Preamp w/ Single Line Input. But I have DAC and CDP


My preamp is a vintage MFA LUMI preamp which has a single line input. I've been using that connection for my CDP. However, I just got a Cambridge Audio DAC and it works great using the preamp line stage but I first have to remove the CDP interconnect cables.

What is the most elegant (simple) way for me to have two line inputs so I don't have to keep unplugging IC's?

If it's not apparent by the nature of my question, I am a complete newbie to digital audio.

Thanks in advance.

Paul
ps
Thank you all for the great info and suggestions.

I just determined that the digital output board in the DAC is indeed malfunctioning intermittently. No point in having it repaired. It'd be less expensive to get a basic switching box and use the DAC strictly for iTunes.

Mesch, the Schitt passive pre would be very economical. An excellent suggestion, sir.

Jedi: I just checked out that Niles. Also an excellent option, within my modest budget.

Man, I've learned a lot here about digital (iTunes/computer audio) over the past few days.
Just ordered a SYS from Schiit. It's a passive device which will enable me to switch back and forth between CDP and iTunes. I'll be good to go, in a few days. :)
I have added the Schiit SYS to my audio system today and am happy to report it works flawlessly. Elegant in its simplicity and functionality. Modest in cost. Very fast shipping.

Now switching from USB audio to my CDP is easy and immediate. No more swapping IC cables. :)