Isn't the BEL a 50W amplifier? I am going by memory here but, I believe the Sound Lab impedance curve ramps up quite a bit with frequency (or maybe it is with lowering frequency). In either case, a 50W amp may run out of voltage (therefore power) since these amplifiers are generally rated at 8 ohms output impedance. In other words, a 50 watt amp at 8 ohms may only output 25 watts at 16 ohms. It is the rising characteristic that can bite you however, this is likely to only be a problem if the rising impedance is with lowering frequency.
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