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  • lotek
    started a topic Can I upgrade my Minimus 7's?

    Can I upgrade my Minimus 7's?

    I want to use a set of Minimus 7's that I have refurbished.
    They sound okay but is there a cheap replacement for the woofer that will make them better?
    I've already replaced the Capacitor with a new poly cap. The inductor is original.

    I don't think there's anything on the woofer.

    I see that PE sells a lot of similar drivers.
    thanks!

  • bkeane1259
    replied
    Re: Can I upgrade my Minimus 7's?

    Glad you went that route. Zilch was a mastermind. I know exactly what you're talking about with that inductor. I found that riveting them in from the backside of the cabinet worked. Lots of glue works too of course. That XO mod really wakes those speakers up. Have fun!!
    Attached Files

    Leave a comment:


  • lotek
    replied
    Re: Can I upgrade my Minimus 7's?

    I finally had the chance to install the Zilch crossover upgrade on my Minimus 7's and they sound pretty awesome!

    I had a little trouble with the clearances since the 1mH inductor is so big, almost too big. I was able to move it up a little thanks to my trusty hot-glue gun. My original x-overs use a spool-type 0.4mH inductor and I couldn't use the same layout that was suggested. However, I was able to get it all in there.

    Many thanks to all for the advice!

    Leave a comment:


  • tron
    replied
    Re: Can I upgrade my Minimus 7's?

    I am sorry lotek. I see yours are the original design. Your cabs are not ported. This is a good thing! I have another set I built with the same design and they sound great to me as well.

    todd

    Leave a comment:


  • tron
    replied
    Re: Can I upgrade my Minimus 7's?

    Someone please chime in here. I consider my self very new at this.

    I really like the Metal enclosures. I also like big sound from a small package.

    Here is what I did and it may be totally wrong but I think they sound great and will take quite a bit of power.

    I used:

    http://www.parts-express.com/pe/show...12&FTR=nd105-4

    ND105-4

    and

    http://www.parts-express.com/pe/show...number=275-030

    ND20FA

    The woofer will fit but you may have to trim the tabs a bit. The stock tweeter can be broke off the front and with a little file or sand paper you can remove enough material for the tweeter to front load through the hole. I used hot glue to hold it in.

    The port is way too small for this woofer and it is VERY audible. I stuffed it with poly fill just to dampen the air flow.

    Here is my xover. This is the first time I have ever posted something that I designed so feel free to pick it to pieces!

    todd
    Attached Files

    Leave a comment:


  • ernperkins
    replied
    Re: Can I upgrade my Minimus 7's?

    I think it's the MCM 55-1853 that Zaph used on his Bargain Mini project - it has the same pin cushion type frame as the RS woofer.

    Leave a comment:


  • michiganpat
    replied
    Re: Can I upgrade my Minimus 7's?

    search the audiokarma board for minimus 7's...IIRC there's an MCM woofer that's supposed to be a very good replacement.

    personally I'd try a dayton ND105-4 or maybe a hivi B4N

    Leave a comment:


  • johnastockman
    replied
    Re: Can I upgrade my Minimus 7's?

    Originally posted by clydethecat View Post
    Is there a reasonable replacement, for those of us who have blown ones? Do Radio Shack or Fostex offer anything suitable?
    I know of no exact replacement...probably only the original will work with the stock XO or the Zilch XO. Repairs can be done, PE offers a service, so do these guys:

    http://www.speakerrepair.com


    Trying another woofer would be trial and error, mostly error. The guys at Orange County Speaker (no relation to chopper poseurs) might even have a replacement they could suggest. Those Minimus speakers were and still are popular, so maybe someone has come up with a viable drop-in that could improve or retain the SQ. Good luck.

    John A.

    Leave a comment:


  • johnastockman
    replied
    Re: Can I upgrade my Minimus 7's?

    Originally posted by lotek View Post
    Hi Chris,

    I got these at a garage sale for $6 and they work really well.
    The woofers are 4" and have a fair hefty magnet. The tweeter is also fairly large.
    It's a 2-way and the cabinet is metal. The box is sealed and the grills are also metal. When I got them the grills were black and dented in so much so that the grills were pressing into the tweeter dome.

    I painted the grills, I like the look.
    I also upgraded the stock capacitor with a beefier poly cap and kept the stock inductor coil. I don't believe there's anything on the woofer, the cap and coil are on the tweeter.

    I'm thinking of getting a better woofer and trying a cross-over I saw on ebay, but that may not work well with a new woofer - hence my dilemma.

    Thanks to all for the suggestions. I will most likely use these with my Vintage Marantz 2238B or 2230 and a sub. I have an Infinity BU-80 that has a blown amplifier. If I can figure out how to fix that then I think these will perform well for a desktop setup.






    I had a friend who went the flea-bay XO route for his Minimus with the metal boxes...not acceptable at all. The original XO sounded better. While the stock XO was extremely minimalist, meaning it was designed for mass-production, not good SQ, anything other than that isn't an upgrade. Swapping in another woofer also leads to the same conclusion. Keep the stock drivers (if they aren't damaged) and use the Zilch XO. Much better in overall SQ. Also, he let me line the interior with Cascade Audio's peel 'n stick damping material. Noticeable improvement. Not night & day difference, but an improvement.

    John A.

    Leave a comment:


  • clydethecat
    replied
    Re: Can I upgrade my Minimus 7's?

    Originally posted by bkeane1259 View Post

    P.S. If you insist on tossing those woofers, I will buy them as long as they are not blown.
    Is there a reasonable replacement, for those of us who have blown ones? Do Radio Shack or Fostex offer anything suitable?

    Leave a comment:


  • bkeane1259
    replied
    Re: Can I upgrade my Minimus 7's?

    The real problem with that speaker is the XO -- you need to rebuild them (the XO's) first before you think about scrapping a perfectly good woofer.

    There is a serious hump around 3k and then again at 8k that the proper XO mod can tame. It makes all the difference in the world.

    All the parts can be purchased at PE for peanuts.

    Here's a link to the schematic for the Zilch project:

    http://www.audiokarma.org/forums/sho...&postcount=421

    P.S. If you insist on tossing those woofers, I will buy them as long as they are not blown.

    Leave a comment:


  • lotek
    replied
    Re: Can I upgrade my Minimus 7's?

    Hi Chris,

    I got these at a garage sale for $6 and they work really well.
    The woofers are 4" and have a fair hefty magnet. The tweeter is also fairly large.
    It's a 2-way and the cabinet is metal. The box is sealed and the grills are also metal. When I got them the grills were black and dented in so much so that the grills were pressing into the tweeter dome.

    I painted the grills, I like the look.
    I also upgraded the stock capacitor with a beefier poly cap and kept the stock inductor coil. I don't believe there's anything on the woofer, the cap and coil are on the tweeter.

    I'm thinking of getting a better woofer and trying a cross-over I saw on ebay, but that may not work well with a new woofer - hence my dilemma.

    Thanks to all for the suggestions. I will most likely use these with my Vintage Marantz 2238B or 2230 and a sub. I have an Infinity BU-80 that has a blown amplifier. If I can figure out how to fix that then I think these will perform well for a desktop setup.





    Leave a comment:


  • bkeane1259
    replied
    Re: Can I upgrade my Minimus 7's?

    Originally posted by lotek View Post
    I want to use a set of Minimus 7's that I have refurbished.
    They sound okay but is there a cheap replacement for the woofer that will make them better?
    I've already replaced the Capacitor with a new poly cap. The inductor is original.

    I don't think there's anything on the woofer.

    I see that PE sells a lot of similar drivers.
    thanks!
    I did the Zilch xover mod on several sets, all of which were bought on ebay for dirt cheap. As long as the drivers are good, the XO mod does wonders for the sound.

    On mine, I damped the woofer with a bead of silicone caulk around the magnet and also lined the stamped frame with strips of dynamat-like material. I did the same dynamat damping on the inside walls of the cabinet.

    The lack of adequate XO on those was their short-coming for sure. I highly recommend looking into the Zilch XO -- Zilch was a true DIY master.

    Leave a comment:


  • DDF
    replied
    Re: Can I upgrade my Minimus 7's?

    I just coated my woofers, replaced tweeter and redesigned xover. Fun little boxes that sound surprising good but you need to keep SPLs very (very) low.

    I heard this driver is a drop in, but never tried it:

    Goldwood 204/8 (Parts-Express 290-372)

    I used an Apex Jr tweeter that's not available any longer. IME, jettison the tweeter before the woofer. The woofer has a terrible break up off the hard dust cap so the xover needs some measurement equipment and xover sim to get sounding OK, IMO

    Leave a comment:


  • johnnyrichards
    replied
    Re: Can I upgrade my Minimus 7's?

    Yes you can, I got over 400,000 hits on Google using "minimus 7 upgrade" as a search term. It seems to be a strangely popular past time

    FWIW, I don't think there is anything really wrong with the drivers, that speakers limitations seem to be 1/2 Bose related (too small of a cabinet) and 1/2 accounting related (minimalist crossover on drivers not suitable for that design approach).

    Leave a comment:

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