McIntosh MA6800

An integrated amplifier developed to provide the same quality as a separate amplifier, featuring three elements of G.T.L: a glass panel, an output transformer, and a panel light. Equipped with an output transformer, it delivers consistent high power for 8, 4, and 2-ohm loads and can stably supply a peak output current of 53 A or more with extremely low distortion at frequencies far beyond the audible range. The transformer also protects the speakers by preventing DC current from flowing in the event of an emergency. The signal system from the phono input to the final stage is essentially the same as that of the Macintosh separate amplifier. To add the advantages of an integrated design, the signal path has been thoroughly shortened, and internal interference and distortion have been carefully eliminated. In addition to the strict electromagnetic shielding of the power transformer, the layout of the printed circuit board and cables has been thoroughly examined. The signal switches of the logic control are all glass-sealed reed relays. The tone control circuit is completely bypassed in the flat position. The infrared remote control allows you to perform all major operations at hand. The position of the master volume is digitally indicated by the LED indicator in the center of the panel, the LISTEN and RECORD signals can be selected independently, and the optional video and speaker selectors can be controlled. It is equipped with a protection circuit unique to Macintosh that includes Route 6 features such as Power Guard and Centrino monitor. Equipped with a power meter that displays the output power of voltage x current with a response speed approximately 10 times faster than that of a commercial VU meter. A cable with a 6 mm core wire diameter can be connected directly to the speaker output terminal. The output terminal of the preamp section and the input terminal of the power amplifier section are mounted and can be used separately. Equipped with Macintosh's own continuous loudness control, it is possible to correct the loudness regardless of the volume position.

Type Stereo integrated amplifier Rated Output (Both Channels Operating) 150W + 150W (2, 4, 8 ohm, sine wave continuous output) Load impedance 2, 4, 8 ohm (Independent Terminal) Output frequency bandwidth 20 Hz to 20 kHz Total harmonic distortion factor 0.005% or Less (20 Hz to 20 kHz, 250 mW to 150W, Both Channel Operation) Intermodulation distortion factor (both channel operation) 0.005% or Less (250 mW to 150W at any combination of 20 Hz to 20 kHz) Frequency characteristic 20 Hz - 20 kHz + 0 -0.5 dB Signal-to-noise ratio (IHF-A network) Power Amplifier : 110 dB (Rated Output) Preamplifier : 90 dB (10 mV input, 84 dB IHF) High level : 100 dB (rated output, 90 dB IHF) IHF dynamic headroom 1.8dB Damping factor 40 or more Power Guard Overdrive at 1 kHz up to 14 dB THD within 2% Input impedance Phono : 47k ohm (65 pF) High Level : 22k ohm Power amplifier in : 20k ohm Input sensitivity Phono : 2.5 mV (0.5 mV IHF at rated output) High Level : 250 mV (40 mV IHF at rated output) Power amp in : 1.4 V (at rated output) Maximum input level Phono:90mV High Level:10V Tone control Up to 12 db boost / 12 db cut for Bass/Treble Pwer 100 VAC, 50Hz/60Hz, 6.25A (UL/CSA1) External dimensions Width 445x Height 179x Depth 537 mm (including knob) Weight 31.8kg