- 235 Posts. Joined 2/2006
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Well said Neuromancer ...obviously the 105 has been a beta product for a while and design changes are expected as part of its maturing process. It also seems that the headphone amplifier was a late addition to the feature set, of which i am very glad. Had a screaming female neighbor recently yelling at me on a friday night(9pm) to turn down my music in my small 750sq.ft 1-bedroom apartment room. I guess having dual 1000W subs as part of a 5.2 audio system doesn't help either(I was having fun anyways).
Headphones will help me get along with my neighbors a little better. Since headphones are a new world to me, this is yet another purchase i'll have to deal with soon. I hear magneplanar and electrostatic types sound the best overall?
Do they sound better overall? It's a matter of taste.
I've been using the Sennheiser HD 650. I'm quite pleased with the sound.
I hear electrostats have the best midrange/treble but are weak in bass. The other types might have have the midrange/treble magic of the electrostats but have much stronger bass.
Probably true IF the efficiency is too low which is typical of some or most electrostatic headphones. The Hifiman HE-6 is rated at about 83dB/mW efficiency which is low hence requires an amp.
Wow, highly efficient at 91dB/mW and many superb top notch reviews. How do you like their deep bass response? Is it abundant or merely satisfactory? The $1K price gives me some pause though, but as they are planar magnetics with superb frequency response, the price should be warranted. Something new to drool after...
The LCD2 is rated at 60ohms of which Oppo outputs a stated 91mW continous into that impedance. With an stated LCD2 efficiency of 91dB/mW, it means the maximum the Oppo would produce into the LCD2 is [91mW + 10* log(91mW/1mW)] = 110.6dB which is plenty loud enough. and this isn't peak power but continuos power. The number is higher depending onthe headroom Oppo allows is TPA6120 headphone amplifier to have. This agrees well with Oppo's assertion to me that they've tested many headphone types and have yet to find those that cannot be driven to satisfactory levels.
Have you tried to listen to 110dB spl with normal speakers? If not, you will not do so for long to protect your hearing, let alone incur the wrath of your family and/or neighbors. This is simply way too loud and infact dangerous to your hearing mechanism for any prolonged amount of time.
I found this snippet on the net...
Experts agree that continued exposure to noise above 85 dBA will cause hearing loss. To know if a sound is loud enough to damage your ears, it is important to know both the loudness level (dBA) and the length of exposure to the sound. In general, the louder the noise, the less time required before hearing loss will occur. According to the National Institute for Occupational Safety and Health (1998), the maximum exposure time at 85 dBA is 8 hours. At 100 dBA, the maximum exposure time is one minute and 29 seconds.
The following are decibel levels of common noise sources around us. These are typical levels – actual noise levels may vary depending on the particular item. Remember, noise levels above 85 dBA will harm hearing over time, anything above 140 dBA can cause damage to hearing after just one exposure.
For the HE-500, maximum continuous power from the Oppo would be 89dB + 10*log(137mW/1mW) = 110.4dB! actually more since the 137mW power rating from the Oppo is spec'd into 32 ohms and it doesn't include the dynamic headroom of the headphone amplifier. The 89db is the manufacturer's listed spec for sensitivity at 1mW into 38 ohms impedance.
The Beyerdynamic T90 is very efficient at 102dB for 1mW input into its 250 ohm impedance. So the maximum continuous spl from the Oppo would be approx 102 + 10*log(23m!/1mW) = 115.6dB or more! The 23mW power spec i've listed in the equation is for a 300 ohm load(as Oppo doesn't power spec a 250ohm load).
Either headphones should be plenty loud and dynamic enough as the Oppo can produce greater than 110dB continuous power outputs from them, assuming they can handle these spls w/o breaking up or distorting. If you account for the amplifier's dynamic headroom, the peak levels would even be greater.
As Neuromancer has indicated, his Audeze LCD2 are driven to satisfactory levels by the 105...