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Old 9th January 2012, 01:05 AM   #11
qusp is offline qusp  Australia
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I thought as much, but thought perhaps dissipation might play a key due to as you say, the lme being capable of peak power of something like 450ma from memory. i was mainly asking out of interest, for my purposes driving tweeters only i cant see me getting close to maxing it out. but it could look pretty cool with a northbridge or GPU fanforced copper heatsink; perhaps i could even make up a novelty 18-16awg cable for my jh13 customs, with an ITC Cannon umbilical connector and try and keep a straight face at the meet haha

Last edited by qusp; 9th January 2012 at 01:09 AM.
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Old 9th January 2012, 01:39 AM   #12
opc is offline opc  Canada
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IanAS:

I think there are two reasons for that:

1. Higher noise - Paralleling more buffers seems to have a negative impact on the noise floor.

2. My setup for that inital parallel test wasn't the best (I simply soldered another buffer in parallel onto the pins of an old BAL-SE headphone amp)

I think both of the above things made for a higher than normal noise floor which made for an actual audible difference in background noise with my IEMs.

To be honest, I still don't suggest running the buffers in parallel unless you really need to. In this case, if you're driving loudspeakers, you really do need the extra current.

If you were to use this for a headphone amp, you would really need to be positive that you actually required the additional current, since I think for headphone use, the normal headphone amp would be better.

Are there examples out there of headphones that really need this much current?

I'm a firm believer that you should always use what you need, and never more. Having more than you need always brings added negative side effects, and by definition never gives you anything in return.

Wolfsin:

Yes, you can populate all 8 of the buffers, or as few as one of them. It purely depends on how much current you need.

Cheers,
Owen

Last edited by opc; 9th January 2012 at 01:41 AM.
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Old 9th January 2012, 01:52 AM   #13
jleaman is offline jleaman  Belgium
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This is a very interesting project i think ill follow and possibly buy parts & boards ( are they for sale ? )
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Old 9th January 2012, 02:29 AM   #14
qusp is offline qusp  Australia
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Owen, yes the head direct HE6, a high end planar magnetic/orthodynamic headphone is pretty popular at the moment and hungry, maybe just out of reach for the bal-bal. people are mostly using low power speaker amps for them. also the old AKG K1000 basically IS a set of speakers strapped rather awkwardly to the head. some old sennheiser headphones were also known to need more.

so yes there could easily be some people that build this to drive headphones, in fact it would be pretty much the perfect amp for them, many are using too much power and thus higher noise amps for the HE6. some are using low power aleph's, F3's one famously silly chipamp is designed for them, that i shall not name
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Old 9th January 2012, 02:30 AM   #15
qusp is offline qusp  Australia
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Quote:
Originally Posted by jleaman View Post
This is a very interesting project i think ill follow and possibly buy parts & boards ( are they for sale ? )
yes, but the format is not yet decided. common man, read the first post, the thread is only 2 pages long
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Old 9th January 2012, 02:39 AM   #16
jleaman is offline jleaman  Belgium
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Originally Posted by qusp View Post
yes, but the format is not yet decided. common man, read the first post, the thread is only 2 pages long
was drooling over pictures and got to excited :O

Will look at buying 4 boards
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Old 9th January 2012, 03:09 AM   #17
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Originally Posted by qusp View Post
it could look pretty cool with a northbridge or GPU fanforced copper heatsink

I was visualising it with one of those cpu coolers with heat pipes wrapping around the pcb and having the heat sink hanging out the back of a speaker enclosure ...
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Old 9th January 2012, 03:22 AM   #18
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another great project. Put me down for 1 set plz!

Last edited by particleman14; 9th January 2012 at 03:26 AM.
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Old 9th January 2012, 03:25 AM   #19
jleaman is offline jleaman  Belgium
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Originally Posted by particleman14 View Post
another great project. Put me down for 1 board plz!
1 board = 1 channel...
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Old 9th January 2012, 07:47 AM   #20
regal is offline regal  United States
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2xpcb only

thanks
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