The non-linear byproducts ( distortion ) of a Bryston 4B take off like crazy above 2 KHz as documented in IAR 4. Moncrieff also documents that the 4B is load sensitive i.e. it changes tonal balance as the impedance varies. His findings are that the amp will sound brighter as the impedance rises. As such, i would avoid hooking this amp up to any speaker with metal domes, speakers that had a bright top end, speakers that were 8 ohms or higher or a system that made use of a mass produced digital front end ( cheap cd or dvd players ). As such, it might be a good match for a 4 - 6 ohm speaker with a medium sized woofer and a soft dome tweeter but anything else would tend to show the flaws in the design and possibly even highlight them. The newer Bryston's might be better sounding amps, but as far as i can tell, they still have problems driving very low impedance loads. Sean
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