I'm in the market for a portable amp or passive circuit that will provide crossfeed. If an amp, I would prefer the absolute smallest form factor. I've been listening to a lot of older recordings that would benefit from a crossfeed application.
There is an item in the Headwize Library in an article by Jan Meier call a "bass enhanced crossfeed." It is one paragraph and one schematic.
He says in his article that he did not actually build this circuit...but I did and find it makes harshness disappear or lighten up in some of my amps and does enhance bass and I presume crossfeeds too which is its purpose.
It does not attenuate the signal much through an amp, but it did attenuate the signal from the line out of my Discman.
I mounted the circuit on a piece of perfboard and put it in its own plastic box so I can use it or not with different amps or headphones.
Dr Xin is no longer selling the crossfeed adapter, but he said that he would be redesigning it to make it less fragile, and will re-introduce it at a later time. I imagine that time would be after he finishes with the Reference and gets caught up with production.
The original version was easy to crack the solder traces if much force was put on the headphone plug. I had to repair mine a couple of times. They do, however, work very well.
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