Need your recommendation on a 5 or 7 channel amp

Thoughts on the 1827 versus 4000 series?

Likely current capability.  The AT182x series uses smaller power supply capacitor banks and I don't think it's a fully balanced/differential amp (it's a single-ended amp board instead).

AT1820: 22,400uf power supply capacitance per channel, 4 output transistors per channel

AT4000: 46,200uf power supply capacitance per channel, 12 output transistors per channel

AT6000: 59,400uf power supply capacitance per channel, 16 output transistors per channel

In laymens terms, the transistors are what generate the output voltage/current required to drive the speaker.

The AT4000, being a fully balanced/differential design, will have a stronger control over the speaker drivers and likely have more punch/drive when compared to AT1820.  The bigger power supply of AT4000 will result in stronger bass/midbass and also smoother audio through the rest of the frequency range.  That being said, the AT1820 series is likely still better than the Savoy G4.

I can get a pretty good deal on the ATI4027 @ $3960 and the ATI1827 @ $2400, but with out previewing either one which would you prefer? Sonically will I really hear the difference between these and with a $1,560 price difference do you really think it's worth it, or should I entertain an ATI 4023 for the front 3 speakers and an ATI 1824 for the rears and Atmos speakers predicated the cost is the same as the above configuration as the ATI 4027? Buying with out previewing is my biggest concern. Thanks!!

Ordered ATI 4007 amp. Will let you know when I receive and how it works in my home theater. Still waiting on the Marantz AV 7706 processor - think it comes in end of November. Thanks again for your input !!

Bryston 9BST