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Old 22nd January 2006, 07:04 PM   #1
NV&H is offline NV&H  United States
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Default Perfect Speaker for Current Source Amps?

With a true current source amplifier, would one not just need a single turn of wire on the speaker voice coil, albiet, a much thicker one?

If so, seems like inductance would (happily) vanish.
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Old 22nd January 2006, 07:14 PM   #2
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Maybe yes, but you would also need an amp that could deliver extremely high current into a virtual short. Like an amp that could deliver +/- 100 amps @ 5V or something like that. Doable, not simple.

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Old 22nd January 2006, 10:57 PM   #3
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100 amps hehe you guys got to be joking...
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Old 23rd January 2006, 01:18 AM   #4
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If you're in the business of designing the driver from the ground up, use niobium magnets or whatever is top-o'-the-walk these days. That would increase efficiency considerably over ceramic or Alnico magnets. Expensive, but necessary if you intend to give this a fair chance.
The planar drivers approach this. Each diaphragm has only a single, or sometimes double wire (also to include flat aluminum conductors) with what is for all intents and purposes a dedicated magnet. They're low resistance, and have virtually no inductance or capacitance.
The Magnepan direct drive ribbon accomplishes exactly what you're describing. It's a single linear conductor in a magnetic field...that's it. The resistance is on the order of 2 to 2.5 Ohms. Granted, there's no cone attached; the 'voice coil' is the cone, so to speak.

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Old 23rd January 2006, 05:35 PM   #5
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Default Re: Perfect Speaker for Current Source Amps?

Quote:
Originally posted by NV&H
With a true current source amplifier, would one not just need a single turn of wire on the speaker voice coil, albiet, a much thicker one?

If so, seems like inductance would (happily) vanish.
With a current source, the inductance of the voice coil vanishes
regardless.
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Old 23rd January 2006, 05:59 PM   #6
MikeW is offline MikeW  United States
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The F1 drives the magnepan MMG much better than expected.
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Old 23rd January 2006, 11:05 PM   #7
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Quote:
Originally posted by MikeW
The F1 drives the magnepan MMG much better than expected.
I expect that with the Maggies, the issue is mostly power.
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Old 25th January 2006, 08:18 PM   #8
Sandor is offline Sandor  Italy
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Default F1 driving MMGs

Do you think that the F1 can drive a pair of MMGs in my 13 x 16 feet living room? I experienced that a 300B tubed single ended (7-8 W) has not enough power. Or should I say that it has not enough CURRENT?
Now I drive my MMGs with a 300W/4 ohm solid state amp, but I am afraid that sometimes it clips (!!!).
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Old 25th January 2006, 08:44 PM   #9
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The most dramatic case for a current source amp I have heard
is a Lowther DX55 in a sealed box and with a bit of loading
EQ. The differences were not at all subtle, more on the order
of night and day. As you move away from that type of driver
and box, the arguments for a current source become weaker,
and by the time you are running 85 dB woofers in a bass reflex,
you are probably better off with a voltage source.
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Old 25th January 2006, 08:57 PM   #10
Sandor is offline Sandor  Italy
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Nelson,
from the electrical an acoustical point of view, Magneplanar MMGs are more similar to the sealed boxes using lowthers, or to the bass reflex boxes? In other words: do you recommend littel power current source amps for maggies?
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Paul
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