Find a used Bryston amp..
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The 107 & 107/2 speakers are efficient and easy to drive. I used a Proceed Amp 2 (250 watts into 4 ohms with both channels driven) to drive KEF 107/2s with excellent result. It's a beautiful amp with a separate power supply for each channel. They are switchable between balanced (XLR) and unbalanced (RCA) inputs. You can probably find one used for $500. I have three Amp 2s and an Amp 3 that I'll probably hang on to even though I now use the larger Proceed HPA 2 & 3.
Are you using a KUBE 107? The 102, 107, and 107/2 Reference speakers were designed to be used with their respective KUBEs.
Thanks for the information. No, there is no KUBE, although I don't understand why one would need a subwoofer with these speakers as each one contains a pair of 10 inch woofers and I've certainly never felt they were lacking for bass. Even moderately turned up, you can feel the bass tugging at the back of your pants legs...
Here's an image of the setup we have: http://d1xw7fnq30zy05.cloudfront.net/uploads/image/image/592505/scaled_003.JPG.
Emjaysea wrote, "No, there is no KUBE, although I don't understand why one would need a subwoofer with these speakers as each one contains a pair of 10 inch woofers and I've certainly never felt they were lacking for bass."
The 107 KUBE is not a sub. It's an active equalizer KEF designed instead of a passive R/C network for crossover transitions. According to the KEF manual, it's required for accurate sound. The 107 KUBE also permits tweeking of HF and LF response, but this can be bypassed. I use 107/2 and 102 KUBEs with Jensen transformers to convert from balanced to unbalanced to go through the KUBEs. I bypass the tweeks.
Ah, it looks like this is the kube then: http://3.bp.blogspot.com/-RYbR3kTlEQ0/TV3NQ46xDnI/AAAAAAAAATg/-IoYXjc3Fg8/s1600/KEF+KUBE+107+Universal+Bass+Equalizer+for+KEF+107+Reference+Speakers+.jpg Yes, we have one of those.