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Speaker amps for headphones - Page 174

post #2596 of 2891

I’m looking for this box and someone to make it for a while, but I don’t speak Italian (commercial is out of the question as it doesn’t exist).

 

I believe I’m speaking for most, if I say that You could have make a hell of an amount of money of this, yet u put it for free.

 

As for me it is the sign of the deepest love and dedication to the sound. 

 

Thanx Mate

post #2597 of 2891
Making the box actually takes very long, it's rather extensive even though it seems simple.
post #2598 of 2891

Thanks hennessys.

post #2599 of 2891

I just realized the first watt amps (some of them) would do pretty good with many headphones based on their low noise floor  at around -100dBW, 1W into 8 ohm. It seems that spec is unweighted. Anyway, that's 13 dB noisefloor on HE-500 for example, again unweighted. A-weighted, you could likely add somewhere between 5-10dB to the SNR, I think?

post #2600 of 2891
Anyone can advice if the Hd600 will work fine out of speaker amps with an adaptor? Will there be hiss or noise due to its sensitivity?
post #2601 of 2891

I am using my SENN HD800 with dual ART HEADTAP in balance mode - out of the speaker taps of a 15watt per channel AUDIOPAX Stereo88 KT88 tube amp - No hiss. Great sound. There is some hiss with my AT 900 AD but the HD600 should be fine. JD River WIN 8 laptop with either the Centrance M8 or the MsTECH USB 384 dac - Great sound.

post #2602 of 2891
I am using hd800 out of emotiva mini-x and there's a significant amount of hiss, though almost not audible with 12 dB of attenuation from resistors.
post #2603 of 2891

I use HD650s directly fed (no resistors... resistors are futile) from both my Odyssey Cyclops and ancient Nikko integrated amp, with no hiss, excellent sound.

post #2604 of 2891
Quote:
Originally Posted by Gary in MD View Post
 

I use HD650s directly fed (no resistors... resistors are futile) from both my Odyssey Cyclops and ancient Nikko integrated amp, with no hiss, excellent sound.

Looking at amp measurements on some site I don't remember that looks a lot like innerfidelity, it seems amps with a good noise floor is pretty rare, but generally lower wattage equals lower noise floor as I remember. Here at head-fi we still need the ultimate budget speaker amp with low noise floor..

post #2605 of 2891

Gary, how much volume dial movement do you get on the Cyclops when using the HD650?

post #2606 of 2891
Quote:
Originally Posted by davidsh View Post
 

Looking at amp measurements on some site I don't remember that looks a lot like innerfidelity, it seems amps with a good noise floor is pretty rare, but generally lower wattage equals lower noise floor as I remember. Here at head-fi we still need the ultimate budget speaker amp with low noise floor..

It probably has something do with internal impedance of the amp to match with the speaker load.  It will heat up when the load is less impedance as lots of current is rushed though the amp to the load which creates heat.  Heat translates to noise.  For example, 4ohm amps to 4ohms speakers you need a good amp that is capable that don't crap out because it needs to push out lots of current.  Headphones are much greater impedance loads comparatively to the amps impedance.

 

These speaker amps, the headphones stage is used correct?  That means it will have impedance characteristic of the headphone stage.  And the headphone stage will be less wattage.  For example the Pionear vintage of 100Watts, the headphone stage is only 10watts.

 

So in the end the headphone stage is what is being used is fraction of the speaker amplifier.  In essensce you are not really using the full capability of the speaker amp, but the headphone amp section that limits the wattage.  So, it's not necessary or "better" because it's a "speaker amp."


Edited by SilverEars - 7/20/14 at 4:07pm
post #2607 of 2891

Silver, we are not using the 'headphone stage.' This thread is about connecting headphones directly or through a resistor network to a speaker amp's speaker terminals.

post #2608 of 2891
Quote:
Originally Posted by robrob View Post
 

Silver, we are not using the 'headphone stage.' This thread is about connecting headphones directly or through a resistor network to a speaker amp's speaker terminals.

Interesting.  Are you guys getting decent enough range with the knob?  Isn't there a risk of blowing the drivers easily?  I can only imagine this HE-6 or similarly hard to drive cans.  In which scenarios are the resistor network used?

post #2609 of 2891
Quote:
Originally Posted by Gary in MD View Post
 

I use HD650s directly fed (no resistors... resistors are futile) from both my Odyssey Cyclops and ancient Nikko integrated amp, with no hiss, excellent sound.

Do you mean you fed it straight off the taps without any intermediary? Wouldn't the HD650 be sensitive enough such that volume play will be very minimal? Hmm...perhaps i can custom build a pigtail extension for my HD600..may I ask what is the rated output of your Cyclops and Nikko amp? Trying to establish a maximum output rating that can safely be used for a direct tap onto the speaker outs.

 

I recall using the HD650 out of the headphone jack from a vintage Pioneer SX-1280 receiver (with 180W output power) and I could hear a lot of hissing without music being played.

post #2610 of 2891
Quote:
Originally Posted by kelvinwsy View Post
 

I am using my SENN HD800 with dual ART HEADTAP in balance mode - out of the speaker taps of a 15watt per channel AUDIOPAX Stereo88 KT88 tube amp - No hiss. Great sound. There is some hiss with my AT 900 AD but the HD600 should be fine. JD River WIN 8 laptop with either the Centrance M8 or the MsTECH USB 384 dac - Great sound.

Small wattage seems to be more manageable for the more sensitive cans.

 

Quote:
Originally Posted by davidsh View Post

I am using hd800 out of emotiva mini-x and there's a significant amount of hiss, though almost not audible with 12 dB of attenuation from resistors.

Ahh..if it hisses with the HD800, it might hiss with the HD600...should this only be tried with low wattage amps, for example, 20W and below?

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