Hi all,

To the best of my knowledge, almost all amplifiers' specification used to
state the Bandwidth to be on the average 20hz to 20khz. There were some,
such as Chord and a number of tube/valve amplifier with rated full power
bandwidth upto 100khz. Lately, i.e after SACD and DVD -A many amplifer now
state bandwidth up to 100Khz.

My question, did any significant design or circuit changed to meet the above
20khz in the last 5 years or is it mere renumbering in the specs?

The same happened in the frequency response specs. It used to be 40 or more
to 20KHz. Now all of sudden the speaker manufacturers are promoting speakers
meeting the new formats reqirements and stating max upto 35khz and more.
Renumbering or redesign?

Over to you guys...