Sennheiserin oma vastaus:Tuo Sennheiserin vahvistin onkin kieltämättä erikoinen tapaus. Se pistää miettimään, onko sen suunnittelussa ollut tietoinen tarkoitus tuottaa laite, joka paikkaa HD800-sarjan paljon puhuttuja puutteita. Kysymys olisi siis ns. hallitusta p*skomisesta.
Sennheiser Q&A: HDV 820 Digital Amplifier
Firstly, we would like to thank everyone for their interest and questions about our product and work! We started these Q&A's to interact more with the community, and it's heartening to see all the response. We also want to respect you with accuracy in our response back to all of you. We’ve...
www.head-fi.org
Eli vahvistimen impedanssi on täysin harkittu valinta. Täten, jos haluaa kuulokkeista sen potentiaalin, jota valmistaja on tavoitellut, niin se ei välttämättä löydy niistä absoluuttisesti "parhaista" mittaustuloksista."I know it's designed with full-sized headphones in mind, but how does it perform with IEM's (Sennheiser IE 800 in particular)?... I've read as a general rule of thumb that you want the output impedance of your amp to be at least 1/8th that of your headphone's impedance. Even some full size headphones like the Fostex TH900 (25 Ω) and Focal Utopia (80 Ω) could be negatively affected."
[Grell, Axel] There is no general rule for “the right output impedance” for a headphone amplifier. There are some high output impedance tube amplifiers that sound great, others don’t, some Zero- Ohms solid state amplifiers sound cold and harsh, others sound good. A headphone and a headphone amplifier is a complex system of impedances, amplifier feedback loops, amplifier current supply and so on. That could lead to typical distortions and dynamic changes of the amplifiers output parameters depending on the headphone impedance and the type of amplifier. Therefore we made listening tests with many different headphones (Sennheiser and other brands from 25 Ohms up to 600 Ohms) using different impedances at the output of the prototypes of HDV 820. The outcome of this listening tests are the output impedances of the HDV 820.
As you can see from the attached curves a HDV 820 can drive a TH900 with 2.75 W. This should be enough.
Once upon a time, the "standard output impedance" was 120 Ω. Generally speaking, don't lose sight of the forest because of focusing too much on one tree.
Lopetan nyt kuvaketjun sotkemisen