[Scott Dorsey]

geoff wrote:
On 8/06/2016 10:11 PM, Trevor wrote:

Which is why a single loudness switch on an amplifier is useless since
whether that level is a whisper or a roar depends entirely on the
speaker efficiency, room acoustics, and listening distance.

Exactly. Maybe slightly valid in a quantified turnket system.

And even then a tapped pot with a cap or two is a rather crude
approximation.

The tapped pot system (as used by Dynaco) is really not very useful unless
you know exactly what the speaker efficiency is. The volume control position
that gives you a given sound pressure level is very different between a
Scintilla and an A-7, for instance.

The switch is even worse, but the vast majority of people using the switch
don't use it properly anyway. They turn it on for high volume listening
because they like the added bass.

Go figure. You can't do anything about how people are going to play music
back, all you can do is make it as difficult to screw up as possible.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[Trevor]

On 8/06/2016 9:31 PM, John Williamson wrote:
On 08/06/2016 12:23, geoff wrote:
On 8/06/2016 10:11 PM, Trevor wrote:
Which is why a single loudness switch on an amplifier is useless since
whether that level is a whisper or a roar depends entirely on the
speaker efficiency, room acoustics, and listening distance.

Exactly. Maybe slightly valid in a quantified turnket system.

And even then a tapped pot with a cap or two is a rather crude
approximation.

Yes, but it's cheap to fit and can be promoted as an improvement over
other systems which don't have one fitted. A proper analogue one would
need at least two LCR networks to control frequency, depth and width of
the notch and 2 taps on the pot to get the wanted response, while a
modern class D amplifier could just do it in the control software.


Doesn't have to be a class D power amp to have a microprocessor
controlled pre-amp with DSP to do that and far more. In fact many non
class D amps have done just that for many years.

Trevor.

[geoff]

On 9/06/2016 6:30 PM, Trevor wrote:



Doesn't have to be a class D power amp to have a microprocessor
controlled pre-amp with DSP to do that and far more. In fact many non
class D amps have done just that for many years.

Trevor.



But it still needs to know the actual sound pressure level to do
anything meaningful.

geoff

[Trevor]

On 9/06/2016 5:36 PM, geoff wrote:
On 9/06/2016 6:30 PM, Trevor wrote:
Doesn't have to be a class D power amp to have a microprocessor
controlled pre-amp with DSP to do that and far more. In fact many non
class D amps have done just that for many years.

But it still needs to know the actual sound pressure level to do
anything meaningful.


Which is simply set by the user in any programmable amplifier. That can
either be done (semi) accurately using an SPL meter (common practice in
setting up HT systems properly) or simply adjusted by user to suit their
taste.
Even the latter is better than nothing.

In any case my point is a class D amplifier is NOT a prerequisite.

Trevor.

[JackA]

On Monday, June 6, 2016 at 8:32:55 AM UTC-4, JackA wrote:
Bob Seger & The Silver Bullet Band - Old Time Rock & Roll (1978-79) Stereo. As I may mention a thousand times, many songs, though many recording tracks became available, turned monophonic sounding about the '70's. The thrills of past stereo were gone. I attempted to mix this fine song differently with greater stereo. It may uncover sounds not previously heard. Number of Tracks is (16), but (2) are premixed to stereo. So, it's really like 8-9 Tracks if you delete the duplicates, that serve no purpose. This also includes the unpublished studio ending...
http://www.angelfire.com/empire/abps...imernr-rm3.mp3

Too harsh sound?

Jack

My final, Stereo mix (until next week!!

http://www.angelfire.com/empire/abps...imernr-rm3.mp3

Jack
p.s. This (above) incorporates a Mild or Light Dynamic boost (via Goldwave software). Most people seem to favor it.