Hi, I have just been reading through one of the very helpful topics on here re speaker and crossover settings which has helped clarify some things for me (I'm a newbie that's just bought a new surround sound setup), but there were a couple bits I am still unsure about so wondered if someone might be able to advise me. I have a Yamaha RX-V671 Receiver, KEF HT1505 Surround Kit (which consists of the C4 Subwoofer and HTS7001 satellite speakers). I have replaced the front 2 of these satellites with 2 Mordaunt Short Aviano 6 Floor standing speakers. Here are the specs for each of these 3 speaker types: Mordaunt-Short Aviano 6 Floor Standing Speakers (Fronts) Frequency response: 38Hz - 22kHz Sensitivity: 88db KEF Sub (C4) (Centre and Left / Right Surrounds) Frequency Range: 29Hz - 140Hz Maximum Output: 108dB Low Pass Filter: Variable 40Hz - 140Hz, 4th-order KEF Satellites (HTS7001) Frequency response (+/- 3dB): 120Hz - 22kHz Crossover Frequency: 2.8kHz Sensitivity: 85dB Maximum output (SPL): 106dB Based on the article I was reading on here, I figured out that if it wasn't for the 2 Aviano 6 front speakers, I should be setting my crossover to 120Hz - 140Hz. However, because the Aviano's have a range of 38-22000 Hz, I wasn't sure how this should affect the ideal crossover range - should it remain 120Hz - 140Hz? I originally had the Aviano's set as 'Large' in my Receiver settings but after reading the article on here, I think that was a mistake - can someone please confirm that 38-22000 Hz is classified as 'Small'? Finally, there are settings for crossover on the rear of the KEF C4 sub, which the instruction leaflet that came with the KEF kit, said I should set to 140Hz. Is this just saying that 140Hz is the highest frequency that the sub should handle (and is correct to be set at this maximum frequency)? Thanks for any advice & clarification on this.