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# HE-500, LCD2, D5000, DT770, SR80, on a speaker amp (Emotiva mini-X A-100) Project - Page 161

Quote:
Originally Posted by manbear

Just wondering if anyone can check my physics here. I'm trying to calculate the power I'm getting into my HE-400.

Using the relationship P_2 = P_1 * (R_1 / R_2) (That's power and resistance), I have P_1 =  50 W and R_1 = 8 ohms for the Emotiva, and R_2 = 35 ohms for the HE-400, so P_2 = 50 * (8/35) = 11.4 W.

With 300 ohm serial resistors, I have R_2 = 300+35, so P_2 = 50 * (8 / 335) = 1.2 W. About the same as what a Magni would deliver with no resistors in the chain, yes? Interesting. I'm happy that I didn't get a Magni though. The Emotiva is way cooler.

Does it actually work this way? The Emotiva doesn't have 100 W into 4 ohms, so it seems like this linear model isn't quite right?

You are right about the power part without resistors. The linear model isn't quite right, but I guess that is quite logical ( 0,1 ohm 4kW lolz). Don't think too much about that, though. You need to measure the power output at different impedances to be sure about anything. But 11.4 W is a good approximation anyway, though the number might be a little higher as the amp most likely delivers even higher voltage at higher impedances as the load is easier to drive and requires less power yielding less distortion...

Something tells me you aren't right about the serial resistor thing as what you calculate is the overall power that the resistor + headphone is eating. You only want the headphone power consumption, I guess. In series, the amperrage is the same across both the headphone and resistor. That'll be I=sqrt(P/R), which is around 0.06 A. The voltage of the system is then: U = P/I which is around 20 V, a little more perhaps.

Anywayz, the voltage drop between headphone and ground will be: (35/335)*20V which equals around 2 volts. 0.06 A * 2 V equals a puny 120 mW, though the number is bound to be quite higher. Can explain that as well if you want... Has to do with input sensitivity and depends on your source as well. But no one can know these numbers for sure without measuring.

Correct me if I am wrong, I have no education in electrical engineering or anything like that, except what we've learned in physics, though

### Gear mentioned in this thread:

Quote:
Originally Posted by manbear

I've been digging around in my desk for some old Apple earbuds I thought I had, specifically so I can try to fry them. It would please me

Videooo!

I'm moving soon and I might have a problem accommodating the 'mini' on my new workspace (plus the fiance disapproves of the ugly big black block with blue lights...sigh). So I was wondering if there was anything  more compact, good looking, that is just as good as my 11.32->mini combo. Say below 2k. It would be great if it was bonkers cheap though.

Quote:
Originally Posted by mohdkhamsya

I'm moving soon and I might have a problem accommodating the 'mini' on my new workspace (plus the fiance disapproves of the ugly big black block with blue lights...sigh). So I was wondering if there was anything  more compact, good looking, that is just as good as my 11.32->mini combo. Say below 2k. It would be great if it was bonkers cheap though.

Are you looking for a speaker amp?

Oh sorry I forgot to add. Doesn't have to be a speaker amp, although if it was, I'd prefer one with shared ground. Can also be a dac+amp combo. As long as it can drive the he-500 well. Pretty upset that I might have to let this gem of an amp go though. I thought I'd post this here because some of the mini owners have multiple setups and I'd appreciate it if they could chime in.

Quote:
Originally Posted by mohdkhamsya

I'm moving soon and I might have a problem accommodating the 'mini' on my new workspace (plus the fiance disapproves of the ugly big black block with blue lights...sigh). So I was wondering if there was anything  more compact, good looking, that is just as good as my 11.32->mini combo. Say below 2k. It would be great if it was bonkers cheap though.

I just put my Mini on a roll-out cart underneath my desk. That works for me.

Quote:
Originally Posted by koiloco

IMO, For HE500 : Price, Performance, potential to drive speakers, IMO the Emotiva would come out ahead in most, if not all, categories when compared to even higher audio grade models that would cost you \$\$\$ more.  To me, the tipping \$ price point start around \$800.  The only trouble is that you have to make an adapter to connect your headphones.  I liked the Emotiva so much I put a 1/4" TRS in the front panel permanently.  My opinion about the Emotiva has not changed one bit even after I purchased a Woo WA22.  Yes, I prefer my HE500 driven by the Emotiva over my WA22.

People's take and preferences might vary.

in the front panel. Did you mod it and cut a hole?

If so I want a "KOILOCO MODDED A 100"

Edited by grizzlybeast - 11/21/13 at 8:14pm
Quote:
Originally Posted by grizzlybeast

in the front panel. Did you mod it and cut a hole?

If so I want a "KOILOCO MODDED A 100"

End game.....For now :)

Edited by koiloco - 11/21/13 at 8:22pm
Quote:
Originally Posted by koiloco

End game.....For now :)

I have never been more jealous. I don't have the time or the patience but boy do I want that!!!!. I would pay for it over a t50 modd if it was reasonable ofcourse.

Edited by grizzlybeast - 11/21/13 at 8:56pm

You should get in the business of selling modded MiniX and banana plug to 1/4" cables on the side, koiloco. Have people send in their MiniX and mod it for \$80-\$100, or just sell the modded MiniX for \$250-\$300, depending on MiniX prices. You could probably simply sell the banana plug to 1/4" cable for \$30-\$40. You'd be surprised on how many people are scared of modding/soldering. Of course I claim 10% royalties for throwing out this idea. Keep that in mind when you set prices and profit margin.

Quote:
Originally Posted by Sonido

You should get in the business of selling modded MiniX and banana plug to 1/4" cables on the side, koiloco. Have people send in their MiniX and mod it for \$80-\$100, or just sell the modded MiniX for \$250-\$300, depending on MiniX prices. You could probably simply sell the banana plug to 1/4" cable for \$30-\$40. You'd be surprised on how many people are scared of modding/soldering. Of course I claim 10% royalties for throwing out this idea. Keep that in mind when you set prices and profit margin.

+1,000

Quote:
Originally Posted by Sonido

You should get in the business of selling modded MiniX and banana plug to 1/4" cables on the side, koiloco. Have people send in their MiniX and mod it for \$80-\$100, or just sell the modded MiniX for \$250-\$300, depending on MiniX prices. You could probably simply sell the banana plug to 1/4" cable for \$30-\$40. You'd be surprised on how many people are scared of modding/soldering. Of course I claim 10% royalties for throwing out this idea. Keep that in mind when you set prices and profit margin.

lmao.  I will have to get Jing to help me out.  His soldering skill has vastly improved since we put together his crack.

Between work, family and my other hobbies, i don't have much time and energy left but it is indeed a great idea.  Modulor suggested the same thing to me a while back so it will have to be 5% for him and 5% for you.

Quote:
Originally Posted by mohdkhamsya

Oh sorry I forgot to add. Doesn't have to be a speaker amp, although if it was, I'd prefer one with shared ground. Can also be a dac+amp combo. As long as it can drive the he-500 well. Pretty upset that I might have to let this gem of an amp go though. I thought I'd post this here because some of the mini owners have multiple setups and I'd appreciate it if they could chime in.
The Topping TP60 is quite a bit smaller than the Emotiva and has about the same power. It's sounds great to me using the15.32 as the DAC. Not sure how the sound compares to the Emotiva because I haven't heard it.
Quote:
Originally Posted by koiloco

lmao.  I will have to get Jing to help me out.  His soldering skill has vastly improved since we put together his crack.

Between work, family and my other hobbies, i don't have much time and energy left but it is indeed a great idea.  Modulor suggested the same thing to me a while back so it will have to be 5% for him and 5% for you.

Man don't remind me about the Crack. Jing told me about the special Crack deal that weekend with free Speedball, and we both ordered the same day. When it finally came, he convinced me to build it first and let him know of any pitfalls. Well one major one is borrowing a friend's weak soldering iron and using high melting point lead-free solder. Ended up taking 10 minutes per solder joint cuz I could not simply heat up the metal and have the solder melt when touching the metal. I had to sandwich the solder between the iron and the metal, and then wait for it to melt. In all, I think it took me 15 hours to complete it. So scarred I still haven't put in the Speedball yet. Got hooked onto HE-500, so kinda put the Crack aside. It's looking like the Quickie has shipped and will be coming in after Thanksgiving. This time I'll buy a quality soldering iron for myself. Hopefully this time it won't be so painful, and I'll carry the momentum and add in the Speedball as well.

Quote:
Originally Posted by Sonido

Man don't remind me about the Crack. Jing told me about the special Crack deal that weekend with free Speedball, and we both ordered the same day. When it finally came, he convinced me to build it first and let him know of any pitfalls. Well one major one is borrowing a friend's weak soldering iron and using high melting point lead-free solder. Ended up taking 10 minutes per solder joint cuz I could not simply heat up the metal and have the solder melt when touching the metal. I had to sandwich the solder between the iron and the metal, and then wait for it to melt. In all, I think it took me 15 hours to complete it. So scarred I still haven't put in the Speedball yet. Got hooked onto HE-500, so kinda put the Crack aside. It's looking like the Quickie has shipped and will be coming in after Thanksgiving. This time I'll buy a quality soldering iron for myself. Hopefully this time it won't be so painful, and I'll carry the momentum and add in the Speedball as well.

You don't have to tell me about soldering iron.  I called and asked Jing "do I need to bring mine over?"  "Nope, i have one"...In short, we suffered just like you but also managed to get it done after some swearing.  The tip he had was all messed up and no longer very conductive.  It was fun though.

As for soldering iron, look no further than this :

http://www.amazon.com/dp/B00BSW69LI/ref=pe_385040_30332190_pe_175190_21431760_M3T1_ST1_dp_1

That's what I have and very satisfied.

Edited by koiloco - 11/21/13 at 9:32pm
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