NZtechfreak
Headphoneus Supremus
- Joined
- Jan 19, 2012
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It's not as clear cut as that...
The headphone Z being purely resistive means it won't vary with frequency, so it doesn't affect the frequency response. It also doesn't create a back emf so no issues with damping factor.
However, it is still wise to have a low amplifier output Z for low Z headphones because they are better matched to deliver the power efficiently.
Using a high Z amplifier (100+ Ohms) with a low Z headphone, generally, it won't be able to drive them adequately regardless if the are planars or not.
With very efficient headphones these days, some might but it won't be optimal, the amplifier will be running close to its maximum, not the best place to be for good sound quality.
The power issue, now that I can see may definitely be relevant. That depends on the amp and sensitivity of the headphones though, and what kind of power the amp puts out - probably part of the reason speaker amps hold so much appeal for planars, their often-high output resistance isn't troublesome and they have the reserves to still power the headphone.
If we're referring specifically to the HDVD800, well, I haven't heard that many good things about that amp with any headphone, much less planars.