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alex-mayer 6th November 2007 09:38 PM


I just bought (via ebay) a pair of Mission 780 ARGONAUT loudspeakers in perfect condition.

I liked them very much in the late eighties but could not afford them as I was a student.

In those days, as far as I know, Mission and Cyrus still belonged together.

Now here in Germany I cannot get any information on the Argonaut.

Therefore may I ask, if anybody here can provide me some information as for example a scanned copy a an Argonaut test, product information or maybe a crossover scheme (as I might try to upgrade the parts in the frequency crossover).

I would be happy for any information and help.

Many greetings from southern Germany,
Alexander :)

The Argonaut I am speaking of is the floorstander with two 8" bass drivers an one tweeter in between (in a dĀ“Appolito configuration).

sreten 7th November 2007 09:41 AM

d'Appolito ? I think not ..... ;)/sreten.

Sonusthree 7th November 2007 02:52 PM

There is an MTM version. They were longer (proper) floorstanders and they had the old rectangular Mission tweeter between two 8" drivers.
Perhaps Sreten's picture shows the 780a?

All I have to offer is a link to bi-amping instructions:

It's nice because it shows them being wired to the early Cyrus amps (One or Two).
I have some Early Cyrus gear and I'd love to hear how that sounds. :D

Good luck,

Edit: There's also a manual for the 780 Argonaut on that site but you should check the last page of the manual to be sure that the measurements (Height) are the same as yours.

alex-mayer 7th November 2007 09:40 PM

2 Attachment(s)
Hello Sreten, hello Sonusthree, hello @ all,

well, there are several different LS under the name of "Argonaut" as I had to realize now.

The one that I have bought, ist this one (see picture).

It should be the "final" model dating from the mid/late eighties.

Thanks for the link to the manual.

I would be glad about further information (tests, reviews, crossover scheme etc.) anybody might have for me.

Many greetings from southern Germany,
Alexander ;)

alex-mayer 7th November 2007 09:58 PM

2 Attachment(s)
.... well, and here is the picture.


gnerv 9th November 2007 12:49 PM

Hi Alex Meyer

I“ve bought my self a pare if those speakers in august this year. i am veary pleased but im not so experienced in Hifi.

What do you think of the mission 780 argonaut ? if you compare whit speakers from today what speakers will that be.


alex-mayer 10th November 2007 12:02 AM

Hello gnerv,

well, I must admit, that I was shocked, when I listened for the first time some days ago to this louspeaker.

Where was the development in the past 20 years in ls develpoment?

This Mission Argonaut sounds liveley, quick, goes quite deep with a clean bass, has precise stereo focus, splendid colours, good dynamics, crisp and "open" highs.

Maybe there are today some tweeters that will offer slightly better resolution, but all in all this is a speaker that will very well compete in the 2.000 - 4.000 Euro range.

The next thing I will do is to check the crossover.

I am certain that this ls will benefit from new (i.e. modern) capacitors as at first glance, I“d say that in the crossover there are only MKTs of medium quality incorporated.
Exchange them against a good (or: very good) MKP capacitor, and the upper medium and the highs will improve in quality.
That is at least, what I have experienced with similar loudspeakers in the past.
I would be surprised, if the Argonaut would react differently here.

As far as I could see, there is one 4.7 uF and one 5.7 uF (4.7 + 1) per box in the crossover network.
So the tuning price will be -depending on the cap you choose- 15 to 80 Euro per box.
That low enough to give it a try....
I will keep you informed.

Many greetings from southern Germany,

I would be still happy on any information on the Argonaut.... ;)

gnerv 10th November 2007 08:13 AM


I got an email-adress to mission at work. i asked them if they have any spareparts.

i give you the email on monday because i had this small conversation from my work email.

alex-mayer 10th November 2007 11:15 AM

Hi gnerv,


Thank you.

Have a nice weekend,
Alexander ;)

gnerv 10th November 2007 04:49 PM

2 Attachment(s)
if you succeed whit this modifikation so please tell me how to do it. and some pictures to show me how.
if its possible :)

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