106 replies to this topic

[Pete B]

>So here's the scoop, Pete.
>The woofers in my 5102s are like Ed's, with a raised
>backplate.
>Front and back plates are 1/4".
>Magnet is 5/8" thick.
>There's a pair of 5012s on eBay now at $100 + shipping from
>NY.
>
>What's the big deal about a raised/bumped backplate? Allows
>longer cone excursion? Is the second question good enough for
>another laugh?

Hi Russ,

Oh, Interesting, it is different then.
Original:
3/8" plates
3/4" magnet
5012:
1/4" plates
5/8" magnet

I could enter the numbers in the spread sheet that I have,
but we'd need to know the voice coil length. Don't know
if the kept the 5/8" length, another common one is 3/4" for
these old long throw woofers. But we won't know without
looking at one. Anyone have a blown 5012 woofer?

Yes Russ the raised back plate allows the VC to move further
back before making the loud crack sound as it hits the plate.

We should probably start a new thread about the 5012 woofer.

Thanks Russ,

[dynaco_dan]

Hi Doug;

Well said, Doug, thank you very much.

This site is for those person's, whether male or female.

They come and find or add to interesting hifi write-ups and thoughts of person's from all over the world.

It is as non-commercialized as it can be.

There is a forum here, specifically dedicated to the buying and selling of one's own personnal hifi equipment.

By you posting your personnal hifi items for sale or wanted, you can be better located or we can make suggestions, rather than your items getting lost deep in other forums.

This is a, not for profit site, please do not list sale items, such as an on-going business, as you would on eBay.

There has been some attempts at Spamming here, but, Mark is on top of that issue.

[Doug G.]

>have a pair of advent speakers I was told they are worth
>money. serial number U108163 I cant find info on them and
>would like to sell but would like to be able to tell someone
>about them thank you. jo

Jo,

It is generally not a good idea to come to a forum like this, where almost all of us are truly interested in these speakers for more than just their worth, just to find out how much you can get for them. You are likely to be met with silence or indifference.

However, if your utilities are in excellent condition (no cabinet damage, perfect drivers not needing refoam, and no extraneous noises), they are worth about $100. Less if any of the mentioned conditions are not met.

Doug

[Pete B]

I think your joking but, your comment did give me a laugh!
Here's a picture of Ed's 5012 raised or bumped back plate:
http://www.classicsp..._files/1543.jpg

Here's the thread where we discussed it:
http://www.classicsp..._id=&page=#1336

I would be very interested to know the back plate, front plate,
and magnet thickness. 1/4" plates are very common, however the
original and New LA woofers had 3/8" plates. I'm curious about
the 5012 woofer if you happen to take a look.

Thanks very much for the offer about the crossover, but I
bought a pair of 5012 XOs on ebay just for curiosity sake.
There's a 7 uF from the + input to the fuse. Other end of fuse
has an inductor to ground (fairly large air core), also a
32uF to a 3 ohm resistor, other end of resistor to tweeter +.
Woofer has a not so large air core inductor in series with
the + lead, wired with positive polarity.

Best Regards!
Pete B.


>Pete—you know enough about me to know that I don't know what
>a backplate is. But if you tell me, I'll take the woofer out
>and try to find it. If it's big enough, I just might have
>lunch on it tomorrow, and even outside, if the sun shines.
>
>I have these 5012s just sitting idle. I don't want to put them
>on eBay because they never bring what they're worth. And
>they're quite good. The cabinets are just a little larger than
>the original Advent Loudspeaker, the x-over is different,
>there's no tweeter level control, and the tweeters haev fuse
>protection (which I have disabled).
>
>While I'm inside, I'll examine the x-over and note the details
>for you, so you'll have something else to think about this
>week ;-)

[Pete B]

Hi Russ,

Interesting comments regarding your comparision of the
5012 to the LA.
Do you happen to know if the 5012 woofer has a raised backplate?
We discussed this in another thread as you might have noticed.
It might be slightly better than the New LA woofer, mainly
when pushed hard.
I'd like to hear those 5012W's I'm curious now.

Best regards,
Pete B.

>Hello, gks.
>
>I have a pair of 5012W's, made during the Jensen years. To me,
>they sound exactly like the Advent Loudspeaker, though the
>x-overs are different and the cabinets are slightly larger in
>every dimension—about 1/2 inch.
>
>They never seem to draw much interest on eBay, and rarely come
>up there. So I have this very nice pair, in very nice
>condition, with new poly caps and pretty fresh woofer
>surrounds, and I'm wondering what to do with them (since I
>already have 4 Advents in a double system and two very lovely
>Smaller Advents I recovered in white birch veneer and
>refurbished with new tweeters and x-over components—AND
>resting securely on beautiful stands I made myself).
>
>If you have the answer to THAT, you most certainly ARE and
>expert, because anyone who knows what action I should take has
>to be an expert. I am expert at many things, but knowing what
>to do is not usually one of them ;-).
>
>Your original post was engaging.
>
>Best wishes.
>
>Russ Wollman
>
>

[Doug G.]

Wow! Kent's "House of Advent"!

Hey, what's that driver on top of that New Advent with the round magnet? An interloper?

Doug

[Doug G.]

By the way. If anybody wants to see some greenies with little magnets, there's a pair on eBay now.

It appears that these have the randomly canted masonite plates. They do have grilles.

Doug

[Doug G.]

An electric screwdriver will make taking all those tweeters out a lot easier. Hehe.

Doug

[Doug G.]

You are correct Bob. The lower efficiency of the Smaller Advent was mostly offset by the ability of SS amps to deliver more power to a 4 ohm load.

It's just that it doesn't appear that we can just go by diaphragm color to tell which is an "Advent Loudspeaker" tweeter or a "Smaller Advent" tweeter.

Doug

[Doug G.]

A reply from the wretched, cursed depths of aitch-e-double toothpicks.

I have used the same brochure as a guide to differentiate between the original Advent and the Smaller also. I have never seen one that stated that the tweeters were identical. Interesting.

It does kind of follow, however, some discussions that have occured about later Smallers having large magnet tweeters. Advent must have changed them somewhere along the line. I maybe be imagining this but I seem to vaguely recall something about they decided that maybe the original alignment resulted in a bit too "reclusive" top end.

A smaller magnet would reduce the sensitivity or efficiency of the driver. It takes more current through the VC to get the same excursion compared to one with a larger magnet. It's the same with electric motors. The stronger the magnet, the less current it takes to rotate the armature.

It would be interesting to find out if they changed the crossover in the Smaller Advent as they did with the original Advent Loudspeaker over the period of manufacture.

If they didn't, it would seem to support my supposition, above, that they decided that the Smaller needed more top end. If they changed the crossover at the same time as using large magnet tweeters, it would indicate that they maybe just wanted to use the same tweeter in both instead of making two separate tweeters.

Does anybody remember the serial number restrictions Advent put on the back of the replacement tweeters? I'll have to see if I can find the info in past correspondence.

Of course, this still doesn't resolve the green/orange issue because there are greenies of both large and small magnet design as Kent said. :^) I can't remember if there are both large and small magnet orangies.

I now retreat into my cursed existence where there are no caregivers to help. :^)

Doug

EDIT: Oh yeah. As Kent indicated, the impedence of the tweeter has little really to do with the impedence of the speaker system as a whole. That is more determined by the woofer and crossover.

[mrdb]

I thought that the green tweeter was used in the Smaller Advent speaker, with a 4 ohm impedance. The literature that I have talks about being able to use a smaller magnet on that tweeter (lower sensitivity and lower cost) because of the sensitivity difference between large and small woofer. Making the Smaller a 4 ohm impedance allowed solid state amps and receivers, which were plentiful by this time and likely to be used with a speaker in this price range, to deliver more power to the speaker.

Bob