One solution is to maker a device that uses a simple PLL to convert between Fs and 384*Fs and then provide the appropriate connector circuitry. Jitter wouldn't be too much of a problem because all you're trying to achieve is a rate lock "on the average." FIFO's take care of the finer details.
But anyway, I don't think the AR DAC-2 has clock output. It is also a relatively old DAC. Have you ever tried pairing your 270 with a 27? You could take advantage of the sync capabilty and also might be able to lose the preamp. There are a few 27s for sale now (you would need a minumum of 27i) and resale value stays pretty constant.
Disclaimer, I am a former Wadia engineer and currently consult for them.
But anyway, I don't think the AR DAC-2 has clock output. It is also a relatively old DAC. Have you ever tried pairing your 270 with a 27? You could take advantage of the sync capabilty and also might be able to lose the preamp. There are a few 27s for sale now (you would need a minumum of 27i) and resale value stays pretty constant.
Disclaimer, I am a former Wadia engineer and currently consult for them.