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Pass Labs Amplifier manual

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Table of contents for the manual

  • Page 1

    1 pass ® XA30.5 Owner’ s Man ual May 17, 2007[...]

  • Page 2

    2 XA30.5 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 [...]

  • Page 3

    3 XA30.5 Owner’ s Manual W e star t with simple FET circuits already ha ving low distortion 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 t[...]

  • Page 4

    4 XA30.5 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 he[...]

  • Page 5

    5 XA30.5 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 tan[...]

  • Page 6

    6 XA30.5 Owner’ s Manual The amplifier’ s voltage and cur rent rating are indicated on the rear panel. It will be either 230 v olts, 115 v olts or 100 volts . T he larger amplifiers have a circuit break er of the appropriate capacity . The smaller power amplifiers use a slo w-blow 3A G type fuse . T he frequency rating of the A C line source is[...]

  • Page 7

    7 XA30.5 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 capaci[...]

  • Page 8

    8 XA30.5 Owner’ s Manual 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 to be optimal, but it shouldn ’ t cause damag e anywhere . Now that [...]

  • Page 9

    9 XA30.5 Owner’ s Manual 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 hav e a g eneral recommendation about interconnects , and speaker cables: They should cost less than the amplifier , and contain at least some conductiv e material. W e hav e trie[...]

  • Page 10

    10 XA30.5 Owner’ s Manual 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 his is a conser vati vely built industrial design, not a frail tube circ[...]

  • Page 11

    11 XA30.5 Owner’ s Manual XA30.5 SPECIFICA TIONS Obtained after 1 hour war m-up , with regulated 115 V A C pow er line. Gain 26 dB Freq. R esponse -3 dB at 1.5 Hz, -2 dB at 100 kHz P ow er Output P ow er Output P ow er Output 30 watts @ 8 ohms , 60 watts @ 4 ohms Distortion @ 1 KHz .01% @ 3 W , .1% @ 30 W Maximum Output V oltag e +/- 30 v olts Ma[...]

  • Page 12

    12 XA30.5 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 co[...]

  • Page 13

    13 XA30.5 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 enclos[...]