I tried using the headphone output of an AT2020+ USB mic, after powering it using a laptop computer. I recorded to my Tascam DR-60D using a channel of the unbalanced 3.5mm line in. I got a signal but it was unusable. Fortunately I had also taken the 3.5mm mono output of a Crown Sound Grabber II pressure zone mic placed on the table through a custom connector to record on the other 3.5mm channel to the DR-60D. Don't just plug a preamp boosted mic with a mono 3.5mm plug into a stereo 3.5mm jack, or the shorting of a channel could damage your recording device. It came out fine, and had an advantage that it did not over record, since it was recording excited air molecules within an air gap. It also did not record room reverberations, and had a sterile sound, but very articulate. The vibrations from the large table it was on provided good bass response.
Blucoil says:
"The interface also has dual 1/4" TRS main outputs for studio monitors connection."
Maybe that will work if it's an unbalanced consumer level output. The fact that it is TRS concerns me though. It might be -4 dBV balanced output, the ¼" equivalent of a professional XLR connector.
Ideally the output impedance of a device should be one tenth the input impedance of the device you plug it into for the best sound.
A refurbished Golden Age Pre73 Jr. preamp can be bought for under $200 USD. The line output from it could be run through one Aphex 124 like this:
"The balanced XLR inputs have an impedance of 100K ohm. .. The IHF unbalanced -10 dBV rca line outputs have a 150 ohm impedance."
Aphex Model 124A Two Channel Audio Level Interface for Hi-Fi and pro Audio Gear. $79.00 USD
https://www.ebay.com/itm/165884426834?m ... media=COPYThe Aphex interface should work if your blucoil preamp output is balanced -4 dBV. Since it is USB powered, it probably doesn't have enough headroom to get good results from a vocal music performance.
A Tascam DR-60D with a USB power bank and 3.5mm stereo cable would be cheaper and more portable. You don't have to record with it, although it does offer dual recording of 2 tracks at a lower gain in case the pastor gets excited and over records causing clipping. I have used it with modified Golden Age Pre73 MkIII class A preamps with the DR-60D volume low, for a vintage Neve 1073 mixer sound that I like, since I could overdrive it and listen to the vintage 70s color of those Carnhill output transformers.
For Sunday, your Azden SMX-10 mics are your best bet. It would be louder than the MKE600.
I like using my MKE600 on my BMPCC 4K, as it is sensitive enough for the cameras preamp. It is the best supercardioid mic in it's price class.