1. it amazes me how the digital era of audio appears to be going, I saw a
report recently of a new Logitech speaker that was getting rave reviews
saying "it has no distortion at all" reading the reviews it became clear
they where refering to be able to play at max vol with an ipod as the input
without it distorting....a look at logitech.com found me the spec 20wrms @
10%thd ! sheesh! that got me wondering too about the mp3 source, compared to
the orig CD wav what wouth the thd of the mp3 work out at ? can it be
measured ?


2. a few yrs back I got samples from Analog Devices of a low noise audio
switch and a dc controlled vol chip ( 0.002% thd ) I knocked them together
with a couple of 5532's and have been enjoying them since ( from tv/dvd or
Technics CD into 4 x 75wrms mosfet amps and onto a pair of ILP TL4's,
ground/door and window shaking stuff and very clear, or so I thought.....
last week I got hold of samples of National's LM4562 and replaced the
5532's, the attack on drums is now much better and everything sounds
tighter. As it was chucked together I used 7815 & 7915 regs, I had a trouble
with rf on the -ve rail which could be heard as a faint hiss, so I thought
whilst it's in bits I'll go over the power supply , no need! it's now
silent, better rejection ? anyone else tried these LM4562's ?

Pete