Second phantom still a good idea?

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I strongly urge everyone NOT to go near the maximum loudness of the Phantoms, even for a few seconds.
DO NOT PLAY YOUR PHANTOM's LOUD! PRESERVE YOUR HEARING. It is not worth losing it for a few moments of thrill.

By no means I recommended to listen to the Phantoms at their max levels. I only tried to answer to the question why two Phantoms might be less loud than a single one. As the only reference levels of Phantoms with respect to sound pressure levels are specified as max. levels I referred to those. For me in fact there is more quality in listening to music on the Phantoms at very moderate levels of 30-35 for music with lower dynamics or 40-45 for less compressed classical music. Listening at levels of 20-30 can be very relaxing and enjoyable, but requires very low ambient noise. Fortunately I live rural enough to find such silence.