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You may want to PM Alex (FFRESPONSE on head-fi) about a loaner unit or something 

Is the sensitivity / efficiency of the PMx2 different from the PM-2?
Must say that I'd love to give these a listen; sounds right up my alley. Would be great if a loaner tour could be arranged (similar to the Oppo tours).
Is there a possibility for upgrading/modding for existing PM-2 owners?
Any plans for the PMx3 mod?![]()
Is there a possibility for upgrading/modding for existing PM-2 owners?
I think its possible, but you have to ask Alex, there are some PM-2s that won't cut it.
I think its possible, but you have to ask Alex, there are some PM-2s that won't cut it.
What exactly do you mean?
Alex and I discussed this when I met him in San Diego, but the measurements he does points to the fact that some PM-2s are not like other PM-2s, therefore some "matching pairs" of drivers are not the same. Some of the ones Alex has tried to modify he ended up throwing out due to imbalance on the left and right sides.
Planar magnetic drivers in general display quite a bit of inconsistency in FR. To see where manufacturers of planar magnetic drivers currently are with respect to this matter I can recommend checking measurements of different units of the same model on Innerfidelity.
In some cases it takes us days of hard work and dozens of measurements while employing different modifications all in order to bring certain units to our target FR. We actually didn't throw drivers away because they weren't up to our standards (they simply are too expensivewe broke them while trying to improve FR. The good news is in the last two months we were able to modify every single one and are hoping it will continue to be that way.
I agree! I've had some friends listen to the PMx2 and Ether side-to-side and though we all agree that the Ether sounds amazing and feels amazing (especially soundstage-wise), the PMx2 has been taking our ears by storm. One of my treblehead friends actually said "I think I like this better than my treble" out loud to us while listening to some Dream Theater... so great job to Alex as well! I've already introduced his brand to several of my dealers here in the Philippines and they've been picked up already by a local audiophile store, Egghead.
mmm.....and Egghead here in Manila, Philippines just delivered to the local headphile community. Two units of the PMx2 just arrived today and I am the first customer. Initiatial impression: I have the Oppo PM1 that I bought last year from Jaben HK. As impressed as I am with the PM1, this Zenith Audio version of the PM2 is just loads better, no question about it. I am playing some of my favorite classical music (Italian arias, symphony etc.) and I am highly impressed by what I am hearing. It sounds really, really great. Whatever magic Zenith Audio did (with the pads/drivers/etc.), it seems to have worked out well. Kudos to Zenith. You're on to something really great.