Fant dette på Naimforumet. Alltid interessant å lese JV's forklaringer og svar.
Date: 17-Mar-98 14:59
Author: julian vereker
Subject: pre-amps
...
The pre-amp bandwidth and rise time define the operating envelope of the power amp. Most every other manufacturer's pre-amps are designed to drive their power amps - not Naim ones - for obvious reasons. We go to very great lengths to match the two parts of the system, unfortunately most of the other pre-amps (particularly those of US design) have wide or very wide bandwidths (DC to Light...) these are TOTALY unsuitable for use with our power amps if you are interested in music rather than appearance, features, RCA sockets or Lemos.
julian
quote:
Date: 2-Mar-99 15:48
Author: julian vereker
Subject: clarification
Bruce said:
Julian: I'm wondering what you mean by 'within an order of magnitude of our delivered performance envelope." How are you defining your performance envelope? For example, it is relatively simple to extend the band-width of your amplifiers by an order of magnitude.
***** jv: delivering a certain levels of distortion within bandwith/dynamic range/power output parameters. So your suggestion of widening the bandwidth is 'outside the envelope', and in any event it is not a helpful way to go since this makes all the 'stability housekeeping' much more difficult and some of the 'Naim ratios' impossible to maintain.****
Bruce: And such a modification mates well, i.e. produces more music, with some other components.
**** jv: this is somewhat contentious.
Bruce: You will likely argue that this is not the case if a Naim preamplifier is used and I accept that until I hear otherwise. But then I don't see how you can define your performance envelope for your amplifier alone. (I realize of course that what you were talking about was a complete grounds-up attempted copy of your amp.)
**** jv: I'm talking bench testing.
Bruce: Another question I've wanted to ask you. You are rightfully proud that your electronics are basically unchanged for the past 25 years or so. It's a pretty remarkable fact and speaks volumes about this crazy industry, something you know much better than I do. But, if you were starting fresh NOW to design and prototype some audio electronics, with the goal of the very best possible system, would you use the same technology you began with in 1972? Would you not take advantage in some way of the much higher speed components that are available today?
**** jv: what higher speed components? There are many higher speed devices about (as there were in 1970), but speed is not all.
I am sure I've said it before, but I will say it again - It doesn't matter how good the best bits are, only how bad the worst bit is.
julian
