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Speaker amps for headphones - Page 50

post #736 of 2631

So if we hear about major explosions in the Dallas area we'll have some idea about how the testing went...  We honor you for your bravery Mr. Zilch!

post #737 of 2631
Yee-haw! :-)
post #738 of 2631
Quote:
Originally Posted by zilch0md View Post

Yee-haw! :-)

You are quite the battery guru  zilch0md! My hat goes off to you. As a side note, where did you get the case for your travel rig? The one with the LCDs inside it.

post #739 of 2631

Thanks brunk!

 

 

Travel Rig as stored when carrying

 

 

That's the Italian-made HPRC 2400F (High Performance Resin Cases), shown here with a Touch, for scale.

 

 

 

It's available in black, blue, red or yellow and in different sizes.  It's waterproof (literally), bullet proof (figuratively speaking) and even has an automatic pressure equalization valve. It can be ordered with die-cut pluck foam. Just plan where you intend to put your junk before you start plucking. 

 

http://www.amazon.com/HPRC-2400F-Hard-Cubed-Black/dp/B004B8VLUU

 

http://www.plaber.com/cases.htm

 

Mike


Edited by zilch0md - 8/20/13 at 9:05am
post #740 of 2631

Cool, thanks! Lifetime replacement warranty too, very nice.

Quote:
Originally Posted by zilch0md View Post

Thanks brunk!

 

 

Warning: Spoiler! (Click to show)

Travel Rig as stored when carrying

 

 

 

That's the Italian-made HPRC 2400F (High Performance Resin Cases), shown here with a Touch, for scale.

 

 

Warning: Spoiler! (Click to show)

 

 

It's available in black, blue, red or yellow and in different sizes.  It's waterproof (literally), bullet proof (figuratively speaking) and even has an automatic pressure equalization valve. It can be ordered with die-cut pluck foam. Just plan where you intend to put your junk before you start plucking. 

 

http://www.amazon.com/HPRC-2400F-Hard-Cubed-Black/dp/B004B8VLUU

 

http://www.plaber.com/cases.htm

 

Mike


Edited by brunk - 8/20/13 at 9:24am
post #741 of 2631
Look what came. Can't wait to try them out
post #742 of 2631

Sweet!  Did you get all of that from BTG?

 

Enjoy!

 

Mike

post #743 of 2631
Quote:
Originally Posted by zilch0md View Post

Sweet!  Did you get all of that from BTG?

Enjoy!

Mike

Yup all from. BTG. Looks like good solid work from Brian
post #744 of 2631
And he has very reasonable prices. I've yet to do business with him, but that's where I'm going or my next cable need.

Mike
post #745 of 2631
More info regarding the (potential) use of six 4.2V Li-Ion AA batteries + two AA dummy batteries in the MG3 battery compartment as discussed earlier...

Jan Plummer brought to light the possibility that this scheme might fail to supply the current an MG3 could demand when operating at 25.2V (4.2V x 6 cells) vs. the current demanded when operating at 12V (with 1.5V per cell x 8 cells). The higher the voltage supplied, the more current the MG3 will demand. Yes, it's too much current that can blow the 4A fuse, but it's too much voltage that can create that excessive current demand.

Digging for answers on whether or not the AA Li-Ion batteries can satisfy the MG3's current demands, I found this page where the Tenergy 14500 AA Li-Ion has a spec for a Max. Discharging current of 2.5C mA (for continuous discharge).

As explained in my first post regarding LiPo batteries, the "C" refers to the maximum number of Amps that can be pulled continuously without overheating the battery.

The specification "2.5C," above, invites us to multiply this battery's capacity of 800mA by 2.5 to calculate a maximum permissible load of 2000 mA (or 2.0 Amps), which is a little shy for the MG3, given our knowledge that it can pull 4.0 Amps (blowing its fuse) with the maximum permissible supply voltage of 27.5V (or is it 30V?). ;-)

Either way, despite the fact that the battery compartment isn't fused, I'm hoping it's unlikely the MG3 is going to draw more than 2.0 Amps continuous at 25.2V. It might not even burst to 2.0 Amps - so, I think these 4.2V AA Li-Ion batteries can deliver the 25.2 Volts (with six cells) AND plenty of current, too.

:-)

But here's another concern... I've mentioned previously that Lithium batteries can be damaged, by discharging below 3.0 volts. This is serious business. You can start fires by over-discharging Lithium batteries - and the resulting soot and smoke is toxic. That's why I use a low-voltage alarm when discharging LiPo batteries in normal use. Indeed, that's why so many types of voltage monitoring aids are made for RC hobbyists.

Which begs the question: How will we monitor the voltage of these AA Li-Ion batteries while enjoying the MG3? I'm not interested in stopping every 15 minutes to pull the batteries out of the compartment and measure their voltages!

Here's the answer (add money and stir): Use six of THESE batteries instead:



Built into each battery: "Protected against short circuit, over discharge, over-current discharge."

When the MG3 suddenly stops playing, it will be time to recharge the batteries. Simple!

Those other batteries are "unprotected" - it says so in the specs.

Mike
Edited by zilch0md - 8/26/13 at 9:58pm
post #746 of 2631

Actually, those protected batteries look like something I might want to do.  Total deal with a couple of chargers (needed to charge 6 at a time) is still ~$75, which is pretty reasonable.  Two sets plus chargers plus a set of dummy batts is still ~$125 (+ shipping) and pretty reasonable if they last more than a couple hours. 

 

So hurry up and test them Mike!  Just keep a fire extinguisher close by...


Edited by Gary in MD - 8/20/13 at 9:17pm
post #747 of 2631
Quote:
Originally Posted by Gary in MD View Post

Actually, those protected batteries look like something I might want to do.  Total deal with a couple of chargers (needed to charge 6 at a time) is still ~$75, which is pretty reasonable.  Two sets plus chargers plus a set of dummy batts is still <$125 and pretty reasonable if they last more than a couple hours. 

 

So hurry up and test them Mike!  Just keep a fire extinguisher close by...

 

Haha!   I'm guessing FlySweep has a fire extinguisher AND a Haz-Mat suit!  So he's going to test these for us!  Go FlySweep!   LOL!

 

But yeah, it's sounding better by the minute.  I might try it eventually myself.  I like your plan of getting two sets of six batteries plus two chargers (holding four batteries each).  That would make everything quite convenient and has me thinking of buying some new pluck foam for the hard case of my "travel rig" so that I can work up a different kit for taking the MG3 on the road. Joy!

 

I received the 6-cell 3600 mA LiPo pack today (25.2V at full charge).  My tools tell me it's a new battery and all the cells are balanced, discharging and charging at the same rates.  Excellent.  I'm putting it through three programmed discharge/charge cycles to get it broken in.

 

I can't wait to compare it with AC power.  Either way, I'm dying to just hear the MG3!

 

It feelth like kwithmuth!  biggrin.gif

post #748 of 2631

I had a quick listen to the Topping TP60 via my newly acquired speaker taps from BTG Audio and my oh my, its made them sing. Just an initial impression from my pc, via USB on the Audio Gd 15.32 DAC and listening to "Doin it right" Daft Punk RAM. I hear improvements across the board but the main things that have improved are: better control and extension in the bass, the mid-range is cleaner sounding and less warm, the highs are clearer. There's just so much more detail now. I heard one instrument (a little cymbal type instrument) much clearer but could I barely picked it out on the Audio Gd 15.32 as a DAC/AMP alone.

post #749 of 2631

Hey Tom,

Quote:
Originally Posted by spurxiii View Post

I had a quick listen to the Topping TP60 via my newly acquired speaker taps from BTG Audio and my oh my, its made them sing. Just an initial impression from my pc, via USB on the Audio Gd 15.32 DAC and listening to "Doin it right" Daft Punk RAM. I hear improvements across the board but the main things that have improved are: better control and extension in the bass, the mid-range is cleaner sounding and less warm, the highs are clearer. There's just so much more detail now. I heard one instrument (a little cymbal type instrument) much clearer but could I barely picked it out on the Audio Gd 15.32 as a DAC/AMP alone.

 

Thanks for describing your source - I didn't know you had that Audio-gd.  I'll remind everyone that you're using HE-500, right?  

 

Apparently, the HE-500 is scaling nicely to all that extra power (approximately 8.4W into 38-Ohm).  Who needs a "proper" headphone amp, eh?

 

Enjoy!

 

Mike

post #750 of 2631
Quote:
Originally Posted by zilch0md View Post

Hey Tom,

Thanks for describing your source - I didn't know you had that Audio-gd.  I'll remind everyone that you're using HE-500, right?  

Apparently, the HE-500 is scaling nicely to all that extra power (approximately 8.4W into 38-Ohm).  Who needs a "proper" headphone amp, eh?

Enjoy!

Mike
Sorry Mike in my excitement I totally forgot about the headphones I was using. Still pretty stoked with this. I still can't believe how much more cleaner sounding the HE500 becomes and the details I pick up now. Can I say for sure that this is close to the best sound I can squeeze out of these babies? I can't imagine much better.
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