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Old 25th April 2013, 12:41 PM   #101
tyu is offline tyu  United States
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From the Sound output chang from just puting new foam on the top an bottem rails...
Baybe 1-2db more output....... i well try foam to stop buzzing .....silicone well be the last thing .....right befor i sale them....I have had the Duetta Sg an miny Stages befor... To bad Magnepan had to give Jason such a bad time....I can see any thing like a Magnepan in a Apogee driver... but thay bouth use magnets..
I think if Jason had been abel to make the Duetta Bass like the stages with the rounded cuts in the foil....an not just the Horizonel sharp lines cut into all the other basses.....It would have made all fall into place sound wise....
but this is just one Diy Nutjobs thinking....
Thanks for any an all info on Apogees
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Old 26th April 2013, 04:43 PM   #102
taotao is offline taotao  Germany
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Default tuning bass

Hi John, I'm glad you managed to cure your Apoges.
The low frequencies, they deliver, are outstanding.
With mine I use a Vincent amp (SP-331), very powerful and tight sounding bass.

About the little rest of buzz, you've got; sometimes the cover can produce sounds. Maybe try some clamps to verify if they still buzz. If yes, put something under the cover, that damps (very thin rubber plates or something similar).

Maybe I try if mine have this buzz at the frequencies you mentioned. I'll inform you.

But you can do me a favour, too :-)
Please send me this document, describing the tuning procedure, I can't find it now.
Maybe I'll retune mine (but on the other side, they sound good the way they are....)

Oh, one more thing to mention:
The stiffness of the body is not the best. I raised it by mounting three bars made of steel at the backside (at the top, middle and bottom). I screwed the bars horizontal onto the mdf board. Of course, being very carefull not to damage something inside.

Maybe later, I'll send pics.
@Tyu:
You are right about the stage, I had them, too. They have really nice midrange.
But the fundamental resonance of the bass panel is so high that a lot of music is affected.
With the duetta, the resonance is lower and spread over a certain range (tuning of the panel)
About upper mids, mine are fine. I can,t say, that they lack resolution. Before I applied the silicone, my speakers were not listenable.
See you

Last edited by taotao; 26th April 2013 at 04:49 PM.
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Old 26th April 2013, 05:05 PM   #103
Davey is offline Davey  United States
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I have a copy of the tuning procedure John is referring to....I think. It's too big to attach to a message here, but you can PM me and I will send.

Cheers,

Dave.
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Old 26th April 2013, 05:07 PM   #104
john65b is offline john65b  United States
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Default Tuning

Yes, it is 3mb. I can post it on my server too....I will do that.
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Old 26th April 2013, 05:37 PM   #105
john65b is offline john65b  United States
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Here it is. The file is in German (hey, here's that German thing again!!). It shows a typical tear down and re-installation of new ribbons and bass panels (now if you could only get someone to sell you the bass panels...)

At the very end of the pdf, you will see info on tuning. Most of you may already have this file, but it was relatively new to me. and helped me understand how the Duettas were made.

http://suburbansurvey.no-ip.org/manual.pdf
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Old 26th April 2013, 05:46 PM   #106
taotao is offline taotao  Germany
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Thanks a lot guys.
Have nice time.

Hey John, your new signature is funny....
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Old 26th April 2013, 05:51 PM   #107
Davey is offline Davey  United States
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Yeah, that procedure is from just a few years ago.
I have the old, original Apogee procedure if you're interested. It is very dated with regard to test equipment and procedures but the basic information regarding the woofer tuning frequencies is still, of course, valid.

Cheers,

Dave.
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Old 26th April 2013, 05:54 PM   #108
john65b is offline john65b  United States
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I would be interested in it to Davey....
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Old 26th April 2013, 05:57 PM   #109
tyu is offline tyu  United States
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Thanks john ....Nice to see this work!

As for the point about the Apogee Stages there are mods ....an one is to chang the crossover on the bass panls a littel....cut the 80mf to 40mf...an put a Zobe in parel like a 1ohm 50watt to neg...an a 20mf cap to pos....some say this pull the Stage out front of the Duetta Sg....I well let other makeup there mind?
The Zobel is a good thing ...these big panels are great RF&AM FM antas....
I have the Duetta Sg an the Stages now so i can move things around...the bass well alway go low with the duettas ....but that can be dealt with...the duettas bass was what sold me in the 90s....but it has a cost in the uper mid...
An i get all points if the speaker dont work the FIX is a must ...are you can just give them away like the guy i got my Duettas from...most cant live with the buzz an the size....
thanks for any an all info on Apogees.
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Old 28th April 2013, 10:54 PM   #110
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So can the bass panels be repaired? In the German PDF it looks like the original bass ribbon was destroyed in the disassembly process. I have a pair of Calipers and one has a very loose bass panel and I was wondering if it could be retensioned.
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