Originally Posted by r010159
Anyone have experience with these products? I am thinking the USB powered Dragonfly will not have enough power to adequately power my 300 ohm DT880Premiums. I do not know about the other two.
I will properly introduce myself. I am 55 years old and have had an interest in audiophile grade reproduction of music since I was 12 years old. First time I heard music though my father's Altec Lansing 'Voice of the Theater" type speakers blew my mind at a young age. I like my music! I appreciate we'll recorded and mastered music. I like accuracy with a slight emphasis on the higher frequencies, but nothing sibilant and tiring. I like detail in my bass. I like the DT880Premiums, but not the ATH-AD900X. And I like getting all of this with not inexpensive but still value oriented products.
Any help would be appreciated.
300 ohm Beyers will want to see plenty of voltage swing. Unfortunately (or fortunately, depending on which camp replies) that means tubes. Their high voltage means that they inherently have a higher voltage swing than solid-state. Heck, most tubes operate at voltages high enough to burn out most solid-state parts.
I remember the Voice-of-the-Theater Altec-Lansings. My friend and I almost purchased a pair that were marketed like that. He ended up purchasing a pair of Boston-Acoustics bookshelf speakers. I went with Advents.
Seriously, you need an amp. Very few - if any - combo DAC/amps are going to power headphones properly at 300 ohms. You are absolutely correct that a Dragonfly is not going to do it. Anything USB-powered, unless it has a huge buck-boost circuit*, is not going to power a high-impedance headphone properly. USB is limited to 5V. That means at most - + or - 2.5V. At 300 ohms, that's going to give you a whopping 21mW of power - and that's "music power," not RMS.
* Buck-boost circuits have their own particular problems - lots of extra noise inherent in the circuit.