LARGE Advent tweeter replacement

[Doug G.]

eBay. And yes, the one on the left, above. The Advent/1 uses the same drivers as the full size New Advent.

Doug

 

[KentTeffeteller]

What is it about Advent tweeters?? I had a set of 2 way large ones in the 80's, cooked the tweeters and at the time,
sold em for some new Bostons, that were great till they caught the foam disease...last good speakers that I bought..(yes i'm due)
Daily driver (no pun) is a classic Stephens 106ax, 50 or so years old with original tweeter.

My pair still has the original 1974 fried egg tweeters. They did get refoamed 20 something years ago.

 

[Doug G.]

I have never blown an Advent fired egg. Just don't abuse them. Don't drop a needle. Don't play records with inch deep scratches in them. Etc.

Doug

 

[drumbum]

I have never blown an Advent fired egg. Just don't abuse them. Don't drop a needle. Don't play records with inch deep scratches in them. Etc.

Doug

What gram vinyl do you have Doug? Must be pretty thick. LOL

 

[Doug G.]

All my records, since the sixties, have been custom-made for me. Their weight is not measured in grams. It's measured in pounds (kilograms).



Doug

 

[Vhaldo]

Hello all! Need some help/advice.

I have a pair of the OLA. Recently found a set of tweeters (pic below) that are still in the mail and all I have is this picture. I'm not sure which iteration of the advent speakers they belong to but possibly the bullnose ones.
I planned to have these as spares for the OLA but just yesterday found a pair of advent with everything in them EXCEPT for the tweeters! I thought they were large advents and could install the tweeters and have a complete second pair to stack them. Drove 2 hours round trip. Once there in turns out they are not large advent but the advent/1 which I believe are what some calle the New Small Advent.

These tweeters look just like the "fried egg" tweeters in the OLA but are dark colored, not red.

Question is: which version do these belong to and would it be ok to use them on the NSA cabinets?

Any help would be greatly appreciated. Thanks!

 

[Doug G.]

They belong to either the original Advent Loudspeaker (OLA) or the original Smaller Advent Loudspeaker.

Measure the square magnet. If they are 3" square, they can be used on all OLA's and later Smaller Advents from sometime in 1975. If they are 2.5" square, they can be used on earlier Smaller Advents

Originally, Advent used the smaller magnet tweeters on the Smaller Advents to match the tweeter efficiency to the woofers so the system wouldn't be too bright. They colored the cone green for easy identification. The OLA tweeters were the usual orange.

Sometime, in 1975, Advent decided to use the larger magnet tweeters in both models and changed the crossover in the Smaller Advents to match the efficiencies instead of the smaller magnet tweeters.

They had green cones left over from the earlier tweeters and used them on the large magnet tweeters until they used them up. So, for a period of time, from about the middle of 1975 on, green tweeters can be found on both OLA's and Smaller Advents (I have a pair of OLA's with green tweeters).

So, if your tweeters have 3" square magnets, you're all set for an OLA or later SAL. If they have 2.5" square magnets, they are meant for the earlier Smaller Advents and you would need a crossover change in an OLA to use them in an OLA or later SAL. I wouldn't want to do that. I would get some 3" square magnet tweeters instead.

The Advent/1, which you are calling NSA, uses a different tweeter, the same as in the New Advent Loudspeaker.

Doug

 

[Vhaldo]

They belong to either the original Advent Loudspeaker (OLA) or the original Smaller Advent Loudspeaker.

Measure the square magnet. If they are 3" square, they can be used on all OLA's and later Smaller Advents from sometime in 1975. If they are 2.5" square, they can be used on earlier Smaller Advents

Originally, Advent used the smaller magnet tweeters on the Smaller Advents to match the tweeter efficiency to the woofers so the system wouldn't be too bright. They colored the cone green for easy identification. The OLA tweeters were the usual orange.

Sometime, in 1975, Advent decided to use the larger magnet tweeters in both models and changed the crossover in the Smaller Advents to match the efficiencies instead of the smaller magnet tweeters.

They had green cones left over from the earlier tweeters and used them on the large magnet tweeters until they used them up. So, for a period of time, from about the middle of 1975 on, green tweeters can be found on both OLA's and Smaller Advents (I have a pair of OLA's with green tweeters).

So, if your tweeters have 3" square magnets, you're all set for an OLA or later SAL. If they have 2.5" square magnets, they are meant for the earlier Smaller Advents and you would need a crossover change in an OLA to use them in an OLA or later SAL. I wouldn't want to do that. I would get some 3" square magnet tweeters instead.

The Advent/1, which you are calling NSA, uses a different tweeter, the same as in the New Advent Loudspeaker.

Doug

Thanks a lot! Really covered all my questions and more. I should have them by Tuesday at the latest. Until then I will know for sure.

 

[Doug G.]

I forgot to mention that the definitive way to tell, in a Smaller Advent with the tweeter missing, if it should have a small magnet tweeter or large magnet tweeter is to look at the crossover. I forget, now, the values of caps, but the crossovers are different.

The earlier cabinet opening for the tweeter would not be large enough for the larger magnet to pass through but I would go by the crossover.

Doug

 

[Vhaldo]

Definitely the wrong tweeters for the cabinests I have - Advent/1. Should have done some research before hand. Oh well.

These are the green tweeters with the smaller magnet. Although they DO fit in, I don't think they would sound right due to the difference in the crossovers.

I have searched the web looking for the right ones with no luck so far. I see the right ones are pointed out in the above comments.

 

[Doug G.]

The Advent/1 uses the same drivers as the New Advent. The tweeter in still an orange cone unit but the cone is mounted flush onto a metal plate and not on a Masonite square. It also has ferro fluid in it.

Doug

 

[Vhaldo]

Thanks man! I'll keep an eye on those

 

[KentTeffeteller]

New large Advent with the BULLNOSE cabinet use a different tweeter than the Original large Advent.

Is the OP's good tweeter mounted on masonite?

Great question to ask. Wonder if Bullnose cabinets used different tweeters or if it was a production change and both used them if later than my 1974 Utility Advents.

 

[KentTeffeteller]

All my records, since the sixties, have been custom-made for me. Their weight is not measured in grams. It's measured in pounds (kilograms).



Doug

Do you own an Apature Koce Moving Coil cartridge to play those special Kilogram pressings? (LOL), are any of them colored vinyl (like White) or (Green which looks like Acapulco you know the rest). ROFL!!

Lastly, are any of these Cheech y Chong LP discs?

 

[Doug G.]

Great question to ask. Wonder if Bullnose cabinets used different tweeters or if it was a production change and both used them if later than my 1974 Utility Advents.

The New Advents never had the same tweeters as the original Advents. The original Advents had the orange cone with the Masonite square and the New Advents had the orange cones mounted flush with the metal backing plate.

I guess I could have worded it that none of the original Advents ever had the new tweeters, either. They used the Masonite square tweeters right up to the end of production in 1977-78.

The difference in the construction of the speaker boards dictated the use of one or the other.

Doug

 

[E-Stat]

The New Advents never had the same tweeters as the original Advents…

The difference in the construction of the speaker boards dictated the use of one or the other.

That and they were ferro fluid cooled for higher power handling.

I use a 300 watt/channel Ncore amp for mine in the garage system.

 

[hornbostel]

Ol

I forgot to mention that the definitive way to tell, in a Smaller Advent with the tweeter missing, if it should have a small magnet tweeter or large magnet tweeter is to look at the crossover. I forget, now, the values of caps, but the crossovers are different.

The earlier cabinet opening for the tweeter would not be large enough for the larger magnet to pass through but I would go by the crossover.

Doug

Older Smaller Advent has green tweet. The capacitors in the crossover are a 8 and a 16 uF. Properly restored these are fantastic! I currently run my pair in my work office driven by a Proton D940 receiver.

 

[hornbostel]

The Advent/1 uses the same drivers as the New Advent. The tweeter in still an orange cone unit but the cone is mounted flush onto a metal plate and not on a Masonite square. It also has ferro fluid in it.

Doug

Advent /1 tweet looks like this.