Recommend an amp for electrostatic speakers 1.2 Ohms - diyAudio
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Old 24th April 2014, 01:22 AM   #1
beanbag is offline beanbag  United States
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Default Recommend an amp for electrostatic speakers 1.2 Ohms

Hello folks,

Does anybody have an amp (module) recommendation for driving the panel section of a hybrid electrostatic speaker? It has the high-pass circuitry already built in, so that means the amp does not drive the transformer directly. There is a (small) series resistor and DC blocking capacitor in the way. The impedance is higher at lower frequencies and only drops to 1.2 Ohms at 20 kHz. Preferably I would like a unit that can do 100W or more into 4 ohms.
Thanks
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Old 24th April 2014, 10:59 AM   #2
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Not a cheap solution:
hoellstern 12.4 can go down to 1 Ohm per channel
http://www.hoellstern.com/1_DE/050_d...0-04-22_dt.pdf
they use PFC PSU and can therefore deal with wide input range.
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Old 24th April 2014, 11:05 AM   #3
Rewind is offline Rewind  Sweden
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I wonder if it matters much at such high frequencies.
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Old 24th April 2014, 01:30 PM   #4
PMental is offline PMental  Sweden
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Hypex amps handle 1 ohm impedances without trouble. The NCore is the top one, but the cheaper UcD modules can also handle 1 ohm loads.

Hypex Electronics BV - Home

NCore400 data sheet: http://www.hypex.nl/docs/NC400_datasheet.pdf
UcD400 data sheet: http://www.hypex.nl/docs/UcD400HG_datasheet.pdf

(See "Recommended operating conditions" for minimum load impedance)

Both of these should have you covered comfortably in the power department and should sound great as well. Some DIY required though, mostly just connecting stuff together (PSUs, cables and such are also available from them).
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Old 26th April 2014, 10:36 PM   #5
beanbag is offline beanbag  United States
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Thanks. The Hypex seems to way to go. I could not get any info on whether any of the other class D boards, such as from hifimediy, connexelectronic, or classdaudio would do 1 ohm. Some could do 2 ohm.
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