Would anyone know, the DC resistance for the main driver, and the impedance
of the main driver used in the Advent Legacy II speaker box?

I know that the total speaker unit is rated at 6 ohms. I need to know the
bass driver's DC resistance.

Thanks.

--

Jerry G.
======

On Sep 2, 6:54 am, "Jerry G." wrote:
Would anyone know, the DC resistance for the main driver, and the
impedance
of the main driver used in the Advent Legacy II speaker box?

I know that the total speaker unit is rated at 6 ohms. I need to
know the
bass driver's DC resistance.

Thanks.

--

Jerry G.
======

Most of Advents speakers were 8 ohm impedance with the notable
exception of the 'smaller Advent loudspeaker' which was a 4 ohm
system. I have 2 old 'larger Advent' woofers in need of foam. The
voice coils read 4.97 and 4.92 ohms with a Fluke 8060. And no, I'm not
interested in selling them.

GG

I have a pair of Legacy II and a pair of Prodigy II. I sent out all the
drivers for rebuild. On the instruction sheets that came with the boxes,
they indicate 6 ohms. I was curious about the driver DC resistance. I don't
have them with me at this time to take a reading.

I am using the Legacy II which is a 10 inch driver as the bass speaker. I
stack the Prodigy II on top to form a column, which is an 8 inch driver. I
have them bi-amped with 2 Crown PowerTech II amplifiers via an electronic
crossover. I use the smaller box for the mids and highs. I use the larger
box for the bass drive. I equalized them for the room using an Ashley
parametric EQ with phase compensation, and an acoustic spectrum scope. I
rewired the inside of the boxes with Belden AWG #12, and rebuilt their
internal crossovers, I feed them with Belden AWG#10 from the amps. I am able
to get a total frequency response down to less than 30 Hz, and clean up to
about 24 kHz within a few Db. The THD was measured at less than 3%. The
amps are over 300 w/CH at 8 ohms with a damping of more than 1200.

I listen mostly to opera, classical, and jazz. The performance sounds like
it is live in the room! My listening room is 26 X 16 feet.

The speaker rebuilder told me that the foam will rot in about 6 to 10 years.
I asked about using another type, such as a rubber base. He told me that it
will change the accuracy of the driver from its original design. He
suggested to stay with the foam to have the original specs, and put up with
getting them rebuilt again.

For the specifications that these speaker boxes can put out, they were very
reasonable in their price. These boxes are very well constructed, and with
the proper set-up, they can put out very accurate and very re-enforced
sound.

--

Jerry G.
======


wrote in message
oups.com...
On Sep 2, 6:54 am, "Jerry G." wrote:
Would anyone know, the DC resistance for the main driver, and the
impedance
of the main driver used in the Advent Legacy II speaker box?

I know that the total speaker unit is rated at 6 ohms. I need to
know the
bass driver's DC resistance.

Thanks.

--

Jerry G.
======

Most of Advents speakers were 8 ohm impedance with the notable
exception of the 'smaller Advent loudspeaker' which was a 4 ohm
system. I have 2 old 'larger Advent' woofers in need of foam. The
voice coils read 4.97 and 4.92 ohms with a Fluke 8060. And no, I'm not
interested in selling them.

GG

On Sep 2, 9:31 pm, "Jerry G." wrote:

snip
The speaker rebuilder told me that the foam will rot in about 6 to
10 years.
I asked about using another type, such as a rubber base. He told
me that it
will change the accuracy of the driver from its original design. He
suggested to stay with the foam to have the original specs, and put
up with
getting them rebuilt again.

For the specifications that these speaker boxes can put out, they
were very
reasonable in their price. These boxes are very well constructed,
and with
the proper set-up, they can put out very accurate and very re-
enforced
sound.

--

Jerry G.
======

I had read somewhere that the foam breakdown is from fungus. The new
foams supposedly have fungicide to slow that process. The first pair I
re-foamed about 5 years ago and as of now, show no visible signs of
rot and more importantly, they don't have that dampish crumbly feel.
Best part is they sound great.

That foam kit came with replacement dustcaps and clear plastic shims
to put in the voice coil while working on the surround. These are the
_old_ drivers with the masonite rings to reduce the driver size while
allowing a cheap stamped basket back in '73. I removed the masonite by
heating the edge with a hot air gun to removed all the old junk and
mount the new foam the same as the original. The masonite was
originally held in with contact cement but I used silicone bathtub
caulk from frame to masonite and white latex to hold the foam to the
ring and the cone. A bucket load of spring clothepins held the outside
in place as the silicone cured. Took maybe an hour per driver but 24
hrs for the adhesives to be done. Later kits (total of 6 units -- I
have 8) were done without the shim and dustcap replacement in even
less time. They work fine also. The original driver to box seal was
Mortite - rope caulk but the DAP product is fine.

GG

In article , "Jerry G." wrote:
I have a pair of Legacy II and a pair of Prodigy II. I sent out all the
drivers for rebuild. On the instruction sheets that came with the boxes,
they indicate 6 ohms. I was curious about the driver DC resistance. I don't
have them with me at this time to take a reading.

Generally, the bass driver has the lowest Z. With a nominal 6 ohms, 4 to 5
ohms DC resistance sounds typicaly right.

greg