In article ,
dxAce wrote:

Telamon wrote:

In article ,
"David Eduardo" wrote:

"Telamon" wrote in message

...
In article ,
"David Eduardo" wrote:

"Telamon" wrote in message
.
com.
..
market.

The NRSC research, headed by none other than Bob Orban, proved that
a
bandwidth of up to around 6 kHz was ideal given today's receivers,
and
anything more caused deterioration in the audio. The NRSC used a
large
sample of average listeners using a variety of consumer radios.

Now that's baloney. The analog frequency response has been limited
so
they can broadcast the crap IBOC signal. They don't sound as good
any
time day or night because of this and I find it hard to believe
there
is
no fading distortion in the metro LA area. They really sound
terrible
when this happens.


The NRSC papers are searchable, and the evidence is quite convincing.
In
fact, bandwidth much over 6.5 kHz actually makes most receivers sound
worse... the ideal being around 5.5 kHz to 6.5 kHz.

Yeah, with the IBOC on that's true but with just the analog signal it's
not. I have the luxury of knowing since I have a receiver that will go
out to 16KHz.

The NRSC study had nothing to do with HD... it was based on finding the
optimal bandwidth for AM with today's environment and today's receivers
in
analog mode. The feeling had been that the NRSC 10 kHz standard was,
indeed,
too wide for the best sounding AM operation... and they were right.

Well, in my own tests I'd say about 8KHz is best. This what I use most
of the time for BCBAM and SW.

I've got an 8 kHz filter in my R7.


What do you think Ace? If you are just program listening on a good
signal 8 KHz is where I keep it on the RX340. On the Drake I use the
widest 6 kHz with the passband at 3:00 or 9:00 O'clock and on the
AOR7030+ I'll use the 7 kHz filter with the passband at about 3 kHz.

--
Telamon
Ventura, California