Atmasphere ma1,VTL mb250, Jolida JD 3000

Thanks Duke;check your email.

What a great response! Thanks for the detail.

Duke, I agree with Jafox. What a great response and a model for how folks in the business-of-audio can interact positively and constructively to share their knowledge. Thank you!

Rlef, one thought I would add is that the Atma-Sphere MA-1 will deliver exceptionally transparent, highly resolving sound, with accurate timbre and excellent bass authority, when the impedance match works. I can't speak to the VTL or Jolida equipment because I haven't hear them.
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The impedance of current Sound Lab models, namely the PX series, is being measured by Roger West at this time. I requested it since we are looking at a large installation which may involve driving more than one speaker from an amplifier, possibly Atma-Sphere. When the impedance curves are developed I will try to make them available.

Amplifier power output ratings are nominal only, especially when driving difficult loads. I have had 100 watt amps drive the U-1s here well, while 250 watt amps fell flat on their faces. Interestingly, both were tube amps with output transformers. The speaker load is a challenge for any amplifier, whether tube or solid state. Amps with robust power supplies tend to do better. Not all OTLs are necessarily well suited to drive big ESLs like Sound Labs, either.

Disclaimer: I'm a Sound Lab and Atma-Sphere dealer.

Brian

Brian, thank you. The impedance measurements would be very interesting to see if you can share them.
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