Audio, hi-fi and car audio

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- uk.rec.audio (General Audio and Hi-Fi) (https://www.audiobanter.co.uk/uk-rec-audio-general-audio/)

- - Slam (https://www.audiobanter.co.uk/uk-rec-audio-general-audio/533-slam.html)

In article , Old Fart at Play
wrote:
Jim Lesurf wrote:

Also, 2,200 uF is perhaps a tad on the small side if you want to
support sustained mean currents of the order of over 30 Amps per
channel (i.e. over 60 Amps total for stereo), particularly using a
non-SMPS! The resulting voltage ripple may be too high.

Where is all this current going? Does this hypothetical amplifier
provide 25kW per channel into 8ohms?

The difficulty is that some people may wish to use loudspeaker loads that
may have impedances that go down to the 1 - 2 Ohm region. (e.g. some
electrostatic or magnaplaner units) or use multiple speakers in parallel.
Hence in some cases you may need to be able to deliver over 30 Amps if you
want the amplifier to be able to assert output voltages in the 30 - 70 V
range into such loads without running out of steam...

If someone is building an amp privately for their own use, then they only
need to ensure it works well with their speakers. However when I was
designing a 'high power' amp for commercial sale I felt I had to ensure it
could deliver high currents for people who chose to use it with 'difficult'
loudspeakers. This may, of course, have been influenced by my own
preference for speakers like electrostatics. :-)

The result does imply 'quite high' powers may be available into low
impedance loads. However such loads are often inefficient (and reactive,
which adds to the desiger's headache) so this may be needed for people to
be able to enjoy music using such loudspeakers.

The alternative would be an amp that could deliver 200W into 8 Ohm light
bulbs, but which collapsed in a heap as soon as many real loudspeakers were
used. Since the purpose is to allow the user to listen to music, my
reaction was to ensure a fair amount of current was available if needed.

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html

In article , Trevor Wilson
wrote:

**Just a small pedantic point:

A Koala is not a bear. In fact, the Koala is more closely related to the
Kangaroo, than it is to _any_ mammal.

OK, its a fair cop. I didn't know that! :-) Next time I'll stick to using
ravens and writing desks as my example and people can then argue about what
that meant. :-)

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html

Next time I'll stick to using
ravens and writing desks as my example and people can then argue about what
that meant. :-)

What's the connection between a Raven and a writing desk?

=== Andy Evans ===
Visit our Website:- http://www.artsandmedia.com
Audio, music and health pages and interesting links.

"Wally" wrote in message
...
Stimpy wrote:

Sit on the floor in front of a kick drum when someone kicks it
hard...
That's slam :-)

A kick drum was exactly what I was thinking while reading John's
comments.
You get it in band rehearsal rooms - feel it in the guts.

That's exactly the feeling! When I was a drummer, I used to delight
in getting people to sit cross-legged on the floor about a metre in
front of the kick drum... after one kick they understood slam :-)))

"Kurt Hamster" wrote in message
...
On Thu, 2 Oct 2003 09:20:58 +0100, Stimpy used
to say...

"Kurt Hamster" wrote in message
...

Whoo-Hoo... Fretless Bass homer mmmmmmm, droolll /drool

I do hope you've been boning up on Jaco and my mate Mo?

Mo.... He da man!! Still remember hearing him for the first time
with
Jeff Beck about 20 years ago - blew me away big time...

Mo thanks you for the comment :)

At the risk of turning this into alt.music.mo-foster, I dug out his
solo album Bel Assis over the weekend. The overall sound comes across
as a bit '80s new age' now but there's some lovely playing on there...

Jeff Beck (was: Slam)

"Clive Backham" wrote in message
...

If you like 60's British R&B, get "Truth" and "Beckola".
If you like jazz/rock, get "Blow by Blow", "Wired" and "Live with
the
Jan Hammer Group", and perhaps "There and Back".
Three albums I found pretty forgetable were "Rough & Ready", "Beck,
Bogart, Appice" and "Flash". Others will no doubt disagree.
I like quite a lot of "Guitar Shop". The last Jeff Beck album I
bought
was "Who Else", which apart from a couple of nice tracks was pretty
awful.

"Must haves"? Tricky. I suspect most would say that Truth and Blow
by
Blow are the two absolute classics, but I personally prefer Beckola
and Wired.

That's almost exactly what I was about to say!

I'd probably go for 'There and Back' over 'Jan Hammer Group' if only
for the track 'Space Boogie' but 'Blow by blow' and 'Wired' are
essentials.

__Stimpy__