There is a special synergy between the Quads & ARC amps - the older ones not the VT100. The Quad's are not easy to drive correctly since their impedance curve starts off above 30 ohms down low and dips down to ~2 ohms at the top end. Use the 16 ohm tap from either a D115 or D70 and you'll have no problems with wieght or volume. I think most people who complain about the Quads have never heard them properly driven.
