my 1400h could barely get any bass out of my Q750's, my Q100 actually had stronger/deeper bass paired with my 1400h. When i upgraded to my 4500h the difference was drastic.
both the Q750/Q950 dip into the 3-4 ohm frequently and require a receiver that can handle 3-4 ohms with ease. Even with my bas-xA300 the fans kick on within 15 minutes (most people say their fans never come on)
I recommend you eventually get a stronger receiver that has plenty of dynamic power @ 4 ohm (200-300w) preferably.
Speakers: KEF Q100, Q300, Q750, Q650C, Q50a / Fluance Signature Series/ DCM TP160S-CH Subwoofers: Outlaw Ultra X12 (x2) / BIC H100-IIReceiver: Denon AVR-X4500H, AVR-X1400H Integrated Amplifier: Yamaha A-S501/ Fosi Audio TPA3116 mini amp Extras: MiniDSP Umik-1 Amplifier: Emotiva BasX-A300 Next Speakers: Triangle BR03, Revel Concerta2 M16, Dynaudio Emit M20, Buchardt S400, Triangle Comet ez, KEF R3