Pass Labs XP-20 Analog Preamplifier - 2 Chassis - Complete
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Pass Labs XP-20 Analog Preamplifier - 2 Chassis - Complete
SkyFi 479
479 South Broad Street
Glen Rock NJ 07452
United States
Very capable XP-20 two chassis preamp from Pass Labs. Super neutral and transparent sounding just like most Pass gear. You'll have a hard time detecting this in your system.
This listing is for a complete set including all documentation, remote, power cord, and packing materials.
Serial numbers:
32069 / 32070
More from Pass:
With a separate power supply electrically isolating delicate analogue signals in the preamplifier, this cosmetically-matched dual-chassis reference line-stage preamplifier offers significant gains in detail retrieval over the XP-10 without loss of musical soul.
How does this translate into the sonic fidelity you really care about?
Instruments and voice are presented in a more refined soundstage, and with better spectral balance. Fine nuances and details, which frequently go un-noticed, now become beautifully apparent -- even in loud and highly complex musical passages.
Owners Manual:
https://www.passlabs.com/wp-content/uploads/2020/01/xp-20_om.pdf
Spec Sheet:
https://www.passlabs.com/wp-content/uploads/2020/01/xp-pre_specs_0.pdf
Recommended Cables:
Kimber Kable - RCA Interconnects - Better
Kimber Kable - RCA Interconnects - Best
Kimber Kable - BALANCED XLR Connectors - Better
Kimber Kable - BALANCED XLR Connectors - Best
Kimber Kable - Power Cords - Better
Kimber Kable - Power Cords - Best
The SkyFi Testing Process for Preamplifiers:
We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCB’s for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.
When we first power on a preamplifier we connect its RCA output to a Sencore PA81 Power Analyzer which simulates real world loading conditions and gives us an oscilloscope interface. The first order of business is checking that the volume control works smoothly throughout its entire range with acceptable channel balance. This is accomplished by feeding a 1KHz sine wave into one of the preamp’s line level inputs while monitoring the preamp’s output on an oscilloscope. We then switch to a 1KHz square wave to test the tone controls, loudness function, and filters where applicable. During this step we are watching for equal alteration of the test signal by both channels. This also helps us identify dirty controls that will need treatment. Once the basic line stage functions are verified, we test each input individually. This is especially important for devices that use relays to select their sources. If the preamp is equipped with a phono stage we test that as well. We use an inverse RIAA filter which allows us to feed a reference test signal into the phono input with the proper RIAA equalization and level. A square wave or sine sweep is used to verify that the device’s phono stage is faithfully reproducing the RIAA curve. If the preamp under test has balanced inputs and/or outputs these are tested as well.
We finish up our bench testing with a listening test with our bench amplifier and reference speakers. During this test we check for hum or hiss that may not have shown up in earlier testing. We also check that all of the tone controls and filters perform as expected. If the preamplifier has remote control functions these are also tested. Preamps with tube circuits or complicated power supply topologies are connected at our long term test rig for extended stress testing under real world conditions.
Item |
Included |
Original Box |
Yes Included |
Manual |
Yes Included |
Remote |
Yes Included |
Cables |
Yes - Power and Umbilical |
Physical Condition (Info Here) |
8 / 10 |
Working Condition |
10 / 10 |
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