Was looking at some info today on the KEF B110, and the KEF blurb says it
should be front mounted on the baffle, recessed so the chassis is flush
with the front of the baffle. Yet on perhaps its most famous application,
the LS 3/5a, it's mounted to the back of the baffle.

--
*Vegetarians taste great*

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

On Sat, 12 Dec 2015 00:32:08 +0000 (GMT), "Dave Plowman (News)"
wrote:


Was looking at some info today on the KEF B110, and the KEF blurb says it
should be front mounted on the baffle, recessed so the chassis is flush
with the front of the baffle. Yet on perhaps its most famous application,
the LS 3/5a, it's mounted to the back of the baffle.

Since the driver is pretty well transparent to sound, the baffle has
very nearly the same diffractive effect whether it is in front of or
behind the driver. I'm guessing that they went this way with the LS
3/5a for the sake of ruggedness.

d

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On 12/12/2015 00:32, Dave Plowman (News) wrote:
Was looking at some info today on the KEF B110, and the KEF blurb says it
should be front mounted on the baffle, recessed so the chassis is flush
with the front of the baffle. Yet on perhaps its most famous application,
the LS 3/5a, it's mounted to the back of the baffle.

Maybe because it's intended to go on a shelf above the desk in an
outside-broadcast van
so moving the B110 back 3/4" keeps it in phase with the T27 at the
crossover frequency.

--
Eiron.

In article ,
Eiron wrote:
On 12/12/2015 00:32, Dave Plowman (News) wrote:
Was looking at some info today on the KEF B110, and the KEF blurb says
it should be front mounted on the baffle, recessed so the chassis is
flush with the front of the baffle. Yet on perhaps its most famous
application, the LS 3/5a, it's mounted to the back of the baffle.

Maybe because it's intended to go on a shelf above the desk in an
outside-broadcast van
so moving the B110 back 3/4" keeps it in phase with the T27 at the
crossover frequency.

Thing is the Kef blurb says mounting it behind the baffle introduces
unwanted colorations at the mid band.

Perhaps keeping the tweeter and bass unit as close as possible on axis
while retaining the best distance phase wise is just better?

--
*A closed mouth gathers no feet.

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

On 12/12/2015 12:06, Dave Plowman (News) wrote:
In article ,
Eiron wrote:
On 12/12/2015 00:32, Dave Plowman (News) wrote:
Was looking at some info today on the KEF B110, and the KEF blurb says
it should be front mounted on the baffle, recessed so the chassis is
flush with the front of the baffle. Yet on perhaps its most famous
application, the LS 3/5a, it's mounted to the back of the baffle.

Maybe because it's intended to go on a shelf above the desk in an
outside-broadcast van
so moving the B110 back 3/4" keeps it in phase with the T27 at the
crossover frequency.

Thing is the Kef blurb says mounting it behind the baffle introduces
unwanted colorations at the mid band.

How about this then?

http://downloads.bbc.co.uk/rd/pubs/reports/1979-22.pdf

--
Eiron.

In article ,
Eiron wrote:
On 12/12/2015 12:06, Dave Plowman (News) wrote:
In article ,
Eiron wrote:
On 12/12/2015 00:32, Dave Plowman (News) wrote:
Was looking at some info today on the KEF B110, and the KEF blurb says
it should be front mounted on the baffle, recessed so the chassis is
flush with the front of the baffle. Yet on perhaps its most famous
application, the LS 3/5a, it's mounted to the back of the baffle.

Maybe because it's intended to go on a shelf above the desk in an
outside-broadcast van
so moving the B110 back 3/4" keeps it in phase with the T27 at the
crossover frequency.

Thing is the Kef blurb says mounting it behind the baffle introduces
unwanted colorations at the mid band.

How about this then?

http://downloads.bbc.co.uk/rd/pubs/reports/1979-22.pdf

That's the 5/8. Interesting that the later units dispensed with the square
slot over the bass unit.

The other thing that's interesting about that article is that they say the
requirement was to not use a midrange because of the cost and complexity
of the crossover, which is very true, especially with its predecessor the
5/5 which was passive. But then they used an active design.

--
*How many roads must a man travel down before he admits he is lost?

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

On 12/12/2015 11:32 AM, Dave Plowman (News) wrote:
Was looking at some info today on the KEF B110, and the KEF blurb says it
should be front mounted on the baffle, recessed so the chassis is flush
with the front of the baffle. Yet on perhaps its most famous application,
the LS 3/5a, it's mounted to the back of the baffle.


**I'll let you into a dirty little secret:

The LS3/5A is/was the most over-rated speaker of all time. Muddy, poor
imaging and just plain average.

There, I said it. The emperor has no clothes.

Forget the LS3/5A and mount the B110 the way KEF advises.

--
Trevor Wilson
www.rageaudio.com.au

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In article ,
Trevor Wilson wrote:
On 12/12/2015 11:32 AM, Dave Plowman (News) wrote:
Was looking at some info today on the KEF B110, and the KEF blurb says it
should be front mounted on the baffle, recessed so the chassis is flush
with the front of the baffle. Yet on perhaps its most famous application,
the LS 3/5a, it's mounted to the back of the baffle.


**I'll let you into a dirty little secret:

The LS3/5A is/was the most over-rated speaker of all time. Muddy, poor
imaging and just plain average.

Right.

There, I said it. The emperor has no clothes.

Did one fall of the shelf and smite you? ;-)

Forget the LS3/5A and mount the B110 the way KEF advises.

I was wondering if anyone had experimented and could give chapter and
verse on the effect?

--
wife.

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

On 13/12/2015 11:27 AM, Dave Plowman (News) wrote:
In article ,
Trevor Wilson wrote:
On 12/12/2015 11:32 AM, Dave Plowman (News) wrote:
Was looking at some info today on the KEF B110, and the KEF blurb says it
should be front mounted on the baffle, recessed so the chassis is flush
with the front of the baffle. Yet on perhaps its most famous application,
the LS 3/5a, it's mounted to the back of the baffle.


**I'll let you into a dirty little secret:

The LS3/5A is/was the most over-rated speaker of all time. Muddy, poor
imaging and just plain average.

Right.

There, I said it. The emperor has no clothes.

Did one fall of the shelf and smite you? ;-)

**No. I just did a blind listen to a pair. As should anyone who thinks
the design is any good. I've since heard them many times under different
brand names. They are still ordinary sounding. There are many fine small
speakers which will easily beat the LS3/5A. Unless, of course, you
happen to like the horrible, far-from-accurate sound that they produce.


Forget the LS3/5A and mount the B110 the way KEF advises.

I was wondering if anyone had experimented and could give chapter and
verse on the effect?

**Look up "diffraction effects in loudspeakers". I'll betcha there's a
great deal of information out there.


--
Trevor Wilson
www.rageaudio.com.au

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On 13/12/2015 11:27 AM, Dave Plowman (News) wrote:
In article ,
Trevor Wilson wrote:
On 12/12/2015 11:32 AM, Dave Plowman (News) wrote:
Was looking at some info today on the KEF B110, and the KEF blurb says it
should be front mounted on the baffle, recessed so the chassis is flush
with the front of the baffle. Yet on perhaps its most famous application,
the LS 3/5a, it's mounted to the back of the baffle.


**I'll let you into a dirty little secret:

The LS3/5A is/was the most over-rated speaker of all time. Muddy, poor
imaging and just plain average.

Right.

There, I said it. The emperor has no clothes.

Did one fall of the shelf and smite you? ;-)

Forget the LS3/5A and mount the B110 the way KEF advises.

I was wondering if anyone had experimented and could give chapter and
verse on the effect?


** http://www.linkwitzlab.com/diffraction.htm
http://www.bodziosoftware.com.au/article5.pdf
http://www.salksound.com/wp/?p=160


--
Trevor Wilson
www.rageaudio.com.au

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