Don Pearce wrote:

"Keith G" wrote:

To spare my remaining active braincell (see other recent post) could
someone kindly tell me what the speaker sensitivity figure for 1 Watt
would be if the brochure (IMF TLS 80s) quotes:

'Efficiency measured via Pink Noise at 1 metre for 40 Watts = 98 dB'

That's 82dB

I should have read the question properly shouldn't I ?

Yes. It's 82dB (AES method). That's remarkably insensitive.

Graham

On Fri, 19 Oct 2007 12:47:01 +0100, Eeyore
wrote:



Don Pearce wrote:

"Keith G" wrote:

To spare my remaining active braincell (see other recent post) could
someone kindly tell me what the speaker sensitivity figure for 1 Watt
would be if the brochure (IMF TLS 80s) quotes:

'Efficiency measured via Pink Noise at 1 metre for 40 Watts = 98 dB'

That's 82dB

I should have read the question properly shouldn't I ?

Yes. It's 82dB (AES method). That's remarkably insensitive.

Graham

It's a TLS. And it uses the good old B139 driver, which was never the
loudest. A friend of mine bought a pair when they were new and I seem
to remember he paid a fortune for them. I did a quick measure-up and
went home and built my own pair for less than a tenth the price. I
used them for quite a while.

d

--
Pearce Consulting
http://www.pearce.uk.com

"Keith G"

To spare my remaining active braincell (see other recent post) could
someone kindly tell me what the speaker sensitivity figure for 1 Watt
would be if the brochure (IMF TLS 80s) quotes:

'Efficiency measured via Pink Noise at 1 metre for 40 Watts = 98 dB'

??


** I seriously doubt that figure is even faintly for real.

1. 40 watts of pink noise requires a power amp of at least 500 watts to
deliver (ie 12 db peak to rms ratio).

2. 40 watts of continuous input ( to some crap pommy hi-fi speaker) causes
horrendous voice coil heating and hence many dBs of thermal sound
compression.

3. 40 watts of input will cause partial demagnetisation of the magnetic
force on the voice coil and more dBs of sound compression.


It's utter ******** !!.

It's not a measurement, but a falsely calculated estimate based on
hypothetical guesses.

IOW - the Yankee Dodge method.

Peeeeeeeukkkkkkeee


BTW

Anyone prepared to donate one 303 calibre bullet to put a poor dumb animal
called " Keith G" out of its misery ??

Have a heart.




........ Phil

"Don Pearce" wrote


It's a TLS. And it uses the good old B139 driver, which was never the
loudest. A friend of mine bought a pair when they were new and I seem
to remember he paid a fortune for them. I did a quick measure-up and
went home and built my own pair for less than a tenth the price. I
used them for quite a while.


And developed your taste for *excessive* bass? :-)

Well mine are on eBay now (Auction No. 270178019709) with a Start Price
of 200 quid, auction starting 9:00 pm, Sunday Night.

(Collect only - *crane* vehicle advised...!! :-)

On Fri, 19 Oct 2007 13:58:21 +0100, "Keith G"
wrote:


"Don Pearce" wrote


It's a TLS. And it uses the good old B139 driver, which was never the
loudest. A friend of mine bought a pair when they were new and I seem
to remember he paid a fortune for them. I did a quick measure-up and
went home and built my own pair for less than a tenth the price. I
used them for quite a while.


And developed your taste for *excessive* bass? :-)

To a midget, Tom Cruise is too tall, I suppose :-)

Well mine are on eBay now (Auction No. 270178019709) with a Start Price
of 200 quid, auction starting 9:00 pm, Sunday Night.

(Collect only - *crane* vehicle advised...!! :-)


It's all that Dr. Bailey's long fibre wool that does it.

d

--
Pearce Consulting
http://www.pearce.uk.com

"Eeyore" wrote in message
...


Don Pearce wrote:

"Keith G" wrote:

To spare my remaining active braincell (see other recent post) could
someone kindly tell me what the speaker sensitivity figure for 1 Watt
would be if the brochure (IMF TLS 80s) quotes:

'Efficiency measured via Pink Noise at 1 metre for 40 Watts = 98 dB'

That's 82dB

I should have read the question properly shouldn't I ?

Yes. It's 82dB (AES method). That's remarkably insensitive.

IME, not atypical for high end speakers.

I think the sensitivity of my NHT 2.5i speakers is in the same range.

Low efficiency is how you get deep bass out of small boxes, ya know! ;-)

"Don Pearce" wrote in message
...
On Fri, 19 Oct 2007 13:58:21 +0100, "Keith G"
wrote:


"Don Pearce" wrote


It's a TLS. And it uses the good old B139 driver, which was never
the
loudest. A friend of mine bought a pair when they were new and I
seem
to remember he paid a fortune for them. I did a quick measure-up and
went home and built my own pair for less than a tenth the price. I
used them for quite a while.


And developed your taste for *excessive* bass? :-)

To a midget, Tom Cruise is too tall, I suppose :-)


I believe the trick is to use a small tea chest....

??



Well mine are on eBay now (Auction No. 270178019709) with a Start
Price
of 200 quid, auction starting 9:00 pm, Sunday Night.

(Collect only - *crane* vehicle advised...!! :-)


It's all that Dr. Bailey's long fibre wool that does it.


Is that what it is? :-)

On Fri, 19 Oct 2007 09:11:54 -0400, "Arny Krueger"
wrote:


"Eeyore" wrote in message
...


Don Pearce wrote:

"Keith G" wrote:

To spare my remaining active braincell (see other recent post) could
someone kindly tell me what the speaker sensitivity figure for 1 Watt
would be if the brochure (IMF TLS 80s) quotes:

'Efficiency measured via Pink Noise at 1 metre for 40 Watts = 98 dB'

That's 82dB

I should have read the question properly shouldn't I ?

Yes. It's 82dB (AES method). That's remarkably insensitive.

IME, not atypical for high end speakers.

I think the sensitivity of my NHT 2.5i speakers is in the same range.

Low efficiency is how you get deep bass out of small boxes, ya know! ;-)


I don't think anyone is going to call the IMF a small box. But then I
suppose it isn't really a box at all.

d

--
Pearce Consulting
http://www.pearce.uk.com

"Keith G" wrote in message
...

"Don Pearce" wrote in message
...
On Fri, 19 Oct 2007 13:58:21 +0100, "Keith G"
wrote:


"Don Pearce" wrote


It's a TLS. And it uses the good old B139 driver, which was never the
loudest. A friend of mine bought a pair when they were new and I seem
to remember he paid a fortune for them. I did a quick measure-up and
went home and built my own pair for less than a tenth the price. I
used them for quite a while.


And developed your taste for *excessive* bass? :-)

To a midget, Tom Cruise is too tall, I suppose :-)


I believe the trick is to use a small tea chest....

??



Well mine are on eBay now (Auction No. 270178019709) with a Start Price
of 200 quid, auction starting 9:00 pm, Sunday Night.

(Collect only - *crane* vehicle advised...!! :-)


It's all that Dr. Bailey's long fibre wool that does it.


Is that what it is? :-)

The IMFs used plastic foam instead of Dr Bailey's long haired underpants.
They had different densities depending on where they were in the cabinet.
That made the 'speaker largely insensitive to movement whilst shipping.
Long-haired wool didn't take kindly to being shaken about and would tend to
settle.

As to the sensitivity, my TLS50s were similarly insensitive. I first used
them with a 30watt SS amp, and the sound was awful. A scope across the
terminals confirmed the amp was clipping, almost continuously. A change to
a 75watt amp (93 actually) cured the problem.

Nevertheless, great 'speakers if you've the room, can back them up against a
wall and drive them hard.

S.

--
http://audiopages.googlepages.com

"Serge Auckland" wrote


The IMFs used plastic foam instead of Dr Bailey's long haired
underpants.


That's a relief....


They had different densities depending on where they were in the
cabinet. That made the 'speaker largely insensitive to movement whilst
shipping. Long-haired wool didn't take kindly to being shaken about
and would tend to settle.


I have pulled that stuff out if speakers in the past and it chokes me to
remember it!!



As to the sensitivity, my TLS50s were similarly insensitive. I first
used them with a 30watt SS amp, and the sound was awful. A scope
across the terminals confirmed the amp was clipping, almost
continuously. A change to a 75watt amp (93 actually) cured the
problem.


Out of curiosity I ran those speakers on various amps and got some nice
sounds out of them all really, at various levels - all the way down to
my 3.5 Watt SET. They certainly sounded better on the Technics stuff
(also on eBay now for a Sunday night start) which was very relaxed and
laid-back. There's no doubt, I am going to miss the 'radio voices'
now....



Nevertheless, great 'speakers if you've the room, can back them up
against a wall and drive them hard.


Ooh, er!!

Are we back on midgets and Tom Cruise here? :-)