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Pass Labs 1XA160.5 - page 1
1 XA160.5 Owner’ s Manual pass ® XA160.5 Owner’ s Man ual April 25, 2007 ...
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Pass Labs 1XA160.5 - page 2
2 XA160.5 Owner’ s Manual Nelson P ass has been designing audio electronics since about 1971, first with ESS (remember Heil transfor mers?), and then for ming a new company , Threshold in 1975. Threshold pioneered the design of high pow er Class A power amplifiers and later , high pow er amplifiers using only local feedback (the Stasis series). P ...
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Pass Labs 1XA160.5 - page 3
3 XA160.5 Owner’ s Manual W e star t with simple FET circuits already having lo w distor tion and noise, and arrang e them in tw o symmetrical halves . T he tw o halves of the amplifier channel are closely matc hed, eliminating a larg e por tion of distortion and noise without feedback. A small amount of feedback is also applied, not so m uch for ...
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Pass Labs 1XA160.5 - page 4
4 XA160.5 Owner’ s Manual All the usual perfor mance metrics - pow er, distortion, noise, input impedance, damping factor and bandwidth ha ve all been impro ved in this latest generation. T he po wer supplies are larger, with fast rectifiers gating to larg er capacitor banks . The increases in A C line noise w orldwide hav e been addressed with h ...
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Pass Labs 1XA160.5 - page 5
5 XA160.5 Owner’ s Manual SET UP X amplifiers r un at about the same pow er as their output rating, and XA amplifier r un more than twice that. The heat sinks on the side of the amplifier r un hot to the touch – about 25 to 30 degrees C. abov e ambient, so you can expect 50 to 55 degrees C. temperatures on the heat sinks . It is v er y impor ta ...
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Pass Labs 1XA160.5 - page 6
6 XA160.5 Owner’ s Manual The amplifier’ s voltage and cur rent rating are indicated on the rear panel. It will be either 240 v olts, 230 v olts , 220 volts , 120 volts or 100 v olts . The larg er amplifiers ha ve a circuit break er of the appropriate capacity . T he smaller po wer amplifiers use a slow- blow 3A G type fuse. The frequency ratin ...
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Pass Labs 1XA160.5 - page 7
7 XA160.5 Owner’ s Manual So the amplifier is sitting there unconnected. Make sure that the rear panel po wer switch/break er is off (down). Plug the A C cord into the back of the amplifier , and then into the wall. Then tur n the po wer switc h/breaker on (up). The lights in your house will dim for a moment as the po wer supply charges the capac ...
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Pass Labs 1XA160.5 - page 8
8 XA160.5 Owner’ s Manual pin 3 is inv er ted (negativ e) input. Pin numbers are marked on the XLR. If you re-install the jumper incorrectly or leav e it lying about, the amplifier will not w ork properly , and you will be able to tell. Choose either XLR or RCA inputs . If you r un both at once from different components , the sound is not likely ...
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Pass Labs 1XA160.5 - page 9
9 XA160.5 Owner’ s Manual the temperature ex ceeds 75 deg rees Centigrade. This ther mal cutout should never occur in real life . This is a ver y rare occurrence, and w ould indicate a serious problem. Interconnects and Speaker Ca bles W e have a general recommendation about interconnects , and speaker cables: They should cost less than the ampli ...
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Pass Labs 1XA160.5 - page 10
10 XA160.5 Owner’ s Manual After that, the longevity will de pend upon the n umber of operating ther mal cycles , but we can sa y that we hav e had amplifiers operating in the field in ex cess of 20 years with no par ticular mortality , and we don ’ t hav e g ood infor mation beyond that. More to the point, you should not w or ry about it. T hi ...
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Pass Labs 1XA160.5 - page 11
11 XA160.5 Owner’ s Manual ...
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Pass Labs 1XA160.5 - page 12
12 XA160.5 Owner’ s Manual W ar ranty Infor mation All P ass Laboratories products purchased new from an authorized P ass Laboratories dealer in Nor th America are co vered by a transferable, limited 3-year w ar ranty . This war ranty includes parts and labor charges incur red at the repair facility . Consequential damag es are specifically not c ...
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Pass Labs 1XA160.5 - page 13
13 XA160.5 Owner’ s Manual W ater and moisture: Electrical devices should not be used near water ( as per example , near a bathtub , washbasin, kitc hen sink, laundr y tub , wet basement or swimming pool ). Care should be taken suc h that objects do not hav e the oppor tunity to fall, and that liquid is never spilled onto or into the device enclo ...
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