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thermal runaway 6th July 2013 10:05 AM

Headphone amp recommendation required?
Have looked around for a suitable amp to suit my requirement but nothing seems to meet it.
I use a Sennheiser HD414 headphone when listening on my laptop but as they are 600 ohm the laptop will just not drive them loud enough.
So, I need a headphone amp that can be driven from the laptop audio out and will match the 414, any idea's?

DUG 6th July 2013 02:25 PM

Use a chip amp (LM3886 or similar) using +/- 30V supplies to get the voltage swing you need.

(Is 1W enough?)

You probably don't need that much heat sinking to drive 600R

My $0.02


thermal runaway 6th July 2013 04:42 PM

Thanks but I'm looking for something to plug and play, just don't have any tinkering time ATM.

jcx 6th July 2013 06:07 PM

are you certain of your year, headphone Z - changes substanially

Sennheiser HD414 - Wikiphonia

thermal runaway 6th July 2013 06:22 PM

They are at least 30 years old and definitely 600 ohms. Even the headphone out on my CD player won't drive them to an acceptable level.

jcx 6th July 2013 06:39 PM

probably not going to find too many portable solutions, not in Li battery/USB power without DC-DC built in - dual 9V batteries would give OK swing but not likely better than a wall powered CD player's headphone out

thermal runaway 6th July 2013 06:46 PM

It's for home use so mains power will be used.

jcx 6th July 2013 07:00 PM

7.5+ W into 8 Ohms would give the Vswing you might want - 600 Ohms only "absorbs" 8/600 of the power, = the headphone 100 mW power rating - actually several times more could be OK for dynamic peaks if that is a continuous power rating for the headphone

so many desk top computer speaker amps, lower power HT amps could at least get loud enough for cheap

although I wouldn't go with switching outputs with your non standard load

DUG 6th July 2013 07:08 PM

Something like this?


Pioneer IS-21MD | Service Manual

Pioneer Stereo Power Amplifier M IS21 | eBay


jcx 6th July 2013 08:32 PM

could be a trifle over power @ 100 W/ch

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