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Atma-Sphere OTL & Magnepan?

Posted on January 4, 2017 at 21:05:25

Posts: 2
Location: Minneapolis, MN USA
Joined: August 24, 2011
Atma-Sphere OTL and Magnepam? Could Magi be modify to 8 ohms? I did touch base with Raph but open to discusion?


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RE: Atma-Sphere OTL & Magnepan?, posted on January 5, 2017 at 10:40:39

Posts: 8940
Location: Bethesda, Maryland
Joined: December 11, 2000
Magneplanars are akin to ribbon speakers, and ribbon speakers tend to be low in impedance. It's just the nature of the beast. Are your Maggies 2-way or 3-way speakers? If so, you might explore series connection of the tweeter and woofer sections as a way of achieving your goal. That would require the design skills of someone who is knowledgable. Otherwise, Zero autoformers are the best solution.


I would absolutely consider ZeroFormers FIRST, posted on January 5, 2017 at 14:53:48

Posts: 4966
Location: Phoenix, Arizona
Joined: December 10, 2004
December 13, 2004
See the linked page.
Tin-eared audiofool, large-scale-Classical music lover, and damned-amateur fotografer.
William Bruce Cameron: "...not everything that can be counted counts, and not everything that counts can be counted."


RE: Atma-Sphere OTL & Magnepan?, posted on January 5, 2017 at 15:15:52

Posts: 279
Location: Chadds Ford, PA
Joined: January 17, 2007
Which Atma-Sphere, and which Magnepan?

Most AS amps want at least 8 ohms, and most Magnepan are 4 ohm nominal (although the old Tympani are apparently 8 ohm nominal).

I have run an old pair of M-60s with a pair of MG10.1 and MG-IIIa using the old Atma-Sphere Z-Music transformers (which are tricky to use, there is an old thread on this), and they worked fine and sounded great.

Unless everything is a little outside the norm, the ZEROs are you best option.


He runs MA-2s. In a case like this, posted on January 6, 2017 at 09:44:06

Posts: 3309
Location: Minnesota
Joined: April 24, 2002
April 1, 2002
for best results the amp should be placed behind the speaker and the speaker cables be kept under a foot in length.

We had a guy use dual Ocos (a cable marketed by Sumiko that was a sort of coaxial speaker cable) and he ran 20 feet of cable to his Tympanis. Plenty of volume, but no bass! I had him move his amps (MA-2s) to the rear of the speakers (with the rear of the amp facing the rear of the speaker) and had him install some 6" speaker jumpers made of 8 Gauge copper. The bass came back in spades.

Making sure the connections are tight helps too!


RE: Atma-Sphere OTL & Magnepan?, posted on January 7, 2017 at 18:58:22

Posts: 2
Location: Minneapolis, MN USA
Joined: August 24, 2011
Thank you all for reply. Regarding Atma-Sphere and Magnepan, I hate to add Zero between amp and speaker. Trying to stay true to OTL. I might need to bring back my Quad 63 that had been in storage for 15 years (hope still work?) or build speaker box for University 315c since concentric drivers are coming back.


RE: Atma-Sphere OTL & Magnepan?, posted on January 8, 2017 at 10:11:27

Posts: 167
Joined: November 21, 2009
January 14, 2010
The Atma-sphere MA-1's are the best match I have ever heard with the Quad's. The combination sounds more like music than any combination I can recall. The Atma's bring out the low frequencies in the Quads.
My $0.02


RE: Atma-Sphere OTL & Magnepan?, posted on January 15, 2017 at 06:38:21

Posts: 17
Location: Oslo
Joined: November 5, 2004
I can confirm that speaker matching is centrally important to get the best of the MA-1 amps. I tested speakers and although many sounded OK they didn't sound optimal. I ended up buying Audiokinesis Dream Makers, tuned to OTL amps, and later also their LCS effect speakers. Very glad I did.


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