You do need to pair them with some amps above 0% efficiency but if you do you may be rewarded with glorious sound. It is important not to skimp on the second pair of "booster" amps.
When I first saw the ad, I was confused - I kept thinking De Longhi...De Longhi?? It's a good thing I shared this with my spouse (the one with the superior high frequency acuity) who said, "Don't get them. Besides, we'd need 4 of them to run the MegaLines!"
It should look like a radiator. 0% efficiency, that means all the power drawn from the wall is dissipated as heat and none transferred to the "load". What a bunch of.....
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