case of 8Ω speakers3.2Ω in the case of 4Ω speakers1.6Ω in the case of 2Ω speakersIf your loudspeakers are between 3Ω and 8Ω,which is nearly always the case, you can directlyhook them to the Speaker Terminals (6).Black terminal (upper) = Ground.Red terminal (lower) = Live signal.If your loudspeakers impedance is less than this, orif you want to parallel 2 pairs of 4Ω speakers, youmust go to chapter 6.3. "User parameters" beforeyou consider going further.If you do not respect the above, you may encountersome blown fuses when playing music at loud lev-els.CAUTION: You must connect your loudspeakers tothe Speaker Terminals (6) before powering ONthe darTZeel NHB-108 model one!