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Magnepan Full-range ribbon and planar speakers

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Old 08-12-2019, 05:01 PM
Beet Farmer Beet Farmer is offline
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Posts: 115
Default Bypassing midrange fuse and all added connections for them on 20.7

I have owned my Magnepan 20.7 speakers for over a year. And finally decided to go ahead and bypass the mtdrange fuse.
Previously I owned 3.6 Maggies and after a few years had bypassd that midrange fuse. Never had any problem.
So since I am using a bundle of resistors to make 1.3 ohms or the midrange (with two PATH Audio 3.9 om, and an additional Dulund CAST 3.9 ohm in series for 1.3 ohms. I had to create a harness to keep the Duelund leads safe so I had long wires to that bundle anyway just for the future soldering into the speaker and bypassing the fuse and dozen connectors in there)
Since I had studied this before, and had done a similar thing to my 3.6 it was a breeze. So I soldered the wires from my resistor bundle using the through holes for the midrange resistor add on, inside directly to the corresponding wires exiting the under plate area
Results better midrange upper bass, and greater clarity.

I should have done it sooner! To me, the weakest stock link are the quick connectors to the fake gold tabs. and the fuse case connections. The tabs are too thin for the quick connector. IMO anyway.
Yes there may be warranty problems if for some reason the midrange melts..
But I do not play anything loud enough to even get close...
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Old 08-12-2019, 06:19 PM
nicoff nicoff is offline
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Default Bypassing midrange fuse and all added connections for them on 20.7

Glad that you can play them without the fuse. I blew so many fuses (both of them) that not having mid-range fuses would be a no-no for my listening habits. Come to think of it, quite a few times I blew both the ribbon tweater AND the fuse. It became a habit to check the fuses and the ribbon Everytime after I listened to music 'loud'.

Last edited by nicoff; 08-12-2019 at 06:22 PM.
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Old 12-27-2019, 05:08 PM
6dj8 6dj8 is offline
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Location: Minnesota USA
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Default

On my 3.6 and IIIas I replaced the mid and twitter fuses with copper tubes. Have done this for decades with no twitter or midrange failures.

Got improved midrange and high frequencies.

The fuses are for very, very loud listeners (I play no peaks above the low 90s dB wise), or those that drive their amps into clipping.

I do not want to ruin my hearing, and am not a head banger.

Last edited by 6dj8; 12-27-2019 at 05:14 PM.
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