I’m a bit concerned about some of the claims said to have been made by Naim staff during factory visits.
Last week there was the assertion that a Statement system consumes £600 worth of electricity quiescent consumption if left on. Ignoring the fact that the existence of a standby mode using only about £1 PA had been overlooked, by my calcs based on a typical electricity cost of 13p/unit in the UK, a stereo Statement system according to published specs would only consume about half the declared amount - so either the claim was wrong or the published specs are wrong.
Now this claim of 9000W/pS. Expressed in typical units for amplifier measurement, this equates to 268 000 000V/μS (or in different terms, power can rise from zero to 9000W in 1/50 000 000th of one cycle of the highest frequency sound a human can hear - indeed, that would be superlative performance in a microwave transmitter amp!). That is an incredible rise time, and whilst I am not in a position to say it is not posssible, I do have to wonder if the unit# may hav3 got mixd up somewhere...
I do think that if there are exaggerations being made by Naim staff, or mishearings by visitors, they should be addressed in order not to mislead, in either direction - and should my scepticism regarding the slew rate be unjustified I wholeheartedly apologise. Perhaps Naim could step in here for the record on these points. ( @Phil Harris
Taking the queries raised I thought I'd get the answers directly from R&D...
Zero to 9kW...
We’ve said 9kW in a millionth of a second but it’s nothing like 9kW in a picosecond. It’s a factor of a million times incorrect … so someone has misheard and then reinterpreted in picoseconds instead of microseconds.
[My note : This could have been someone here that has mistaken this and given it as information I guess - I'll make sure that the sales guys have this pointed out to them.]
To achieve 9kW into 1ohm the output needs to rise to 94V peak into a 1ohm load - it can supply 100A into 1ohm for short durations. The slew rate of the amplifier itself is >300V/uS or in other words the output speed is the same as going from 0 volts to 300 volts in a millionth of a second.
If we simplify we can say the output needs to go to 100V,
The output can respond at a slew rate greater than 300V in 1 millionth of a second,
Therefore to go to 100V takes 1/3rd of a millionth of a second,
Therefore the Statement will do 0 to 9kW in less than a millionth of a second.
(This is on a test bench under test conditions.)
Statement is 0.3W per box in standby i.e. 1/3W for each amp and 1/3W for the pre-amp so 0.9W for the complete statement amplifier. So at £0.13 per unit of electricity it will cost £1/year to run.
With the amplifier left on full time it will take 55W + 100W + 100W for the pre-amp and power amps respectively, so at £0.13 per unit of electricity it will cost £290 per year to run.
[My note : Obviously if you live in a cold climate this can be off-set towards the heating bill ]