Re: Speaker recommendations?
- From: real-address-in-sig@xxxxxxxxxxxxxxx (Rowland McDonnell)
- Date: Tue, 11 Dec 2007 02:54:04 +0000
Jaimie Vandenbergh <jaimie@xxxxxxxxxxxxxxxxxxxxx> wrote:
real-address-in-sig@xxxxxxxxxxxxxxx (Rowland McDonnell) wrote:
<stunned>
Few hundred watts? That wasn't enough for the Beatles in the Shea
stadium, but it's enough to annoy the neighbours over the railway line.
I've annoyed neighbours some significant distance away from me using a
20W mono rig.
Advertised wattages for stereo equipment for the *other* market
segment is a far cry from reality.
The distortion in figures I'm used to seeing is quoting `unsustainable
transient peak power for both channels added together' when one expects
to read `rms for one channel' - so basically you have to divide by four
to get the real maximum power output, and I assume that cheap audio gear
doesn't have the power supply to sustain that sort of thing for more
than a transient peak in any case.
500W for a small desk stereo is not
abnormal,
But even so, that should count as 125W rms per channel and that's really
rather more than you need for a *desk* jobbie, surely?
Mind you - how many speakers? I'm assuming a stereo rig, and that's
invalid these days. One gathers that sub-woofers tend to get fed a lot
of juice, which implies to me that they're often rather inefficient.
Either that, or people enjoy setting off the local university's
seisomgraph.
and advertised wattages for car-fanciers BOOM BOOM kit can
break multiple kilowatts.
And they fit the extra generator, where, exactly? I wonder what
fraction of the claimed power consumption of these stereos exceeds the
power output of the average moped? Say 2.8 hp typical, 746W/hp,
2.088kW, nah, that's 2kW spec approximated to 2.8hp for those of us
still using real money, that is.
Anyway, anything more than 2kW, and your stereo is more powerful than a
moped.
I think what I need is a 1954 Vincent Black Lightning. With nitrous,
and a supercharger, and straight through pipes, and modern suspension,
brakes, and wheels (so it wouldn't really be a Vincent Black Lightning
any more, but could possibly be road legal if you could convince the
DVLA it still counted as `made in 1954' - why? So that I could be both
antisocially noisy /and/ legal; otherwise, I'd have to meet modern noise
regs and that's no fun at all with a bike like that[1]).
I already have the ear plugs.
Anyway, I have for quite a long time wanted to make the ears bleed of
some of these annoying drivers of hot hatchbacks with their antisocial
noise-making machinery, and an aesthetically correct response has long
seemed to me to involve making their ears bleed with a souped-up classic
motorcycle - souped up so I can be sure I can make a get-away.
Vincents are more powerful than mopeds without assistance. I found out
that one reason the post war Vincents were so tuner-friendly was that
they were low compression due to the poor quality of available `pool
petrol' in the immediate post-war years, so if you wanted to use high
octane fuel you could run at much higher compression ratios and then you
were really flying. And back then, you didn't really have to have much
of a silencer if you didn't want one.
As far as I can see they're advertising how inefficiently they can run
their amps.
Nah - if you want inefficient amps, you'd make a class A. I wouldn't be
surprised if some of these people were using class C amps...
I think my Rotel is a 20W job, but it doesn't say anywhere.
I've got a 55w rms/channel Marantz (85w rms by one metric, apparently).
I was happy with that, because it's massively over-specified for
domestic use and will never be pushed.
My stepdad
used to run sound for events requiring medium-sized speaker stacks
(open air or tent, up to 10,000 crowd or so) and the three
top/mid/bass amps there were 400/200/200W I think.
Sounds about right - but those big speakers are often surprisingly
efficient.
I can trouble the neighbours with my speakers (Lowther Acousta cabinets,
modern PM7 Lowther drivers, design from about 1967), and I'm pretty sure
I don't run them outside the 10W rms spec. They're only about 6"
diameter cones so you can imagine how they leap around when you do turn
up the power.
btw, that 10W rms spec for Lowther drivers hasn't changed since the days
Jimi Hendrix used to blow them up (he used 'em at home, so I can be
pretty sure that when I listen to Hendrix on guitar, it sounds the way
he was thinking of) - but the modern units can now handle 100W peak, so
he'd have an easier time these days, I suspect.
Rowland.
[1] My Honda was made in 1987 and runs 100% legitmate silencing, is
fitted with a legal number plate, and generally complies with all the
regulations it needs to, oh yes. What, you think I'm daft enough to go
around signalling to all the policemen that I'm a prat who needs talking
to? I might well be such a prat, but I'm not going to let them know if
I can help it.
--
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