get in touch with Arne Roatcap of Goldpoint, give hime the sensitivity figures of your amp and speakers and he will build you a custom attenuator. Use it as a passive or substitute for whatever is in your pre-amp. There are also a ton of posts on the Bottlehead forum on this very subject because of the high output of the original Foreplay pre-amp. Paul Joppa has written extensively about using resistors 'tween pre-amp and amp to attenuate the source output. Check it out.