I'm not a fan of passive preamps. I've tried several, and they all failed to impress me for the same reasons that several others have posted. This, inspite of having proper impedence characteristics to suggest that the source would have no problems driving the amp and cables. I even tried the Portal Panache, which is designed with a passive pre of sorts and short signal runs...and it sounded much the same as the other passive units, which is to say they sound like Creek gear.
I'll not buy another.
I'll not buy another.