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Right now I am considering the NuForce amps and a Butler 3150. The Butler is not digital, but has a tubed output stage and is supposed to be very smooth (non-fatiguing). ...

...As WerTicus said, anyone can use a linear power supply to upgrade Ref 8 for higher power and it is easy to do. But then you're stuck with some ugly transformer and by the time you're done, you probably spend too much time on it to be worth the effort. And you can't stack them nicely for multichannel setup or bring it to your friends house to show off

We know that Current hungry speakers (Apogee) will not be a good match for Ref 8 due to its SMPS Current limit of 2.1A. The amp's power can be estimated with V square / 2*load but SMPS will current limit even though it seems that there is enough power if you rely on voltage for power calculation. To address this problem, we put in a 350W RMS SMPS in Ref 9 with voltage limit at 52V and current limit at 7.3A. QuoteJasonI have Quad 989 speakers. They have sensitivity of about 87db but are not easy loads due to their impedance curve which I understand drops well below 8 ohms. I am planning on auditioning a pair of 8Bs. 100 watts is enough for 87db (my current amps - Aleph 2s - are 100 wpc) but I'm not sure how "current hungry" the 989s are. You have to forgive my technical ignorance but does a difficult load in terms of impedance equate to being current hungry and might, therefore, the 8Bs be a bad match for my 989s and other such "difficult loads" ?BTW the Alephs are great amps and I will be very impressed if the 8Bs can better them!

JasonI have Quad 989 speakers. They have sensitivity of about 87db but are not easy loads due to their impedance curve which I understand drops well below 8 ohms. I am planning on auditioning a pair of 8Bs. 100 watts is enough for 87db (my current amps - Aleph 2s - are 100 wpc) but I'm not sure how "current hungry" the 989s are. You have to forgive my technical ignorance but does a difficult load in terms of impedance equate to being current hungry and might, therefore, the 8Bs be a bad match for my 989s and other such "difficult loads" ?BTW the Alephs are great amps and I will be very impressed if the 8Bs can better them!

Just for my clarification, does current hungry equate to low impedance?