Instruction/ maintenance manual of the product X250 Pass Labs
Go to page of 14
P age 1 Pass X250 Owner's Manual.
P age 2 The X250 stereo a mplifier e mbodies the d esign tech nology and re fineme nts of th e larger "X" series ampl ifiers i ncluding extensi ons o f the pat ented Sup ersy mmetry circuit. The Supersy mmetr y cir cuit topolog y w as granted a U .
P age 3 Setup You can posi tion th e ampli fier any w here y ou want, but i t requir es ventil ation. We do not recommend placing i t in enclose d cabinets or s mall closets w ithout means for air to circulate freely . The ampli fier idl es at ab out 270 w atts.
P age 4 get fixed. We go to a lo t of trou ble to make prod ucts reli able, a nd the failure r ate o f our amplifiers is ver y low . This is sm all comfor t to the few , but take it easy an d giv e us a call i f you have probl ems. People are i nteres ted i n how long it takes for these ampli fiers to break i n.
P age 5 Interconnects and Speak er Cables W e hav e a general recommen dation a bout interc onnects, whi ch is that they shoul d cost less than the a mplifier . W e have tri ed a lo t of pro ducts and most o f them w ork w ell, but as a practical matter w e cann ot make bl anket rec ommend ations.
P age 6 Warranty Information This prod uct is w arranted for part s and la bor from t he dat e we ship i t. Check w ith th e factory authoriz ed distr ibutor in the countr y y ou are purc hasing this pr oduct for speci fic warr anty information. Distri butors are only r equir ed to offer w arranty serv ice on Pass products th at they have sol d.
P age 7 Once it was r ecogniz ed that ex cessiv e use of negativ e feedback w as creati ng proble ms with the soun d, sev eral desig ners addr essed th e proble m by si mply r educing th e amount of feedback and regai ning the perfor mance by payi ng more at tenti on to the c haract er of th e amplify ing ci rcuit itsel f.
P age 8 Rushing to market in the 70’s wi th their low T IM distortion designs, c ompanies e m ploy ed either simpler or more complex circuits to achieve high slew rates. The ampl ifiers that had si mpler circuits w ith fewer parts t ended to so und better than th e amplifiers w ith complex circuits an d a lot of parts.
P age 9 Supersym metry does n ot reduce t he distorti on and noise pr esent in either hal f of the output of the balanc ed circuit. Co mparing the distortion curv es before a nd a fter the ap plicati on of supersymm etry , we see essen tially no difference in ei ther h alf of the balanc ed pair consi dered alone.
P age 10 ultimat ely w e f ound t hat w e could operate it w ithout feedb ack as l ong as w e put a he althy bias current thr ough it. For these am plifiers this is abo ut 600 w a tts worth. This is not pure Class A operati on in th e contex t of 1000 w atts output, but it has proven t o be the a ppropriate am ount.
P age 11 intrinsic ma tching between th e circuits, (c) th e distor tion o f each hal f wi th supersymm etry, and (d) the differenti al dist ortion w ith supersymme try. On this cur ve (B) we can cl early see that intri nsic sym metry due to the matching of the tw o halves r educes th e distorti on by a factor o f 10.
P age 12.
P age 13 X250 distor tion curv e.
P age 14 X250 SPECIFICA TIONS All figur es obtai ned after 1 hour w armup, with r egulated 120 V AC power line. See manu al notes ab out AC p o wer line reg ulation.
An important point after buying a device Pass Labs X250 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Pass Labs X250 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Pass Labs X250 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Pass Labs X250 you will learn all the available features of the product, as well as information on its operation. The information that you get Pass Labs X250 will certainly help you make a decision on the purchase.
If you already are a holder of Pass Labs X250, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Pass Labs X250.
However, one of the most important roles played by the user manual is to help in solving problems with Pass Labs X250. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Pass Labs X250 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
