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WARNING

Water and moisture:

  This device should not be used near water ( as per example, near a bath-

tub, washbasin, kitchen sink, laundry tub, wet basement or swimming pool ).  Care should be 
taken such that objects do not have the opportunity to fall, and that liquid is never spilled onto 
or into the device enclosure through openings.

Power Sources:

  This device must  be connected to a mains power source in strict accordance 

with the supplied  product owners manual.  Please verify that the AC mains voltage specifi ed 
in the product manual matches those requirements indicated on the unit and the AC volt-
age provided to your location by the power company. The product MUST be connected to a 
MAINS socket outlet with a protective earthing connection.

Power Cords:

  Pass Labs provides a power supply cord that meets all legislated requirements 

for the market in which the product was originally sold.  If you choose to substitute an af-
ter-market product we urge you to choose one that is fully safety rated by the necessary local 
authority.

Power supply cords should be routed so that they are not likely to be walked on, abraded, or 
pinched by items placed on or against them, paying particular attention to cords where they 
enter plugs or exit from a device.  Never under any circumstance insert a cut or damaged 
power cord into a mains power socket. Cables should never be connected / disconnected 
with equipment powered up.  Failure to heed this warning may damage or destroy equip-
ment.

Ventilation:

  Power-amplifi ers run warm, but you should be able to place your hands on them 

without discomfort.  You must allow for this heat in installation, by providing for free air circula-
tion around the product.  Leave a minimum of 6” of space around the amplifi er. The ventila-
tion should not be impeded by covering the ventilation openings with items, such as newspa-
pers, table-cloths, curtains, etc.

Other Warnings:

No naked fl ame sources, such as lighted candles, should be placed on the apparatus; This 
amplifi er is suitable for tropical climates under 2000m and ambient temperatures of 40 degrees 
C or less.

Servicing:

  To reduce the risk of fi re, electrical shock or other injuries, the user should not at-

tempt to service the device beyond that which is described in the operating instructions.  All 
other servicing must be referred to qualifi ed service personnel.

For Units With Externally Accessible Fuse Receptacle:

 Unplug the device from all sources of 

power before changing  or inspecting any fuse.  Replace fuse with one of same physical size, 
type and rating as that specifi ed by the manufacturer for that product.

Country Specifi c Warnings:

China: For use at altitude 2000m or lower.
Norway: Apparatet må tilkoples jordet stikkontakt.
Sweden: Apparaten skall anslutas till jordat uttag.
Finland: Laite on liitettävä suojakoskettimilla varustettuun pistorasiaan.
Denmark: Apparatets stikprop skal tilsluttes en stikkontakt med jord, som giver forbindelse til 
stikproppens jord.

Trademarks: 

“Pass”, “

pass

”, “Pass Labs”, “Pass Laboratories”, Supersymmetery”, 

“Aleph”, and “Zen” and are all registered trademarks of Pass Laboratories, Inc., and 
all rights thereto are protected by law.

Summary of Contents for HPA-1

Page 1: ...1 pass HPA 1 Owner s Manual ...

Page 2: ...stroy equip ment Ventilation Power amplifiers run warm but you should be able to place your hands on them without discomfort You must allow for this heat in installation by providing for free air circula tion around the product Leave a minimum of 6 of space around the amplifier The ventila tion should not be impeded by covering the ventilation openings with items such as newspa pers table cloths cur...

Page 3: ...overlooked and plays a large part in overall performance of the amplifier The HPA 1 s amplifier circuits are low feedback wide bandwidth discreet designs employing a J Fet input stage and a Mosfet output stage biased into Class A biased direct coupled output stage The HPA 1 easily drives headphones presenting loads from 15 to 600 Ohms particularly excelling on planar headphone designs The sound is r...

Page 4: ...formance after about one hour after turn on In the event of a power loss the unit shuts off and upon restoration of power the unit will go through the mute cycle and return to the state it was in prior to the loss of power It will remember the last input and function and will return to that setting before the loss of power This is also true when the unit is switched off with the power switch It is...

Page 5: ...in the best possible signal integrity between the headphone amp circuit and the headphones The silver contacts are rated to reliably carry 10A of current without overheating and are largely self cleaning If there is a better sounding and more trouble free 1 4 audio jack we ve yet to experience it In use the locking mechanism is automatic in action and requires little or no additional insertion for...

Page 6: ...y characteristics will differ slightly due to the different metallurgy of the fuse elements between commercial grade and audio grade fuses We can t guarantee that your audiophile grade fuse won t blow at a different in rush current threshold than your stock commercial fuse Use of other than approved fuses may invalidate your product warranty and result in product damage HPA 1 Specs Gain 8 dB Frequ...

Page 7: ...factory or shipping product to the factory for repair Non North American product must be returned to the country of origin for warranty service Foreign distributors are only required to offer warranty service on Pass Laboratories product that they have imported verifiable by serial number Please note Conditions of warranty service and customer rights for product purchased outside the United States ...

Page 8: ...8 pass Pass Laboratories Inc 13395 New Airport Rd Suite G Auburn CA 95602 530 878 5350 passlabs com ...

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