AB Amps 6600A Quick Manual

              MODEL 6600A 

                  SIX CHANNEL 

                 AMPLIFIER 

The Amplified Design International Professional 

Series Model 6600A is a six channel full 

featured Amplifier. This compact instrument 

(four rack unit) is equipped with three individual 

power supplies, six independent balanced and 

unbalanced inputs, detent level controls, signal 

presence and “Soft Clip” indication, dual 

temperature activated fan assist, Stereo/Bridge 

switches per each two channels. The 6600A 

delivers 400 Watts into 8 Ohms, 600 Watts into 

4 Ohms and 750 Watts into 2 Ohms all six 

channels driven from 20Hz to 20kHz at less than 

.1% distortion (typically 0.01%). Model 6600A 

incorporates a three-year, Five Star protection 

plan featuring the following unprecedented 

circuitry. VI energy limiters are incorporated for 

short circuit protection. If an extreme low 

impedance exists on any channel, a current 

sensing circuit will reduce the output to prevent 

amplifier overdrive. 

If an abnormally high AC line voltage is present 

or an excessive voltage surge appears, the 

amplifier will detect the situation and turn itself 

off. If an unlikely DC situation occurs, DC 

sensing circuits will trigger the amplifier channel 

and turn off. Thermal sensors are installed in 

each channel to protect against an over 

temperature condition. “Soft Clip” circuitry has 

been incorporated for added protection to 

prevent hard clipping from improper use. A rear 

panel selectable 80Hz Linkwitz Riley fourth 

order Lo-Pass filter switch has been added to 

channel six for subwoofer applications. Other 

features included are internal selectable input 

sensitivity, ground lift switch and fully modular 

design for service accessibility. Remote turn on 

is available as an option. The Model 6600A will 

operate from 100/240V 50-60Hz AC Mains and 

measures 7” high (four rack unit), 19” wide and 

16 1/2” deep.