Hattor Audio’s Mini Passive-Active Pre gives you the biggest bang for your investment. The chief difference between the Mini Passive-Active Pre, and The Big Ultimate passive pre, is that The Big Ultimate uses two mono attenuators, and the Mini Passive-Active has one stereo attenuator. Otherwise, they use the same quality components, and receive the same attention to detail.
The unit is available as a regular passive preamp, or with a high performance OPAMP buffer. The buffer is virtually inaudible in this application, and allows the Mini to drive very difficult loads with ease. So, if you plan on driving multiple transistor amps (for instance), the Active version of the preamp will prevent the kind of lackluster dynamic range and poor frequency response often encountered with a passive preamp. When equipped with the active feature, you can switch with remote between active/passive, and choose with the same remote between 3/6/9dB of gain.