Which portable headphone amps have bass boost

[crimsonadam]

So obviously the new SuperMacro has an optional bass boost function, are there any other brands/models of portable headphone amps that have some sort of bass boost function?

 

[kiwirugby]

If you can lay your hands on one of Xin's SuperDual amps that too has a bass boost. They are not manufactured anymore, but there may be some up for sale.

I have a Macro and thought of selling my SuperDual, but until Xin has finished fine tuning my Macro and I have given it time to burn in, I'm holding on to it.