I have a problem with my Tannoy F4 customs. They are supposed to be really warm sounding and capable of deep rich bass, however I've never in 4 years of ownership found the sound to be warm or at all bassy. I've checked the bass response and although they do go down to their stated 35hz, the volume only reaches the correct volume at 100hz and over, so something must be up. I originally had a Sony str-dg910 hooked up to my F4s and always hated the sound (too bright). I thought it was the room, then I moved (not just for the acoustics), but it was still rubbish sounding albeit slightly improved. So I then decided it must be the amp, so I bought a Yamaha rxa1010 because I thought a "warm" amp would finally give me the sound I always craved. Still nothing, I might as well have bought a Pioneer! So it must be the speakers. I've opened them up and the wiring/crossover all checks out. I've heard that there might be a wiring issue with the crossover perhaps, or the woofers themselves have the + and - in the wrong places (thus they look fine but are actually wrong). However, I've checked the polarity with a battery and it all checks out (both cones move out together as they should). It's also weird that they both sound the same, or are speakers built in pairs to insure they sound the same (i.e drives coming from the same production batches?) Any help would be appreciated.