Having ran DPAs with both an Aerco (transformer design) and a Lunatec V3 (transformerless design), I would go with a transformerless preamp like the Littlebox (or AETA PSP-3, Sonosax, Lunatec V2/V3, etc). I found the Aerco was just too slow to capture all of the dynamics/info that the DPA's provide. YMMV.