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# HE-500, LCD2, D5000, DT770, SR80, on a speaker amp (Emotiva mini-X A-100) Project - Page 109

Quote:
Originally Posted by Armaegis

A speaker is given a power rating at a certain load. It's almost always given at 4 or 8 ohms. Let's call this load rating A.

Take your amp power rating and multiply by (A/B) to get your (approximate*) max power into the headphones.

For example, we have a speaker amp rated for 40W @ 8 ohms, and a headphone of 32 ohms nominal impedance. Our (A/B) ratio is 8/32 = 1/4 = 0.25

Thus our max power rating into the headphone is 40W * 0.25 = 10W

*note however that max ratings are limited by different things: voltage limit and current limit. If your max speaker load is given for both the 4 and 8 ohm load, the safer bet is to run the calculation off the 8 ohm load.

*or who gives a flippin rat's patootie, because you're not using more than the first 2W anyways. I use a little 24W desktop amp and it is more than enough.

Yeah, I think for most (sane) people you'll risk damaging your hearing before you risk damaging the drivers. That said, please turn the volume down before turning on the amp. If you're particularly paranoid about power-on transients, then unplug the headphone when you turn it on.

Perfectly explained.  It's a ratio * rated power.  Thanks guys.

### Gear mentioned in this thread:

I hear a flippin rat's patootie is quite the delicacy in the head-fi world.

Quote:
Originally Posted by nk77

I hear a flippin rat's patootie is quite the delicacy in the head-fi world.

Only in Summit Fi, cause they already tried everything else

Haha....keep in mind I wasn't trying to intentionally slight anyone...

http://www.sherbourn.com/products/pa2160

With the serbourn line closing and merging into emo, there's a pretty good set of deals. This amplifier looks pretty interesting. XLR inputs, symmetric design.

Just brought out my Sansui AU-317 and plugged the HE-500 straight into its headphone out. Does remarkably well against the DACmini which has a bit more treble energy, slightly less intimate in presentation and smoother overall. This is all using the DACmini as the source. But goshdarnit it's so close. I cannot believe I didn't try the Sansui earlier. But they can be had for cheap but of course may need some reconditioning love.

IIRC the Sansui was rated at 65W at 8ohms (don't quote me). My headphones were measured last at 36.33/36.53 ohms so roughly 14W max output.

Quote:
Originally Posted by nk77

Just brought out my Sansui AU-317 and plugged the HE-500 straight into its headphone out. Does remarkably well against the DACmini which has a bit more treble energy, slightly less intimate in presentation and smoother overall. This is all using the DACmini as the source. But goshdarnit it's so close. I cannot believe I didn't try the Sansui earlier. But they can be had for cheap but of course may need some reconditioning love.

IIRC the Sansui was rated at 65W at 8ohms (don't quote me). My headphones were measured last at 36.33/36.53 ohms so roughly 14W max output.

Not out of the headphone out? I guess there must be resistors in the path or something like that.

Ah of course. You are right David. There was plenty of headroom. The volume knob at around 10 o'clock was plenty loud for me. I will have to find out what resistors were used on that portion of the power amp.

Hmm found a couple of comments saying the headphone out can range from 100-300 ohm in headphone impedance. So much for the 1/8th rule....

thats the normal range pretty much for vintage headphone outputs

Did notice the Sansui was a bit warmer than the DACmini, and not as treble extended. Must be the high output impedance. Although if you are so inclined these older speaker amps have front EQ to try and tune the sound to your liking by boosting bass and treble (not sure what frequency/frequencies).

Hi guys! I just wanted to thank everyone here in this thread..because of this thread I bought an Emotiva mini-x! Actually I wanted to buy a HE-500, reading HE-500 threads lead me here lol..Now a mini-x is coming..I bought an emotiva xda-2 too for my olive one, NMT (media player), and laptop lol..and I bought a new pair of speakers! but still no HE-500 haha! hopefully in the near future I will be able to purchase one..got all my funds depleted already lol again thanks guys..I will post here again, once I have gotten a pair of HE-500.
Quote:
Originally Posted by d1sturb3d

Hi guys! I just wanted to thank everyone here in this thread..because of this thread I bought an Emotiva mini-x! Actually I wanted to buy a HE-500, reading HE-500 threads lead me here lol..Now a mini-x is coming..I bought an emotiva xda-2 too for my olive one, NMT (media player), and laptop lol..and I bought a new pair of speakers! but still no HE-500 haha! hopefully in the near future I will be able to purchase one..got all my funds depleted already lol again thanks guys..I will post here again, once I have gotten a pair of HE-500.

Congrats on the Emotiva!

Yeah get the HE-500 ASAP, because I'm in heaven right now...

Is there any european reseller that sells the Mini-x?

Quote:
Originally Posted by reiserFS

Is there any european reseller that sells the Mini-x?

I know one in the UK (got my demo unit from them in fact). But the asking price makes it significantly less of an budget choice compared to the US. Might as well stick with high quality t-amp =p

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