Get a Yamaha RX-A3020 and you won't need external amps to drive your Def Techs. Its one of the few receivers coming close to doubling its output into 4 ohms. Its predecessor, the RX-A3000 I believe is the only AVR tested by Audioholics that has come close to doubling its output.
Yamaha RX-A3000 Aventage 11.2 Networking A/V Receiver Review | Audioholics
From the review....
"The Yamaha RX-A3000 handedly exceeded its 140wpc power rating continuously with two channels driven and stomped out an impressive 236wpc both channels driven into 4 ohms; and that’s a full power bandwidth measurement (20Hz to 20kHz at 0.1% THD + N). It proved to be every bit as powerful as their more expensive RX-Z7 mode. You can see the protection circuit kick on during our ACD tests, purposely limiting power to 65wpc. In short time, there is no doubt in my mind forum lurkers seeing this will pop up on our site or AVS Forum bashing Yamaha, not realizing the design purpose of power limiting a multi channel amplifier in a compact chassis, or the reality that real world program material will never trip this limiter circuitry. Thus we conducted dynamic burst power measurements simulating real world program content. Interestingly enough the RX-A3000 delivered similar dynamic power output ACD into 8 ohm loads and slightly more power two channels driven into 4 ohm loads than the
Emotiva UPA-7 dedicated multi-channel power amplifier that is designed to deliver rated power continuously into all channels as can be seen in the comparison table below.....
It's clear that the Yamaha RX-A3000 delivers more than rated power with up to two channels driven and tons of dynamic headroom (1.9dB for 8 ohms based on their 140wpc power rating). Let no skeptic tell you otherwise, the RX-A3000 has a darn respectable amplifier section not only for a receiver but for a modestly priced seven channel power amplifier."
