Magnepan 1.7 crossover capacitor improvement?


In my never ending quest to eliminate "glare" from all components I've recently realized that my MG 1.7's are a contributor. The crossover caps in them are nothing to write home about, a mixture of non descript caps including an Axon totaling 116.8uf in the mid range and an additional 10uf Axon for the tweeter. Since Axon is basically Solens which does have glare issues, I'm ready to move on. After snooping aroud it sounds like a mixture of Clarity ESA series/ 250V + Mundorf supreme replacements in the mid range and Mundorf Supreme for the tweeter would be a good choice. But i'm curious if someone here has already trod this path and found a different path thats reasonably affordable ( not Duelends and Vcaps...grin)
At this point I have glare about 95% tamed but there are still certain CD passages that cause that chalk board scraping sensation.
128x128davide256

Showing 5 responses by silveraudio

What is the rest of your system? What cables are u using? How close are the 1.7's placed to rear wall and side walls?
One cap at a time. I think the cap last in line before it goes to the mid panel is a 6.8 Axon. That is the cap u might try first. A safe bet would be to try a Sonicap. They are very neutral, fast and provide very good resolution at a reasonable price. The last cap in the parallel connection is quite influential on the sound. That may do the trick.

As for the tweeter cap, I would bite the bullet and get a Mundorf Silver Oil. It is expensive but I believe u will end up with a speaker that will compete with just about anything out there.

Do it once. Do it right.

Please remember though, a well done Maggie 1.7 can't help a shitty source, weak amplification and crappy cables. Everything should be up to the task before you season to taste.
I forgot to ask. How hard is it to get the sock off of the 1.7's without destroying it? I want to change out the inductor and a few caps myself but I don't want to trash the speakers sock in the process.

Thanks in advance.

Joe
I completely agree with Larry. Some caps go through their changes for up to 400 hrs. Teflon can take up to 600hrs to settle down.

As stated earlier, change one cap at a time and let it cook as Larry has suggested. You might even consider taking out that iron core inductor and dropping in a 16 gauge 1.4mh Goertz coil. They are expensive but worth it. As Larry can attest, the use of well placed coils , caps and resistors can take u quite far with an already well done design.

Good luck and any suggestions on cloth removal for the 1.7's would be appreciated.

Thanks.

Joe
Hey David. Thanks for the detailed response. I really appreciate that.

One thing I'd like to mention though. While I really like Mundorf caps, I have never had success with the Supremes. I have used them on tweeters and I've used them as coupling and interstate caps. They exhibit good clarity but they can sound very slightly dry. Not bright just stark. However, the Mundorf silver oil is a favorite of many an audiophile. They have tremendous clarity with superb treble clarity and body that never becomes intrusive. I've never not had success with them in any application. That's not to say I think they are the best for every application but they are never embarrassed by anything.

If your budget allows go for the silver oil. If not, try a Supreme bypassed with a 1uf silver oil. Don't bypass with to small a value as that is the trend now days but it is detectable in most instances. Not all but most. You might eventually try a 9uf Sonic Cap bypassed with a 1uf silver oil on the tweeter.

Good luck and I'll be waiting to hear what you decide and what you feel the results are.

Best of luck and thanks again for your help.

Regards,
Joe