wrote in message
oups.com...
I have a pair of 'AR' Hi Fi speaker enclosures which went into storage
for a while and came out with rotted suspension on the bass cones. In
order to change these bass units I have been trying to find who makes
hi fi speakers these days. Not just guitar amp speakers or car
speakers, real hi-fi speakers. It used to be Goodmans, Celestion etc.
but all searches under speakers, frame speakers, chassis speakers,
just turn up rows of systems or piles of wooden boxes. I've got wooden
boxes, I just want the speakers. Can somone please help me with a
manufacturer of good quality units to fit in my enclosures.

**Replacing the surrounds is easy, cheap and a guaranteed way of getting the
speakers to sound at least close to what they once did. Installing third
party drivers is a crap shoot, unless you can do the legwork to find the
right driver for that enclosure.

Trevor Wilson

In article ,
Eiron wrote:
Fleetie wrote:
Bin them; they're old and past it.

Having, as I do, an electroacoustics degree, I can tell you that
drivers and enclosures (well, in the case of the woofers, anyway) are
designed to go together. The volume of the cabinet interacts with the
mass, stiffness, resonances, etc. of the driver, and it is a very
complex matter to get the performance required. The volume of the
cabinet, and the length and diameter of any bass port all "show up" in
the electrical circuit too, so then the crossover also gets involved.

Sure, you could get a woofer that fits, and bung it in, but do
*not* expect the result to be "hi-fi" (whatever that means), and don't
expect the result to be anything like what was intended, or achieved,
by the manufacturer in the configuration as sold.

That's not strictly true. If the replacement woofer has the right
impedance and sensitivity it will match the midrange; if you put the
Thiele-Small parameters and the box size into a design program such
as WinISD you will see if it works, possibly with some adjustment of
the reflex port tuning.

I replaced the bass units in a pair of Celestion Ditton 15s (the ones with
an ABR) using generic Audax units. And expected the results to be very
poor. But they actually worked quite well - without making any
measurements. So on a Keith G speaker scale probably about
9 out of 10. ;-)

Just luck, obviously.

--
*The modem is the message *

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

In article ,
Trevor Wilson wrote:
**Replacing the surrounds is easy, cheap and a guaranteed way of getting
the speakers to sound at least close to what they once did. Installing
third party drivers is a crap shoot, unless you can do the legwork to
find the right driver for that enclosure.

I would have thought the surrounds would have a great influence on the TS
parameters. Unless you can get identical ones.

--
*Everyone has a photographic memory. Some just don't have film*

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

"Dave Plowman (News)" wrote in message
...
In article ,
Eiron wrote:
Fleetie wrote:
Bin them; they're old and past it.

Having, as I do, an electroacoustics degree, I can tell you that
drivers and enclosures (well, in the case of the woofers, anyway)
are
designed to go together. The volume of the cabinet interacts with
the
mass, stiffness, resonances, etc. of the driver, and it is a very
complex matter to get the performance required. The volume of the
cabinet, and the length and diameter of any bass port all "show up"
in
the electrical circuit too, so then the crossover also gets
involved.

Sure, you could get a woofer that fits, and bung it in, but do
*not* expect the result to be "hi-fi" (whatever that means), and
don't
expect the result to be anything like what was intended, or
achieved,
by the manufacturer in the configuration as sold.

That's not strictly true. If the replacement woofer has the right
impedance and sensitivity it will match the midrange; if you put the
Thiele-Small parameters and the box size into a design program such
as WinISD you will see if it works, possibly with some adjustment of
the reflex port tuning.

I replaced the bass units in a pair of Celestion Ditton 15s (the ones
with
an ABR) using generic Audax units. And expected the results to be very
poor. But they actually worked quite well - without making any
measurements. So on a Keith G speaker scale probably about
9 out of 10. ;-)

Just luck, obviously.


No, it's just a case of 'cut the crap and just get on with it' - won't
work every time, but works well enough/often enough to make it worth
trying if you can'y lay hold of the zack same units.

I've swapped drivers (and crossovers) about in a number of small
speakers here and nobody's ever noticed anything or commented yet. The
biggest difference I have noticed is that the treble can 'come and go' a
bit by comparison, but after a couple of days I find I've got used to
'em and don't query it too much - a speaker that at least works sounds a
whole lot better than one that don't work at all....

"Dave Plowman (News)"

I would have thought the surrounds would have a great influence on the TS
parameters. Unless you can get identical ones.


** No - suspension stiffness is a non critical TS parameter.

In any case - foam surrounds are much alike.


YOU ****ING POMMY ****WIT




........ Phil

wrote in message
oups.com...
I have a pair of 'AR' Hi Fi speaker enclosures which went into storage
for a while and came out with rotted suspension on the bass cones. In
order to change these bass units I have been trying to find who makes
hi fi speakers these days.

Why not have a look here, you might be able to buy replacement drivers to
suit.What model AR's have you got. Any respectable speaker repairer will
source the correct surrounds for you and fit them.

http://layneaudio.hypermart.net/AR.htm

I have a pair of 'AR' Hi Fi speaker enclosures


** Why hide the ****ing model number ??

Makes you look a dead set, PITA ****ing troll.

Nothing out of place here, of course .....

In pommy ****wit TROLL heaven !@!@!


Peeeuuuukkeee...........




......... Phil

"Keith G" wrote in message
...

I've swapped drivers (and crossovers) about in a number of small speakers
here and nobody's ever noticed anything or commented yet.

Keith, this explains a lot of the favorable impressions that you've posted
as responses by your friends and family about some of the highly
questionable audio gear that you seem to favor.

The biggest difference I have noticed is that the treble can 'come and go'
a bit by comparison, but after a couple of days I find I've got used to
'em and don't query it too much - a speaker that at least works sounds a
whole lot better than one that don't work at all....

And this explains a lot of the favorable impressions of your own that you've
posted about some of the highly questionable audio gear that you seem to
favor.

"Dave Plowman (News)" wrote in message
...
In article ,
Trevor Wilson wrote:
**Replacing the surrounds is easy, cheap and a guaranteed way of getting
the speakers to sound at least close to what they once did. Installing
third party drivers is a crap shoot, unless you can do the legwork to
find the right driver for that enclosure.

I would have thought the surrounds would have a great influence on the TS
parameters. Unless you can get identical ones.

Not usually the case. Cone compliance is often more a function of the
spider. Cone compliance is also one of the less sensitive of the T/S
parameters. As always, this is not always exactly optimal, but it is more of
a sure thing than randomly changing drivers.

"Dave Plowman (News)" wrote in message
...
In article ,
Trevor Wilson wrote:
**Replacing the surrounds is easy, cheap and a guaranteed way of getting
the speakers to sound at least close to what they once did. Installing
third party drivers is a crap shoot, unless you can do the legwork to
find the right driver for that enclosure.

I would have thought the surrounds would have a great influence on the TS
parameters. Unless you can get identical ones.

**Not so much. A sealed enclosure is more forgiving of surround differences.

Trevor Wilson