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Old 16th April 2007, 12:02 AM   #1
cotdt is offline cotdt  United States
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Default Directly driving ribbon tweeters

Transformers cause a lot of distortions, so I would prefer using an amp that can directly drive the low impedance of a ribbon tweeter, without using an output transformer. Who makes such amplifiers?
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Old 16th April 2007, 03:39 AM   #2
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cotdt.

A ribbon tweeter will have a DC resistance around 0.05 ohms. You can put a non-inductive resistor of about 0.2 ohms in series, accept the power dissipation loss, and use a solid state amp like a KRELL KMA100 which can drive very low impedance loads. Naturally you can use a 2 ohm non-inductive series resistor and a normal amp and accept a larger power loss.

Read over the KSA 100 MKII clone thread and consider running some Spice using a +/- 5V supply on the output with a 0.1 to 0.25 ohm load.

You can also go to the digital section and read over the TI xx261 digital amp thead and ponder a very low output power supply voltage, a super low impedance MOSFET(or two) and a super thick wire output inductor(or two).
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Old 16th April 2007, 06:07 AM   #3
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also you can project an high current - low voltage amplifier only for
tweeters with mosfet very low rds_on.
(With active filter two or tree way amplification)
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