Large Advent Cap size?

[ZeroG]

Well, I spent some time in the wee hours reading the Advent pages and am a little more hyped up than I was before about these NLAs. I happen to like KLH and have 17s and sixes and 32s, so I wanted to see what all the hype is about.

One of the interesting things I picked up is that the drivers are the same as my set of Advent /1 speakers which I refoamed a year ago and are used somewhat regulary in my shop, so I can switch the woofers for a quik check.

I can also say I didn't like the /1 at all after recapping, a tad bright but way too harsh in the upper mids, but they settled down and all in all I like them.

I've rebuilt at least 8 or more pairs of NLA and a couple of OLA, and the film cap makes a major difference. Never bothered with the inductors - wire coils don't change much. Resistors are cheap, so for peace of mind might as as well change 'em. But once the caps open up and the foam breaks in a little they sound so much smoother and the tweeter was way less shrill. I've used Solens, Bennics, and the plain old Dayton from PE. The Solens was the brightest of the bunch, and I think Bennic=Dayton (but no proof on that). The Daytons sounded just fine, and I wouldn't bother with anything more esoteric.

The incremental improvement (if there is one) wasn't IMHO worth the $$$ for Mundorf, Wondercap, Kimbercap and all that. Maybe for an equally esoteric and high end speaker, but the Advents sounded just fine to me with the Daytons.
YMMV.

 

[CT Jim]

Here is a pic of what I have. So my green tweeter from a Smaller Advent may be different than the green tweets in the NLAs?
I will check that next time I work on the caps. Also, these are the vinyl cabs although they are in very nice condition. Would have been nice if they were bullnose....maybe next time if I like the sound!

 

[Doug G.]

Yup, by golly, that's a New Advent tweeter in green.

Doug

 

[heyraz]

Pete B:.
When did they start using "Ferro Fluid" with the tweeters?

 

[Doug G.]

Ferro fluid began with the New Advent tweeter.

Doug

 

[CT Jim]

Alright, I have to ask....they started with the green ones...or the red? With ferro-fluid that is!

 

[joeinTO]

:scratch2: A first for me seeing an NLA with that colour flush-mount tweeter. Quite rare I would think.:yes:

Here is a pic of what I have. So my green tweeter from a Smaller Advent may be different than the green tweets in the NLAs?
I will check that next time I work on the caps. Also, these are the vinyl cabs although they are in very nice condition. Would have been nice if they were bullnose....maybe next time if I like the sound!

 

[CT Jim]

So is the green better than the red? Are they the same, just different color? And what about the ferro-fluid?

 

[Doug G.]

I am now convinced they are the same. The green dye was originally used on the Smaller Advents to easily identify the Smaller Advent tweeter which had a smaller magnet in it to match the efficiency of the Smaller Advent woofer.

In the factory, the assembler could just look for the right color cone instead of having to look at the magnet which, even though the original Smaller Aadvent magnet is 2.5 inches square instead of 3 inches square, is not that apparent without the two being side-by-side. It would avoid mistakenly putting the wrong tweeter in any given speaker.

As I said, later, Advent began putting the same tweeter in both systems and I believe they just used up the green cones on larger magnet units and then switched back to red. As to why there are New Advent tweeters with green cones, they either ran out of red dye and used green in its place for a time or they found some green cones somewhere and decided to use them.

Ferro fluid use is a separate issue and all New Advent tweeters had/have it.

Doug