"Trevor Wilson" wrote in message
...

"Sally" wrote in message
...
I should like to buy something simliar to the Bose Acoustic Wave system.

**Thyere is very little to directly compete with the vastly over-priced
Bose clock radio. It actually sounds quite decent, but costs far too much
for what it is. Here's a little test: See if you can buy the Bose at a
discount (apart from the regular 'factory discounts'). You will likely
have real problems in doing so. Bose regularly engage in (illegal) price
maintenance practices. When asking for a discount (try for at least 20%)
you should remind the retailer than you will be approaching the relevant
consumer agency to complain about price maintenance. Maybe they'll lower
the price a little.

Can anyone recommend these or perhaps there are better systems which are
cheaper as these seem very expensive. I am only interested in quality
systems.

**There isn't much to directly compete with the Bose in that SPECIFIC
package. You can easily find better sonic value for money elsewhere,
however.


--
Trevor Wilson
www.rageaudio.com.au


thanks for all your replies. A lot of them latterly had me completely
confused with all the technical jargon. Perhaps I will take Bose up on
their offer of a 30 day trial unless I find something in the meantime which
qualifies.
Sally

In article , Jim Lesurf
wrote:
In article , Jem Raid
wrote:

http://www.adx.co.nz/techinfo/audio/gainclone1.htm


I'll have a look at the above when I get a chance.

I've now had a look. Also at the data sheet for the IC and some diagrams.

If you're only using the amp at low power levels, then the levels of
hum/buzz may not be audible in themselves. However the distortion plots,
etc, shown on the above webpage are quite misleading, so have to be
interpreted with caution. Maybe this is why the author expresses a lack of
confidence in such readings. :-)

To explain: The distortion plots he gives show the harmonics for a
sinewave. However any hum/buzz will produce components that may not be at
a simple integer harmonic of the test sinewave frequency. Hence the actual
levels of anharmonic distortion might be far worse than implied by taking
his plots as 'distortion figures'. This arises as he's used an FTT analyser
and picked out only the harmonics to measure. It would be 'safer' in this
context to use a nulling bridge, or sum all the powers at frequencies
*other* than the input, to ensure all distortions and noise are
represented. People tend to avoid this, though, as the results look less
impressive. ;-)

There might be larger components at f +/- n*100Hz than at n*f.

Another point to bear in mind that musical transients might be more
distorted even if steady low-power tones are not seriously affected.
sinewave tests don't always show this very well.

Electrolytic caps are fairly cheap so I'd recommend using something
somewhat larger than 1000 microF to avoid any problems. I'd be interested
to know what rationale there is for any deliberate choice of small caps
(except for cheapness sake). If it is argued that smaller caps 'affect
the sound' I wonder if it may be a result of transient modulation
distortions.

The IC looks to me as if it could work quite well within limits, though, so
may be useful for simplicity's sake.

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

"Dave Plowman (News)" wrote in message
...
In article ,
Keith G wrote:
Yes indeed - I am now getting a *house (bungalow) filling* sound out of
a pair of tiddly little 4 inchers made from banana skins! :-)

Fostex make tiny IB speakers for pro use - I use them all the time on
location. Although headphones for a 'take'.


IB?


Certainly making me reconsider my views on 'horn loaded' small drivers
and makes me wonder if the Bose 'Waveform' stuff is as bad as most
people seem to think it is? (I've never 'Bosed' myself other than once
had a very small Bose centre speaker in an early AV setup and it
sounded perfectly fine to me....??)

Trouble with horns is you tend to hear the horn.


Yes, you do but I'm pleased to say my 'Not So Little Pink Pair' do genuinely
sound a lot less *horny* than the Loths!

Keith G wrote:

Fostex make tiny IB speakers for pro use - I use them all the time on
location. Although headphones for a 'take'.

IB?

Infinite Baffle, or sealed box.

--
Eiron

I have no spirit to play with you; your dearth of judgment renders you
tedious.

"Sally" wrote in message
...

"Trevor Wilson" wrote in message
...

"Sally" wrote in message
...
I should like to buy something simliar to the Bose Acoustic Wave system.

**Thyere is very little to directly compete with the vastly over-priced
Bose clock radio. It actually sounds quite decent, but costs far too much
for what it is. Here's a little test: See if you can buy the Bose at a
discount (apart from the regular 'factory discounts'). You will likely
have real problems in doing so. Bose regularly engage in (illegal) price
maintenance practices. When asking for a discount (try for at least 20%)
you should remind the retailer than you will be approaching the relevant
consumer agency to complain about price maintenance. Maybe they'll lower
the price a little.

Can anyone recommend these or perhaps there are better systems which are
cheaper as these seem very expensive. I am only interested in quality
systems.

**There isn't much to directly compete with the Bose in that SPECIFIC
package. You can easily find better sonic value for money elsewhere,
however.


--
Trevor Wilson
www.rageaudio.com.au


thanks for all your replies. A lot of them latterly had me completely
confused with all the technical jargon. Perhaps I will take Bose up on
their offer of a 30 day trial unless I find something in the meantime
which qualifies.
Sally
Dear Sally,

Most of the posts refer to something that is mostly inaudble anyway, dunno
why we bother.

Bosed for ever !!!

:-) Lol. Lmao even Roflmao.

Regards - Jim

In article ,
Jem Raid wrote:
I'd suspect that it's due to the very low power output in today's
terms where the caps you've used may be adequate. But then you've
wasted a great deal of money on over large transformers. Large
smoothing capacitors compared to transformer loading are a good idea
for peaks - the other way round simply wasting money.

At 50 Watts it's only 3dB lower than the industry 'standard' of 100
Watts hardly what anyone would call low power.

Then you don't need a 160 VA - effectively watts - transformer. And that's
the expensive bit.

And what's the chip? Most car stuff is designed to give 25 watts into 4
ohms. Some can give more by raising the HT rail, but 50 watts into 8 ohms
would be unusual.

--
*There are two sides to every divorce: Yours and **** head's*

Dave Plowman London SW
To e-mail, change noise into sound.

thanks for all your replies. A lot of them latterly had me completely
confused with all the technical jargon. Perhaps I will take Bose up on
their offer of a 30 day trial unless I find something in the meantime
which qualifies.
Sally

Nooooooo!

For that £800 you can buy a very nice system, what about a Teac Reference
300?

In article ,
Keith G wrote:
Yes indeed - I am now getting a *house (bungalow) filling* sound out
of a pair of tiddly little 4 inchers made from banana skins! :-)

Fostex make tiny IB speakers for pro use - I use them all the time on
location. Although headphones for a 'take'.

IB?

Infinite baffle. Tends to give the lowest colouration 'conventional'
speaker design.


Certainly making me reconsider my views on 'horn loaded' small drivers
and makes me wonder if the Bose 'Waveform' stuff is as bad as most
people seem to think it is? (I've never 'Bosed' myself other than once
had a very small Bose centre speaker in an early AV setup and it
sounded perfectly fine to me....??)

Trouble with horns is you tend to hear the horn.

Yes, you do but I'm pleased to say my 'Not So Little Pink Pair' do
genuinely sound a lot less *horny* than the Loths!

Think is that power from amps is cheap these days. Horns were popular when
it wasn't, as they're more efficient. And remain popular for some PA
speakers where very high power levels are needed.

But for natural reproduction of speech and music things have moved on.

--
*Microsoft broke Volkswagen's record: They only made 21.4 million bugs.

Dave Plowman London SW
To e-mail, change noise into sound.

Dave Plowman (News) wrote:

And what's the chip? Most car stuff is designed to give 25 watts into 4
ohms. Some can give more by raising the HT rail, but 50 watts into 8 ohms
would be unusual.

A National Semiconductor LM4780 will give 60w into 8 ohms.
http://www.national.com/ds.cgi/LM/LM4780.pdf
They'll send free samples if you ask nicely!

--
Eiron

I have no spirit to play with you; your dearth of judgment renders you
tedious.

"Sally" wrote in message
...

"Trevor Wilson" wrote in message
...

"Sally" wrote in message
...
I should like to buy something simliar to the Bose Acoustic Wave system.

**Thyere is very little to directly compete with the vastly over-priced
Bose clock radio. It actually sounds quite decent, but costs far too much
for what it is. Here's a little test: See if you can buy the Bose at a
discount (apart from the regular 'factory discounts'). You will likely
have real problems in doing so. Bose regularly engage in (illegal) price
maintenance practices. When asking for a discount (try for at least 20%)
you should remind the retailer than you will be approaching the relevant
consumer agency to complain about price maintenance. Maybe they'll lower
the price a little.

Can anyone recommend these or perhaps there are better systems which are
cheaper as these seem very expensive. I am only interested in quality
systems.

**There isn't much to directly compete with the Bose in that SPECIFIC
package. You can easily find better sonic value for money elsewhere,
however.


--
Trevor Wilson
www.rageaudio.com.au


thanks for all your replies. A lot of them latterly had me completely
confused with all the technical jargon. Perhaps I will take Bose up on
their offer of a 30 day trial unless I find something in the meantime
which qualifies.

**If you do buy the Bose, push VERY hard for a big discount. The scumbags
who sell Bose are making BIG profits. They'll come out with some bull****
story about "tight margins", "restricted supply" some other nonsense. The
truth is far more sinister, however. Bose retailers are stitched up and they
NEVER discount.


--
Trevor Wilson
www.rageaudio.com.au