Optimus Pro 7 tweaks?

DigitalJunkie · 1st January 2011, 01:11 AM

Hey guys,

I just dug out a pair of these Optimus PRO 7's,and was wondering if there are any common tweaks,etc for them? I've searched the forum a bit,but found mostly 're-builds' with new drivers,etc.
Mine have a 4.7uf 50V bi-polar electrolytic caps in series with the coil/tweeters,with the 0.4mH coil in parallel with the tweeter.

I have some 4uf and 5uf 200V film caps here. Thinking of soldering in the 5uf caps,as the first 'tweak'.
More stuffing in the boxes might be the next thing to try.

Any other thoughts?

I've put some pics of them (inside and out) up at:
OptimusPro7 pictures by Nothing40 - Photobucket

Moondog55 · 1st January 2011, 01:58 AM

Seem to remember a few threads, mainly replacement of the cap with good quality and using more fiber filling, although i seem to recall a substitute tweeter using the old Vifa D25NC

DigitalJunkie · 1st January 2011, 04:38 AM

They don't really sound too bad stock,there's no low end,but everything else is pretty okay. I may replace the caps later tonight. Perhaps I can find some more 'fluff' to stick in them too.

DigitalJunkie · 1st January 2011, 11:51 PM

Initial impressions after replacing the caps,and stuffing the enclosures with a couple handfuls of poly-fill type stuff - Thumbs up!

There's a hint of lower frequencies now,and the lows/midbass seems to have filled out a bit.
The caps made a somewhat equal improvement in the top-end,it seems a bit..cleaner sounding. Imaging might be a tad better now too? Hard to tell.
Overall kind of a subtle change,but certainly for the better IMO..and it was cheap (free) and easy.

Moondog55 · 2nd January 2011, 12:32 AM

Subtle; cheap and easy? Best kind of modification

vdi_nenna · 2nd January 2011, 12:43 AM

There is this mod for a 77.

Parts Express DIY Project

von.ah · 2nd January 2011, 04:59 PM

There's also a thread over at AudioKarma that describes a new crossover which significantly flattens out the overall response.

1st January 2011, 01:11 AM	#1
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	Optimus Pro 7 tweaks? Hey guys, I just dug out a pair of these Optimus PRO 7's,and was wondering if there are any common tweaks,etc for them? I've searched the forum a bit,but found mostly 're-builds' with new drivers,etc. Mine have a 4.7uf 50V bi-polar electrolytic caps in series with the coil/tweeters,with the 0.4mH coil in parallel with the tweeter. I have some 4uf and 5uf 200V film caps here. Thinking of soldering in the 5uf caps,as the first 'tweak'. More stuffing in the boxes might be the next thing to try. Any other thoughts? I've put some pics of them (inside and out) up at: OptimusPro7 pictures by Nothing40 - Photobucket

1st January 2011, 01:58 AM	#2
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	Seem to remember a few threads, mainly replacement of the cap with good quality and using more fiber filling, although i seem to recall a substitute tweeter using the old Vifa D25NC __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

2nd January 2011, 12:32 AM	#5
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	Subtle; cheap and easy? Best kind of modification __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

2nd January 2011, 12:43 AM	#6
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	There is this mod for a 77. Parts Express DIY Project __________________ I build, therefore I am.

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1st January 2011, 04:38 AM	#3
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	They don't really sound too bad stock,there's no low end,but everything else is pretty okay. I may replace the caps later tonight. Perhaps I can find some more 'fluff' to stick in them too.

1st January 2011, 11:51 PM	#4
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	Initial impressions after replacing the caps,and stuffing the enclosures with a couple handfuls of poly-fill type stuff - Thumbs up! There's a hint of lower frequencies now,and the lows/midbass seems to have filled out a bit. The caps made a somewhat equal improvement in the top-end,it seems a bit..cleaner sounding. Imaging might be a tad better now too? Hard to tell. Overall kind of a subtle change,but certainly for the better IMO..and it was cheap (free) and easy.

2nd January 2011, 04:59 PM	#7
von.ah diyAudio Member Join Date: Feb 2008 Location: Baltimore, MD	There's also a thread over at AudioKarma that describes a new crossover which significantly flattens out the overall response.

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