I've been experimenting with headphone amps and thought I'd see if someone with a higher-end amp would potentially trade for these four: the Topping A30Pro, Schiit Asgard 3, Cavalli Liquid Spark and JDS Labs Atom Amp.

If you are interested, send me a PM and we can exchange photos and details.

They're in great condition. I am the original owner of all of them except for the Asgard 3.

Taking into account taxes, shipping, etc., the total original retail value of the four amps was nearly $1,000.

I'm looking to trade for an amp of similar value. I don't want to trade them individually, but may be willing to trade less than all four if the offer is right.

I have various other items listed on my profile, for those who may want more than just amps.

The A30Pro is mostly the same as the $500 A90, but only has single-ended headphone outputs, with more than twice as much power as the A90's single-ended output. It has outputs for balanced headphone cables, but they are all connected to the same single-ended circuit. It also does not have preamp outputs; only a passthrough.

The Asgard 3 has the phono stage upgrade.

For more info:
https://www.tpdz.net/productinfo/590764.html
https://www.schiit.com/products/asgard
https://www.schiit.com/products/phono-card
https://www.monoprice.com/product?p_id=33304
https://jdslabs.com/product/atom-amp/