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In Reply to: RE: Pioneer made great integrated receivers back in the day... posted by Ivan303 on March 09, 2016 at 20:55:02
i think vintage receivers drive the headphones off the main circuit through some resisters (new receivers may have a separate chip-based amp for headphones).
This probably can make a big diference comparing the old receivers using the powerfull main circuit against the new headphone amps with simpler dedicated chip-based amp (?)
Maybe Ivan could try on his 125watt receiver and tells us about...
Follow Ups:
"i think vintage receivers drive the headphones off the main circuit through some resisters"And that is where the mating of HD 800s to the Pioneer may come adrift from the ideal.
HD 800s are 300 ohm cans. So they deally need to be plugged into an output with an impedence that is <30ohms ( using the 10:1 rule of thumb). However the resistor network that is used to reduce the amplifier output to suit headphones may mean that the 'phones "see" a comparatively high impedence that is unsuitable from a perfectionist viewpoint.
Headpones were generally not considered as truly high end audio devices at the time of your receiver's manufacture ( certainly nothing of the standard of the HD 800s existed) and using an attenuation network would probably have been considered as adequate for the task ( but no more) by the manufacturer. Hence one reason for the creation of a market for outboard headphone amplifiers in later years when the potential quality of headphone listening improved.
Still, suck it and see.
Edits: 03/11/16
Hi !
very interesting point here
" HD 800s are 300 ohm cans. So they deally need to be plugged into an output with an impedence that is <30ohms ( using the 10:1 rule of thumb). However the resistor network that is used to reduce the amplifier output to suit headphones may mean that the 'phones "see" a comparatively high impedence that is unsuitable from a perfectionist viewpoint "
I have seen from a schematic that the Pioneer sx1050 headphone outs are obtained from the speakers out adding in series a 150 ohm resistor (one per channel).
So maybe the big bass perceived is just an underdamped bass ? bloated ?
Just asking.
Kind regards,
bg
Problem solved !
Sennheiser HDVD 800
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