Hafler HA75 User manual - page 3
HA75 'TUBE HEAD' HEADPHONE AMP
Hafler
1
WARnInG
HIGH PoWeR AmPLIFIeR
The powerful amplifier inside the HA75 is designed to accommodate
all types of headphones from 8Ω to 400Ω. As we have no way of
determining the headphone impedance, the amplifier is very loud.
Exposure to high sound pressure levels for an extended period of
time can cause irreparable ear damage. Please consult your local
health authority to ensure you do not expose yourself beyond
recommended limits. Radial shall not be held responsible for
using the HA75 without due care or beyond recommended legal
limits imposed by your local government. Use by children is not
recommended and therefore must be carefully monitored by parents
or guardians.
oVeRVIeW
The Hafler HA75 uses a 12AX7 tube as part of the signal amplification.
Tubes are preferred by audio enthusiasts and recording engineers for
their smooth, natural sound. The HA75 tube sound will reduce ear fatigue
compared to typical solid-state counterparts.
The HA75 is also able to generate tons of power. Unfortunately, this
opens the door to potential risks that you must be aware of. The high
output tube amplifier is intended for use by recording professionals to
enable them to monitor dynamics without constraint when using a wide
range of headphones of varying impedances. This means that non-
professional home users must take special care to prevent excessive
exposure over a long period of time. You should therefore consult your
local health authority for details on allowable exposure limits in order to
prevent damage to your hearing. This is particularly important when using
ear-buds as these are designed to accommodate low output amplifiers,
which means they can be very loud with very little output power.