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Hartke AC75 and AC150 Acoustic Amplifier Features
The Hartke AC75 and AC150 Acoustic Ribbon series amplifiers employ the most advanced elec-
tronic and speaker design concepts in acoustic instrument amplification. Here are some of their
main features:
• The Acoustic Ribbon amplifiers and internal speaker systems have been matched to produce
a linear and controlled frequency response via the custom-designed, 5-inch full-range drivers
and unique high frequency ribbon transducers.
• The Acoustic Ribbon series feature a custom designed, planar ribbon high frequency trans-
ducer set on a precision formed waveguide providing linear output of the high-frequency
range. The results are immediately apparent; a sweet and natural top-end response without
the resonant distortion that's common in other standard tweeters. The AC75 employs a 2 x
4-inch ribbon on a 5 x 7 waveguide, while the AC150 has a 2 x 4-inch ribbon on a 7 x 7 wave-
guide.
• Both Acoustic Ribbon models offer ample power. The AC75, with 75 watts in a bi-amped con-
figuration delivering 50 watts for the full range speakers and 25 watts for the ribbon tweeter.
The AC150 has a total of 150 watts of power with 2 times 50 watts for the left and right pairs
of 5-inch drivers, plus 50 watts for the ribbon.
• The Acoustic Ribbon series amplifiers feature dual Input Channel configuration with Active
and Piezo inputs on Channel 1 and XLR mic and RCA line inputs on Channel 2.
• You can add a splash of delay and chorus or gallons of lush reverb to either input channel
using one of the Acoustic Ribbon's 100 on-board, 24-bit digital effects. The effects section
includes a SELECT control with a bright, dual seven-segment LED display to dial up the effects
presets, plus a LEVEL control to adjust the amount of effects you want to hear.
• The Acoustic Ribbon amps give you a lot of control for your acoustic instrument rig. Channel
1 has GAIN, BASS and TREBLE controls, an EFX IN/OUT switch for adding effects, plus a PHASE
switch to help eliminate feedback. Channel 2 offers a GAIN control plus an EFX IN/OUT switch
for adding effects.
• A useful Notch Filter with FREQUENCY and DEPTH controls helps eliminate feedback by allow-
ing you to dial out the resonant frequency.
• When the PHASE switch is engaged, the input polarity is reversed so that the instrument and
speaker system will not be in Phase and the chance of feedback is reduced.
• To adjust the overall system tonal response, the Acoustic Ribbon series provide a 5-band
Graphic Equalizer with 12 dB of cut and boost at 100Hz, 315Hz, 1kHz, 3.5kHz and 10kHz.
• The Acoustic Ribbon series amplifiers have a rear panel Effects Loop for using external signal
processors plus a Direct Output making it easy to interface with the main PA system.
• The Acoustic Ribbon series amplifier cabinets are solidly built with rugged plywood construc-
tion, precision tuning and Hartke's world-famous, trademarked Kickback™ enclosure.
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