2-MH, watts

Read more on the Acoustat 2-MH in our home audio section

Jim2005-11-09 16:07

what is the required watts to efficiently drive the 2-MH?


Andy Szabo2005-12-10 10:21

An electrostatic loudspeaker is not an easy load for an amplifier. It is an inefficient speaker, requiring more voltage from the amplifier. Its impedance is fairly low, requiring the amplifier to deliver more current. Thus, choosing an amplifier requires some care, although the majority of amplifiers with sufficient power will do a good job. For most music applications, 100 wpc (8-ohm rating) is sufficient. This will depend on your musical tastes, the size of your room, and how loud you want to play. With care, amplifiers as large as 250 wpc may be used. Avoid amplifiers with ‘bridged’ output configurations. In most cases, you’ll do better with a separate amplifier, rather than a receiver or integrated amp. That said, there are those Acoustat owners who favor small vacuum tube amplifiers, and are satisfied with 50 wpc channel. These folks are in the minority, though, and they clearly aren’t crankin’ rock n’ roll.

David2012-03-05 10:10

Current configuration is tri-amped using 2 DBX 223XL electronic crossovers - 1 per channel. (Speakers were rewired for Bi-Amp in 2005):

2 Earthquake Super Nova 15 Mark IV, spaced 95 Cm between centres to allow for tunnel effect & cancelation, crossover 60 Hertz;

Original 2MH bass units (in action, as detail above by David since 2005, when repaired), powered by a Rotel power amp RB-1080 (200 Watts per channel), cross over at 60 & 250 Hertz &

Main 2MH panels are powered by 2 Yamaha P4500 - Bridged, with possible power around 2700 Watts per channel for the expected load (around 2 Ohms at higher frequencies), crossed over at 250 Hertz.

The main high voltage interface boards, inside the sub box, have caught fire a few times, leaving holes in the fibre glass boards. This has been eliminated by removal of residual carbon and mainly sealing both sides of the circuit board with high voltage Silastic - eliminating arc over.

Never heard electrostatics work this hard since insulating both sides of the interface boards. Obviously the input transformers can be heard to audibly saturate if given sustained big levels, but for big dynamics, prior to saturation - O bliss.

As you may realise, I have enjoyed getting to this point and sharing. If you have a set of 2MH, they are more capable than you may realise, in my opinion.


Andy Szabo - Acoustatanswerman2012-03-05 18:45

I am glad to hear you are happy with your current set-up. Of course, you have WAY more power than required or recommended, hence your interface 'fires'. Proceed with caution. You are in danger of frying the transformers, which are not repairable like your printed circuit boards.

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