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= HiFiMAN HE-560 Impressions & Discussion Thread = - Page 545

post #8161 of 8163

Haven't been listening to headphones much lately, but the last time I did a few days back man do I love the 560s with the A18 (seeing as how were talking amp synergy). Still planning on having my speaker taps made, but lately I've been dumping plenty of cash into another passion of mine (a revitalized one) collecting mineral specimens. Damn I wish I hadn't done that first e-bay search! I have enough money tied into my minerals (very small collection at present) to buy the TH900 I have been wanting to try for a few years now. That will have top wait like my speaker tap until this new run on mineral purchases ends!

post #8162 of 8163
Quote:
Originally Posted by Bill-P View Post

Well, if you've been paying attention while you purchase your gears... I'd say that pretty much any number on a specs sheet would be useless overall. Just plug the amp in and have a listen, right?

That was my goal to begin with... to make an amplifier that sounds good to me regardless of technicality.

I only threw out a number because someone was curious.

hahah I am curious!!! I didn't mean that statement in a negative way. I just want to hear the other specs as well & how they relate to performance as my knowledge with amps is quite limited. sounds like "moar power is betta = highest max output" to me =P heh but also sounds like you are saying that "moar stable power is even moar important = which would be RMS power ratings right??" ...or is my understanding of the physics completely off? hahah. been years since my last physics class.

 

Quote:
Originally Posted by garunamodi View Post
 

Music is odd, because it has peaks (duh) that are very short. A pure sine wave requires about 3x more energy than music with the same peak (iirc, don't quote me on that). But ideally an amp should never be pushed to it's absolute limits, because that's where distortion will be worse.

 

So, ideally, you'd want to know max voltage and current your amp can output into your hp's resistance continuously to make a decision. Vrms is definitely extremely useful, but for planars max current is also useful due to their low resistance. That said, current still isn't as important.

 

There are a few DIY amps around, which you can build if you're good with a soldering iron - the real trick is in designing a good amp, not building it.

 

hahaha... I honestly just went with the tube amp with the highest RMS W/channel & was generally well-reviewed in my price range, but would love to understand more about what specs are important & what specs translate to in terms of real-world sonic performance & which specs to think about when looking for he-560 pairings. kinda weird though, different amp include different specs & difficult to directly compare, doesn't seem like any one amp usually lists a totally complete spec sheet.

post #8163 of 8163
Quote:
Originally Posted by money4me247 View Post

 

hahaha... I honestly just went with the tube amp with the highest RMS W/channel & was generally well-reviewed in my price range, but would love to understand more about what specs are important & what specs translate to in terms of real-world sonic performance & which specs to think about when looking for he-560 pairings. kinda weird though, different amp include different specs & difficult to directly compare, doesn't seem like any one amp usually lists a totally complete spec sheet.

I spent some time learning on head-fi and other sources (people who gave nice explanations about the way amps and output power work with headphones). Simply put you need to look at the headphone's sensitivity rating: like for he-560 its 90dB/1mW. So putting 1mw of power through them, meaning max volume on an amp that outputs 1mw, will get you 90dB of sound pressure. But the power needing to go above that is exponentially greater. there are charts floating around that easily tell you what power is needed for what sensitivity/impedance, but I cant remember where to find them. As a reference point, I was able to learn it takes about 500mW or so to properly power a pre-fazor lcd 2. If the amp could output 500mw at 50-60 ohms, it could properly power an lcd 2. but you would need to have the volume up very high. So for amps like my V281 which in single ended mode output 2.7 watts into 50ohms or even 4.2 watts in balanced, what you get is proper headroom, and an ease to the sound. the magnets get access to more power when they need it, so even at low volumes the sound is full spectrum. Also if you look at any innerfidelity pdf graphs for headphones, at the very bottom right there is always a listing that says how much actual power is needed to get 90dB spl. Even for the he-6 it only takes 20mw to reach 90dB (obviously you need way more for the reasons posted above) but technically the amp is only putting out that little amount at most instances aside from peaks. the he-560 takes like 2.5mw, and the lcd 2/he-500 take like 0.75 or so.

 

Short Version:

 

Think of your amp as always running in idle and it mainly just moving forward idling in gear, but sometimes it needs to go over a peak and the more power it has the easier time it will have getting over the peak (different headphones create different sized peaks). and planars are like going up a slight incline all the time, the less efficient they are the steeper the incline, but they dont really have peaks as much (like the hd800 peak at 100hz or so that goes up to 650ohms from 300).

 

Nothing I just said is set in stone, but as an idea of whats going on and what specs are important to look at, this should help a bit. :)

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