myu701
Vintage futurist
I had a roommate back in college who swore by his Minimus 7's. They were scratched up and dented, but still put out a very decent sound. Compared to my larger Polk Audio 5's at the time, I thought the smaller M7's were just OK. But later on, I heard them on another person's system and was very impressed.
Over the years since then, I'd hear a little blurb about the Minimus 7's and how great they were in the day (before the downfall in the 1990's). And in the back of my mind, I'd often thought about getting a pair. What held me back is that I just wasn't convinced they were really all that great, and that other speakers of a bit more cost would sound better. That is, until I found Zilch's thread on the crossover upgrade.
So... now I'm convinced I should get a set and try out this upgrade. Except for one major problem. My electronics knowledge and soldering skills are really novice. At best, I'm most comfortable with desoldering a component and soldering a new one in its place. Creating a whole circuit from scratch feels rather daunting. I'm wondering if I have all the posted material I'll need to undertake something like this. So, I pieced together all I could find... Please let me know if there's anything I'm missing that might help? Thanks!
PZ 2.1 M7 crossover mod
Parts List
Hand Drawn Diagram
PZ 2.1 Circuit Diagram
Comparison Circuit Diagrams
Crossover assembled
Crossover installed
Crossover Assembly Guide
Examples By AK Members
Over the years since then, I'd hear a little blurb about the Minimus 7's and how great they were in the day (before the downfall in the 1990's). And in the back of my mind, I'd often thought about getting a pair. What held me back is that I just wasn't convinced they were really all that great, and that other speakers of a bit more cost would sound better. That is, until I found Zilch's thread on the crossover upgrade.
So... now I'm convinced I should get a set and try out this upgrade. Except for one major problem. My electronics knowledge and soldering skills are really novice. At best, I'm most comfortable with desoldering a component and soldering a new one in its place. Creating a whole circuit from scratch feels rather daunting. I'm wondering if I have all the posted material I'll need to undertake something like this. So, I pieced together all I could find... Please let me know if there's anything I'm missing that might help? Thanks!
PZ 2.1 M7 crossover mod
Parts List
Hand Drawn Diagram
PZ 2.1 Circuit Diagram
Comparison Circuit Diagrams
Crossover assembled
Crossover installed
Crossover Assembly Guide
- A cable tie secures the 3-Ohm resistor to the stock aircore inductor.
- A short piece of wire (blue) connects IN (-) to the junction of the 40-Ohm resistor and 4.7 uF capacitor, lower right.
- All other connections are made using the respective component leads.
- The large inductor lead and tweeter wires dress neatly through the center of the stock aircore.
- A #4 solder lug installs on the existing plastic boss, upper right.
- Drill the rear panel to mount the large inductor between the two bosses on the inside centerline using #4 machine screws from the outside.
- Double-stick foam tape secures the two caps and bottom two resistors to the stock input terminal plate/cup. Epoxy and other glues are suitable alternates.
Examples By AK Members