Take this FWIW......My opinion
I ran AKGc1000s>AD-20>M1 & AKGc1000s>hosa Tran>M1
I ran the transformer rig 1st. Bought the AD-20 ran it around 20 shows. Sold the AD-20 & went back to the transformers until i upgraded my mics & got a warm UA-5.
The morel of this ramble is, I liked the sound without the AD-20 better. Of course it's all opinion. Just use it & see.
Jeff~