Techy speaker sensitivity question
 

"Keith G" wrote in message
...

"Trevor Wilson" wrote in message
...

"Dave Plowman (News)" wrote in message
...
In article ,
Keith G wrote:

They'll be on eBay shortly (Sunday night start) but *collect only* -
beautiful sound (radio voices in particular) but the bass in my little
room is like wading through syrup!!

If the room is causing problems at the bass end it will cause the same
problems on male speech.

**Indeed. However, like any good speaker (and the TLS80 was a good
speaker) with decent bottom end, they require decent damping. I doubt
Keith has heard them with an amp that has decent damping.


Conjecturising again Trevor?

Check this out:

http://www.apah69.dsl.pipex.com/show...000%20spec.JPG

**Provided you've sited them appropriately, they should provide a
respectably flat response with that amp.

Trevor Wilson

Techy speaker sensitivity question
 

"Don Pearce" wrote in message
...
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.

The tech analysis of transmission line speakers I've seen say that its
simply a very wasteful way (in terms of volume versus bass extension versus
efficiency) to make a vented box. That may help explain the large size, all
other things considered.

Techy speaker sensitivity question
 

On Fri, 19 Oct 2007 23:28:57 -0400, "Arny Krueger"
wrote:

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.

The tech analysis of transmission line speakers I've seen say that its
simply a very wasteful way (in terms of volume versus bass extension versus
efficiency) to make a vented box. That may help explain the large size, all
other things considered.


No, not a vented box, but an infinite baffle. The idea is that the
entire back wave is absorbed in the line. Nothing comes out of the
vent, and nothing bounces back at the speaker.

There is a variant in which the line is not stuffed to criticality in
which vent power is used to prop up the low end, but that isn't
strictly a TLS. Forget what it is called right now.

d

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

Techy speaker sensitivity question
 

"Don Pearce" wrote in message
...
On Fri, 19 Oct 2007 23:28:57 -0400, "Arny Krueger"
wrote:

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.

The tech analysis of transmission line speakers I've seen say that its
simply a very wasteful way (in terms of volume versus bass extension
versus
efficiency) to make a vented box. That may help explain the large size,
all
other things considered.

No, not a vented box, but an infinite baffle. The idea is that the
entire back wave is absorbed in the line. Nothing comes out of the
vent, and nothing bounces back at the speaker.

That's one variation of the TL. It's been decades since I heard an IMF, so I
forgot which one they used.

However, if its a sealed box TL, then it is easy to explain how it is less
efficient than the plain sealed box. A well-designed sealed box uses the
resonance of the space behind the driver to improve the efficiency of the
driver at low frequencies. Damp this resonance out, and you've lost a lot of
efficiency.

There is a variant in which the line is not stuffed to criticality in
which vent power is used to prop up the low end, but that isn't
strictly a TLS. Forget what it is called right now.

Let's face it, commercial nomenclature can be kinda loose. :-)

Techy speaker sensitivity question
 

"Trevor Wilson" wrote in message
...

"Keith G" wrote in message
...

"Trevor Wilson" wrote in message
...

"Dave Plowman (News)" wrote in message
...
In article ,
Keith G wrote:

They'll be on eBay shortly (Sunday night start) but *collect
only* -
beautiful sound (radio voices in particular) but the bass in my
little
room is like wading through syrup!!

If the room is causing problems at the bass end it will cause the
same
problems on male speech.

**Indeed. However, like any good speaker (and the TLS80 was a good
speaker) with decent bottom end, they require decent damping. I
doubt Keith has heard them with an amp that has decent damping.


Conjecturising again Trevor?

Check this out:

http://www.apah69.dsl.pipex.com/show...000%20spec.JPG

**Provided you've sited them appropriately, they should provide a
respectably flat response with that amp.


What happened to the order for the 10 amps?

Techy speaker sensitivity question
 

"Keith G" wrote in message
...

"Trevor Wilson" wrote in message
...

"Keith G" wrote in message
...

"Trevor Wilson" wrote in message
...

"Dave Plowman (News)" wrote in message
...
In article ,
Keith G wrote:

They'll be on eBay shortly (Sunday night start) but *collect only* -
beautiful sound (radio voices in particular) but the bass in my
little
room is like wading through syrup!!

If the room is causing problems at the bass end it will cause the same
problems on male speech.

**Indeed. However, like any good speaker (and the TLS80 was a good
speaker) with decent bottom end, they require decent damping. I doubt
Keith has heard them with an amp that has decent damping.


Conjecturising again Trevor?

Check this out:

http://www.apah69.dsl.pipex.com/show...000%20spec.JPG

**Provided you've sited them appropriately, they should provide a
respectably flat response with that amp.


What happened to the order for the 10 amps?

**These are your words:

"Tell you what - if you can personally replicate my one and only Chinese
300B SET for 365 UKP apiece, I'll order 10 of them off you...."

I assumed you did not expect a reply. However, since you are fishing for
one, here it is:

Send you amp to me, freight paid by you. I'll see what I can do about
replicating the amp for the money suggested. You can then organise to have
the amp collected and freighted back to you when I'm finished examining it.

I must alert you to several things, however:

* Australia is a first world nation and our wage levels are significantly
higher than those in China.
* For that amount of money, there are a raft of excellent amplifiers
available in your local market, which can handily outperform your SET amp
with ease.

Trevor Wilson

Trevor Wilson

Techy speaker sensitivity question
 

"Trevor Wilson" wrote in message
...

"Keith G" wrote in message
...

"Trevor Wilson" wrote in message
...

"Keith G" wrote in message
...

"Trevor Wilson" wrote in
message ...

"Dave Plowman (News)" wrote in message
...
In article ,
Keith G wrote:

They'll be on eBay shortly (Sunday night start) but *collect
only* -
beautiful sound (radio voices in particular) but the bass in my
little
room is like wading through syrup!!

If the room is causing problems at the bass end it will cause the
same
problems on male speech.

**Indeed. However, like any good speaker (and the TLS80 was a good
speaker) with decent bottom end, they require decent damping. I
doubt Keith has heard them with an amp that has decent damping.


Conjecturising again Trevor?

Check this out:

http://www.apah69.dsl.pipex.com/show...000%20spec.JPG

**Provided you've sited them appropriately, they should provide a
respectably flat response with that amp.


What happened to the order for the 10 amps?

**These are your words:

"Tell you what - if you can personally replicate my one and only
Chinese
300B SET for 365 UKP apiece, I'll order 10 of them off you...."

I assumed you did not expect a reply. However, since you are fishing
for one, here it is:

Send you amp to me, freight paid by you. I'll see what I can do about
replicating the amp for the money suggested. You can then organise to
have the amp collected and freighted back to you when I'm finished
examining it.


OK, let me see if I can justify the effort and expense of getting you to
replicate what I already know I can get direct from China with no more
than a little Paypal action on my part - I'll get back to you, but if
you don't hear consider that I've taken the decision that I can probably
get by without any amps made by you....



I must alert you to several things, however:

* Australia is a first world nation and our wage levels are
significantly higher than those in China.


No idea/couldn't care less, but if that is the case I guess the next
question would be 'Yes, but for how long?'


* For that amount of money, there are a raft of excellent amplifiers
available in your local market, which can handily outperform your SET
amp with ease.


If you already *know* that (and are not merely conjecturising again) why
do you need me to send you my amp for examination?


Trevor Wilson

Trevor Wilson



You need to turn the Reverb off....

Techy speaker sensitivity question
 

"Keith G" wrote in message
...

"Trevor Wilson" wrote in message
...

"Keith G" wrote in message
...

"Trevor Wilson" wrote in message
...

"Keith G" wrote in message
...

"Trevor Wilson" wrote in message
...

"Dave Plowman (News)" wrote in message
...
In article ,
Keith G wrote:

They'll be on eBay shortly (Sunday night start) but *collect
only* -
beautiful sound (radio voices in particular) but the bass in my
little
room is like wading through syrup!!

If the room is causing problems at the bass end it will cause the
same
problems on male speech.

**Indeed. However, like any good speaker (and the TLS80 was a good
speaker) with decent bottom end, they require decent damping. I doubt
Keith has heard them with an amp that has decent damping.


Conjecturising again Trevor?

Check this out:

http://www.apah69.dsl.pipex.com/show...000%20spec.JPG

**Provided you've sited them appropriately, they should provide a
respectably flat response with that amp.


What happened to the order for the 10 amps?

**These are your words:

"Tell you what - if you can personally replicate my one and only Chinese
300B SET for 365 UKP apiece, I'll order 10 of them off you...."

I assumed you did not expect a reply. However, since you are fishing for
one, here it is:

Send you amp to me, freight paid by you. I'll see what I can do about
replicating the amp for the money suggested. You can then organise to
have the amp collected and freighted back to you when I'm finished
examining it.


OK, let me see if I can justify the effort and expense of getting you to
replicate what I already know I can get direct from China with no more
than a little Paypal action on my part - I'll get back to you, but if you
don't hear consider that I've taken the decision that I can probably get
by without any amps made by you....

**Kinda what I figured.




I must alert you to several things, however:

* Australia is a first world nation and our wage levels are significantly
higher than those in China.


No idea/couldn't care less, but if that is the case I guess the next
question would be 'Yes, but for how long?'

**Best guess? Another 15 years. Maybe less.



* For that amount of money, there are a raft of excellent amplifiers
available in your local market, which can handily outperform your SET amp
with ease.


If you already *know* that (and are not merely conjecturising again) why
do you need me to send you my amp for examination?

**I presume you like the distortion of the amp you have.

Trevor Wilson

Techy speaker sensitivity question
 

"Trevor Wilson" wrote in message
...

"Keith G" wrote in message
...

"Trevor Wilson" wrote in message
...

"Keith G" wrote in message
...

"Trevor Wilson" wrote in
message ...

"Keith G" wrote in message
...

"Trevor Wilson" wrote in
message ...

"Dave Plowman (News)" wrote in message
...
In article ,
Keith G wrote:

They'll be on eBay shortly (Sunday night start) but *collect
only* -
beautiful sound (radio voices in particular) but the bass in
my little
room is like wading through syrup!!

If the room is causing problems at the bass end it will cause
the same
problems on male speech.

**Indeed. However, like any good speaker (and the TLS80 was a
good speaker) with decent bottom end, they require decent
damping. I doubt Keith has heard them with an amp that has
decent damping.


Conjecturising again Trevor?

Check this out:

http://www.apah69.dsl.pipex.com/show...000%20spec.JPG

**Provided you've sited them appropriately, they should provide a
respectably flat response with that amp.


What happened to the order for the 10 amps?

**These are your words:

"Tell you what - if you can personally replicate my one and only
Chinese
300B SET for 365 UKP apiece, I'll order 10 of them off you...."

I assumed you did not expect a reply. However, since you are fishing
for one, here it is:

Send you amp to me, freight paid by you. I'll see what I can do
about replicating the amp for the money suggested. You can then
organise to have the amp collected and freighted back to you when
I'm finished examining it.


OK, let me see if I can justify the effort and expense of getting you
to replicate what I already know I can get direct from China with no
more than a little Paypal action on my part - I'll get back to you,
but if you don't hear consider that I've taken the decision that I
can probably get by without any amps made by you....

**Kinda what I figured.


No flies on you Trevor!! ;-)