Millet hybrid ?
post #91 of 1676
9/24/09 at 10:02pm
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Indeed!
From personal experience, the following amps work especially well with the 600 ohm Beyers, in no particular order: Audio-GD Phoenix; Darkvoice 337; Decware CSP-2; RSA Apache and Stealth; Ming-Da MC84C-07; Blue Circle Audio SBH. |


But a lot of the cool amps in a good price range seem to be DIY, so not wanting to deal with that reduces the options. So thanks for those suggestions, there is a lot to look into and narrowing it down at all really helps.
They don't sound too bad with this actually, although obviously they need more juice to reach any kind of actual potential. 600 ohms would probably just crap out though, which is why I want to have an amp here and ready to go before ordering them.
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my portable!
They don't sound too bad with this actually, although obviously they need more juice to reach any kind of actual potential. 600 ohms would probably just crap out though, which is why I want to have an amp here and ready to go before ordering them. |
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I for one am curious to find a SS that can power these beasts that won't break the bank.
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+1
I want to go SS, then compare with my LDMKIII. I don't want to get into tube-rolling and spend a ton of money to try and figure out if I like the sound differences. |

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Do you know the output impedance of your portable?
In my experience, the DT880/250 sounds best when driven by an output impedance in the range 100-120 ohm. It brings up the bass and evens out the tonal balance nicely. If your amp has a low output impedance, you can experiment and add series resistors inline with the cable to increase the source impedance. |
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Originally Posted by saint.panda
Serial Resistance Adapters (e.g. 120 Ohm or 75 Ohm)
Certain headphones like the Beyerdynamic DT 831 or DT 660 benefit from the use of a serial 120 Ohm adapter39 that is put in-between the headphone plug and the headphone jack. While this reduces overall efficiency, which means the headphone becomes harder to drive, it can also “correct” unwanted deviations in the frequency response and make the sound more pleasant. Usually, you can foretell the effects of an added serial resistance by looking at a headphone’s impedance curve. For sound quality, I recommend using the 120 Ohm with the Beyerdynamic DT 660, DT 831 and Ultrasone HFI 650 mainly to tame the brightness and add some more presence to the lower midrange. The Ultrasone, however, is an otherwise efficient portable headphone that will most likely require an amp after adding the 120 Ohm resistance. One reason the Beyerdynamic headphones might benefit from a 120 Ohm adapter is because there used to be different standards for the output impedance of headphone amps. Nowadays, close to 0 Ohm is the standard but some receiver jacks still have an output impedance of 120 Ohms. Headphones like the DT 831 might have been designed with an amp’s output impedance of 120 Ohms in mind. The Etymotic ER-4P benefits from a 75Ohm adapter or adapter cable and the ER-4S is in fact just an ER-4P with an internally added serial resistance of around 75 Ohm. The technical background behind adding serial resistance to a headphone has to do with damping factor. |

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They are not designed for 120Ohm output impedance.
You may like how they sound with shifted FQ but this is not their intended by engineers sound. More info: |


